Description: The Situs Address Point feature class is a point representation of addresses in Marin County. For the most part, situs addresses are placed on building footprints. The situs address may be different from the mailing address in cases of rental property or where mail is delivered to a post office box. Situs addresses have also been given to some parcels that do not yet have structures built. They have been assigned to some pump stations and water tanks that required addresses for location.The following rules should be adhered to when assigning to non-addressable structures:Number = closest geographical address numberStreet = closest geographical street nameFraction = "1/2"IsDeliverable = 0AddressType = "MISC" (for miscellaneous structures); "COMN" (for common areas)orNumber = building street numberStreet = building street nameIsDeliverable = 0AddressType = "BLDG"
Copyright Text: Marin County Community Development Agency, City Planning and Public Works Departments
Description: ****For original metadata and documentation, please see the Landslides documentation directory**** Landslides data was downloaded from the USGS western region website http://wrgis.wr.usgs.gov/open-file/of97-745/of97-745d.html as an Arc/Info coverage (ma-sef). Coverage was then converted to a shapefile and reprojected to NAD 83 HARN State Plane CA III.
Description: This report presents a preliminary map and database of Quaternary deposits and liquefaction susceptibility for the nine-county San Francisco Bay region, together with a digital compendium of ground effects associated with past earthquakes in the region. The report consists of (1) a spatial database of fivedata layers (Quaternary deposits, quadrangle index, and three ground effects layers) and two text layers (a labels and leaders layer for Quaternary deposits and for ground effects), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map, liquefaction interpretation, and the ground effects compendium, and (4) the databse description pamphlet. The nine counties surrounding San Francisco Bay straddle the San Andreas fault system, which exposes the region to serious earthquake hazard (Working Group on California Earthquake Probabilities, 1999). Much of the land adjacent to the Bay and the major rivers and streams is underlain by unconsolidated deposits that are particularly vulnerable to earthquake shaking and liquefaction of water-saturated granular sediment. This new map provides a modern and regionally consistent treatment of Quaternary surficial deposits that builds on the pioneering mapping of Helley and Lajoie (Helley and others, 1979) and such intervening work as Atwater (1982), Helley and others (1994), and Helley and Graymer (1997a and b). Like these earlier studies, the current mapping uses geomorphic expression, pedogenic soils, and inferred depositional environments to define and distinguish the map units. In contrast to the twelve map units of Helley and Lajoie, however, this new map uses a complex stratigraphy of some forty units, which permits a more realistic portrayal of the Quaternary depositional system. The two colored maps provide a regional summary of the new mapping at a scale of 1:275,000, a scale that is sufficient to show the general distribution and relationships of the map units but cannot distinguish the more detailed elements that are present in the database. The report is the product of years of cooperative work by the USGS National Earthquake Hazards Reduction Program (NEHRP) and National Cooperative Geologic Mapping Program, William Lettis and & Associates, Inc. (WLA) and, more recently, by the California Division of Mines and Geology as well. An earlier version was submitted to the Geological Survey by WLA as a final report for a NEHRP grant (Knudsen and others, 2000). The mapping has been carried out by WLA geologists under contract to the NEHRP Earthquake Program (Grants #14-08-0001-G2129, 1434-94-G-2499, 1434-HQ-97-GR-03121, and 99-HQ-GR-0095) and with other limited support from the County of Napa, and recently also by the California Division of Mines and Geology. The current map consists of this new mapping and revisions of previous USGS mapping.
Copyright Text: Geology by Keith L. Knudsen, Janet M. Sowers, Robert C.
Witter, Carl M. Wentworth and Edward J. Helley. Digital database by Carl M.
Wentworth, Robert S. Nicholson, Heather M. Wright, and Katherine M. Brown
Description: Faults within the County of Marin. Data was received from the Department of Conservation, Division of Mines and Geology Fault Activity Map of California and Adjacent Areas. Data was originally in ArcInfo format and converted to a shapefile. Shapefiles of faults were merged to create one complete shapefile. Data was reprojected from Lambert Conformal Conic Clarke 1866 NAD 27 meters. Attributes were trimmed to show only what was needed for the Marin Countywide Plan Update.
Copyright Text: Department of Conservation, Division of Mines and Geology
Description: A Zip Code is a series of numbers assigned to each delivery area in the United States and used by the Post Office to expedite the sorting and delivery of mail. Data are a graphic representation of Zip Code boundaries in Marin County, California.
Copyright Text: Marin County Community Development Agency