Accession Number : ADA601990
Title : Use of LiDAR to Assist in Delineating Waters of the United States, Including Wetlands
Descriptive Note : Final rept.
Corporate Author : ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
Personal Author(s) : Gillrich, Jennifer ; Lichvar, Robert
Report Date : Mar 2014
Pagination or Media Count : 74
Abstract : During preliminary delineations of an Ordinary High Water Mark (OHWM) boundary, LiDAR data or products may be used to view the OHWM signature across a project area and to estimate the height and location of two primary OHWM indicators: changes in vegetation and breaks in slope. At this time, most LiDAR data or products cannot detect changes in sediment texture. The point spacing, horizontal resolution, and vertical accuracy of the data or products determine if landscape features, such as the OHWM break in slope, can be measured with sufficient accuracy. All information gathered from LiDAR data or products should be verified in the field. During the preliminary, data-gathering stage of wetland delineations, LiDAR data and products may be used to view vegetative, topographic, and hydrologic patterns across a project area and to focus the investigation on transitional areas. They cannot provide evidence of hydrophytic vegetation or hydric soils. Although LiDAR intensity data may provide information on inundation extent, they contain no information regarding inundation frequency or duration and should not be used as a primary hydrology indicator. Intensity data collected during the growing season could be used as a secondary indicator of wetland hydrology. LiDAR data or products are not an adequate substitute for a field investigation.
Descriptors : *OPTICAL RADAR , *WETLANDS , MAPPING , TOPOGRAPHY , VEGETATION
Subject Categories : Cartography and Aerial Photography
Optical Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE