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SENSOR FUSION : GENERATING 3 D BY COMBINING AIRBORNE AND TRIPOD-MOUNTED LIDAR DATA

Laser scanning provides structural and topographic detail previously unheard of. When conducting a LIDAR survey, however, it can be difficult or even impossible to collect measurements on all surfaces of a structure. Since LIDAR works under ‘line-of-sight’ principles, laser shadowing can be a significant issue. But since LIDAR sensors are available on several different platforms, sensor fusion can provide the means to generate complete, accurate solid models. Airborne laser scanners collect accurate georeferenced topographic data of large areas very quickly, while tripod-mounted laser scanners generate very dense, geometrically accurate data. Used in tandem, these scanners make it possible to generate complete solid models that are geometrically accurate on all surfaces. This paper documents the processing and fusing of airborne and tripod-mounted scanner data. The survey used an Optech Airborne Laser Terrain Mapper (ALTM) and an Optech ILRIS-3D laser scanner to survey Toronto City Hall in Toronto, Canada. The final product was a fused data set that represented the entire structure and its surrounding grounds.