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Hi, I've come across many workshop presentation papers and research papers in which the processing of CRISM images include 'Spectral Smile Removal' and the entire sequence of Empirical Processing. 1. When we download the TRR3 data, is it already taken care of? Or do we have to follow a certain algorithm to manually apply it? Can you please suggest me how to do it? It is not mentioned in any workshop papers. 2. If we have to manually perform this task, do we have to do it via IDL/MATLAB programming or is it possible to do so in a GUI software (viz CAT, ENVI)? Thank You! Sourabh Shubham Department Of Geology and Geophysics IIT Kharagpur

I wonder if anyone would have a good book recommendation for getting stuck into ENVI+IDL coding with a focus on this type of data? Has anyone self taught with a particularly useful book?

Hello, I notice that when I use the CAT 7.2.1 - Map Utilities - Project Single Cube Data tool, I obtain a different result than when I use the Build GLT tool in ENVI, with: X Geometry band = Band 5 of the associated DDR Y Geometry band = Band 4 of the associated DDR according to the instructions here on slide 23. http://crism.jhuapl.edu/data/CRISM_workshop_2009/docs/agenda/CRISM_Workshop_090322_Nili_Fossae_Walkthrough_FPS.pdf Looking at the IDL projection_event.pro, I see that the lat and lon keywords are defined as follows: ; Pull some planes from the geofile lat = envi_get_data(fid=geofid,dims=dims,pos=3) lon = envi_get_data(fid=geofid,dims=dims,pos=4) Should this be bands 4 and 5 (as in the walkthrough slides) rather than 3 and 4? The filename I am using is: /home/Raw/frt00003e12_07_if166l_trr3_CAT_corr_SUM_classified_noProj.img I know in find_geofile.pro that an automatic search is done for the ddr associated with the default trr3 name, but I'm not sure if it would find the ddr associated with mine as the filename has been altered from the standard CAT convention. Essentially I am wondering which projection method is more correct. Regards, Elyse

Hi all, Does anyone know how to extract the ground track coordinates from the .dat file and save it seperately in e.g. a .txt file? I've opened the file in NASAview and know it's column 76, 77 & 78 that contains the groundtrack. Normally I'd just use Matlab, but the .dat file is too large for Matlab to handle. I've tried to load & save the columns using e.g. readcol and ddread in IDL but for some reason I do not get the desired output. Does anyone know of another IDL function that can achieve this?