Hello,
I have a problem showing data in the former Swedish standard reference
system RT90 2,5 gon V. The point is projected ~250 meters northwest of where
it should be. I have used the projection parameters for MapServer from
Spatialreference.org.
The underlying map projection is SWEREF 99 TM (the new standard Swedish
reference system), with the following projection parameters:
PROJECTION
'proj=utm'
'zone=33'
'ellps=GRS80'
'towgs84=0,0,0,0,0,0,0'
'units=m'
'no_defs'
END
I have then tested to pinpoint an intersection, in both WGS-84 and RT90, but
the RT90 point does not end up where it should be. I have double checked
that the RT90 coordinates are correct by transforming them to WGS-84. See my
attached screenshot.
http://n2.nabble.com/file/n4438959/rt90_mapserver_error.jpg
For the WGS-84 point I have the following projection parameters:
PROJECTION
'proj=longlat'
'ellps=WGS84'
'datum=WGS84'
'no_defs'
'units=m'
END
And the RT90 point has:
PROJECTION
"proj=tmerc"
"lat_0=0"
"lon_0=15.80827777777778"
"k=1"
"x_0=1500000"
"y_0=0"
"ellps=bessel"
"units=m"
"no_defs"
END
I have also tried all the other RT90 projections provided by
Spatialreference.org, just to see if any of them would work better, but
without luck.
Have I made a mistake somewhere, or are there any suggestions of why this
error occurs? I'm out of ideas.
Regards,
Sofia
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