2009050612020800TRUE2009051109582600{176E32AA-C060-477E-8B00-77F112B9234F}1:24,000 County Boundaries (cnty24k09_1)http://projects.atlas.ca.gov/frs/?group_id=41&release_id=2792/200909_1http://frap.cdf.ca.gov/data/frapgisdata/download.asp?rec=cnty24kIn late 1996, the Dept of Conservation (DOC) surveyed state and federal agencies about the county boundary coverage they used. As a result, DOC adopted the 1:24,000 (24K) scale U.S. Bureau of Reclamation (USBR) dataset (USGS source) for their Farmland Mapping and Monitoring Program (FMMP) but with several modifications. Detailed documentation of these changes is provided by FMMP and included in the Process Step section of the Feature Class metadata. A dataset named cnty24k97_1 was made available (approximately 2004) through the California Department of Forestry and Fire Protection - Fire and Resource Assessment Program (CDF - FRAP) and the California Spatial Information Library (CaSIL).
In late 2006, the Department of Fish and Game (DFG) reviewed cnty24k97_1. Comparisons were made to a high-quality 100K dataset (co100a/county100k from the former Teale Data Center GIS Solutions Group) and legal boundary descriptions from ( http://www.leginfo.ca.gov ). The cnty24k97_1 dataset was missing Anacapa and Santa Barbara islands. DFG added the missing islands using previously-digitized coastline data (coastn27 of State Lands Commission origin), corrected a few county boundaries, built region topology, added additional attributes, and renamed the dataset to county24k.
In 2007, the California Mapping Coordinating Committee (CMCC) requested that the California Department of Forestry and Fire Protection (CAL FIRE) resume stewardship of the statewide county boundaries data. CAL FIRE adopted the changes made by DFG and collected additional suggestions for the county data from DFG, DOC, and local government agencies. CAL FIRE incorporated these suggestions into the latest revision, which has been renamed cnty24k09_1. Detailed documentation of changes is included in the Process Step section of the Feature Class metadata.
This Geodatabase contains 3 feature classes representing California county boundaries (arc, polygon, and multipart-polygon feature classes) and also contains a polygon feature class representing the state boundary:
1. Line - can be useful for cartographic purposes, especially when different line symbology is needed for different boundaries (e.g. Coastline, Mexico, Nevada, etc).
2. Multipart - features from a common county are combined into a single record (equivalent to a region feature class in a coverage). May be useful for selections and overlays when all parts of a county are needed.
3. Poly - all county features are represented as indiviudal polygons.
4. State Poly - state boundary polygon to be used for cartography or overlay analysis that requires a state polygon.Ideally, state and federal agencies should be using the same framework data for common themes such as county boundaries. This layer provides an initial offering as "best available" at 1:24,000 scale. Additional improvements, including a review of data sources for the coastline, can be added over time based on interagency review and agreement on proposed changes.EnExtremely detailed descriptions of boundary changes made for different versions are provided in the Process Step metadata section for Feature Classes. More general version notes are provided here;
cnty24k09_1 notes:
This is the first version to be maintained and distributed in geodatabase format. Boundary changes occurred in the following areas;
Ventura-Kern, Ventura-Santa Barbara, Mendocino-Lake-Sonoma, Fresno-Merced, San Bernardino-Riverside, Yuba-Placer-Sutter, Kern-Los Angeles, Orange-Riverside, Orange-Los Angeles, San Francisco, and Santa Barbara (islands).
Also, the multipart feature class was created as a way to group polygons that constitute a single county. Finally, additional attributes were added, e.g. for FIPS codes.File Geodatabase2009051120090511file://\\fphqsan\frap\Transfer\Ron\Metadata\cnty24k08_2 n83.gdbLocal Area NetworkDataset copied.20081021Metadata imported.P:\_GDB_TO_LIB\cnty24k.xml20090506