Johnson, S.Y., Greene, H.G., Manson, M.W., Hartwell, S.R., Endris, C.A., and Watt, J.T., 2014, Geology and geomorphology--Offshore of Bolinas Map Area, California:.This is part of the following larger work.
Cochrane, Guy R., Dartnell, Peter, Johnson, Samuel Y., Greene, H. Gary, Erdey, Mercedes D., Golden, Nadine E., Hartwell, Stephen R., Mansion, Michael W., Sliter, Ray W., Endris, Charles A., Watt, Janet T., Ross, Stephanie L., Kvitek, Rikk G., Phillips, Eleyne L., Bruns, Terry R., and Chin, John L., 2015, California State Waters Map Series--Offshore of Bolinas Map Area, California: Open-File Report OFR 2015-1135, U.S. Geological Survey, Reston, VA.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is WGS 1984 UTM Zone 10N.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.0001
Ordinates (y-coordinates) are specified to the nearest 0.0001
Planar coordinates are specified in Meter
The horizontal datum used is D WGS 1984.
The ellipsoid used is WGS 1984.
The semi-major axis of the ellipsoid used is 6378137.0.
The flattening of the ellipsoid used is 1/298.257223563.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
|Qms||Marine nearshore and shelf deposits|
|Qmss||Marine shelf scour depressions|
|Qmsc||Coarse-grained marine nearshore and shelf deposits|
|Qmsb||Marine ebb-tidal bar deposits|
|Qms/Tp||Thin marine sediment sheet overlies Purisima Formation|
|Qms/Tsc||Thin marine sediment sheet overlies Santa Cruz Mudstone|
|Tsc||Santa Cruz Mudstone|
|Tu||Tertiary sediments, undivided|
|KJf||Franciscan Complex, undivided|
text description of map unit
Positive real numbers that are automatically generated.
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To expand geologic mapping to the seafloor within the California's State Waters, to update coastal geologic mapping, and to contribute to a uniform regional geologic database, which can be used geographic information systems. Additionally, to provide a geologic map for the public and geoscience community to aid in assessments and mitigation of geologic hazards in the Bolinas coastal region and to provide sufficient geologic information for land-use and land-management decisions both onshore and offshore. This information is not intended for navigational purposes.
Dartnell, Peter, Kvitek, Rikk G., and Bretz, Carrie K., 2013, Bathymetry--Offshore of Bolinas Map Area, California: Data Series DS 781, U.S. Geological Survey, Reston, VA.
Dartnell, Peter, Erdey, Mercedes, Kvitek, Rikk G., and Bretz, Carrie K., 2013, Bathymetry--Offshore of Bolinas Map Area, California: Data Series DS 781, U.S. Geological Survey, Reston, VA.
U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP), 2013, Chirp and High-Resolution Mini-Sparker Seismic data of field activity L-1-06-SF in Offshore Golden Gate, San Francisco County, CA from 09/25/2006 to 10/03/2006: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG), Menlo Park, CA.
U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP), 2013, Subbottom survey data of field activity S-8-09-NC in Stinson Beach to Point Arena (CA) from 09/08/2009 to 09/30/2009: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG), Menlo Park, CA.
Polygons were primarily mapped by one
of the following methods: (1) interpretation of 2-meter-resolution hillshaded bathymetry data from sonar surveys (see Bathymetry Hillshade--Offshore Bolinas, California, California, DS 781, for more information); (2) interpretation of 2-meter-resolution amplitude (backscatter)
data from bathymetric sonar surveys (see BackscatterA_8101_2004; BackscatterB_8101_2007; BackscatterC_7125; and BackscatterD_Snippets; and Backscatter E_Swath--Offshore Bolinas, California, DS 781, for more information); (3) interpretation of 2-meter
interpretation of seismic-reflection-profile data (see field activities S-8-09-NC and L-1-06-SF).
Map Unit contact locations were interpreted typically at a scale of between 1:1,000 and 1:2,000 using the above base data. Bathymetric sonar data have a horizontal accuracy greater than the resolution of the base data.
Map unit contacts were digitized by heads-up screen digitization of line data on 2-meter-resolution DEMs described above. Horizontal accuracy is estimated to be between 2 and 5 meters depending on how clearly contacts can be resolved.
Most digitized positions on the map are estimated to have better than 5 m horizontal accuracy. There is no elevation data in the database.
Data are complete: no offshore features that could be accurately identified and represented at the compilation scale of 1:24,000 were eliminated or generalized. The smallest area represented is approximately 100 square meters. All geospatial database elements are attributed.
Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the lead authors and by the GIS technician(s) who created the digital database. Review drafts of the map were reviewed internally by at least two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards.
Are there legal restrictions on access or use of the data?
- If physical samples or materials are available, constraints on their on-site access are described in "WR CMG Sample Distribution Policy" at URL: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
- This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
(650) 329-4309 (voice)
These databases, identified as bathymetry and shaded-relief maps of Offshore Bolinas map area, California have been approved for release and publication by the U.S. Geological Survey (USGS). Although these databases have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
These data are not intended for navigational use.
|Data format:||The .zip file for a shapefile includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as the text (.txt) and XML (.shp.xml) versions of the metadata for the Geology data layer of Offshore Bolinas, California. in format SHP (version ArcMap (version 10.0, ESRI , 2011)) Point, line, and polygon features are in shapefile format and are projected in UTM Zone 10 coordinates, with datum WGS84. Size: 1.1|
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap SHP. Users should download the ArcGIS Project File, OffshoreBolinasGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for "Offshore Bolinas" and has all the data symbolized as on the OFR map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.