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June Wang

Geo Staff
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Blog Comments posted by June Wang

  1. Hi Arpita,

    Please read the attached instruction in pdf and let me know if you need more help with the data processing. The source data and the results of Georeference from IGM can be downloaded from the link below. We will keep the link available for one week. Please let me know if you need more time to download them. Thanks,



    Instruction to work with M3 level2 data.pdf

  2. Hi Tarun,
    I just noticed that you are using the Mini-RF MAPCDR data product. And this product has an Oblique Cylindrical projection. I doubt if ENVI can handle the Oblique Cylindrical projection. USGS ISIS3 support the Oblique Cylindrical projection. You can use ISIS's cam2map or map2map functions to reproject the MAPCDR data to other projections, before you further process the data in other GIS software. More information about USGS ISIS tools could be found in the below link. thanks,


  3. Hi Tarun,
    It looks to me you didn't edit the 'ellipse.txt'file as mentioned in the previous post. I have copied the steps below for your reference. Feel free to let me know if you still have problems. Thanks,

    1. Update the map projection files

    - ENVI includes three map projection files related to the definition of datum, ellipse and map projections. First check where ENVI points to the map projection files.
        - Select File > Preference, under User Defined Files Tab, find Map Projection File.
        - If the right blank is empty, ENVI will point to the map projection files saved under the default system folder where ENVI was first installed, e.g.,"C:\Program Files\Exelis\ENVI50\classic\map_proj\" for ENVI 5.0 classic. This path may vary machine by machine. Otherwise, ENVI will point to the map projection files saved in the path as defined in the right blank.
        - Go to the folder where ENVI points to the map projection files. Backup the three files: "datum.txt", "ellipse.txt", and "map_proj.txt" before you make any changes.
        - Update file datum.txt
             - Open datum.txt
             - Add string "D_Moon_2000, GCS_Moon_2000, 0, 0, 0" to the end of the file
             - Save (If you have permission problem to save the file, please copy the file out to another folder. After changing, copy the saved file back to the original folder. If the permission is  still denied, please let your system administrator to update the files.)
        - Update file ellipse.txt
            - Open ellipse.txt
            - Add string "GCS_Moon_2000, 1737400.0, 1737400.0" to the end of the file
            - Save (take care of the permission problem as above)
        - Update file map_proj.txt
            - Open map_proj.txt
            - Add string "31, 1737400.0, 1737400.0, 90.000000, 0.000000, 0., 0., Moon North Polar Stereographic" to the end of the file [This string needs to be changed to the actual projection you needed for your data)
            - Save (take care of the permission problem as above)
        - Restarting ENVI will update the changes in the map projections.

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