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Unmanned Spaceflight.com _ Image Processing Techniques _ Deconvoluting to a DEM

Posted by: Juramike May 18 2010, 02:30 PM

I wanted to see if it would be easy to create a "pure" elevation model starting with an already-created brightness overlay on an elevation model.

I tried it with a Venus global image at 180 degrees, using PIA00159 as the combined brightness/elevation model and trying to remove the RADAR-brightness part which I got from PIA00104 (after converting to black and white to match PIA00478). It ain't perfect, but it is a start.

Here is the flow:

Resultant full-res Venus derived colorized DEM is here: http://www.flickr.com/photos/31678681@N07/4618186455/

Posted by: 4th rock from the sun May 18 2010, 05:05 PM

Interesting processing, but the global altimetry for Venus is already http://evildrganymede.net/art/planets/maps/venus-topo.gif, for example.

Anyway, if you work with the color as elevation images in HSB mode you might be able to isolate the elevation data from the fine shadings.

Posted by: JohnVV May 19 2010, 09:00 PM

and here
http://pds-geosciences.wustl.edu/geo/mgn-v-gxdr-v1/mg_3002/gtdr/
there also is a normal map ( old and needs some work/help)
http://celestiamotherlode.net/catalog/show_addon_details.php?addon_id=1072

if you want i can post the 16 bit image i made
i inpainted missing data and filled in with other radar info

there is one big glaring error but most will not be able to see it

some fractures are mapped as ridges ( an oops)

Posted by: Juramike May 19 2010, 10:07 PM

Thanks, y'all. My original intent was making a decolorized version of the RADAR-brightness PIA00104 for an outreach presentation. But then, I got sidetracked into wondering the RADAR-brightness only image could be used to convert into a colorized DEM.

I don't have an exact application in mind yet, although it might be kinda fun to try and convert something like http://photojournal.jpl.nasa.gov/catalog/PIA11831 (Hotei Arcus) or http://photojournal.jpl.nasa.gov/catalog/PIA11829 (Belet-Senkyo region) into a pure DEM.