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RT90 and other RT wrongly transformed

Feb 24, 2015 at 4:58 PM
Hi, I am using DotSpatial to convert from various projections to/from WGS 84 and discovered that DotSpatial transforms RT projections (like RT90 2.5 gon W thats common in Sweden) wrongly.

DotSpatial transformation, from WGS 84 to RT 90 2.5 gon V
lon = 14.669705477644305
lat = 63.175727630455484

X = 1442661.7526688953
Y = 7007741.2557378784

The correct X/Y should be 7007850.027 / 1442818.979 which differs with quite a lot (meter based coords),

Is there anyway to fix this?