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PDS Geosciences Node Community
  1. PDS Geosciences Node

    1. Announcements

      The latest news from the Geosciences Node

      227
      posts
    2. For data providers

      Discussions pertaining to preparing data for archiving with PDS

      8
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    3. For data users

      Questions and comments related to locating, accessing, and using PDS Geo data

      472
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  2. PDS Geo Tools

    1. Analyst's Notebook

      Posts relating to the Analyst's Notebook

      69
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    2. ODE - Orbital Data Explorer

      Posts related to the Orbital Data Explorer

      443
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    3. 4
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    4. Spectral Library

      Posts relating to the PDS Geosciences Node Spectral Library

      9
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  3. Workshops

    1. MRO/CRISM Data Users' Workshop 2012

      Posts relating to the 2012 MRO/CRISM Data Users' Workshop.

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  • Recent Topics

    • We are pleased to announce that the USGS Unified Geologic Map of the Moon is now available through the Lunar ODE map search. The map is displayed as two map layers in ODE. 1. The first layer contains unit contacts, geologic unit polygons, linear features, and unit and feature nomenclature annotation. 2. The second layer, which we call the base layer is a shaded-relief product derived from SELENE Kaguya terrain camera stereo (equatorial, ~60 m/pix) and LOLA altimetry (north and south polar, 100 m/pix).  
    • The Analyst's Notebook has been updated with data from release 5, containing data from sols 391 to 478 for the InSight lander. https://an.rsl.wustl.edu/ins
    • Jee, 1. Yes. 2. To assign each pixel a latitude and longitude, you will need the information in the IMAGE_MAP_PROJECTION part of the label, and also the file DSMAP.CAT in the CATALOG directory of the archive (or DSMAP_POLAR.CAT if you are working with an image in polar stereographic projection).  DSMAP.CAT is a text file that gives the details of the simple cylindrical map projection, including the equations to go between latitude-longitude and line-sample. The IMAGE_MAP_PROJECTION keywords in the label give you the values to plug in to those equations for that particular image.  3. The data are in 16-bit signed integers because some of the values are negative. Even after applying the scale and offset there will be negative values, representing elevation below the defined planetary radius, as explained in the note in the label.   
    • I think I might have the answer to number 2. I can just use the values for LINES, LINE_SAMPLES and the various LATITUDE/LONGITUDE limits. With these values I can just convert between the two. Correct me if I'm wrong.
    • Hi Ralph, This is caused by ENVI displaying the CRISM 65535 data_ignore_value. The warp image is displaying the big span than the valid data range. To display it correctly, you can modify the histogram stretch. Here are the steps: 1, first check the histogram for three bands value range of the trr3: 2, use "save as" tool under File to output the warped result to specify the data ignore value: 3, then change the output image accordingly: From to: Please let me know if you have any questions. Thanks, Feng  
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