| map_set - 8-element limit [message #12427] |
Tue, 28 July 1998 00:00  |
wmc
Messages: 117
Registered: February 1995
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Senior Member |
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Hello group...
I'm having trouble (idl 5.1; alpha) with map_set limits for 8-element
vectors.
map_set,lim=[-65,-180, -65,-90, -65,0, -65,90],/grid,/cont,/iso,/ster,-90
ought to work (all pts along 65 S, regularly spaced in longitude)
since its a perfectly good square in physical space coordinates.
But it doesn't - I get just a single horizontal line and a divide-by-zero.
I had a quick look at map_set and
just got more confused - it appears to do some convert_coord stuff to work
out what limits to use - but how can it do this *before* the map xform is
established? Maybe I read it wrong.
Whats up?
- William
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| Re: map_set - 8-element limit [message #12474 is a reply to message #12427] |
Mon, 03 August 1998 00:00  |
wmc
Messages: 117
Registered: February 1995
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Senior Member |
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>> wmc@bas.ac.uk wrote:
>>> map_set,lim=[-65,-180, -65,-90, -65,0, -65,90],/grid,/cont,/iso,/ster,-90
>>>
>>> ought to work (all pts along 65 S, regularly spaced in longitude)
>>> since its a perfectly good square in physical space coordinates.
Apologies for following up my own post, but RSI have told me the truth so
I thought I'd share it.
The problem is that, although my points form a square, the first point isn't
the bottom left corner. If I'd written:
map_set,lim=[-65,-180, -65,-90, -65,0, -65,90],/grid,/cont,/iso,/ster,-90,-90
(making the point (-180,-65) the leftmost point) it would have worked.
Hmmm, well I don't find this a completely satisfactory answer. It seems to me
that map_set should be able to take 4 points and sort out for itself which
one is bottom left, etc. Otherwise you're forced to do this yourself any time
there is any doubt.
- William
William M Connolley | wmc@bas.ac.uk | http://www.nbs.ac.uk/public/icd/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself
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