public async override Task <ElevationData> GetDemXYZ(int x, int y, int z)
{
lock (_object) // thread safe bitmap lookup contention. Todo use thread safe readonly list
{
y = MapUtil.FlipY(y, z);
// Get the lat lon boundary from xyz tile
var rect = Geographic.TileXYToRectangleLL(x, y, z);
// Make the DEM that will be used to make a quantized mesh
return(MakeTileDEM(rect));
}
}