[Proj] Google Earth Accuracy

Markus Neteler neteler at osgeo.org
Sun Nov 30 12:41:14 EST 2008

On Sun, Nov 30, 2008 at 6:11 PM, Irwin Scollar <al001 at uni-koeln.de> wrote:
> GE uses Plate Carée as is documented on their KML developer's web site. I
> suspect that this is done for speed of calculation in an interpreted Web
> environment as well as for relaxed requirements for making mosaics from
> images of different qualities.  For small areas, it seems good enough.

How about precision in mountainous regions such as the Southern Alps?
PROJ4/OGR reprojected mountain peak points from geonames.org as
well as known points from our province are off for > 100m when
visualized in GE which they match our local orthophotos. Is the positional
error related to the height of the point (here, satellite orthorectification)?


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