| Problems Zooming in on Map Projections? [message #4024] |
Wed, 19 April 1995 00:00 |
rdhunt
Messages: 6
Registered: January 1995
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Junior Member |
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I am having a problem with the MAP_SET function with IDL. What I am trying
to do is create a windows which has 3 sliders and displays an orthographic
map. The sliders adjust the center latitude, center longitude, and altitude
(degrees spread in display). To obtain the effect of zooming in I use the
altitude value with the lat/lon center point to create a limit which I then
pass to MAP_SET as an option. However, as soon as I try to display images
that wrap over the poles the map that comes back has holes (areas which are
not considered to be part of the map). Try this as an example.
IDL> limit=[75.,340.,85.,180.,75.,20.,55.,360.]
IDL> map_set,75,0,0,/ortho,/grid,/continents,limit=limit
I am using IDL 3.6.1a. I called RSI and they sent me a newer version of
MAP_SET (dated 1995/01/05). I tried this and the problem didn't go away.
I called RSI back and they said the problem also exists in IDL 4.0 which
is soon to be released. They will try to fix it for that release but said
there was nothing they could do now.
Has anyone out there written some IDL code which allows you to zoom in on
areas of a map?
Thanks,
Richard D. Hunt
_/_/_/ _/ _/ _/ SANDIA NATIONAL LABORATORIES _/_/_/
_/ _/_/ _/ _/ P.O. Box 5800 _/_/
_/_/_/ _/ _/ _/ _/ Albuquerque, NM 87185-0965 _/_/_/_/_/_/
/ _/ _/_/ _/ Voice: (505)844-3193 _/ _/_/ _/
_/_/_/ _/ _/ _/_/_/_/ Fax: (505)844-5993 _/ _/_/ _/
E-Mail: rdhunt@sandia.gov _/_/_/
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