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A step-by-step example using DIAL to digitally process a MISR sample data file to produce a viewable image.
  1. Access DIAL (using a browser or using a link on this CD).
  2. (optional) Select the "view" option for the MISR AN or CF data file (ONLY if access is via a directory)(a direct link bypasses this step).
  3. At the bottom of the "Scientific Data Browser -- HDF-EOS Data File" page, click on the spectral band of the grid data that you want to view. AN data is all 275-m resolution (spatial sampling), and is big. CF data is 275-m resolution for the red band and 1 km resolution for the others. Selection of a 275-m band means that the image is larger but that one has to wait a few seconds after a submit before results are shown.
  4. On the "grid information" page, accept the defaults for Image and Map.
  5. On the same page, set the (n-1)(Start) SOMBlockDim = 53 and the (n+2)(Stop) = 56. These values are the limits of the subset, not of a full granule, but could be used to find this location in the full granule.
  6. At the bottom of the same page, select "Histogram equalization."
  7. On the same page, select Palette, to produce a false color image from the digital data:
    • The Palette option Rainbow256 is a good general color lookup table.
    • CCAP80 makes obvious the cloud & haze structure, but not the land features.
    • For the red band of the CF file, use OCTS256 to show the smoke and haze.
    • For the red band, GVI256 and GVI175 show the details of the Snake River Plain but not the mountains.
  8. On the same page, [Submit]. (You may have to wait a few seconds for results.)
  9. On the next page, the buttons allow navigation within the blocks selected.
  10. To see a different spectral band, start over at #3. To see the results of using a different palette, start over at #7.

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