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map_proj_init [message #53364]

Sat, 07 April 2007 15:09

marit
Messages: 4
Registered: September 1995

Junior Member

Has anyone run into the problem that subsequent calls to map_proj_init
using a GCTP projection interfere with previously defined maps? Here
is an example:

south_proj=MAP_PROJ_INIT('Polar Stereographic' ,/GCTP ,$
semimajor_axis=6378273.0,semiminor_axis=6356889.4,$
center_lon=0,center_lat=-70.0,false_easting=0,false_northing =0)

print,map_proj_forward([0,0],[-90.0,-89.0],map_structure=sou th_proj)
0.0000000 0.0000000
0.0000000 108332.24

north_proj=MAP_PROJ_INIT('Polar Stereographic' ,/GCTP ,$
semimajor_axis=6378273.0,semiminor_axis=6356889.4,$
center_lon=0,center_lat=70.0,false_easting=0,false_northing= 0)

print,map_proj_forward([0,0],[-90.0,-89.0],map_structure=sou th_proj)
0.0000000 -2.0002841e+23
0.0000000 -1.4035070e+09

I haven't yet seen this occur if the second projection is an IDL
projection; however the IDL projections are not usually useful since
they can't be set up like a normal projections with false easting and
false northing and they are mostly spherical not ellipsoidal.

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[Message index]

		map_proj_init By: marit on Sat, 07 April 2007 15:09
		Re: MAP_PROJ_INIT By: David Fanning on Sat, 29 October 2011 11:41
		Re: MAP_PROJ_INIT By: lecacheux.alain on Sat, 29 October 2011 11:10
		Re: MAP_PROJ_INIT By: lecacheux.alain on Sat, 29 October 2011 10:14
		Re: MAP_PROJ_INIT By: David Fanning on Sat, 29 October 2011 09:48
		Re: MAP_PROJ_INIT By: lecacheux.alain on Sat, 29 October 2011 08:27
		Re: MAP_PROJ_INIT By: David Fanning on Sat, 29 October 2011 07:18

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