Continuous coverage which uses a systematic tessellation based on a regular rectified quadrilateral grid to cover its domain, where the elevation property value is usually known...

Area of the Earth's surface where the elevation model is unknown because of missing input data. This area shall be excluded from a DEM.

Elevation TIN

Point spatial object which describes the elevation of an Earth's surface at a specific location. It provides a single elevation property value.

Linear spatial object composed of a set of adjoining locations characterized by having the same elevation property value. It describes, together with other contour lines present...

Delimitation of an area of the Earth's surface where an isolated part of the elevation model exists. Its outside surroundings have no elevation information.

A line of a critical nature which describes the shape of an elevation surface and indicates a discontinuity in the slope of the surface (i.e. an abrupt change in gradient)....