I have several polygon shapefiles whose coordinates are defined as 100x their original coordinates projected from the Washington State South HARN State Plane in us-ft (EPSG 2927). I would imagine the purpose of this scheme is to represent more precise coordinates in integer form. Unfortunately, I am having a hard time representing this custom coordinate system as a proj4 specification in QGIS. Each of these shapefiles has a .prj file and no .qpj file.
Things I have tried or thought of:
- creating a custom proj file by editing the +units parameter to "us-ft/100" (not defined).
- the .prj file has a parameter called "scale-factor" that I tried to set to 0.01, but QGIS does not appear to read this (not sure if the .prj file is being ignored or just this parameter).
- using a geoalgorithm to "rescale" each feature in the shapefile by 0.01, so that they actually fit within the standard EPSG 2927 CRS.
- Going back to the original application (Geomedia) to reproject the shapefile, which I am finding is difficult with shapefiles. I would also just like to know if there is a more "open source" way of doing this.
What is the best way to accomplish this task in QGIS?