Download PDFOpen PDF in browserSpatial Discrepancies between Close-Range Photogrammetry and Terrestrial-LiDAR Models9 pages•Published: December 11, 2023AbstractThis article investigates spatial discrepancies existing between two simple, close-range photogrammetry (CRP) models and a terrestrial light detection and ranging (T-LiDAR) model. The latter is more accurate and serves as benchmark. The commonly modeled zone is a six-acre commercial property. All three models were georeferenced in the same coordinate system before acquiring spatial coordinates of 50 common points from each of them. Two models were produced via CRP, employing Agisoft’s Metashape Professional software, and one, the benchmark model, was generated using Leica Geosystems’ C10 scanner. This laser-based model used Leica’s Visual Alignment procedure for registration purposes. This approach is not the most accurate available today, however, it requires minimal target acquisitions and saves considerable time in the field. One of the CRP models was built with pictures taken from an UAV flying at an approximate 76-ft altitude over ground level. The second CRP model was produced with pictures taken from a 116-ft altitude. Fifty positions and 1,225 distance discrepancies were calculated for each CRP model with respect to the same points and distances acquired from the T-LiDAR model. The compared distances ranged from 0.02 to 415.50 ft. A statistical analysis of those discrepancies is presented in this paper.Keyphrases: close range photogrammetry, distance discrepancy, lidar In: Tom Leathem, Wes Collins and Anthony Perrenoud (editors). Proceedings of 59th Annual Associated Schools of Construction International Conference, vol 4, pages 659-667.
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