| Re: AVHRR Image Mapping Problem [message #51979 is a reply to message #51852] |
Sat, 16 December 2006 07:13   |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
Chris Torrence writes:
> 1. Start iMap.
> 2. File->Open, open one of your Africa images
> 3. Double click on the image to bring up property sheet, edit the color
> table to your liking
> 4. Insert->Map continents
> 5. Click on the Map tab on the right, change plot range to lon [-30, +70],
> lat [-45, +45]
> 6. (bonus) Window->Data Manager, open your image data, click on GeoTIFF tags
> node, then click on the GeoTIFF tags property to view the tags.
>
> Everything looks fine to me:
Yes, I agree, it looks a hell of a lot better
than my attempt with iMap yesterday! But I'm not
so sure it's any better than where I started. The
color table you have chosen here masks the problem
a little bit. If you inverse it, you see the problem
more clearly.
This iMap solution did give me a clue to set the
CENTER_LAT keyword to 1, if I use the original
standard parallels of -19 and 21. I like this
better than changing them to -19,9999 and 20.0005
the way I did yesterday.
This gives me more or less what iMap is giving me,
but--again--just not quite right. I find I still have
to tweak the positions of the corner pixels just slightly
to get everything aligned to my satisfaction.
But, a couple of questions about iMap. I don't want
to display the original data. I want to display a
processed image with a particular set of colors
(I think there are 15). So a processed, byte-scaled
image with a particular color table. How would I get
to this point after reading the GeoTiff file into
iMap? Or, would I have to do this in a different way?
I think this is what confused me about iMap yesterday.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
