I am trying to import a raster image of the North American geology (https://ngmdb.usgs.gov/gmna/) and the projection is defined as Modified spherical transverse Mercator with a central meridian of 100 deg W and a scale factor of 0.926.
My attempt is here "+proj=tmerc +lat_0=0 +lon_0=-100 +k=0.9260000000000001 +x_0=0 +y_0=0 +a=6371204 +b=6371204 +units=m +no_defs" but this does not work. The shp files associated with the image have prj files as follows PROJCS["User_Defined_Transverse_Mercator", GEOGCS["GCS_User_Defined",DATUM["D_User_Defined", SPHEROID["User_Defined_Spheroid",6371204.0,0.0]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0], PARAMETER["Central_Meridian",-100.0], PARAMETER["Scale_Factor",0.926], PARAMETER["Latitude_Of_Origin",0.0], UNIT["Meter",1.0]] Can anyone suggest changes to my projection file that I would need for this? Grant Boxer Perth, Western Australia
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