static void BilinearInterpolationTest()
{
Console.WriteLine("Start BilinearInterpolationTest.");
// https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/
var srtmData = new SRTMData(@"srtm-cache", new USGSSource());
double?elevationInnsbruck = srtmData.GetElevationBilinear(47.267222, 11.392778);
Console.WriteLine("Bilinear elevation of Innsbruck: {0}m", elevationInnsbruck);
double?elevationLaPaz = srtmData.GetElevationBilinear(-16.5, -68.15);
Console.WriteLine("Elevation of La Paz: {0}m", elevationLaPaz);
double?elevationKathmandu = srtmData.GetElevationBilinear(27.702983735525862f, 85.2978515625f);
Console.WriteLine("Elevation of Kathmandu {0}m", elevationKathmandu);
double?elevationHanoi = srtmData.GetElevationBilinear(21.030673628606102f, 105.853271484375f);
Console.WriteLine("Elevation of Ha Noi {0}m", elevationHanoi);
// tries to get elevation from an empty cell.
double?elevationSomeplace1 = srtmData.GetElevationBilinear(52.02237f, 2.55853224f);
Console.WriteLine("Elevation of nowhere returns {0}", elevationSomeplace1);
double?elevationNamibia1 = srtmData.GetElevationBilinear(-20, 19.89597);
Console.WriteLine("Elevation of namibia1 returns {0}", elevationNamibia1);
//Testing interpolation across cell edges
double?elevationOxted = srtmData.GetElevationBilinear(51.2525, 0.00001);
Console.WriteLine("Elevation of Oxted {0}m", elevationOxted);
Console.WriteLine("End BilinearInterpolationTest.");
}
