| High-precision field surveying was conducted in Columbia, South Carolina for an accuracy assessment of 3-dimensional data extracted from Pictometry and LiDAR (Light Detection and Ranging) imagery. This field work was subdivided into planimetric (x,y) and vertical (z) elevation data obtained utilizing a survey grade GPS and a surveyors tape for ground truth. X, Y, and Z data extracted from Pictometry and LiDAR data were then compared to this high precision (sub-centimeter) field reference data to determine RMSE and Accuracyz (NSSDA accuracy at the 95% confidence level). Measurements were partitioned into five categories: LiDAR ground elevations, Pictometry ground elevations, LiDAR height measurements, Pictometry height measurements, and Pictometry distance measurements. The RMSE of LiDAR ground elevations was 10.90 cm with an Accuracyz of 21.36 cm. Pictometry ground elevations had an RMSE of 139.24 cm and Accuracyz of 272.91 cm. LiDAR height measurements had an RMSE of 14.09 cm and Accuracyz of 27.60 cm. Pictometry height measurements had an RMSE of 81.98 cm and Accuracyz of 160.68 cm. Pictometry distance measurements had an RMSE of 21.49 cm and Accuracyz of 42.12 cm. |
