Respectively, Fishery Biologist and Computer Specialist, U.S. Geological Survey, 4512 McMurry Avenue, Fort Collins, Colorado 80525–3400 (E-Mail/Bowen: email@example.com
EVALUATION OF LIGHT DETECTION AND RANGING (LIDAR) FOR MEASURING RIVER CORRIDOR TOPOGRAPHY1
Article first published online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 38, Issue 1, pages 33–41, February 2002
How to Cite
Bowen, Z. H. and Waltermire, R. G. (2002), EVALUATION OF LIGHT DETECTION AND RANGING (LIDAR) FOR MEASURING RIVER CORRIDOR TOPOGRAPHY. JAWRA Journal of the American Water Resources Association, 38: 33–41. doi: 10.1111/j.1752-1688.2002.tb01532.x
Paper No. 01054 of the Journal of the American Water Resources Association.Discussions are open until October 1, 2002.
- Issue published online: 8 JUN 2007
- Article first published online: 8 JUN 2007
- LIDAR - remote sensing;
- instream flow studies;
- aquatic ecosystems;
- watershed management;
- Geographic Information Systems;
ABSTRACT: LIDAR is relatively new in the commercial market for remote sensing of topography and it is difficult to find objective reporting on the accuracy of LIDAR measurements in an applied context. Accuracy specifications for LIDAR data in published evaluations range from 1 to 2 m root mean square error (RMSEx,y) and 15 to 20 cm RMSEz. Most of these estimates are based on measurements over relatively flat, homogeneous terrain. This study evaluated the accuracy of one LIDAR data set over a range of terrain types in a western river corridor. Elevation errors based on measurements over all terrain types were larger (RMSEz equals 43 cm) than values typically reported. This result is largely attributable to horizontal positioning limitations (1 to 2 m RMSEx,y) in areas with variable terrain and large topographic relief. Cross-sectional profiles indicated algorithms that were effective for removing vegetation in relatively flat terrain were less effective near the active channel where dense vegetation was found in a narrow band along a low terrace. LIDAR provides relatively accurate data at densities (50,000 to 100,000 points per km2) not feasible with other survey technologies. Other options for projects requiring higher accuracy include low-altitude aerial photography and intensive ground surveying.