| Automatically Register GeoTIFF Images [message #67791] |
Sun, 30 August 2009 22:38 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
I gave an IDL seminar last week, and in the discussion afterward
I had a wonderful idea about how I could write a program that
would automatically open GeoTIFF images and display them
in a georegistered map coordinate system.
The idea was so compelling I basically gave up the last
weekend of the summer to write the damn thing. (I really
have got to get a life!)
Anyway, that's what I did. I don't claim the program,
which translates a GeoTIFF structure obtained from
Query_TIFF or Read_TIFF into a map coordinate object,
works with every GeoTIFF image in the world. It may not
even work with most of them. But it does work with all
of the ones I had nearby while I was writing the program.
That is to say, it appears to work with the GeoTIFF images
I run into in my own work. The program is named GeoCoord.
http://www.dfanning.com/programs/gocoord.pro
If it doesn't work with yours, I'd be happy to have
a look at it and see why not. I'd like this program to
work with as many flavors of GeoTIFF files as possible.
To put the program to use, I've modified both SelectImage
and ImgWin so that when they open GeoTiff image files now,
they can georegister the image when necessary. This is
incredibly useful to me, and I have ideas for how I can
incorporate the same functionality into some netCDF files
I run into at work.
You can read about the programs, and how I use them,
in this article:
http://www.dfanning.com/autogeoreg.html
Naturally, a big idea like this exposes a hell of a lot
of poor thinking and planning, not to mention bugs, in
code that was previously thought to be perfect. :-(
I think in the end, about eight programs got rearranged some.
Most of these were Catalyst Library routines (since the map
coordinate object lives here), and the one Coyote Library
routine, SelectImage, now has a Catalyst Library dependency,
so it more properly belongs in the Catalyst Library pile.
I haven't moved it yet, but I probably will.
Or, I might just move the Catalyst Library under the auspices
of the Coyote Library. Nearly everything I write lately uses
it, so why am I fighting so hard to keep it separate?
But, there is a list at the end of the article described above
if you want to get yourself up to speed with new programs, etc.
Basically, if you haven't updated your Coyote and Catalyst Libraries
in a while, now would be a good time to do it. :-)
http://www.dfanning.com/catalyst/howtoinstall.html
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.")
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