I recently upgraded to gdal 3.0 and 3.1 on two computers. When using ogr2ogr to create MapInfo files the coordinate system of the resulting MapInfo files is incorrect. The coordinate system is epsg:3739 which uses US Survey Feet. I used MapInfo to convert the native binary file to MapInfo's external ASCII format to be able to see the coordinate system definition. With gdal <3.0 the correct MapInfo definition is: CoordSys Earth Projection 8, 74, "survey ft", -110.083333333333, 40.5, 0.9999375, 2624666.6666999999, 328083.3333 Bounds (-30000000, -15000000) (30000000, 15000000) With gdal 3.0 and 3.1 it is: CoordSys Earth Projection 8, 74, "m", -110.083333333333, 40.5, 0.9999375, 2624666.6666999999, 328083.3333 Bounds (-27375333.3333, -14671916.6667) (32624666.6667, 15328083.3333)
I'm running gdal on Linux, gdal 3.0 with proj 6.3 from the Ubuntu 20.04 distribution and gdal 3.1 with proj 7.1 built from source. Any suggestions for other things to look at? I'm happy to dig into this more if anyone has suggestions. Thanks, Rich -- Richard W. Greenwood, PLS www.greenwoodmap.com
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