DTM

DTM, or Digital Terrain Model, is a digital representation of the Earth's surface that captures its natural features like hills, valleys, and slopes. Unlike maps that use lines and symbols, a DTM uses a grid of data points with elevation values, created from survey data or remote sensing technology such as LiDAR or photogrammetry. It helps in geographic and engineering analyses by providing accurate, detailed surface information for applications like flood modeling, infrastructure planning, and environmental management. Essentially, a DTM acts as a precise 3D map of the ground surface, excluding features like buildings and trees.