Sources of digital elevation mode

Digital Elevation Model (DEM) is a digital representation of terrain elevation data that is used in a wide range of applications, including hydrology, cartography, environmental modeling, and 3D visualization. DEMs are constructed from various sources, including remote sensing data, topographic maps, LiDAR (Light Detection and Ranging) data, and stereo photogrammetry. In this article, we will explore these sources in more detail.

1. Remote Sensing Data: Remote sensing involves the use of satellites, aircraft, and drones to capture data about the earth's surface. Satellite-based remote sensing platforms, such as ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) and SRTM (Shuttle Radar Topography Mission), have been used to ________ _________ ___ _____ __________ _______ _______ ________ ______ _________.
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