// Computes the amount of latitude degrees for a given distance in pixel at a given zoom level.
private static double deltaLat(double deltaPixel, double lat, sbyte zoom, int tileSize)
{
long mapSize = MercatorProjection.getMapSize(zoom, tileSize);
double pixelY = MercatorProjection.latitudeToPixelY(lat, mapSize);
double lat2 = MercatorProjection.pixelYToLatitude(pixelY + deltaPixel, mapSize);
return(Math.Abs(lat2 - lat));
}
