What projection is Worldwind Java Imagery In?

jdorny · 07-20-2007, 08:31 PM

All,

I am attempting to add my one imagery using pat's Surface Image. It is working well but seems slightly off ontop of the worldwind imagery. I suspect this is projection related.

Question: what projection is Worldwind java imagery in?

Question: What datum is Worldwind java using?

Thanks,

Jared

patmurris · 07-21-2007, 01:35 AM

Projection is the 'plate carré' or Equirectangular projection.
I'm not sure about the datum... WGS84 ?

withak · 07-21-2007, 01:40 AM

Yup, WGS84. That's EPSG:4326 if you are using real GIS software.

jdorny · 07-21-2007, 01:50 AM

Thanks guys. I appreciate the quick reply.

patmurris · 07-21-2007, 02:10 AM

Quote:

Originally Posted by jdorny

Thanks guys. I appreciate the quick reply.

You're welcome

Please let us know what kind of trouble you may run into with other projections. I'm still unsure how to handle them with wwj...

BTW: withak, any idea what projections do GE, Virtual Earth, or the french Geoportail use ?

withak · 07-21-2007, 02:20 AM

GE and VE do everything in lat/lon coordinates; I assume geoportail does also. I don't know what datum they use, but it's probably WGS84.

VE uses some other projection for its image tiles, which is why the VE plugin for .NET WW needs the proj.4 dll. But I think it only has to convert the corner coordinates for each tile because the transformation is only linear horizontal and vertical scaling, no rotation.

m_k · 07-21-2007, 11:46 AM

GE is lat/lon, VE (and Google Maps) are Mercator, Geoportail uses some French SRS (Lambert2e or Lambert93)

07-20-2007, 08:31 PM	#1
jdorny Member Join Date: Jun 2007 Posts: 50	What projection is Worldwind Java Imagery In? All, I am attempting to add my one imagery using pat's Surface Image. It is working well but seems slightly off ontop of the worldwind imagery. I suspect this is projection related. Question: what projection is Worldwind java imagery in? Question: What datum is Worldwind java using? Thanks, Jared

07-21-2007, 01:35 AM	#2
patmurris WWJ Consultant Join Date: Jun 2005 Location: Saint-Paul de Vence, Alpes Maritimes, France Posts: 3,412	Projection is the 'plate carré' or Equirectangular projection. I'm not sure about the datum... WGS84 ? __________________ My World Wind Java Blog & WW.net Plugins page Last edited by patmurris; 07-21-2007 at 01:37 AM.

07-21-2007, 01:40 AM	#3
withak What? Join Date: Apr 2005 Location: San Francisco, California Posts: 2,461	Yup, WGS84. That's EPSG:4326 if you are using real GIS software. Last edited by withak; 07-21-2007 at 01:55 AM.

07-21-2007, 11:46 AM	#7
m_k Bored Explorer Join Date: Nov 2004 Location: Warsaw, Poland Posts: 1,808	GE is lat/lon, VE (and Google Maps) are Mercator, Geoportail uses some French SRS (Lambert2e or Lambert93) __________________ Hot stuff: FAQ, forum search, DirectX, .NET, Video Card Compatibility list

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07-21-2007, 01:50 AM	#4
jdorny Member Join Date: Jun 2007 Posts: 50	Thanks guys. I appreciate the quick reply.

07-21-2007, 02:20 AM	#6
withak What? Join Date: Apr 2005 Location: San Francisco, California Posts: 2,461	GE and VE do everything in lat/lon coordinates; I assume geoportail does also. I don't know what datum they use, but it's probably WGS84. VE uses some other projection for its image tiles, which is why the VE plugin for .NET WW needs the proj.4 dll. But I think it only has to convert the corner coordinates for each tile because the transformation is only linear horizontal and vertical scaling, no rotation.

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