[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


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).

Olli Räisä
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