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PROJ6 issues with +proj=ob_tran +o_proj=latlon #1601

fmaussion opened this issue Sep 11, 2019 · 1 comment


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@fmaussion fmaussion commented Sep 11, 2019

Hi, I'm a pyproj user and have been told to open an issue here instead. Background: pyproj4/pyproj#424

The output of this command is off by a huge amount in recent PROJ versions:

$ echo "-20 -9" | cs2cs -f '%.2f' '+proj=ob_tran +o_proj=latlon +ellps=WGS84 +to_meter=0.0174532925199433 +o_lon_p=0.0 +o_lat_p=80.5 +lon_0=357.5 +no_defs' '+init=epsg:4326'

outputs 107.25 -27.89 0.00, but it should rather output something like -22.24 -0.06

@rouault rouault changed the title PROJ6 issues with +init=epsg:4326 PROJ6 issues with +proj=ob_tran +o_proj=latlon Sep 11, 2019

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@rouault rouault commented Sep 13, 2019

Fix in #1610
Workaround: use +o_proj=longlat

@rouault rouault closed this in e1fabf9 Sep 13, 2019
rouault added a commit that referenced this issue Sep 13, 2019
Fix support for +proj=ob_tran +o_proj=lonlat/latlong/latlon (only +o_proj=longlat worked) (fixes #1601)
backporting bot pushed a commit that referenced this issue Sep 13, 2019
…proj=longlat worked) (fixes #1601)
rouault added a commit that referenced this issue Sep 13, 2019
[Backport 6.2] Fix support for +proj=ob_tran +o_proj=lonlat/latlong/latlon (only +o_proj=longlat worked) (fixes #1601)
mir06 added a commit to wegener-center/pyCAT that referenced this issue Oct 1, 2019
Due to the bug in proj4 (see issue OSGeo/PROJ#1601)
the package must be installed in version 6.1.0.

Added two tests that run the proposed checking of the
two methods.

Closes: #5
@snowman2 snowman2 mentioned this issue Nov 1, 2019
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