Photogrammetric surveys generally involve capturing high resolution image data from a camera. The data is processed using dedicated photogrammetry software that analyses the overlapping photographs, matching key points to produce 3D data. An orthomosiac can be generated by orthorectifying the raw image data, mosiacing the image into a single georeferenced image. Photogrammetric data can either be captured aerially by mounting a camera to an unmanned aerial vehicle (UAV) or by close range photography using a hand held or tripod camera. Aerial photogrammetry is used to create 3D topographical mapping data, whereas close range photogrammetry is used to create a 3D model of a close object such as a structure. The key benefits of a photogrammetric survey are: • Minimising ground access to the site • Rapid data capture compared to traditional survey techniques • Acquisition of geo referenced, high resolution site photographs Deliverables • Pont clouds LAS, LAZ, PLY, XYZ • 3D textured mesh DXF, FBX, OBJ, PLY, 3D PDF • DSM and Othomosiac GeoTIFF, XYZ, LAS, LAZ

Photogrammetry

NRG Engineering Services Ltd Land and Engineering Surveyors