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Digital Terrain Model (DTM) Presentation

This presentation provides a foundational overview of Digital Terrain Models (DTMs) and their essential role in producing accurate geospatial products, including orthophotos, elevation models, and 3-D land surface representations. It explains the differences between rectified and orthorectified imagery, the importance of DTMs in correcting relief displacement, and the role of photogrammetry, LiDAR, and IFSAR in terrain data generation. The material highlights common error sources, quality-control practices, and elevation modeling methods such as DEMs, TINs, point clouds, and break lines. The presentation underscores how accurate elevation data supports land administration, surveying, infrastructure design, disaster response, and national development.