A
step-by-step example using the Data and Information Access Link (DIAL) system
to digitally process a MISR sample
data file to produce a viewable image.
- Access DIAL
(using a browser or using a link on this CD).
- (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).
- 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.
- On the "grid
information" page, accept the defaults for Image and Map.
- On the same
page, set the (n-1)(Start) SOMBlockDim = 61 and the (n+2)(Stop)
= 64. 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.
- At the bottom of the same
page, select "Histogram equalization."
- 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.
- On the same
page, [Submit]. (You may have to wait a few seconds for results.)
- On the next
page, the buttons allow navigation within the blocks selected.
-
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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