| Coyote Graphics Map Projection Software [message #78392] |
Wed, 16 November 2011 14:21 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
I've spent most of my spare time in the past month
or so (when not finding bugs in the IDL 8.1 function
graphics commands) finding and fixing bugs in
the IDL map projection software. There are a
number of them, especially related to using
Map_Grid on map projections created with
Map_Proj_Init. My impression is that the
IDL software developers don't use Map_Proj_Init
much, or some of these bugs would have been
fixed by now.
In any case, I've fixed them, if I could, and
I have updated them to work with other Coyote
Graphics routines. They now work in a device
independent and color-aware way, and can
be added to resizeable graphics windows in
exactly the same way other Coyote Graphics
commands can be added.
You can read more about them here:
http://www.idlcoyote.com/documents/cg_maps.php
As part of my testing procedure for these
commands I have created some new programs
and refurbished others. For example,
cgGeoMap will now take the name of a GeoTiff
file and will automatically display the GeoTiff
image in a resizeable graphics window with
continental outlines and map grid lines,
if requested. I have another program, not
yet released, that will allow you to use my
active contour program on GeoTiff images
and create ROIs that will automatically
calculate the area and perimeter, produce
output for ENVI, etc. I have ideas for
other applications I would like to develop.
One program I have refurbished is the Terminator_Map
program that draws a day/night terminator on a map
projection. A new algorithm is used that better
preserves the map colors in the dark region of the
map.
I expect these map programs are not bug free. But,
I am working on a book about map projections in
IDL, and it was important that I had software that
actually worked. So I developed the software first.
I'm sure as I write about these programs, and use
them in my examples, they will change in both
functionality and quality. You can help in this
effort if you write me with any problems you
experience with them.
I have made numerous changes and additions to
the Coyote Library to support this recent work.
In fact, you will have to update your Coyote Library
programs to run this software. Even if you don't
use map projections, this would be a good time to
update your Coyote Library, as the changes will also
be used in upcoming updates to important
programs.
http://www.idlcoyote.com/programs/zip_files/coyoteprograms.z ip
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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