The 'LIDAR' (Light Detection and Ranging) remote sensing technique provides:
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Only colour photographs of terrain
Dense 3D point cloud from laser ranging — used to generate very accurate DEMs, including under vegetation
Soil type classification
Chemical composition of rocks
Correct Answer
B. Dense 3D point cloud from laser ranging — used to generate very accurate DEMs, including under vegetation
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LIDAR: sends laser pulses, measures return time → precise 3D distances. Airborne LIDAR: generates dense point cloud (x, y, z data) for terrain (DTM), buildings, vegetation. Resolution: 1 point/m² to > 100 points/m² depending on altitude and pulse rate. More accurate than photogrammetry for terrain (penetrates vegetation). Used for: DEM generation, flood modelling, powerline mapping.
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