[Proj] Cct, proj_create_crs_to_crs and towgs84 parameters
Olli Räisä
olli.raisa at trimble.com
Mon Feb 12 03:36:01 EST 2018
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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