Reposted from
https://gis.stackexchange.com/questions/410874/mapserver-7-4-3-poor-projection-from-british-national-grid-epsg-27700-to-web
We have PostGIS data in BNG and are displaying it over Google satellite
imagery.
This worked fine previously - using a Ubuntu server running 18.04, with
MapServer 7.0.7, GDAL 2.2.3, proj 4.9.3.
This server is long out of date and we have a new one running 20.02,
with MapServer 7.4.3, GDAL 3.0.4 and proj 6.3.1. However this is
projecting the BNG layers incorrectly (~200m ESE).
This appears to be similar to the issue reported at
https://github.com/OSGeo/gdal/issues/3695
<https://github.com/OSGeo/gdal/issues/3695> although that claims the
problem only arose after proj 7.2.1
I have installed the updated transform OSTN15_NTv2_OSGBtoETRS.gsb but
this had no effect.
Is there a way to update the transforms used by MapServer or get
MapServer to pass the transformation to PostGIS ?
Thanks
Ben
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