Coordinate system is not supported — TOWGS84 in WKT

[rusty]

HI Alexey,

We are providing PhotoScan with a crs definition that does not include a TOWGS84 definition.
This results in a "coordinate system is not supported" error.

According to epsg.io / the EPSG database / gdal, this WKT is valid. ( example: http://epsg.io/6603 )

It is not possible to simply add a TOWGS84[0,0,0,0,0,0,0], as although the behaviour may be the same in PhotoScan, tools like GDAL actually produce different results when transforming coordinates if this is added.

We need PhotoScan to be able to accept WKT like this, so we can have continuity in the CRS definition we use across other tools.

[Alexey Pasumansky]

Hello rusty,

Can you please provide the PRJ file for the system that you are using?

Actually it should be possible to add TOWGS84 section to the WKT definition of the coordinate system and load it as custom coordinate system to be used in PhotoScan.

[rusty]

One example is http://epsg.io/6603 — NAD83(2011) / West Virginia South (ftUS)

GDAL accepts this WKT, but if TOWGS84[0,0,0,0,0,0,0] is added to the DATUM, it will be interpreted slightly differently.

The PRJ is attached.