Changes between Version 8 and Version 9 of Help/Plugin/PicLayer


Ignore:
Timestamp:
2010-10-29T23:40:43+02:00 (15 years ago)
Author:
Eric S
Comment:

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  • Help/Plugin/PicLayer

    v8 v9  
    5050The latitude b can be calculated from y by b = 2*arctan(e!**y) - 45 (when inverse tangent returns degrees).[[BR]]
    5151When transforming longitude degree differences of image corners to distance, you have to take into account that one degree east-west has different size dependent on latitude.[[BR]]
    52 At equator 1 degree -> d0 = 111.2 km, at latitude b you get d = d0*cos(b) (only exact for sphere, but deviation from ellipsoid < 0.5%).
     52At equator 1 degree -> d0 = 111.321 km (from GRS 80 semi-major axes), at latitude b you get d = d0*cos(b) (only exact for sphere, but deviation from ellipsoid < 0.5%).
    5353
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