Look for complete geospatial metadata in this layer's associated xml document available from the download link


* Metric Name: Unarmored threespine stickleback Habitat  

* Tier: 3  

* Data Vintage: 2021  

* Unit Of Measure: Binary layer, 1 represents potential habitat  

* Metric Definition and Relevance: This is a dataset representing the boundaries for the Unarmored threespine stickleback ( _Gasterosteus aculeatus williamsoni_ ) as understood by the United States Fish and Wildlife Service. This subspecies is only found in the Southern California Region.  

* Creation Method: Contains the current range polygons as contained in the ECOS database; no generalization was performed and no data was intentionally omitted. Polygons are created by field staff utilizing the ECOS system to select range per office. The office datasets are then dissolved into one species range file and simplified using the Douglas-Peucker algorithm with a 0.0001 tolerance. The polygons were then transformed to a binary 30m raster layer. The polygons were then transformed to a binary 30m raster layer, where 1 represents potential habitat.  

* Credits: U.S. Fish and Wildlife Service (USFWS), Ecological Services Division