Eastern Geographic Science Center
Description of Current Projects
Detection of Geomorphic Features from Lidar-Derived Topographic Data
Principal Investigator: Daniel Jones, U.S. Geological Survey, Eastern Geographic Science Center
The Science Issue and Relevance
Methodology for Addressing the Issue
Comprehensive channel head and drainage network field surveys are coupled with timely lidar acquisitions to document the occurrence and location of channel heads in watersheds spanning a range of land uses. Lidar-derived channel networks are compared against field survey data to assess accuracy in predicting channel head occurrence and their locations. Terrestrial lidar-based morphometric surveys are used to evaluate channel head morphology and assess which characteristics are apparent or lost in the airborne lidar. Notes and locations of erosional and depositional features are used to assess the variables influencing channel and geomorphic feature detection methods.
Future developments will extend the work into new watersheds to gain further understanding of how the methods perform in a range of topographic and land use settings.
Key Words: Lidar, channel networks, geomorphic feature extraction, Best Management Practices, channel delineation