https://www2.lpod.org/index.php?title=January_24,_2011&feed=atom&action=historyJanuary 24, 2011 - Revision history2024-03-28T16:34:36ZRevision history for this page on the wikiMediaWiki 1.31.1https://www2.lpod.org/index.php?title=January_24,_2011&diff=43451&oldid=prevApi at 15:28, 28 October 20182018-10-28T15:28:05Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.<del class="diffchange diffchange-inline">wikispaces.com</del>/<del class="diffchange diffchange-inline">January+20</del>,<del class="diffchange diffchange-inline">+2011 </del>LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a comment on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [https://the-moon.us/wiki/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [https://the-moon.us/wiki/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [https://the-moon.us/wiki/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://<ins class="diffchange diffchange-inline">www2.</ins>lpod.<ins class="diffchange diffchange-inline">org/wiki</ins>/<ins class="diffchange diffchange-inline">January_20</ins>,<ins class="diffchange diffchange-inline">_2011 </ins>LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a comment on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [https://the-moon.us/wiki/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [https://the-moon.us/wiki/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [https://the-moon.us/wiki/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td></tr>
</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=43086&oldid=prevRegan at 03:51, 28 October 20182018-10-28T03:51:07Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 03:51, 28 October 2018</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a <del class="diffchange diffchange-inline">[http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798 </del>comment<del class="diffchange diffchange-inline">] </del>on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [https://the-moon.us/wiki/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [https://the-moon.us/wiki/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [https://the-moon.us/wiki/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a comment on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [https://the-moon.us/wiki/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [https://the-moon.us/wiki/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [https://the-moon.us/wiki/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td></tr>
</table>Reganhttps://www2.lpod.org/index.php?title=January_24,_2011&diff=42335&oldid=prevApi at 01:47, 14 October 20182018-10-14T01:47:54Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 01:47, 14 October 2018</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Rükl plate [https://the-moon.us/wiki/R%C3%<del class="diffchange diffchange-inline">BCkl+71 </del>71]<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Rükl plate [https://the-moon.us/wiki/R%C3%<ins class="diffchange diffchange-inline">BCkl_71 </ins>71]<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><p><b>Yesterday's LPOD:</b> [[January 23, 2011|23 Hrs of Stratigraphy]] </p></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><p><b>Yesterday's LPOD:</b> [[January 23, 2011|23 Hrs of Stratigraphy]] </p></div></td></tr>
</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=40489&oldid=prevApi at 02:18, 19 August 20182018-08-19T02:18:46Z<p></p>
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</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l6" >Line 6:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798 comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [<del class="diffchange diffchange-inline">http</del>://the-moon.<del class="diffchange diffchange-inline">wikispaces.com</del>/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [<del class="diffchange diffchange-inline">http</del>://the-moon.<del class="diffchange diffchange-inline">wikispaces.com</del>/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [<del class="diffchange diffchange-inline">http</del>://the-moon.<del class="diffchange diffchange-inline">wikispaces.com</del>/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798 comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [<ins class="diffchange diffchange-inline">https</ins>://the-moon.<ins class="diffchange diffchange-inline">us/wiki</ins>/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [<ins class="diffchange diffchange-inline">https</ins>://the-moon.<ins class="diffchange diffchange-inline">us/wiki</ins>/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [<ins class="diffchange diffchange-inline">https</ins>://the-moon.<ins class="diffchange diffchange-inline">us/wiki</ins>/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Rükl plate [<del class="diffchange diffchange-inline">http</del>://the-moon.<del class="diffchange diffchange-inline">wikispaces.com</del>/R%C3%BCkl+71 71]<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Rükl plate [<ins class="diffchange diffchange-inline">https</ins>://the-moon.<ins class="diffchange diffchange-inline">us/wiki</ins>/R%C3%BCkl+71 71]<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><p><b>Yesterday's LPOD:</b> [[January 23, 2011|23 Hrs of Stratigraphy]] </p></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><p><b>Yesterday's LPOD:</b> [[January 23, 2011|23 Hrs of Stratigraphy]] </p></div></td></tr>
</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=32041&oldid=prevApi at 21:30, 8 February 20152015-02-08T21:30:49Z<p></p>
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</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=27376&oldid=prevApi at 18:51, 7 February 20152015-02-07T18:51:24Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 18:51, 7 February 2015</td>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><p><b>Yesterday's LPOD:</b> [[January 23, 2011|23 Hrs of Stratigraphy]] </p></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><p><b>Tomorrow's LPOD:</b> [[January 25, 2011|Insufficient Evidence]] </p></ins></div></td></tr>
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</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=17415&oldid=prevApi at 00:30, 12 January 20152015-01-12T00:30:11Z<p></p>
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html<del class="diffchange diffchange-inline">" rel="nofollow </del>Kaguya 3D GIS viewer]</em><br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798<del class="diffchange diffchange-inline">" rel="nofollow </del>comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [http://the-moon.wikispaces.com/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [http://the-moon.wikispaces.com/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027<del class="diffchange diffchange-inline">" rel="nofollow </del>book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [http://the-moon.wikispaces.com/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798 comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [http://the-moon.wikispaces.com/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [http://the-moon.wikispaces.com/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [http://the-moon.wikispaces.com/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com<del class="diffchange diffchange-inline">" rel="nofollow </del>Chuck Wood]</em><br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td></tr>
</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=14153&oldid=prevApi at 05:11, 5 January 20152015-01-05T05:11:58Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 05:11, 5 January 2015</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>__NOTOC__</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=How Deep is That Hole? Version 2.0=</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=How Deep is That Hole? Version 2.0=</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!-- ws:start:WikiTextLocalImageRule:6:&lt;img src=&quot;/file/view/Baily_Topo.jpg/195398860/Baily_Topo.jpg&quot; alt=&quot;&quot; title=&quot;&quot; style=&quot;width: 800px;&quot; /&gt; -->[[File:Baily_Topo.jpg|Baily_Topo.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!-- ws:start:WikiTextLocalImageRule:6:&lt;img src=&quot;/file/view/Baily_Topo.jpg/195398860/Baily_Topo.jpg&quot; alt=&quot;&quot; title=&quot;&quot; style=&quot;width: 800px;&quot; /&gt; -->[[File:Baily_Topo.jpg|Baily_Topo.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html<ins class="diffchange diffchange-inline">" rel="nofollow </ins>Kaguya 3D GIS viewer]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798 comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [http://the-moon.wikispaces.com/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [http://the-moon.wikispaces.com/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [http://the-moon.wikispaces.com/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798<ins class="diffchange diffchange-inline">" rel="nofollow </ins>comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [http://the-moon.wikispaces.com/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [http://the-moon.wikispaces.com/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027<ins class="diffchange diffchange-inline">" rel="nofollow </ins>book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [http://the-moon.wikispaces.com/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><em>[mailto:tychocrater@yahoo.com<ins class="diffchange diffchange-inline">" rel="nofollow </ins>Chuck Wood]</em><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td></tr>
</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=9902&oldid=prevApi at 07:09, 3 January 20152015-01-03T07:09:08Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 07:09, 3 January 2015</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=How Deep is That Hole? Version 2.0=</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=How Deep is That Hole? Version 2.0=</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">  </del><!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><em>image from [http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></div></td></tr>
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</table>Apihttps://www2.lpod.org/index.php?title=January_24,_2011&diff=7598&oldid=prevApi at 04:37, 2 January 20152015-01-02T04:37:04Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 04:37, 2 January 2015</td>
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><em>image from [mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><em>image from <ins class="diffchange diffchange-inline">[http://wms.selene.jaxa.jp/3dmoon_e/index_e.html Kaguya 3D GIS viewer]</em><br /></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"><br /></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">I had forgotten how hard it is to determine the depth of a crater. In a recent [http://lpod.wikispaces.com/January+20,+2011 LPOD] I mentioned that there was no reliable measurement of the depth of Bailly. And then in a [http://lpod.wikispaces.com/message/view/January+21%2C+2011/32960798 comment] on the next day's LPOD, Maurice Collins reported that the 3D GIS viewer for Kaguya data had been updated with a new global mosaic made from Kaguya images. I downloaded and installed the viewer client and played with it, and then realized that with the topographic profile tool I could measure the depth of Bailly. For an ideal crater on flat terrain, measuring the height of the rim crest and of the floor, would yield the depth. But like many older craters the rim and floor of Bailly are pretty uneven. With the Kaguya 3D viewer I determined that an approximate elevation for the floor is -1,600 m, and that the rim to the west, near Hausen, is about 4,030 m, giving a depth of 5,630 m. But the rim everywhere else is lower, and for one typical spot on the eastern rim the height is 2,220 m, giving a depth of 3,820 m. So how deep is Bailly? An average of these two is 4,725 m. When US Geological Survey scientist Dick Pike determined crater depths using the Lunar Topographic Maps he measured rim heights at 8 evenly spaced positions and took the average. When I used to measure shadow lengths on Lunar Orbiter photos 40 years ago I usually took the longest one, giving not the average but the maximum depth. There are in fact two measures of [http://the-moon.wikispaces.com/Bailly Bailly's depth] determined by shadow measurements. Cherrington's 1968 [http://the-moon.wikispaces.com/Cherrington book] lists 4.2 km, and in Westfall's [http://www.amazon.com/Atlas-Lunar-Terminator-John-Westfall/dp/0521590027 book] a value is given of 4.1 km. These are reasonably consistent with the 4.7 km derived above, which is, however, deeper than I expected. I encourage visitors to LPOD to try their digital hands at determining crater depths. To decide which ones to measure, simply go to the [http://the-moon.wikispaces.com/Introduction Moon-Wiki] and look at any entry. If there is no depth given, or if there are two or more that disagree substantially, that is your target. Don't forget to add the depth to the Wiki.This would be a very valuable project for farside craters for which almost no depths are known.<br /></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"><br /></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"><em></ins>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><strong>Related Links</strong><br /></div></td></tr>
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