Abstract: Session B 10:50 am (Back to Session B)
Using Aerial LiDAR to Assess Stream Restoration Project Sites
Civil & Environmental Consultants, Inc.
Aerial LiDAR (Light Detection and Ranging) is becoming more popular as people realize its utility. LiDAR is an efficient and economical remote sensing method for stream restoration. Approximately thirty states have at least partial statewide LiDAR coverage available for public download. Conversion of LiDAR point clouds to digital elevation models (DEMs) can aid the fieldwork, delineation, design, and construction phases of stream restoration projects in many ways. Creation of flow accumulation models from LiDAR DEMs accurately depict drainage areas and aid in delineation and design phases. These flow accumulation grids are often more detailed than USGS StreamStats, and drainage area thresholds can be manipulated to show ephemeral and intermittent headwater streams. Slope models are created and used to identify headwater stream channels, logging roads, trails, landslides, rock outcrops, and anthropogenic disturbances that may affect projects. It is important to understand how vertical and horizontal accuracy of LiDAR data can affect surfaces created for design purposes. This presentation will focus on acquiring publically available LiDAR data, identifying the types of datasets available, data processing techniques, and using LiDAR DEMs and point clouds for stream restoration projects.