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orthographic Projection

This is a discussion on orthographic Projection within the Bing Maps and MapPoint Web Service 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 ...

  1. #1
    bramu is offline 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

  2. #2
    SkoreKeep is offline Junior Member White Belt
    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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