Changes between Version 8 and Version 9 of DevWikiRealParameters


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Timestamp:
Nov 29, 2011 11:17:22 AM (8 years ago)
Author:
bnordgren
Comment:

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  • DevWikiRealParameters

    v8 v9  
    7171[[Image(thetatest_ij.png)]]
    7272
    73 So, if θ,,test,, is more than 90 degrees, θ,,ij,, = - abs(θ,,ij,,). Otherwise, θ,,ij,, = abs(θ,,ij,,).
     73So, if θ,,test,, is more than 90 degrees, θ,,ij,, = - abs(θ,,ij,,). Otherwise, θ,,ij,, = abs(θ,,ij,,). 
    7474
     75If θ,,ij,, has any value other than +-90 degrees, the basis vectors are not orthogonal and the transformed pixels are diamond shaped. Probably the most common value for θ,,ij,, is -90 degrees, which indicates that the transform "flips" the '''j''' axis.
     76
     77== Summary ==
     78
     79The method presented here performs calculations in the coordinate system used by the geocoordinates. All of the parameters calculated by this method are tied to the same SRID referenced by the transform '''O'''. It is assumed that the x and y axes of the geospatial coordinate system are orthogonal.
    7580
    7681== See also ==