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Re: map_set, date line problem [message #19500]

Tue, 21 March 2000 00:00

Andy Loughe
Messages: 174
Registered: November 1995

Senior Member

jogi38@my-deja.com wrote:
>
> Dear folks,
>
> I'm a truly beginner with IDL and just encounter a
> problem I can't handle with the manuals I have.
>
> I just tried to plot a map with the longitude
> limits 165 E - 140 W. So I used the eight element
> form of the LIMITS vector and put in the
> coordinates of my edges. What I got is a blank
> picture. If I use the four element vector with
> lonmin, lonmax parameters I ran in the problem
> that lonmax must be -140 and lonmin 165. A
> conversion to 0 - 360 degrees wasn't successful.
>
> So have anybody a solution for the beginner?

Here is one possible solution for a cylindrical projection...

latmin = -90. ; Southern-most latitude
latmax = 90. ; Northern-most latitude
lonleft = 165. ; Lefthand longitude
lonrght = -140. + 360. ; Righthand longitude
lat_center = .5*(latmin + latmax) ; Center latitude
lon_center = .5*(lonleft + lonrght) ; Center longitude
map_set,lat_center,lon_center,limit=[latmin,lonleft,latmax,l onrght],/cont,/iso

--------
Andrew F. Loughe email:loughe@fsl.noaa.gov phone:(303)497-6211

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		Re: map_set, date line problem By: Andy Loughe on Tue, 21 March 2000 00:00
		Re: map_set, date line problem By: davidf on Tue, 21 March 2000 00:00

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