Am 27.10.2017 um 21:25 schrieb Tyler Veinot:
We determined that it is because PROJ4 assumes gridshifts are always from X datum to WGS84, but NAD83 uses GRS80 so my question is, is there a way around this? Should I use a NAD27 to WGS84 gridshift and let QGIS reporject it to NAD83 CSRS? Or is QGIS running on the notion that the 2 are coincidental?
All NAD83 CRS inside QGIS have +towgs84=0,0,0,0,0,0,0 , so NAD83 and WGS84 are treated as identical. You have to build a custom CRS if you want to apply a NAD83 shift from WGS84.
HTH, André Joost _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
