Coordinate Conversion - WGS84 to SPCS (NAD83) about projnet4geoapi

[FObermaier]

You would have to code that yourself. There is a function to compute the UTM Zone based on longitude in ProjectedCoordinateSystem that might serve as example.

[FObermaier]

From the OGC WKT definition of e.g. NAD1983 SPCS Alabama I don't see what should prevent you from using this library:

// example ogc wkt for NAD83 SPCS spatial reference system 
const string spcsWkt = "PROJCS[\"NAD_1983_StatePlane_Alabama_East_FIPS_0101_Feet\",GEOGCS[\"NAD83\",DATUM[\"North_American_Datum_1983\"," +
    "SPHEROID[\"GRS 1980\",6378137,298.257222101,AUTHORITY[\"EPSG\",\"7019\"]],AUTHORITY[\"EPSG\",\"6269\"]]," +
    "PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"+
    "AUTHORITY[\"EPSG\",\"4269\"]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",30.5]," +
    "PARAMETER[\"central_meridian\",-85.8333333333333],PARAMETER[\"scale_factor\",0.99996],PARAMETER[\"false_easting\",656166.666666667]," +
    "PARAMETER[\"false_northing\",0],UNIT[\"US survey foot\",0.304800609601219,AUTHORITY[\"EPSG\",\"9003\"]],AXIS[\"Easting\",EAST]," +
    "AXIS[\"Northing\",NORTH],AUTHORITY[\"ESRI\",\"102629\"]]";

var csSrc = ProjNet.CoordinateSystems.GeographicCoordinateSystem.WGS84;
var csTgt = (ProjNet.CoordinateSystems.CoordinateSystem)ProjNet.IO.CoordinateSystems.CoordinateSystemWktReader.Parse(spcsWkt);

var ct = new ProjNet.CoordinateSystems.Transformations.CoordinateTransformationFactory().CreateFromCoordinateSystems(csSrc, csTgt);

(double x, double y) = ct.MathTransform.Transform(lat, lon);

I don't have any information regarding accuracy of the transformation, though.

[Avetis-Av]

The project I'm working can take latitude and longitude input anywhere in the US. Is it possible to determined which zone the given coordinates are in and give the specified easting and northing?