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Re: GeoTiff- grid [message #58268 is a reply to message #58167]

Tue, 22 January 2008 15:31

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Well, I tell you what. Here are the numbers I get when I use a
LAT=20 and LON=-96.5:

Corner Coordinates:
Upper Left: (-167346.019, 3677892.560)
Lower Left: (-167346.019, 2982923.485)
Upper Right: (1222592.132, 3677892.560)
Lower Right: (1222592.132, 2982923.485)
Corners in Lon/Lat
Upper Left: (-98.555, 51.338)
Lower Right: (-82.367, 45.408)

Here are the values I get (surprisingly close to
ENVI's) when I use a LON of 2, instead of 20:

Corner Coordinates:
Upper Left: (-167346.019, 3677892.560)
Lower Left: (-167346.019, 2982923.485)
Upper Right: (1222592.132, 3677892.560)
Lower Right: (1222592.132, 2982923.485)
Corners in Lon/Lat
Upper Left: (-98.037, 33.346)
Lower Right: (-85.323, 27.832)

Are you sure you did the ENVI numbers correctly?

Here is the way I set up the map projection:

map = MAP_PROJ_INIT(9, $
DATUM=5, $
CENTER_LAT=20.0, $
CENTER_LON=-96.5)
lonlat = MAP_PROJ_INVERSE([xorigin, xend],[yend, yorigin], $
MAP_STRUCTURE=map)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		GeoTiff- grid By: robinson.inj on Mon, 21 January 2008 13:59
		Re: GeoTiff- grid By: David Fanning on Wed, 23 January 2008 11:00
		Re: GeoTiff- grid By: robinson.inj on Wed, 23 January 2008 23:35
		Re: GeoTiff- grid By: robinson.inj on Wed, 23 January 2008 10:52
		Re: GeoTiff- grid By: David Fanning on Wed, 23 January 2008 07:49
		Re: GeoTiff- grid By: David Fanning on Wed, 23 January 2008 07:29
		Re: GeoTiff- grid By: robinson.inj on Wed, 23 January 2008 07:15
		Re: GeoTiff- grid By: robinson.inj on Wed, 23 January 2008 05:08
		Re: GeoTiff- grid By: David Fanning on Tue, 22 January 2008 15:31
		Re: GeoTiff- grid By: David Fanning on Tue, 22 January 2008 15:17
		Re: GeoTiff- grid By: robinson.inj on Tue, 22 January 2008 15:01
		Re: GeoTiff- grid By: David Fanning on Thu, 24 January 2008 06:48
		Re: GeoTiff- grid By: robinson.inj on Thu, 24 January 2008 06:29
		Re: GeoTiff- grid By: David Fanning on Thu, 24 January 2008 05:40

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