Hi Jukka,
Wonderful! You fixed the problem, thank you very much! This solution saves me
hours of work. :)
And you are right about the 'units=m' in the wgs84 projection, it works fine
without it.
Regards,
Sofia
Från: Rahkonen Jukka [jukka.rahko...@mmmtike.fi]
Skickat: den 22 januari 2010 16:06
Till: Sofia Bryntse; mapserver-users@lists.osgeo.org
Ämne: Re: [mapserver-users] Projection error, RT90 in MapServer
Hi,
How about these parameters?
+proj=tmerc +lat_0=0 +lon_0=15.808278 +k=1 +x_0=150 +y_0=0
+ellps=bessel +units=m
+towgs84=414.0978567149,41.3381489658,603.0627177516,-0.8550434314,2.1413465,-7.0227209516,0
+no_defs
Taken from
http://www.zonefivesoftware.com/SportTracks/Forums/viewtopic.php?t=3543postdays=0postorder=ascstart=25
By the way, I suppose the unint in your WGS84 definition are wrong. Maybe you
do not need the line at all.
PROJECTION
'proj=longlat'
'ellps=WGS84'
'datum=WGS84'
'no_defs'
'units=m'
END
-Jukka-
-Alkuperäinen viesti-
Lähettäjä: Sofia Bryntse [mailto:sofia.bryn...@et.slu.se]
Lähetetty: pe 22.1.2010 16:09
Vastaanottaja: Rahkonen Jukka; mapserver-users@lists.osgeo.org
Aihe: SV: [mapserver-users] Projection error, RT90 in MapServer
Hi Jukka,
Thank you, I tried adding your line to my RT90 projection parameter list now,
but it didn't help. The point moved 50 meters or so, but not in the right
direction. (See attached screenshot.)
Regards,
Sofia
Från: Rahkonen Jukka [jukka.rahko...@mmmtike.fi]
Skickat: den 22 januari 2010 11:16
Till: Sofia Bryntse; mapserver-users@lists.osgeo.org
Ämne: Re: [mapserver-users] Projection error, RT90 in MapServer
Hi,
Have you tried adding 'towgs84=0,0,0,0,0,0,0' also to RT90 definitions?
-Jukka Rahkonen-
-Alkuperäinen viesti-
Lähettäjä: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] Puolesta Fia
Lähetetty: 22. tammikuuta 2010 10:56
Vastaanottaja: mapserver-users@lists.osgeo.org
Aihe: [mapserver-users] Projection error, RT90 in MapServer
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=15.808278
k=1
x_0=150
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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