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The California Air Districts layer is a polygon shapefile coverage representing the California air pollution control and air quality management districts, as defined in federal and state law. See 40 CFR, Chapter I Section 81, et seq., and California Health and Safety Code, Section 40000 et seq. Shapefile coverage. This data layer shows the air district boundaries and their names as of October 2009. The file has been updated using as main source the: California Environmental Protection Agency Air Resources Board maps (http://www.arb.ca.gov/capcoa/dismap.htm).

The California Air Basins layer is a polygon shapefile coverage representing the 15 California air basins, as defined in state statute and regulation. See the California Health and Safety Code, Section 39606 et seq. and California Code of Regulations, Title 17, Section 60100 et seq. Shapefile coverage. This data layer shows the air basin boundaries and their names, as of October 2009. The file has been updated using as main source the: California Environmental Protection Agency Air Resources Board maps (http://www.arb.ca.gov/knowzone/basin/basin.htm)

This file has the Airport/Airfield geometric centroids and was produced from the Dynamap(R)/Transportation Airports

This dataset is one from a series of district layers pertaining to California Assembly Districts, that are derived from the California State Assembly information. The following district layer is included in the series: assembly_districts: Current California Assembly Districts based on the new district boundaries enacted into state law on September 13, 2001, and signed into law on September 26, 2001 for use with the March 2002 primary election. The boundary file has not been changed since.

This is a GIS shapefile reflecting the bike routes in Orange County

Census Blocks for 2000

The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB).

Bus Routes in SCAG in 2007

This dataset is preliminary and was developed by combining the 2010 city boundaries for the cities of: Jurapa Valley and Eastvale, with the 2009 boundaries for the rest of the cities in the SCAG region. The dataset is comprised of data collected from each of the 6 counties contained within the SCAG region. The data represents the city boundary for each of the 191 cities in the region. Data was obtained from county representatives between April and May 2009 to reflect the most current updates and annexations to the city boundaries. The original data sources were the local LAFCO offices

This dataset is one from a series of district layers pertaining to California Congressional Districts, that are derived from the California State Senate information. All data layers are reprojected in UTM projection. The following district layer is included in the series: congressional districts: Current California Congressional Districts based on the new district boundaries enacted into state law on September 13, 2001, and signed into law on September 26, 2001 for use with the March 2002 primary election. The boundary has not been changed since then.

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