Jump to content
PDS Geosciences Node Community


  • Content Count

  • Joined

  • Last visited

About Feng

  • Rank

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Hi Wladimir, Would you please provide the scenes you worked on so that we can better go through from there? Thanks, Feng
  2. hi Wladimir, I think the only difference between yours and mine is the data ignore value. Since you cannot change -1 to 65535. How about you directly open the .hdr file in NotePad and change -1 to 65535 then save the file? You need close the .img in ENVI otherwise, you are unable to save the .hdr file. Thanks, Feng
  3. Hi Wladimir, I processed the same data as you did and there is no problem at all (the black img_1 and img_2). Would you please redo it? For your additional question, the answer from the team scientist is: The user will need to look at both the product type and data type to figure out the state of the data – and there are also keywords in the label that indicate the corrections that have been applied. A quick summary – IF TRR3 – top-of-atmosphere apparent spectral reflectance (no corrections) AL TRR3 – surface spectral lambert albedo (photometric and atmospheric corrected via RT modeling) IF TER3 – top-of-atmosphere corrected I/F – CAT-like PHT and ATM corrections (and some other steps) have been applied IF MTR3 – map projected version of the corresponding TER For these correction, you can use the ATP correction function in CAT. Thanks, Feng
  4. Hi Wladimir, The CAT_WAVELENGTH_FILTER in the header files is a numeric code from PDS label (in PDS3 label: "MRO WAVELENGTH_FILTER"). It is used when reading original CRISM data into CAT. When parsing PDS label, the default wavelength array to apply to the data (i.e., the standard re-sampling wavelengths for the appropriate wavelength filter used for the observation). It is most likely a book-keeping value. Thanks, Feng
  5. Hi Wladimir, Your adjustment of the x and y in img_2 is correct. This is also what I did to ignore the non-data or bad bands. The number 65535 is also assigned to the bad bands. That's why you see the two straight lines between 2.5 to 3.0 um. For the problem you mentioned in img_3, you can do the following step to make it work: 1, Add wavelength through Edit ENVI header 2, edit the wavelength of your selected band, for example for D2300: tyep in 2.300 then hit Enter, it will update D2300 wavelength 3, after update wavelength of your selected bands, plot the spectral profile, and change the X range: Please let me know if you have other questions. Thanks, Feng
  6. Hi Wladimir, For your first question, the trr3 is not map projected. So you will see the rectangle instead of the ones you saw on the paper. To map project the trr3, you can use the CAT map projection function. Or you can download the corresponding MTRDR (which is map projected TRDR) if it is available. I don't understand " additionally it opens inverted so i have to apply a 180° rotation. ". I think the original one is correct and you don't need rotate 180 degree. For your second question, the band 1 with value of 65535 is the non-data band. There are other bands which is bad band, these bad band data can not be used. For the bad band list you shall ignore these bands. For example, the following screenshot shows a symbol before the bad bands: Please let me know if you have any other questions. Thanks, Feng
  7. CAT 7.4 is now available. User can download the latest version through: http://pds-geosciences.wustl.edu/missions/mro/crism.htm
  8. Hi Harish, It is about the permission. Would you please run the IDL with "Run as Administrator" then run the previous SAVE command again? Please let me know if you still have problem. Thanks, Feng
  9. Hi Chandan, It seems the customized datum is not recognized by ENVI. Would you please check if the three map projection files are in the right place? According to CAT installation document: Set up CRISM Customized Map Projection Move the CRISM customized map projection definitions files (datum.txt, geogcs.txt, spheroid.txt) from the CAT_ENVI\aux_files\crism_projection\ folder to your ENVI installed path inside the idl8x\resource\pedata\user_defined\ folder (the location of user_defined folder may vary based on your ENVI version, idl8x: idl86 for ENVI 5.3 and 5.4; idl87 for ENVI 5.5). If there files are not in the right place, please copy them to related folder and then start ENVI+IDL again. Thanks, Feng
  10. Hi Emran, There is no problem for the map context and CAT projected TRR3 image. The map context is coming from DDR which contains all lines including the key area and lines before it reaches key area. CAT map projection removes the lines before key area. If you run map projection in ENVI (on standard 5.4: Geometric Correction -> Georeference IGM), you can see all lines as following: But the lines CAT excludes is not useful and that's why CAT projection cuts these lines. Also please note: this is typical for the FRS and ATO data. Hope this answer your questions. Thanks, Feng
  11. Hi Emran, This is Feng. I am going to look into this. Have two questions: are you using ENVI 5.4 standard (not classic version)? Do you copy the three map projections files inside \CAT_ENVI\aux_files\crism_projection folder to your ENVi IDL folder (like C:\Program Files\Harris\ENVI54\IDL86\resource\pedata\user_defined folder)? Thanks, Feng
  12. Hi Emran, The image cube product after ATP correction (...._trr3_CAT_corr.img) has all original bands (438 which include 8 bad bands, you can see it through Data Manager in ENVI 5.4 ) When you project the image cube, these bad bands are removed, so there are 430 bands left. Can you do the spectral enhancement before map projection then projection the output afterwards? Thanks, Feng
  13. Hello Emran, Do you mean which file I used in the instruction? I use frt000047a3_07_if166l_trr3_corr_p_2014params_flat.img Thanks, Feng
  14. Hi Emran, Would you please check attached file which describes the processing steps? Please let me know if you have any questions regarding to these steps. Thanks, Feng Steps.pdf
  15. Hi Emran, I did replicate the error in classical ENVI. I will fix this problem. Meanwhile would you please use the recent ENVI CAT? Thanks, Feng
  • Create New...