Interesting I'll try to convert the .gsb file again. I used this resource https://github.com/OSGeo/proj.4/wiki/VerticalDatums GDALInfo returned a similar result C:\OSGeo4W64\bin\gdalinfo.exe "C:\Users\Woody\Downloads\AUSGeoid09_V1.01.gtx" Driver: GTiff/GeoTIFF Files: C:\Users\Woody\Downloads\AUSGeoid09_V1.01.gtx Size is 3120, 2280 Coordinate System is: GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]] Origin = (107.991666666666660,-7.991666666666666) Pixel Size = (0.016666666666666,-0.016666666666666) Metadata: AREA_OR_POINT=Area CREATED=01012010 GS_TYPE=SECONDS MAJOR_F=6378137 MAJOR_T=6378137 MINOR_F=6356752.314 MINOR_T=6356752.314 PARENT=NONE SUB_NAME=AUSGEOID SYSTEM_F=GDA94 SYSTEM_T=AHD_1971 UPDATED=01012010 VERSION=1.0.0.0 Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( 107.9916667, -7.9916667) (107d59'30.00"E, 7d59'30.00"S) Lower Left ( 107.9916667, -45.9916667) (107d59'30.00"E, 45d59'30.00"S) Upper Right ( 159.9916667, -7.9916667) (159d59'30.00"E, 7d59'30.00"S) Lower Right ( 159.9916667, -45.9916667) (159d59'30.00"E, 45d59'30.00"S) Center ( 133.9916667, -26.9916667) (133d59'30.00"E, 26d59'30.00"S) Band 1 Block=3120x1 Type=Float32, ColorInterp=Gray Description = Latitude Offset (arc seconds) Band 2 Block=3120x1 Type=Float32, ColorInterp=Undefined Description = Longitude Offset (arc seconds) Band 3 Block=3120x1 Type=Float32, ColorInterp=Undefined Description = Latitude Error Band 4 Block=3120x1 Type=Float32, ColorInterp=Undefined Description = Longitude Error
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