Abstract

Stream Channel Mapping in SW Ohio Using LiDAR
Track: Water Resources
Authors: Robbyn Abbitt

LiDAR data is providing new opportunities for quick and efficient stream channel mapping. In SW Ohio, we studied the validity of using LiDAR data in place of field surveys. In Spring 2007, LiDAR was collected for all Ohio and made publicly available. We extracted stream cross-sections from the derived bare-earth DEM using 3D Analyst in ArcMap 9.3.1. We also conducted field surveys of stream channel geometry. Comparison of field surveys to LiDAR cross-sections indicate a strong correlation in streams that are heavily incised and had little flow in Spring 2007. To assist with future use of LiDAR, we suggest a list of criteria for using the Ohio LiDAR for extracting stream cross-sections. Researchers attempting to use LiDAR for stream cross-sections will benefit from this study. We do conclude that while LiDAR provides a quick understanding of stream channel geometry, it does not eliminate the need for field verification and observations.