Baseline High Resolution Land Cover Map for the Mainstem Klamath River Corridor Downstream of Iron Gate Dam, Klamath River, CA, 2018

This data release includes a file geodatabase with land cover maps for a 313-kilometer segment along the mainstem Klamath River corridor downstream from Iron Gate Dam, CA. The maps were derived from high-resolution (15cm) imagery and topobathymetric elevation data, collected by NV5 Geospatial (formerly QSI, Inc) and published on Open Topography (https://doi.org/10.5069/G9DN436N). Acquisition dates spanned 06/01/2018 to 06/14/2018. The area of interest was discretized into three zones and land cover maps were generated using geoprocessing tools, implemented in ArcMap 10.8.1, and image classification tools, implemented in Ecognition 10.2. The maps include six land cover classes: 1) trees, 2) shrubs, 3) grass, 4) bare ground, 5) rock outcrop and 6) water. Water was defined by a lidar hydrobreak raster product. Trees, shrubs and grass were classified using a lidar-derived canopy height model and threshold values in vegetation indices. The bare ground and rock outcrop classes were further classified using a random forest classifier. A total of 639 independent reference points were used in an accuracy assessment. The overall accuracy of the Level II classification (all 6 classes) is 87%. The overall accuracy of the Level I classification [ 6) water, 7) vegetation (trees, shrubs, grass) and 8) unvegetated (bare ground, rock outcrop) ] is 95.1%. See attached Klamath_AccuracyAssessment.csv for more details. The file geodatabase includes land cover maps for three zones. Zone A covers Iron Gate Dam to Fort Goff. Zone B covers Fort Goff to Somes Bar. Zone C covers Somes Bar to the estuary. The USGS Integrated Water Availability Assessments (IWAAs) Program and the USGS National Land Imaging Program funded generation of these high-resolution digital products.