digital terrain models

A Digital Terrain Model (DTM) is a computer-based representation of the Earth's surface's pure terrain, showing elevation data without including objects like buildings or trees. It's created using measurements from surveys, satellites, or airborne surveys. DTMs are used in various fields such as geography, engineering, and environmental planning to analyze landform features, plan infrastructure, and model water flow. Essentially, a DTM provides a detailed, accurate map of the terrain's shape, enabling professionals to understand and work with the Earth's surface systematically and precisely.