Digital Maps and Geospatial Data | Princeton University

This polygon shapefile contains the boundaries of California Regional Transportation Planning Agencies (RTPA) as of February, 2014. These data were provided by the Division of Transportation Planning, Office of Regional and Interagency Planning.With the exception of Tahoe Regional Planning Agency (TRPA), all of the RTPA boundaries follow county boundaries, some RTPA are multi-county. This layer was created primarily based on 2010 Census county lines excluding the islands. TRPA is actually a bi-state agency created by the U.S. Congress and a compact between California and Nevada. Federal laws and California and Nevada statutes govern it. TRPA is composed of parts of two counties in California, El Dorado and Placer, and two counties in Nevada. The portions of two California counties outside the Tahoe basin are part of the Sacramento Area Council of Governments (SACOG). ). This layer is part of a collection of GIS data created by the California Department of Transportation (Caltrans). This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. California Department of Transportation. (2013). California Regional Transportation Planning Agencies, 2013. California Department of Transportation. Available at http://purl.stanford.edu/rw871gr7791. Data sources: 2010_TIGER_County_Area_MFL and 2010_TIGER_Areawater The coastlines, islands, and the Bay Area were selected from TIGER hydro data, the shapes of some bay and harbor areas are modified using Bing Maps Imagery background, such as San Francisco Bay Area, Dana Point Harbor, Long Beach Harbor, Mission Bay, and San Diego Bay. Reference: CALCOG GUIDE TO REGIONAL PLANNING, AS REVISED BY SB 375 JANUARY 2009. Data Source: The TIGER/Line Shapefile products are not copyrighted however TIGER/Line and Census TIGER are registered trademarks of the U.S. Census Bureau. These products are free to use in a product or publication, however acknowledgement must be given to the U.S. Census Bureau as the source. The boundary information in the TIGER/Line Shapefiles are for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes does not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.Coordinates in the TIGER/Line shapefiles have six implied decimal places, but the positional accuracy of these coordinates is not as great as the six decimal places suggest. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.