| Re: Map_set limits [message #10469 is a reply to message #10400] |
Mon, 01 December 1997 00:00   |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Hi Folks,
I have to admit that I am confused about recent postings
from St�phane Erard and Martin Schultz, who complain about
having to fiddle with the Position parameters to get a
Map_Set command to fit the proper Limits around an image.
In a private communication I asked St�phane to send me
an image and part of his code, which he graciously did.
I've been fooling around with it a little in my "spare"
time. (Please don't tell my wife I am doing this. I am
in hot water already.) In truth, I can't reproduce the
problem. But, on the other hand, I am not absolutely
certain that I can recognize the problem either.
If I position an image in the window in such a way
that it takes up, say, 80% of the window space and then
try to position a map projection on it like this:
Map_Set, /Sin, Limits=theLimits, Position=[0.1,0.1,0.9,0.9]
then in IDL 5 it seems to do this *exactly*. That is to
say, the Map_Set axes are coincident with the edges of
the image. If I now lay a grid on the image, then the
grid *appears* to go exactly where I want it.
What I am unsure about is if the grid is going *exactly*
where it is suppose to go. How would I know? You folks
presumable have some kind of ground point or something
that you know the exact latitude and longitude coordinate
of. If I do the same thing with a data set I am more
familiar with (say, the worldelv.dat data set in IDL), then
it still appears to do the right thing.
In any case, I am all ears. :-)
Cheers,
David
P.S. With respect to Martin's problems with images and
PostScript, I find I always use TVImage (available on
my web page) for positioning images in windows. You can
use the Position keyword with it like you do for a contour
or line plot. The advantage of this is that the routine is
Device independent. It works the same way in PostScript
as it does on the display.
-----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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