This dataset provides a map that shows contours for likely flood extent related to elevation within a watershed. The files were generated using a commonly accepted approach to terrain-based analyses for determining flood extent, called Height Above Natural Drainage (HAND), to analyze terrain information in the dataset . The complete 126 file set includes watersheds based on the national HUC-12 (Hydrologic Unit Code). Files are named using the unique HUC-12 code identifier used by the US Geological Survey (https://water.usgs.gov/GIS/huc.html). Each datafile is formatted as a raster GeoTIFF derived from 1-meter LIDAR https://tnris.org/stratmap/elevation-lidar/ Datasets were generated using the HAND-TauDEM workflow that can be accessed publicly in a github repository at https://github.com/dhardestylewis/HAND-TauDEM Files were processed using open-source software, including TauDEM and Python GIS libraries. Data was discretized in one foot intervals (1 ft ~= 0.3048 m) in order to reduce file size (see separate dataset for raw Height Above Nearest Drainage). (2021-03-25)
