| Re: Map_set & Plots [message #2422] |
Mon, 04 July 1994 14:39 |
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HADFIELD[1]
Messages: 9
Registered: March 1994
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Junior Member |
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In article <Cs6HMs.Axx@ra.nrl.navy.mil> nicholas@dsuap1 (Andy Nicholas) writes:
> I am trying to use map_set to plot the ground-track of a spacecraft and use
> plots to draw a line from the ground track in the line-of-sight (los)
> direction. I can plot the points fine, but cannot seem to get them all to
> connect. Here is my attempt:
> ...
> This only works on about half of the points. Only the points that are East of
> Greenwich are plotted, and nothing west. Anyone have any suggestions?
IDL User's Manual 3.5 p 19-16 says "... lines with length exceeding a certain
value will not be drawn. The critical value depends on the projection.
Problems with drawing lines may occur when lengths exceed 75% of the length or
width of the map. In that case, simply break the line into shorter line
segments."
It's not clear why this would lead to points E but not W of Greenwich being
plotted, but anyway, try adding some intermediate points.
============================================================ ===========
Mark Hadfield hadfield@greta.niwa.cri.nz
NIWA Marine (Taihoro Nukurangi) NIWA.GRETA:HADFIELD
Wellington, New Zealand
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