New answers tagged datum
I ran some tests with sample coordinates -63E 18N with GDAL cs2cs: cs2cs +init=epsg:4326 +to +init=epsg:4600 Anguilla.txt >out.txt cs2cs +init=epsg:4326 +to +proj=latlon +ellps=clrk80 +no_defs Anguilla.txt >>out.txt cs2cs +init=epsg:4326 +to +proj=latlon +ellps=clrk80 +no_defs +towgs84=0,0,0,0,0,0,0 Anguilla.txt >>out.txt cs2cs ...
Note: simplified explanation The relationship between two datums (geographic coordinate reference systems) is not just that they may have different ellipsoids. Differing ellipsoids mean different sizes and shapes. If you treat both datums as being earth-centered (center at 0,0,0 in 3D Cartesian coordinates), and convert between them, you may see latitude ...
I would suggest to use the correct EPSG codes, that is: EPSG:4267 NAD27 EPSG:4269 NAD83 EPSG:4326 WGS84 You will get the better values -104.500522187483 39.4999860425 between the first ones. The last two are identical for GDAL.
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