The Tamalpais Lands Collaborative (One Tam; https://www.onetam.org/), the network of organizations that manage lands on Mount Tamalpais in Marin County, initiated the countywide mapping project with their interest in creating a seamless, comprehensive map depicting vegetation communities across the landscape. With support from their non-profit partner the Golden Gate National Parks Conservancy (https://www.parksconservancy.org/) One Tam was able to build a consortium to fund and implement the countywide fine scale vegetation map.Development of the Marin fine-scale vegetation map was managed by the Golden Gate National Parks Conservancy and staffed by personnel from Tukman Geospatial (https://tukmangeospatial.com/) Aerial Information Systems (AIS; http://www.aisgis.com/), and Kass Green and Associates. The fine-scale vegetation map effort included field surveys by a team of trained botanists. Data from these surveys, combined with older surveys from previous efforts, were analyzed by the California Native Plant Society (CNPS) Vegetation Program (https://www.cnps.org/vegetation) with support from the California Department of Fish and Wildlife Vegetation Classification and Mapping Program (VegCAMP; https://wildlife.ca.gov/Data/VegCAMP) to develop a Marin County-specific vegetation classification.High density lidar data was obtained countywide in the early winter of 2019 to support the project. The lidar point cloud, and many of its derivatives, were used extensively during the process of developing the fine-scale vegetation and habitat map. The lidar data was used in conjunction with optical data. Optical data used throughout the project included 6-inch resolution airborne 4-band imagery collected in the summer of 2018, as well as 6-inch imagery from 2014 and various dates of National Agriculture Imagery Program (NAIP) imagery.In 2019, a 26-class lifeform map was produced which serves as the foundation for the much more floristically detailed fine-scale vegetation and habitat map. The lifeform map was developed using expert systems rulesets in Trimble Ecognition®, followed by manual editing.In 2019, Tukman Geospatial staff and partners conducted countywide reconnaissance fieldwork to support fine-scale mapping. Field-collected data were used to train automated machine learning algorithms, which produced a fully automated countywide fine-scale vegetation and habitat map. Throughout 2020, AIS manually edited the fine-scale maps, and Tukman Geospatial and AIS went to the field for validation trips to inform and improve the manual editing process. In the spring of 2021, draft maps were distributed and reviewed by Marin County's community of land managers and by the funders of the project. Input from these groups was used to further refine the map. The countywide fine-scale vegetation map and related data products were made public in June 2021. In total, 107 vegetation classes were mapped with a minimum mapping size of one fifth to one acre, varying by class.Accuracy assessment plot data were collected in 2019, 2020, and 2021. Accuracy assessment results were compiled and analyzed in the summer of 2021. Overall accuracy of the lifeformmap is 95%. Overall accuracy of the fine-scale vegetation map is 77%, with an overall 'fuzzy' accuracy of 81%.The Marin County fine-scale vegetation map was designed for a broad audience for use at many floristic and spatial scales. At its most floristically resolute scale, the fine-scale vegetation map depicts the landscape at the National Vegetation Classification alliance level - which characterizes stands of vegetation generally by the dominant species present. This product is useful to managers interested in specific information about vegetation composition. For those interested in general land use and land cover, the lifeform map may be more appropriate. Tomake the information contained in the map accessible to the most users, the vegetation map is published as a suite of GIS deliverables available in a number of formats. Map products are being made available wherever possible by the project stakeholders, including the regional data portal Pacific Veg Map (http://pacificvegmap.org/data-downloads).

CDFW BIOS GIS Dataset, Contact: Matt Sagues, Description: This is a vegetation map of the Marin County Open Space District Lands. It was produced in 2008 by Aerial Information Systems using hi-resolution (1') natural color imagery provided by the County of Marin, acquired by Vargis (date unknown).

Data are a graphic representation of County Service Area boundaries in Marin County, California.

Trails data were created for the Marin Countywide Plan update. Data was compiled from various sources including: Digitized from Marin County's existing trails maps, data from Tomales Bay State Park, data from Bay Trail, data from Marin County Parks and Open Space, data from Marin Municipal Water District, and data from GGNRA. Accuracy of data may vary. Trails have been rectified when possible to orthophotography and checked for accuracy by David Hansen of Marin County Parks and Open Space. Areas with tree coverage are not orthorectified and will not be as accurate. There is still much clean up work to be done on this data. The attributes of ID are reflective of the original county trail mylar map legend where: 1 = Paved Path, Trail Proposed 2 = Paved Path, Trail Right of Way Secured 3 = Paved Path, Trail Open to Public 4 = Combined Use, Trail Proposed 5 = Combined Use, Trail Right of Way Secured 6 = Combined Use, Trail Open to Public 7 = Equestrian/Hiking, Trail Proposed 8 = Equestrian/Hiking, Trail Right of Way Secured 9 = Equestrian/Hiking, Trail Open to Public 10 = Hiking Only, Trail Proposed 11 = Hiking Only, Trail Right of Way Secured 12 = Hiking Only, Trail Open to Public 0 = Unknown, Data came from other source

The zoning map is a composite of zoning designations adopted as resolutions by the Marin County Board of Supervisors. Data extend over Assessor parcel boundaries in the unincorporated area of Marin County, California. The Zoning map denotes the spatial extent of land use designations defined in the Countywide Plan.

Tax rate area boundaries and related data based on changes filed with the Board of Equalization per Government Code 54900 for the specified assessment roll year. The data included in this map is maintained by the California State Board of Equalization and may differ slightly from the data published by other agencies. BOE_TRA layer = tax rate area boundaries and the assigned TRA number for the specified assessment roll year; BOE_Changes layer = boundary changes filed with the Board of Equalization for the specified assessment roll year; Data Table (C##_YYYY) = tax rate area numbers and related districts for the specified assessment roll year

description: The Digital Geologic Map of the Marin Headlands and Point Reyes Areas, California is composed of GIS data layers complete with ArcMap 9.3 layer (.LYR) files, two ancillary GIS tables, a Map PDF document with ancillary map text, figures and tables, a FGDC metadata record and a 9.3 ArcMap (.MXD) Document that displays the digital map in 9.3 ArcGIS. The data were completed as a component of the Geologic Resources Inventory (GRI) program, a National Park Service (NPS) Inventory and Monitoring (I&M) funded program that is administered by the NPS Geologic Resources Division (GRD). Source geologic maps and data used to complete this GRI digital dataset were provided by the following: USGS and California Geological Survey. Detailed information concerning the sources used and their contribution the GRI product are listed in the Source Citation sections(s) of this metadata record (mhpr_metadata.txt; available at http://nrdata.nps.gov/goga/nrdata/geology/gis/mhpr_metadata.xml). All GIS and ancillary tables were produced as per the NPS GRI Geology-GIS Geodatabase Data Model v. 2.1. (available at: http://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm). The GIS data is available as a 9.3 personal geodatabase (mhpr_geology.mdb), and as shapefile (.SHP) and DBASEIV (.DBF) table files. The GIS data projection is NAD83, UTM Zone 10N. That data is within the area of interest of Golden Gate National Recreation Area, Point Reyes National Seashore and Muir Woods National Monument.; abstract: The Digital Geologic Map of the Marin Headlands and Point Reyes Areas, California is composed of GIS data layers complete with ArcMap 9.3 layer (.LYR) files, two ancillary GIS tables, a Map PDF document with ancillary map text, figures and tables, a FGDC metadata record and a 9.3 ArcMap (.MXD) Document that displays the digital map in 9.3 ArcGIS. The data were completed as a component of the Geologic Resources Inventory (GRI) program, a National Park Service (NPS) Inventory and Monitoring (I&M) funded program that is administered by the NPS Geologic Resources Division (GRD). Source geologic maps and data used to complete this GRI digital dataset were provided by the following: USGS and California Geological Survey. Detailed information concerning the sources used and their contribution the GRI product are listed in the Source Citation sections(s) of this metadata record (mhpr_metadata.txt; available at http://nrdata.nps.gov/goga/nrdata/geology/gis/mhpr_metadata.xml). All GIS and ancillary tables were produced as per the NPS GRI Geology-GIS Geodatabase Data Model v. 2.1. (available at: http://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm). The GIS data is available as a 9.3 personal geodatabase (mhpr_geology.mdb), and as shapefile (.SHP) and DBASEIV (.DBF) table files. The GIS data projection is NAD83, UTM Zone 10N. That data is within the area of interest of Golden Gate National Recreation Area, Point Reyes National Seashore and Muir Woods National Monument.

These files contain building outline products for Marin County. The project encompasses the Urban/Suburban land area of Marin County with a 200 feet fringe outside the county boundary. The Digital Terrain Models (DTM) data developed over the Urban/Suburban area mainland covers approximately 210 square miles and over the rural and forest areas covering approximately 525 sq. miles to produce the 100 scale and 400 scale mapping Contours and Ortho Imagery. Builiding footprint outlines cover the same extent as the DTM. Building footprints were produced using stereo pairs from the 2004 orthophoto project to ensure that the on ground bases were captured, and are accurately depicted against a backdrop of the orthophoto sources. Additional footprintswere digitized from 2014 orthophoto as could be seen without tree cover. Many erroneous footprints from 2004 vintage were deleted.

GIS data layer which provides a graphic representation of County Service Area boundaries in Marin County, California.

Tax rate area boundaries and related data based on changes filed with the Board of Equalization per Government Code 54900 for the specified assessment roll year. The data included in this map is maintained by the California State Board of Equalization and may differ slightly from the data published by other agencies. BOE_TRA layer = tax rate area boundaries and the assigned TRA number for the specified assessment roll year; BOE_Changes layer = boundary changes filed with the Board of Equalization for the specified assessment roll year; Data Table (C##_YYYY) = tax rate area numbers and related districts for the specified assessment roll year

The data in this feature layer is pulled from a PG&E REST service.

Tax rate area boundaries and related data based on changes filed with the Board of Equalization per Government Code 54900 for the specified assessment roll year. The data included in this map is maintained by the California State Board of Equalization and may differ slightly from the data published by other agencies. BOE_TRA layer = tax rate area boundaries and the assigned TRA number for the specified assessment roll year; BOE_Changes layer = boundary changes filed with the Board of Equalization for the specified assessment roll year; Data Table (C##_YYYY) = tax rate area numbers and related districts for the specified assessment roll year

Marin county-wide geology compiled from four USGS publications and 2004 topographic mapping - Open-File Report (1997) OFR97-456 for Point Reyes and the San Andreas Fault Zone, 1:48000 - Miscellaneous Field Study (2000) MF-2337 for parts of Marin, San Francisco, and Contra Costa counties, 1:75000 - portion of Miscellaneous Field Study (2005) MF-2402 for northernmost Marin and western Sonoma counties, 1:62500 - portion of Scientific Investigations Map (2007) SIM-2956 for eastern Sonoma county, 1:62500

Groundwater Basins for Marin County. Data was downloaded from http://gis.ca.gov/data_index.epl and reprojected from NAD 27 meters. Attributes not needed for the Countywide Plan were deleted.

In 2015, under contract to the Marin Municipal Water district (MMWD), Aerial Information Systems, Inc. (AIS) conducted the photo interpretation of sudden oak death (SOD) affected vegetation stands for the Mt. Tamalpais Watershed Forest and Woodlands Project. They looked at 2014 imagery and used the 2009 remap layer to reclassify stands which had changed over the past 5 years, these stands were changed mostly due to SOD. The mapping study area consists of approximately 18,986 acres of Marin county. Work was performed on the project in 2015 by using the 2014 imagery to mark changes in vegetation. The primary purpose of the project was to find areas where vegetation had changed because of SOD and to show where gaps were formed by fallen oak trees. There was a total of 99 mapping classes. Vegetation with field questions map class is not symbolized in the cartography.CNPS under separate contract and in collaboration with CDFW VegCAMP developed the floristic vegetation classification used for the project. The floristic classification follows protocols compliant with the Federal Geographic Data Committee (FGDC) and National Vegetation Classification Standards (NVCS).The 2009 vegetation map was updated applying heads-up digitizing techniques using a 2014 base of 6-inch resolution, natural color imagery provided by MMWD, in conjunction with custom ArcGIS tools that AIS developed to update the existing 2009 database. Mapped polygons were assessed for change in Vegetation Type as a result of SOD. More information can be found in the project report which is bundled with the BIOS vegetation map.

Elementary, middle, high school and college sites in Marin County. Both public and private schools are included.Updated February 2020 using dataset supplied by Marin County Office of Education

This shapefile contains tax rate area (TRA) boundaries in Marin County for the specified assessment roll year. Boundary alignment is based on the 2014 county parcel map. A tax rate area (TRA) is a geographic area within the jurisdiction of a unique combination of cities, schools, and revenue districts that utilize the regular city or county assessment roll, per Government Code 54900. Each TRA is assigned a six-digit numeric identifier, referred to as a TRA number. TRA = tax rate area number

A sphere of influence is a plan adopted by LAFCo for the probable physical boundaries and service areas of a city or special district. Recreation District Sphere of Influence is a topologically correct polygon representation of sphere of influence boundaries of the recreation districts of Marin County.

The Road feature class is a line representation of vehicle and pedestrian access ways in Marin County. It includes roads, fire roads, service roads, driveways, trails, walkways, railroad lines and docks. The Road feature class was originally created from a query of the Census TIGER file for these access types. Features were edited to align to visible features on the 2004 Marin County digital Orthophoto and have been updated as needed.

Data are a graphic representation of Sewer district boundaries in Marin County, California.