| Summary: | This dataset contains a shapefile (rivers_sasap_final.zip) of the rivers of Alaska, grouped by the regional boundaries of the State of Alaska's Salmon and People (SASAP) project. This is a relatively lightweight file useful for visualization, even at high resolution. Note that because of the aggregation process, this dataset does not contain information on river names or other characteristics. The intermediate file shapefile sasap_rivs_connected_large.zip was generated originally to calculate river distance between points, and is topologically correct. The source data for this dataset comes from the United States Geological Survey (USGS) Hydrographic Geodatabase - Alaska, One Million-Scale Dataset (https://nationalmap.gov/small_scale/atlasftp.html) and the Riverscape Analysis Project river's database (to get Canadian data only). These two datasets were pre-processed using CanadaRAPclip.ipynb and QGIS, creating the larger intermediate shapefile (sasap_rivs_connected_large.zip). This shapefile was joined with a SASAP region shapefile (Jared Kibele. 2018. State of Alaska's Salmon and People Regional Boundaries. Knowledge Network for Biocomplexity. doi:10.5063/F1J964NZ), geometries were simplified and then aggregated by region and stream order using rivers_preprocessing.R More information on the Riverscape Analysis Project is available here: Diane C. Whited , John S. Kimball , John A. Lucotch , Niels K. Maumenee ,Huan Wu , Samantha D. Chilcote & Jack A. Stanford (2012) A Riverscape Analysis Tool Developed to Assist Wild Salmon Conservation Across the North Pacific Rim, Fisheries, 37:7,305-314, DOI: 10.1080/03632415.2012.696009.
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