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orthographic Projection

This is a discussion on orthographic Projection within the MapPoint Web Service and Virtual Earth 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 04-13-2007
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 05-16-2007
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Join Date: May 2007
Posts: 7
Re: orthographic Projection
You can use any convenient units for R, as long as the same units are used for x and y. The angles have to be consistent as well, and have to be in radians for most programming use. Note the statement about the atan2 function; an atan function that doesn't take account of the quadrant of the input values for returning the right sign of the result will cause the map to fold on top of itself.
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