Checks if the provided longitude (in decimal degrees) is valid for the user defined reference ellipsoid, i.e. if it can be used in GIS calculations in the UTM coordinate system.

Parameters

semiMajorAxisAInM

a semi major axis A (in meters) of the user defined reference ellipsoid

inverseFlattening

an inverse flattening of the user defined reference ellipsoid

utmZone

a UTM zone

lonInDeg

a longitude (in decimal degrees) to validate

errorMessage

an error message, passed by reference (out), that contains detailed information in case of the invalid longitude

Return Value

true - if the longitude is valid, false - if the longitude is invalid

Remarks

The function checks validity of its arguments. The valid semi major axis A (in meters) is a real number greater than 0. The valid inverse flattening is a real number greater than 0. The valid longitude is a real number in the range from -MaxLon (exclusive) to MaxLon (exclusive). MaxLon is the function of the reference ellipsoid and the UTM zone. It takes into account the 40.0 km overlap with the adjacent UTM zones and 0.5 degree overlap with UPS (Univeral Polar Stereographic) projection.

Example

This sample shows how to call the UTM.IsValidLongitudeInDeg method from C# code:

string errorMessage = String.Empty;
double lonInDeg = 38.889139;
UtmZone utmZone = UtmZone.Zone_01_from_180W_to_174W;
            
if (UTM.IsValidLongitudeInDeg(semiMajorAxisAInM, inverseFlattening, utmZone, lonInDeg, out errorMessage))
{
    Console.WriteLine("Longitude is valid.");
}
else
{
    Console.WriteLine(errorMessage);
}

See Also

UTM Class | ApsGis Namespace