| Finding map SCALE given latitude. [message #16208] |
Tue, 06 July 1999 00:00 |
Grady Daub
Messages: 22
Registered: June 1999
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Junior Member |
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I'm making orbit plots. There will be 2 plots, one each of the north and
south poles.
MAP_SET,/cont,color=0,-90,0,0,pos=[.1,.75,.9,.90],scale=100e 6
would show you what I mean. (Using a window shaped like a sheet of
paper.)
Is there an easy (or complicated, for that matter) way to determine the
SCALE= factor to set for the plot to include only up to a certain
latitude circle?
What I need is a rectangular box (centered on the pole), about 20
degrees tall and exactly 90 degrees wide (those in latitude). The data
will be plotted in a similar box, below the map plot, with the data
corresponding to the orbit position directly above it.
This all could probably be done with LIMIT= , but, then I'd have to
worry about aspect ratio's. It seems simpler to make a box with
POSITION= , then scale the earth until it shows the +/- 45 degrees
latitude circle at the left/right edges. (top/bottom range doesn't
really matter.)
Have I explained this adequately?
I should really buy D.Fanning's book, but, I don't expect to be using
IDL after July. :-/
-Grady Daub
p.s.- would you believe that my name's not in the spell checker? :-(
(Remove MMER and ZOOKS to reply by e-mail.)
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