November 22, 2009
Even Pros Can Make Mistakes?
image by Henrik Bondo Fensmark, Denmark
To most observers, Jim Mosher for Chuck Wood
Technical Details
Left: Earth-based photo, 27 Jan 2007 19:12 UT, 5" refractor with 4xPowermate, as seen from Denmark, remapped to an oblique view. Right: computer-generated simulation of the predicted appearance of the Moon viewed in the same geometry, based on the Kaguya global DEM at 16 points per degree. Note that the DEM is expected to generate more relief, especially in the distance, because the Earthbased photo was actually acquired from a more nearly vertical perspective (which flattens the height variations). In the inset, 1770 m is the height of the gray vertical reference bar, and 83.87 km is the length of the horizontal distance reference.
Although LTVT reads out the Kaguya height data to its full resolution, the image at left is helpful for visualizing the numbers. It was also produced with LTVT and is an overhead view of Archimedes as seen in a grayscale version of the Kaguya global DEM. The darker shades are lower, with a pixel intensity of 0 corresponding to -9.14 km and 256 to +10.72 km (the maximum number of steps that can be easily shown on a computer screen), in a linear fashion. The floor is everywhere darker than, and therefore lower than, the surrounding mare according to this instrument. No obvious height (intensity) gradient can be observed across the floor.
Related Links
Note: Chuck should be back posting his LPOD's tomorrow!
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