CACOAST is a coastline for the central California region between San Francisco and Point Sur. This file is a subset of the original data extracted from 1:24,000-scale maps by the California State Lands Commission.
This is one of a collection of digital files of a geographic information system of spatially referenced data related to the USGS Coastal and Marine Geology Program "Monterey Bay National Marine Sanctuary Project" <http://walrus.wr.usgs.gov/mbms>. The data were collected and analyzed between 1994 and 2000.
Fukushima, Ted, and Wong, Florence L. , 2001, CACOAST - coastline for central California from San Francisco to Point Sur:.This is part of the following larger work.Online Links:
Wong, F.L., and Eittreim, S.E., 2001, Continental Shelf GIS for the Monterey Bay National Marine Sanctuary: U.S. Geological Survey Open-File Report 01-179, U.S. Geological Survey, Menlo Park, CA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 1.0
Ordinates (y-coordinates) are specified to the nearest 1.0
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is GRS1980.
The semi-major axis of the ellipsoid used is 6378137.0.
The flattening of the ellipsoid used is 1/298.257.
The polygons in the coverage CACOAST are identified in the attribute PTYPE. The values for PTYPE are 'sea' or 'land'. There are polygons interior to 'land' (e.g., lakes) that are not separately identified.
The arcs in the coverage CACOAST are identified in the attribute LTYPE. The values for LTYPE are 'coastline' or 'scratch'.
NOTES ACCOMPANYING ORIGINAL FILES:
Name: California coastline FS Name: COASTN27 DATE: 2 Aug 1994 DESCRIPTION: Note: This coverage is a rebuild of the original digitized data with greatly reduced tolerances (see below). The purpose of this rebuild is to reduce the number of verticies that are dropped out during an ARCINFO "CLEAN" process on a previous version of this coverage. This data set closely resembles the original data, and as such, users will probably want to generalize this coverage to decrease unwanted verticies and arcs. California shoreline from the Oregon border to the Mexico border including Humboldt, Arcata, San Francisco, San Pablo, Suisun, Honker, and San Diego Bays and includes offshore rocks. This shoreline represents the mean high tide line along the coast and bays as shown on the US Geological Survey 7.5' series quadrangles. Vital STATISTICS: Datum: NAD 27 Projection: Albers Units: Meters 1st Std. Parallel: 34 00 00 2nd Std. Parallel: 40 30 00 Longitude of Origin: -120 00 00 Latitude of Origin: 00 00 00 False Easting (X shift): 0 False Northing (Y shift): -4,000,000 Source: US Geological Survey (Various years) Source Media: mylar, paper Source Projection: Lambert Source Units: meters, feet Source Scale: 1:24,000 Capture Method: Manual digitization Conversion Software: ARC/INFO rev. 5.0.1, 6.1.2 Data Structure: Vector ARC/INFO Coverage type: line, point ARC/INFO tolerances: Fuzzy: .001 Weed: .02 - .006 Number of features: 28786 arcs, 12150 points Layer Size: 66.844 MB Date updated: July 1994 DATA DICTIONARY: There is only standard attribute information for the PAT and AAT files. DATA QUALITY ASSESSMENT: The following are subjective comments regarding this data. This coverage has been compiled from individually digitized 7.5' USGS quadrangles controlled by NGS triangulation stations and individual quad corners. RMS errors averaged under 5 meters per quad. Accuracy of this coverage is very good with respects to the original source material. The shoreline between the Mare Island and Cuttings Wharf quads did not match. The Cuttings Warf quad was completed in 1949 and the Mare Island quad was completed in 1959. The differences were assumed to have resulted from the the different mapping dates. Consequently, the shoreline of the quad with the later date, the Mare Island quad, was held and the shoreline of the Cuttings Wharf quad was manually adjusted to fit. Not all of the quadrangles were current, since we could not afford new mylar sets. You will find some differences between our shoreline and the most recent USGS quadrangles. This shoreline will be updated on an ongoing basis. The marine terminal facility known as Pacific Wharf situated on the east side of San Pablo Bay alongside the main channel of the bay and west of the Unocal's Wharf at Oleum (Mare Island Quad), was positioned from registered and rectified air photos. The method used to position the facility was as follows: 1. The scanned air photo was registered with the coastline coverage then rectified; 2. The facility was then digitized in arcedit with a mouse from the registered and rectified scanned air photo. DATA CONTACT: Contact Name: Ted Fukushima Contact Agency: State Lands Commission Contact's Phone: 916-322-7813 --NOTICE-- This map and/or data has been prepared for reconnaissance and general information purposes only. The map and/or data has not been approved by the State Lands Commission and does not constitute an official map or dataset of the Commission, nor does it establish the boundary lines of any State owned lands depicted on the map or described in the data. The map and/or data is preliminary, is based upon readily information, and is subject to revision as the need arises. Any republication or other distribution of this map and/or data, by any means whatsoever, must include this disclaimer.
Florence L. Wong
United States Geological Survey (USGS)
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA
(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov
These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information about the shallower areas of the Monterey Bay National Marine Sanctuary.
Fukushima, Ted, and California State Lands Commission, 1994, California coastline COASTN27.
Polygons are 'land' include everything that is not 'sea', so lakes are not separately identified.
Polygon and chain-node topology present.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- None
- Use_Constraints:
- Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
United States Geological Survey (USGS)
c/o Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA
(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov
USGS Open-File Report 01-179
Please recognize the U.S. Geological Survey (USGS) as the source of this information.Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
| Data format: | coastline vectors in format ArcInfo (version 8.0.2) Size: 10 Mb |
|---|---|
| Network links: |
<http://geopubs.wr.usgs.gov/open-file/of01-179/> |
United States Geological Survey (USGS)
c/o Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA
(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov
