Some people working on a the construction site use a local custom coordinate system. I have been given a proj4 string like this:
+proj=omerc +lat_0=46.325454996 +lonc=7.99050231 +alpha=60.4026421358 +gamma=90 +k=1 +x_0=350 +y_0=200 +datum=WGS84 +units=m +no_defs +type=crs
And x,y coordinates like this 429.079425606807, 261.126436507318
And I need to convert their coordinates into WGS84 and back
I tried to use the DotSpatial to make the transformation. Any other libraries in C# can be accepted.
string proj4_custom = "+proj=omerc +lat_0=46.325454996 +lonc=7.99050231 +alpha=60.4026421358 +gamma=90 +k=1 +x_0=350 +y_0=200 +datum=WGS84 +units=m +no_defs +type=crs"; DotSpatial.Projections.ProjectionInfo src = DotSpatial.Projections.ProjectionInfo.FromProj4String(proj4_custom); int googleEPSGCode = 4326; DotSpatial.Projections.ProjectionInfo trg = DotSpatial.Projections.ProjectionInfo.FromEpsgCode(googleEPSGCode); double[] xy = new[] { 429.079425606807, 261.126436507318 }; double[] z = new[] { 0d }; DotSpatial.Projections.Reproject.ReprojectPoints(xy, z, src, trg, 0, 1); But the result in xy is not correct, on the map it's about 50 to 100 meters away. I should have a result really close to this correct result
Local coordinates: 429.07942560 261.1264365 WGS84: 7.99100318 46.326284519 What am I doing wrong?? If the problem is related to a bug in the libraries, what other libraries can I use that do it correctly?
