Ralph Vidal
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Posts posted by Ralph Vidal
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Hi Feng,
the geo-referencing works now , I did the images co-registering as you explained. The reprojected image is on the right place, but it seems to have an issue with the bands : usually the false color RGB should be bands 199, 354 and 419. It shows strange results though ( image is red ,see pics )
thanks
Ralph
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Hi Feng,
thanks, I copied the files to the envi directory. The error message is gone. Anyway the images still do not fit.
1) CTX image:
2) CRISM image ( unprojected) : frt0000a5aa_07_if166l_trr3
http://themis-data.asu.edu/viewer/crism#P=FRT0000A5AA_07_IF166L_TRR3&T=2 ( all links to download to ddr1 and img files on the page )
Could the problem lie with the CTX image projection settings ?
Thanks
Ralph
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Hi guys,
I am using the CAT tool (latest version, 4/8/20) to map project crism data, I am not getting it right, when I overlay the projected data on a CTX image they do not quite fit. When projecting the crism tr3 image using CAT I get error message shown in the first picture.
The CAT instruction at https://astropedia.astrogeology.usgs.gov/download/Docs/PlanetaryDataWorkshop/Presentations2017/Monday/Humphreys/Morgan_CATupdates.pdf tells that "
QuoteCustom spheres, datum, and reference system definitions must be correctly installed
Where do I get those definitions ? Is there some .proj file I have to put into the envi folder/ CAT folder ?
The third picture shows the swipe made with a crism image overlain on the CTX image. Latitude seems to fit, longitude does not..
Thanks
Ralph
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Hi,
I read in a CRISM doc that following:
QuoteFor most band depth and similar measures of absorption,
- Zero is the minimum realistic value
- The 99th percentile is typically a good maximum, although there is a empirically-determined “minimum maximum” that varies by parameter (e.g., 0.02 for D2300)
Is there a table/document where such minimum/maximum values can be found, or is it image dependent and has to be found individually each time ?
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Hi Ray,
yes, I got the CAT 7.4 from your website and installed it on ENVI 5.5.3 ( CAT does not appear on the menu when using envi classic, but it does not matter, as I am not using the classic gui ). I am working with the S data because there is not enough L data for this crater . Where L data is available , I will use it , otherwise I have use the S data . It seems the CAT tool would only identify ferric phases, that is why I am trying to use ENVI's spectral angle mapping tool with the "rocks.sli" library.
The CRISM data files I get from http://themis-data.asu.edu/ ( for example http://themis-data.asu.edu/viewer/crism#P=FRT0000A5AA_07_IF166L_TRR3&T=2 ) - not the processed ones , but the ones with the link on the page ( ddr1, lbl, .img etc)
Ralph
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Hi Ray,
I finally managed to install ENVI 5.5.3 on my computer. As I wrote before , I intend to use VNIR crism data with the "rocks.sli" spectral library.
The first picture ( crism VNIR images overlain on CTX mosaic ) shows the area I want to process .
The second pic shows the results using SAM with Bandmax ( threshold of 0.05) applied to one of the VNIR images. Does it make sense ( using only VNIR data with CRISM's "rocks.sli" library ) ?
Thanks
Ralph
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Hi,
I am working with CRISM data on the McLaughlin Crater . I have downloaded following IR dataset images
- FRT0000CB488_07_IF166L_TRR3
- FRT000139F7_07_IF166L_TRR3
- FRT000247A0_07_IF166L_TRR3
- HRS00006AC4_07_IF175L_TRR3
- FRS00029E22_01_IF168L_TRR3
- FRS0002B4DA_01_IF168L_TRR3
- FRS0002C9DC_01_IF168L_TRR3
- FRS0002DB50_01_IF168L_TRR3
- FRS0002EF79_01_IF168L_TRR3
- FRS0002FF3C_01_IF168L_TRR3
- FRS0003134A_01_IF168L_TRR3
- FRS00035729_01_IF168L_TRR3
- FRS0003640C_01_IF168L_TRR3
- FRS0003705A_01_IF168L_TRR3
- FRT00009CAE_07_IF166L_TRR3
- FRT0000A27C_07_IF166L_TRR3
- FRT0000A5AA_07_IF166L_TRR3
- FRT0000C42E_07_IF166L_TRR3
- FRT0000C6AF_07_IF166L_TRR3
as well as those VNIR images:
- hsv0001bf65_01_if209s_trr3
- hsv0001e87c_01_if209s_trr3
- hsv0002e57c_01_if209s_trr3
- hsv0003f9e0_01_if209s_trr3
- hsv00043b25_07_if209s_trr3
- hsv000293cf_01_if209s_trr3
- hsv000412d4_03_if209s_trr3
- hsv000478c2_03_if209s_trr3
- hsv0002003a_01_if209s_trr3
- hsv0002246d_03_if209s_trr3
- hsv0003793e_01_if209s_trr3
What would be the steps needed to process those images? As far as I understood I need to
1) Convert PDS to CAT ( is it needed ? ) before loading image into Envi
1) ATM correction ( for VNIR images only photometric correction)
2) CIRRUS ( despike + destripe)
3) MRO CRISM remove stripes
4) Flatten summary products ( what does it do ? is it necessary ? )
5) Apply crism bad band list
Are the above steps correct/enough/in the correct order , and is there a script ( IDL whatever ) to process thos images as a batch task ?I am doing a geological map of the McLaughlin crater, using crism's "rock.sli" spectral library to map the geological units. Can this library be used with VNIR data, or only with IR data ?
Thanks
Ralph Vidal
CRISM : CAT map projection
in For data users
Posted
hi Feng,
I managed to correct the image as you explained. But when I set the ignore value to 65535 it seems to keep a black stripe on one side that I cannot get rid of ( see attachments ) . When I set the ignore value to 0, the black stripe disappears but a white background appears. There is some kind of white line around the picture too. Do you maybe have any hints how to fix this ?
Thanks
Ralph