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Re: google earth projections [message #63319 is a reply to message #63180]

Mon, 03 November 2008 08:34

liamgumley
Messages: 74
Registered: June 2005

Member

On Nov 1, 2:20 pm, "R.G. Stockwell" <notha...@noemail.com> wrote:
> Does anyone know the IDL map projection to use to make a
> ground overlay in a kml file (to be viewed by a geobrowser such
> as google earth?)
>
> I've googled and have seen many different things stated,
> so I am not sure if my use of cylindrical projection is right.
>
> My figures are off, in that my continents do not match earth's continents
> I am initiallty making a full globe image (-90 to 90 lat , -180 to 180 lon)
> similar to the big blue marble example.
>
> http://www.gearthblog.com/blog/archives/2006/11/blue_marble_ time_ani....
>
> but my image of the global map, does not reproduce the continents like
> in those images.http://mw1.google.com/mw-earth-vectordb/kml-samples/b mng12/files/BMNG...
>
> cheers,
> bob

This is the projection used by Google Earth overlays:

http://en.wikipedia.org/wiki/Plate_carre_projection

Looks like the GCTP Equirectangular projection (#117) supported by
MAP_PROJ_INIT is the one you need.

Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/

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[Message index]

		google earth projections By: R.G. Stockwell on Sat, 01 November 2008 13:20
		Re: google earth projections By: liamgumley on Tue, 04 November 2008 07:42
		Re: google earth projections By: R.G. Stockwell on Tue, 04 November 2008 08:09
		Re: google earth projections By: R.G. Stockwell on Mon, 03 November 2008 16:42
		Re: google earth projections By: R.G. Stockwell on Mon, 03 November 2008 08:56
		Re: google earth projections By: liamgumley on Mon, 03 November 2008 08:34
		Re: google earth projections By: David Fanning on Tue, 04 November 2008 14:24
		Re: google earth projections By: voorlandt on Mon, 24 November 2008 15:21
		Re: google earth projections By: R.G. Stockwell on Tue, 04 November 2008 14:10
		Re: google earth projections By: David Fanning on Tue, 04 November 2008 13:05
		Re: google earth projections By: voorlandt on Wed, 26 November 2008 06:01
		Re: google earth projections By: R.G. Stockwell on Tue, 25 November 2008 14:21
		Re: google earth projections By: voorlandt on Tue, 25 November 2008 14:05
		Re: google earth projections By: R.G. Stockwell on Tue, 25 November 2008 09:15
		Re: google earth projections By: David Fanning on Tue, 25 November 2008 07:18
		Re: google earth projections By: Matt[2] on Tue, 25 November 2008 07:07
		Re: google earth projections By: David Fanning on Mon, 24 November 2008 18:54
		Re: google earth projections By: David Fanning on Mon, 24 November 2008 18:48

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