When using gdaltranslate and gdalwarp I specify the following transfomation (in for GCP's and translate, out for warp)
+proj=lcc +lat_1=40.03333333333333 +lat_2=38.73333333333333 +lat_0=38 +lon_0=-82.5 +x_0=1968500 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=us-ft +no_defs
This is intended to be the proj4 equivalent of Ohio South state plane US feet. If I open it in GlobalMapper it is placed exactly correctly (about -83 lon) though it isn't identified as Ohio South. However when I run listgeo the coordinates in feet are listed, but the lat long are not shown, and if I run gdalinfo the coordinates come back as
Upper Left ( 1747866.344, 712518.960) ( 99d 6'46.00"W, 38d45'47.64"N)
with the longitude being completely off base. I also notice that the false_easting in gdalinfo come up as
which I also don't understand since I set it directly in the projection as 1968500'
In the end what I really want to do is digitize some coordinates in state plane, US survey foot, run them through translate to create a VRT file, then warp that and output Geotiff that has a recognized projection and will read directly into Global Mapper. I tried just using a prj or wkt file, but once I edit it to change the units to feet then the resulting Geotiff has the following tags either deleted or set wrong.
GTModelTypeGeoKey (Short,1): ModelTypeProjected (ends up user-defined)
ProjectedCSTypeGeoKey (Short,1): PCS_NAD83_Ohio_South (ends up missing)
Any thoughts on what I am doing wrong would be greatly appreciated.