| An IDL Satellite Image Mapping Tool [message #6679] |
Tue, 30 July 1996 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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If you've ever tried to display a large (say 1000x1000 pixel) satellite
image on a base map in IDL, then you've probably been frustrated at the
lack of an easy-to-use tool. I spent many hours playing with
TRIANGULATE, TRIGRID, POLY_2D, and POLYWARP, and never
found a satisfactory way to do it.
In response to a question I posted to the IDL newsgroup, Hermann
Mannstein suggested a solution. First, MAP_SET is used to define a map
projection in the current display window. CONVERT_COORD is then
used to copy pixel values from the input image to the corresponding
location on the map projection. Finally DILATE is used to fill any holes
in the resampled image.
The command is named IMAGEMAP, and the required input is a 2D array of satellite
image values, and corresponding 2D arrays of latitude and longitude for each
pixel. The image is resmapled and displayed in the current graphics window.
I like to use the ESRG routine W8X11 or W11X8 to create a large graphics
window.
Check out http://cimss.ssec.wisc.edu/~gumley/imagemap.html for details,
a link to the IDL source, and some example images.
Cheers,
Liam.
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