Skip to Main Content
Mapping river bathymetries: Evaluating topobathymetric LiDAR surveyAuthor(s): Daniele Tonina; James A. McKean; Rohan M. Benjankar; C. Wayne Wright; Jaime R. Goode; Qiuwen Chen; William J. Reeder; Richard A. Carmichael; Michael R. Edmondson
Source: Earth Surface Processes and Landforms. 44(2): 507-520.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
Download Publication (3.0 MB)
DescriptionAdvances in topobathymetric LiDARs could enable rapid surveys at sub-meter resolution over entire stream networks. This is the first step to improving our knowledge of riverine systems, both their morphology and role in ecosystems. The Experimental Advanced Airborne Research LiDAR B (EAARL-B) system is one such topobathymetric sensor, capable of mapping both terrestrial and aquatic systems. Whereas the original EAARL was developed to survey littoral areas, the new version, EAARL-B, was also designed for riverine systems but has yet to be tested. Thus, we evaluated the ability of EAARL-B to map bathymetry and floodplain topography at sub-meter resolution in a mid-size gravel-bed river. We coupled the EAARL-B survey with highly accurate field surveys (0.03m vertical accuracy and approximately 0.6 by 0.6m resolution) of three morphologically distinct reaches, approximately 200m long 15m wide, of the Lemhi River (Idaho, USA). Both point-to-point and raster-to-raster comparisons between ground and EAARL-B surveyed elevations show that differences (ground minus EAARL-B surveyed elevations) over the entire submerged topography are small (root mean square error, RMSE, and median absolute error, M, of 0.11 m), and large differences (RMSE, between 0.15 and 0.38m and similar M) are mainly present in areas with abrupt elevation changes and covered by dense overhanging vegetation. RMSEs are as low as 0.03m over paved smooth surfaces, 0.07m in submerged, gradually varying topography, and as large as 0.24m along banks with and without dense, tall vegetation. EAARL-B performance is chiefly limited by point density in areas with strong elevation gradients and by LiDAR footprint size (0.2 m) in areas with topographic features of similar size as the LiDAR footprint.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationTonina, Daniele; McKean, James A.; Benjankar, Rohan M.; Wright, C. Wayne; Goode, Jaime R.; Chen, Qiuwen; Reeder, William J.; Carmichael, Richard A.; Edmondson, Michael R. 2019. Mapping river bathymetries: Evaluating topobathymetric LiDAR survey. Earth Surface Processes and Landforms. 44(2): 507-520.
Keywordstopobathymetric LiDAR, streambed bathymetry, performance of green LiDAR
- Improving stream studies with a small-footprint green lidar
- Remote sensing of channels and riparian zones with a narrow-beam aquatic-terrestrial LIDAR
- Chapter 2: Stream and riparian habitat analysis and monitoring with a high-resolution terrestrial-aquatic LiDAR
XML: View XML