ThinkGeo.com    |     Documentation    |     Premium Support

Empty proj string when resolving by SRID

#1

Hi
I’m trying to get a PROJ string via “Projection.GetProjStringByEpsgSrid” for srid 7415 but I get an empty string back. Is this because it’s a compound crs? Using latest 12.3.12
Cheers

#2

Hi Kev,

GetProjStringByEpsgSrid is kinda out of date, we’ll update it in the near future.

For this case, proj4 string of EPSG 7415 can be found on https://epsg.io/7415. Then we can pass this proj4 string to ProjectionConverter, below is sample code.

        string proj7415Str = "+proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel +towgs84=565.417,50.3319,465.552,-0.398957,0.343988,-1.8774,4.0725 +units=m +vunits=m +no_defs";
        ProjectionConverter projectionConverter = new ProjectionConverter(proj7415Str, Projection.GetDecimalDegreesProjString());
        projectionConverter.Open();

        PointShape originalPoint = new PointShape(142892.19, 470783.87);
        PointShape convertedPoint = (PointShape)projectionConverter.ConvertToExternalProjection(originalPoint);

Thanks,
Leo