Terrain elevation

Free. Terrain height from the Copernicus DEM GLO-30 at a point (lat+lon) or over an area (bbox): min, max, mean, median, p10, p90 and relief (max-minus-min). Use POST for a polygon, whose statistics cover only the samples inside the ring. A SURFACE model (buildings and canopy included), ~30 m posting, heights orthometric on EGM2008. Land only: no coverage over open ocean is reported as absence, never as 0 m. The response carries the required attribution; cite it wherever a height is shown.