This dataset represents the data derived from the NLCD dataset and the National Hydrography Dataset version 2.1(NHDPlusV2) within individual local and accumulated upstream catchments for NHDPlusV2 Waterbodies (See Supplementary Info for Glossary of Terms). Attributes were calculated for every local NHDPlusV2 catchment and accumulated to provide watershed-level metrics for agricultural classes (classes 81 and 82) within the NLCD on DEM-derived slopes >10% and >20%.

        Catchment boundaries in LakeCat are defined in one of two ways, on-network or off-network. The on-network catchment boundaries follow the catchments provided in the NHDPlusV2 and the metrics for these lakes mirror metrics from StreamCat, but will substitute the COMID of the NHDWaterbody for that of the NHDFlowline. The off-network catchment framework uses the NHDPlusV2 flow direction rasters to define non-overlapping lake-catchment boundaries and then links them through an off-network flow table.

        This data set is derived from the NLCD raster composed of 16 land cover classes (categorical data type) for the conterminous USA. 2 classes were isolated to represent apricultural land cover. This raster was produced based on a decision-tree classification of circa 2006 Landsat satellite data.

        Included with NHDPlusV2 is the National Elevation Dataset (NED) which was used to create 2 slope rasters to find areas with slope >10% and >20%.  These rasters were used as masks to locate areas where NLCD agricultural classes (classes 81 and 82) occur on slopes >10% and >20%.