Copernicus and Eratosthenes   Leave a comment

This was copied from LDEM 128, a 128 pixel-per-degree 16-bit grayscale file in cylindrical projection of the whole Moon.  560 meg stored as a jpeg2000 file, it expands to 2.12 Gb saved as a TIFF.  The grayscale height values were converted to a relief plot with Mathematica.   There are still some artifacts:  strips of lower resolution in the file.  I reduced the image by 50 percent, so it is 64 pixels per degree, or 473 meters per pixel at the equator.  This has nearly eliminated the artifacts.  Click for the full-size image.

The view from meshlab.  The artifacts are still there, but subdued.  Corrected in proportion.

A little ground truth.  Image captured January, 2010 from a rooftop in Manhattan.

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Posted January 31, 2011 by finkh in Uncategorized

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