DTM

A Digital Terrain Model (DTM) is a three-dimensional representation of the Earth's bare surface that captures accurate ground elevations after removing buildings, trees, and other above-ground features. Unlike surface models, DTMs focus solely on the underlying terrain, making them ideal for precise elevation analysis. They are generated using technologies such as LiDAR, photogrammetry, drone surveys, and satellite imagery. DTMs serve as a foundational dataset in Geographic Information Systems (GIS), remote sensing, civil engineering, and environmental management. They enable detailed terrain analysis by providing information on slope, aspect, contours, watersheds, drainage networks, and landforms. These models support a wide range of applications, including urban and infrastructure planning, road and railway design, flood modeling, watershed management, mining, agriculture, forestry, and disaster risk assessment. By delivering highly accurate terrain data, DTMs improve spatial analysis, predictive modeling, and decision-making, making them an essential resource for modern geospatial projects.