Hey folks:
I've got a bunch of TIFF and JPEG image files of scanned val maps, and I'm using GIS software to georeference them on top of basemaps in this mapping software. It's going pretty well, but then I got to thinking I might get better accuracy if I project the basemap into the same projection being used by the val maps, to minimize the amount of rubbersheeting the software needs to do.
Is there some standard map projection that val maps use? Or maybe it varies by railroad or varies by the year, decade, (or century) it was created?
Thanks in advance for any ideas you might have.
I've got a bunch of TIFF and JPEG image files of scanned val maps, and I'm using GIS software to georeference them on top of basemaps in this mapping software. It's going pretty well, but then I got to thinking I might get better accuracy if I project the basemap into the same projection being used by the val maps, to minimize the amount of rubbersheeting the software needs to do.
Is there some standard map projection that val maps use? Or maybe it varies by railroad or varies by the year, decade, (or century) it was created?
Thanks in advance for any ideas you might have.