[Proj] Cct, proj_create_crs_to_crs and towgs84 parameters
Kristian Evers
kreve at sdfe.dk
Mon Feb 12 04:16:55 EST 2018
Hi Olli,
Thanks for reporting this. You assume correct. The issue has already been reported and mostly fixed. See the discussion here: https://github.com/OSGeo/proj.4/issues/783.
This should be fixed in RC3.
/Kristian
Fra: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] På vegne af Olli Räisä
Sendt: 12. februar 2018 09:36
Til: proj at lists.maptools.org
Emne: [Proj] Cct, proj_create_crs_to_crs and towgs84 parameters
Hello,
Proj-5.0.0RC2 cct outputs appear to differ from cs2cs outputs, when a coordinate reference system has non-zero towgs84 parameters.
An example:
bin\cs2cs +init=epsg:2393 +to +init=epsg:3879
3500000 6650000 0
25611546.42 6651551.63 25.30
bin\cct -t0 +proj=pipeline +step +init=epsg:2393 +inv +step +init=epsg:3879
3500000 6650000 0
25611608.8193 6651462.4308 340.2153 0.0000
Looking at proj_create_crs_to_crs function code, I assumed that these commands produce the same results (within some tolerance).
Regards,
Olli Räisä
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