Confusing description for the direction of .gtx files

OSGeo / proj-datumgrid

Historic repository for proj datum grids. New developments are at https://github.com/OSGeo/PROJ-data

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Confusing description for the direction of .gtx files #44

Closed rouault closed 5 years ago

rouault commented 5 years ago

README.EUROPE mentions for example "Denmark: GRS80 ellipsoidal heights -> DVR90 heights", but the content of the dvr90.gtx file is the value to add to a DVR90 height to get a GRS80 ellipsoidal height, so I think it would be less confusing to name it "Denmark: DVR90 heights -> GRS80 ellipsoidal heights". The same applies for most of other .gtx file descriptions

kbevers commented 5 years ago

Yeah, that's correct (at least for DVR90). This stuff is always super confusing!

rouault commented 5 years ago

Fixed per https://github.com/OSGeo/proj-datumgrid/pull/45