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Extracting coordinates from CTX observations
Habukaz
post Apr 22 2016, 07:54 PM
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I've been searching a bit, but I haven't found anything: is there a quick method to get the geographic coordinates of any given point within a CTX observation?

I note that the right-click option "Copy Coordinates" in HiView gives the geographic coordinates for HiRISE images when drag-and-drop is used (as opposed to JPEG2000 downloads, when it just gives the pixel coordinates). Is there a way to use the drag-and-drop method for CTX imagery as well, perhaps?

The reason I am asking is that some HiWish targets are a bit tricky to place with visual guidance only.


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JohnVV
post Apr 22 2016, 08:47 PM
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ingest the CTX pds image into ISIS3 , then run spiceint on the image
then view in Qview or in QGis ( ArcGis can too but it is VERY EXPENSIVE )

every pixel will be Geo-referanced

example:
http://viewer.mars.asu.edu/planetview/inst...01S078W&T=2
the pds img ( 197.5 MiB)
http://pds-imaging.jpl.nasa.gov/data/mro/m..._XN_01S078W.IMG

and the HiRISE in the ctx image
http://www.uahirise.org/ESP_038602_1770
the parts
http://hirise-pds.lpl.arizona.edu/PDS/EDR/...SP_038602_1770/
( needs a 10 to 15 gig of drive space for the working directory to assemble and calibrate the 18 RED parts - hirise images are BIG )



mroctx2isis
CODE
mroctx2isis from=P18_008234_1782_XN_01S078W.IMG to=P18_008234_1782_XN_01S078W.cub

spiceinit from=P18_008234_1782_XN_01S078W.cub

ctxcal from=P18_008234_1782_XN_01S078W.cub to=P18_008234_1782_XN_01S078W.Cal.cub



now there is a georeferenced image ( unmapped )

this one is near enough to the Equator
the default "sinusoidal" will do
( both the CTX and the HiRISE image MUST!!! use the same map file )

CODE
cam2map from=P18_008234_1782_XN_01S078W.Cal.cub to=P18_008234_1782_XN_01S078W.Cal.Map.cub



once the CTX and hirise are mapped to the same map file
you can then use "mapmos" to insert it into the ctx
or make a control network and use that

a 1/10 reduced size CTX image of the above example
( the hirise in the above will take a bit of time ( a few hours) even with my Automated script )

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Habukaz
post Apr 23 2016, 08:56 AM
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Thanks. If there is no other way, I guess I'll look into it. (the UNIX requirement of ISIS 3 is inconvenient)


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