Central Coast Joint Data Committee: Links to open data portals for Central California
Data.gov: Open datasets from the U.S. Government, including maps and spatial data
Science.Gov: Portal for selected science information from U.S. Government agencies, including GIS datasets
USGS GIS Data: Spatial and geographic data
USDA Geospatial Data Gateway: Environmental and natural resources data
National Historical Geographic Information System: U.S. Census data tables and mapping files
Natural Earth: Public domain vector and raster map data, including physical and cultural geographic features
Big Ten Academic Alliance Geoportal: Access to GIS datasets and digitized historical maps
TopoView: Provides USGS topographic maps in a variety of formats.
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