I'll have to georeference (with a dgps) an archaeological site plan (2.7 km²) that's been done using local coordinate system (total station)
The actual GIS project in local coordinates contains a lot of data (vectors and rasters).
I'm looking for a way to avoid having to re-project each layer one by one but rather move all layers at once to absolute coordinates (UTM)
I was thinking about creating a custom CRS for all the local coordinate layers calculating the offset between the local and UTM coordinates. I've never done that before.
Do you think it's a good idea?