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Orthographic Projection

This is a discussion on Orthographic Projection within the MapPoint 2006/2009 Discussion forums, part of the Map Forums category; Hi Friends I need to implement orthographic Projection over an image generated by Mappoint webservice. I am using the equations ...


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Old 04-11-2007
Junior Member
Yellow Belt
  
Join Date: Mar 2007
Posts: 13
Orthographic Projection
Hi Friends

I need to implement orthographic Projection over an image generated by Mappoint webservice.

I am using the equations found on
Orthographic projection (cartography) - Wikipedia, the free encyclopedia

but it seems that it is not working. My first question is what is the value of the earth radius to be used in these equations? Must it be in m, km or other units?

any help is really appreciated.

regards
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Old 04-17-2007
Senior Member
Green Belt
  
Join Date: Sep 2003
Posts: 103
Re: Orthographic Projection
Im not sure of the answer to your question but I looked at this a while ago and come across this very usefull bit of code

Developing map projections with Java, the orthographic map projection

Its in Java but shouldn't be too hard to translate the useful bits into the language of your choice.
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Old 04-18-2007
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Join Date: Mar 2007
Posts: 13
Re: Orthographic Projection
Thx, but what value I need to assign for R ?

Regards
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