On 06/06/2011 10:41 AM, Torben Dannhauer wrote:
Hi Simon,
of course it would be a (very) dirty hack. The VPB Terrain creation is well
tested, so my first guess was the problem is the data itself.
Cheers,
Torben
Torben, you were right.
After further investigations I found the real cause of my coordinate
offsets. I post my finding as I hope it is useful for other (Swiss) OSG
users.
The initial data is stored in CH1903 coordinates. This data is then
converted to WGS84. This conversion is an approximation and introduces a
spacially varying error in the order of 3 - 5 arc seconds. The details
of the conversion can be found in this document:
http://www.swisstopo.admin.ch/internet/swisstopo/en/home/topics/survey/sys/refsys/switzerland.parsysrelated1.37696.downloadList.97912.DownloadFile.tmp/swissprojectionen.pdf
from this page:
http://www.swisstopo.admin.ch/internet/swisstopo/en/home/topics/survey/sys/refsys/projections.html
Now I can fix it properly by adding this error offset to the OSM
coordinates.
Thanks again!
Cheers,
Simon
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