Evaluating survey instruments and methods in a steep channel
| Autor: | Ellen E. Daugherty, Katherine B. Lininger, Daniel N. Scott, Daniel J. Brogan, Derek M. Schook, Annette I. Patton, Matthew S. Sparacino |
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| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
0208 environmental biotechnology 02 engineering and technology Kinematics 01 natural sciences 020801 environmental engineering Survey methodology GNSS applications Laser rangefinder Geology 0105 earth and related environmental sciences Earth-Surface Processes Remote sensing Communication channel |
| Zdroj: | Geomorphology. 273:236-243 |
| ISSN: | 0169-555X |
| Popis: | Methods for surveying and analyzing channel bed topography commonly lack a rigorous characterization of their appropriateness for project objectives. We compare four survey methods: a hand level, two different methods of surveying with a laser rangefinder, and a real-time kinematic GNSS (RTK-GNSS) to explore their accuracy in determining channel bed slope and roughness for a study reach in a small, dry, steep channel. Additionally, we evaluate the variability among four operators for each survey technique. Two methods of calculating reach slope were computed: a regression on the channel profile and a calculation using only survey endpoints. Using data from the RTK-GNSS as our accuracy reference, the hand level and two-person laser rangefinder surveying systems performed with high accuracy ( |
| Databáze: | OpenAIRE |
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