[mapserver-users] Diffrence in Proj4 and MapX values

[Richard Greenwood]

Be sure your projection and datum are the same for MapX and Proj4. It looks 
like you used the MapX "generic" lat/long for the MapX input, which can 
lead to strange behavior (MapX will match the projection to other layer 
present in the workspace). And it looks like MapX defaults to NAD27 for the 
Robinson.

Rich

7,231,574.7, 2,489,028.1

At 03:18 PM 1/16/2002 +0530, you wrote:
>hi
>I have been trying to project lat/long values to robinson projection using 
>Proj4 library
>But the result given by pro4 library is diffrent from those when evaluated 
>by MapX
>
>For eg.
>In Proj4: Input lat/long (78.410700,23.271500)
>Output in Robinson projection is (7233791.379929,2488879.797312) unit is 
>meters
>
>
>For the same input in MapX lat/long (78.410700,23.271500)
>Output in Robinson projection is 7231619.5648,2488958.638
>
>Thus is is appox a diffrence of 2172 meters in x
>and 79 meters in y
>
>Their is never a accurate match for Pro4 projected value and MapX 
>projected value.
>Can anybody help me to resolve it
>
>Regads
>Pranav
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