Raster datasets include: Digital Elevation Models (DEMs), Orthoimagery, and Land Cover. Lidar point cloud data is also available over many areas of the US. See our Dataset List for a brief explanation of these products.

A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects. DEMs are created from a variety of sources.

What is a Digital Elevation Model (DEM)? A digital elevation model is a bare-earth raster grid referenced to a vertical datum. When you filter out non-ground points such as bridges and roads, you get a smooth digital elevation model.

Sep 10, 2020 · This week we will be looking at the two main models for representing digital elevation data, namely the vector and raster models, as well as the distinction between surface and terrain models. The image above shows DEMSA2 data in both vector and raster data models.

Jul 2, 2024 · Digital Elevation Models (DEMs) have become indispensable tools in various fields, from environmental science to urban planning. These models provide a three-dimensional representation of terrain elevations, offering critical insights for both scientific research and practical applications.

A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid. A "global DEM" refers to a discrete global grid.

2 days ago · A digital elevation model (DEM) is a 3D graphic of the "bare earth" surface of land shown without trees, buildings or other objects. DEMs can be created using traditional topographic maps, modern light detection and ranging (lidar) data and other sources gathered by airborne and space-based instruments.

The most common digital data of the shape of the earth's surface is cell-based digital elevation models (DEMs). This data is used as input to quantify the characteristics of the land surface. A DEM is a raster representation of a continuous surface, usually referencing the surface of the earth. The accuracy of this data is determined primarily ...

Apr 2, 2024 · Digital Elevation Models are indispensable tools for analyzing and understanding the Earth’s surface topography. From urban planning to environmental modelling, DEMs find applications across diverse fields, providing valuable insights into terrain characteristics and spatial relationships.

Learn about DSMs and DTMs. A digital elevation model (DEM) is a representation of elevation data. DEMs are usually generated from remotely sensed data collected by satellites, drones, and planes. A DEM can be a digital surface model (DSM) or a digital terrain model (DTM).