Full formTechnology
DEMstands forDigital Elevation Model
Full Form of DEM
What is DEM?
A Digital Elevation Model (DEM) is a 3D computer graphics representation of a terrain's surface, created from elevation data. In India, DEMs are extensively used by the Indian Space Research Organisation (ISRO) and the Survey of India for mapping, flood modeling, infrastructure planning, and environmental monitoring. They are derived from satellite remote sensing data such as that from Cartosat-1 and the Shuttle Radar Topography Mission (SRTM). DEMs are critical for GIS-based analysis in agriculture, urban planning, and disaster management, especially in disaster-prone regions like the Himalayas and coastal areas. They appear in competitive exams like UPSC, GATE, and state civil services under geography, remote sensing, and environmental science. Understanding DEMs helps in interpreting landforms, watershed analysis, and terrain roughness. The data is available at various resolutions (e.g., 30m, 10m) through platforms like Bhuvan and USGS Earth Explorer. DEMs differ from Digital Surface Models (DSMs) as they represent bare earth before vegetation or structures are added.
DEM का फुल फॉर्म
डिजिटल एलिवेशन मॉडल
Example
The National Remote Sensing Centre (NRSC) recently released a high-resolution DEM for Kerala to aid post-flood landslide risk assessment.
DEM — frequently asked questions
What is the full form of DEM?
The full form of DEM is Digital Elevation Model, a 3D representation of terrain elevation used in GIS and remote sensing.
How is DEM used in India for disaster management?
DEM helps model flood inundation, landslide susceptibility, and coastal erosion. ISRO uses it for early warning systems in flood-prone regions like Assam and Bihar.
Which Indian exams ask about DEM?
Competitive exams such as UPSC Geography, GATE Remote Sensing, and state forest service exams include questions on DEM applications in terrain analysis and cartography.