Comments (4)
proj4-bot
commented on September 28, 2024
Comment by warmerdam on 27 Nov 2008 14:36 UTC
Jan,
Could you provide the exact command used for at least a couple of these? Did you use cs2cs? Also, was this 4.6.1?
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proj4-bot
commented on September 28, 2024
Comment by janh on 27 Nov 2008 15:23 UTC
Sorry Frank, I have been mixing versions. I use Proj 4.6.1, but the tests were done with an older version of PostGIS, without realizing that it probably uses an older version of the library. I am not sure of all is well with 4.6.1 though. I reran the same test with cs2cs under proj 4.6.1 with the attached shell-file. It gives better results than my first run, but I suspect the projection still uses a WGS84 datum shift by default. Note that all transformations result in the same coordinates as when a datum shift to WGS84 is explicitly requested, except when a) a different datum is requested in the target projection and b) a +nadgrid=@null is specified in the source projection
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proj4-bot
commented on September 28, 2024
Attachment added by janh on 27 Nov 2008 15:23 UTC
https://trac.osgeo.org/proj/attachment/ticket/22/testdatum.sh
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kbevers
commented on September 28, 2024
Tried to reproduce this with the script below.
echo "1."
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs +to +proj=longlat +ellps=bessel +no_defs
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +nadgrids=@null +no_defs +to +proj=longlat +ellps=bessel +no_defs
echo " "
echo "2."
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs +to +proj=longlat +ellps=bessel +nadgrids=@null +no_defs
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +nadgrids=@null +no_defs +to +proj=longlat +ellps=bessel +nadgrids=@null +no_defs
echo " "
echo "3."
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs +to +proj=longlat +ellps=bessel +datum=WGS84 +no_defs
echo 9018 375648 0 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +nadgrids=@null +no_defs +to +proj=longlat +ellps=bessel +datum=WGS84 +no_defs
echo " "
echo "4."
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs +to +proj=longlat +datum=WGS84 +no_defs
echo 9018 375648 |./cs2cs -f %.6f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m +nadgrids=@null +no_defs +to +proj=longlat +ellps=bessel +no_defs
Which results in the following output:
1.
3.291612 51.352060 0.000000
3.291612 51.352060 0.000000
2.
3.291612 51.352060 0.000000
3.291612 51.352060 0.000000
3.
3.291612 51.352060 0.000000
3.291612 51.351477 699.339164
4.
3.291612 51.352060 0.000000
3.291612 51.352060 0.000000
I conclude that what is discussed in this issue is mostly fixed. The unexpected results in 3) is probably caused by the ellipsoid parameters being adjusted in pj_datum_transform() although the coordinates are not changed. Effectively this results in converting the coordinates from the WGS84 ellipsoid to the Bessel ellipsoid, which is backed up by
echo 3.291612 51.352060 0.000000 |./cct +proj=pipeline +step +proj=cart +ellps=WGS84 +step +proj=cart +ellps=bessel +inv
3.2916120000 51.3514765406 699.3392 inf
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