I'm fairly new to the ProjNet library and GIS in general so please bare with me.

I have a set of coordinates from a EPSG:32038 system and I'm trying to convert to decimal Latitude and Longitude (WGS 1984). The result from ProjNet is about 700 feet south of the supposed location.

Input coordinates:

x = 1979302.949; y = 437337.980;

WKT used to define EPSG: 32038

PROJCS["NAD27 / Texas North Central",GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.9786982138982]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["standard_parallel_1",32.13333333333333],PARAMETER["standard_parallel_2",33.96666666666667],PARAMETER["latitude_of_origin",31.66666666666667],PARAMETER["central_meridian",-97.5],PARAMETER["false_easting",2000000],PARAMETER["false_northing",0],UNIT["Foot_US",0.30480060960121924]]

The result from ProjNet are:

latitude    32.866837297179472  
longitude   -97.56741127050887

I cross checked with NOAA's SPC to GEODETIC online tool and the results converted from DMS to decimal Lat Long are:

latitude    32.86879
longitude   -97.567574

The result from NOAA is a lot closer than what I'm getting from ProjNet. The WKT is copied from Spatial Reference website and cross checked with ESPG website. At this point, I'm not sure if the WKT used is incorrect or an issue in ProjNet.

  • Projnet may not be doing the datum conversion from nad27 to wgs84. – mkennedy Feb 24 '16 at 13:37
  • Thanks for the reply mkennedy, I tried your theory by switching to DotSpatial Projection and the resulting Latitude and Longitude is right on the money. – MooCow Feb 25 '16 at 6:18

I think you can't compare both results. Projection conversions in a geodetic enviroment (and NOAA's conversion suppose) are calculated using more parameters than the WKT definition. (Like points measured in both Reference Systems).

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