Difference between revisions of "February 13, 2004"
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=Copernicus in Color= | =Copernicus in Color= | ||
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| − | + | <td colspan="2"><div align="center"> | |
| − | + | [[File:LPOD-2004-02-13.jpeg|LPOD-2004-02-13.jpeg]]</div> | |
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| − | + | <td><div align="center" span class="main_sm">Image Credit: [mailto:gaddis@flagmail.wr.usgs.gov Lisa Gaddis], US Geological Survey</div></td> | |
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<table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | <table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | ||
| − | + | <p class="story" align="center"><b>Copernicus in Color </b></p> | |
| − | + | <p class="story" align="left">Robotic spacecraft have made two major contributions to lunar imaging. From the mid-1960s thru the early 1970s, | |
| − | + | high resolution images were obtained by Lunar Orbiter and Apollo spacecraft - this is still the highest | |
| − | + | resolution coverage available for the Moon. During the 1990s, global multi-spectral coverage was acquired by | |
| − | + | Galileo, Clementine and Lunar Prospector. Now, these two types of data are finally being combined. The slowdown | |
| − | + | stems from the fact that the early high resolution images were not digital. But during the last few years the US | |
| − | + | Geological Survey in Flagstaff, AZ has been digitizing Lunar Orbiter images. One dramatic example of the value of | |
| − | + | getting all the data digital is illustrated here. The image on the right is the somewhat standard Clementine | |
| − | + | color composite made with three wavelengths of [../01/LPOD-2004-01-10.htm Copernicus]. In general, red | |
| − | + | colored areas are glass-rich impact melt, and blue is highland (anorthositic) materials. Co-registration of this | |
| − | + | Clementine spectral image with the USGS digitized Lunar Orbiter IV image results in a topographically and | |
| − | + | geologically much more interpretable image (left). For example, the red triangle of impact melt on the floor is | |
| − | + | bounded by the edge of Copernicus' wall. Comparison with higher resolution Orbiter frames shows that the impact | |
| − | + | melt zone exactly matches the smooth surface area of the floor of Copernicus, where the melt drapes over | |
| − | + | underlying terrain. The fact that the impact melt doesn't occur uniformly around Copernicus leads to speculation | |
| − | + | that Copernicus may have resulted from an oblique impact with the projectile coming from the south, southeast. | |
| − | + | And melt on the floor suggest [LPOD-2004-02-04.htm volcanism] has not been important! | |
| − | + | </p> | |
| − | + | <p><b>Technical Details:</b><br> | |
| − | + | Color image made with Red being .750/.415; green .750/.950; and blue .415/.750. The Lunar Orbiter IV frames are 126H2 and 121H2. See first link for details. </p> | |
| − | + | <p class="story"><b>Related Links:</b><br> | |
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[http://www.lpi.usra.edu/meetings/lpsc2004/1791.pdf Becker, Weller, Gaddis et al (2004) <i>Progress in Reviving Lunar Orbiter</i>i]<br> | [http://www.lpi.usra.edu/meetings/lpsc2004/1791.pdf Becker, Weller, Gaddis et al (2004) <i>Progress in Reviving Lunar Orbiter</i>i]<br> | ||
[http://astrogeology.usgs.gov/Projects/LunarOrbiterDigitization/ Lunar Orbiter Digitization Project]</p> | [http://astrogeology.usgs.gov/Projects/LunarOrbiterDigitization/ Lunar Orbiter Digitization Project]</p> | ||
| − | + | <p class="story"> <b>Tomorrow's LPOD:</b> Happy Valentine Dome Day!</p> | |
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| − | + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | |
| − | + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | |
| − | + | <p align="center" class="main_titles"><b>Technical Consultant:</b><br> | |
| − | + | [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | |
| − | + | <p align="center" class="main_titles"><b>A service of:</b><br> | |
| − | + | [http://www.observingthesky.org/ ObservingTheSky.Org]</p> | |
| − | + | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | |
| − | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p></td> | |
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<p> </p> | <p> </p> | ||
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===COMMENTS?=== | ===COMMENTS?=== | ||
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | ||
Revision as of 17:15, 4 January 2015
Copernicus in Color
 |
Image Credit: Lisa Gaddis, US Geological Survey |
|
Copernicus in Color Robotic spacecraft have made two major contributions to lunar imaging. From the mid-1960s thru the early 1970s, high resolution images were obtained by Lunar Orbiter and Apollo spacecraft - this is still the highest resolution coverage available for the Moon. During the 1990s, global multi-spectral coverage was acquired by Galileo, Clementine and Lunar Prospector. Now, these two types of data are finally being combined. The slowdown stems from the fact that the early high resolution images were not digital. But during the last few years the US Geological Survey in Flagstaff, AZ has been digitizing Lunar Orbiter images. One dramatic example of the value of getting all the data digital is illustrated here. The image on the right is the somewhat standard Clementine color composite made with three wavelengths of [../01/LPOD-2004-01-10.htm Copernicus]. In general, red colored areas are glass-rich impact melt, and blue is highland (anorthositic) materials. Co-registration of this Clementine spectral image with the USGS digitized Lunar Orbiter IV image results in a topographically and geologically much more interpretable image (left). For example, the red triangle of impact melt on the floor is bounded by the edge of Copernicus' wall. Comparison with higher resolution Orbiter frames shows that the impact melt zone exactly matches the smooth surface area of the floor of Copernicus, where the melt drapes over underlying terrain. The fact that the impact melt doesn't occur uniformly around Copernicus leads to speculation that Copernicus may have resulted from an oblique impact with the projectile coming from the south, southeast. And melt on the floor suggest [LPOD-2004-02-04.htm volcanism] has not been important! Technical Details: Related Links: Tomorrow's LPOD: Happy Valentine Dome Day! |
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Author & Editor: Technical Consultant: A service of: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
