ABOUT

This project was developed out of research by University of California Cooperative Extension Specialists Luke Macaulay and Van Butsic at UC Berkeley’s Department of Environmental Science, Policy and Management Department.

UC Agriculture and Natural Resources Informatics and GIS Statewide Program developers Shane Feirer, Robert Johnson, and Andy Lyons developed the interface and website. The project was funded through a grant associated with the Renewable Resource Extension Act (RREA) administered by the U.S. Department of Agriculture’s National Institute of Food and Agriculture (NIFA).

Data:

Land cover data is derived from the USDA Cropland Data Layer

Ownership data: Parcel data was assembled for all 58 California counties. Parcel data with ownership information for 49 counties was derived from Boundary Solutions Inc., with the remaining nine counties assembled by contacting individual county governments. These county parcel data sets came from varying years, with 49 counties from 2011 to 2015 and nine counties from 2005 to 2010.

After assembling county parcel maps for the entire state, we then dissolved parcels by owner name within each county to remove interior borders of parcels owned by the same entity in the county and to calculate total area under each ownership. After this effort approximately 8% of the state had unknown ownership, so the authors overlaid three separate ownership maps that cover public land and conservation easements to assign ownership to parcels that did not have ownership information from original parcel data (CCED 2015; CDFFP 2014; CPAD 2015). This process reduced unknown ownership to approximately 2.7% of California's total land area (∼2.85 million acres). Ownership information has been left anonymous. The final ownership map was composed of approximately 543,495 properties greater than 5 acres across the state of California.

This study excluded properties smaller than 5 acres under the assumption that properties of less than 5 acres were not oriented towards production agriculture. Ownership statistics are heavily skewed to many small properties and few very large properties, and as such, acreage statistics are greatly affected by the cutoff value of the minimum size of cropland ownership (in this case 5 acres). Raising or lowering the minimum size property in the dataset increases or decreases the mean and median statistics correspondingly.

Researchers interested in collaborating to perform additional analyses of this ownership map can contact Luke Macaulay and Van Butsic.

Data download: Underlying ownership data in a format that can be read by the free statistical program R may be downloaded at this link. Metadata showing the year of the parcel data for each county’s information are provided below. These data only include properties that are greater than 5 acres.

Ownership boundaries are not intended to reflect legal rights, boundaries, and definitions. The data, information, and maps provided herein are part of a research project and are derived from various sources that do not guarantee accuracy, with errors possible in property lines. The Regents of the University of California (“the Regents”) and the developers of this site make no warranty, representation or guarantee as to the content, accuracy, timeliness or completeness of any of the information contained implied herein, and shall not be responsible for any errors or omissions. By using this site and the information contained on this site, you hereby release the Regents and developers of the site from any and all claims resulting from your use of this site or results obtained from the use of this information; and you agree to indemnify, defend and hold harmless the Regents and the developers of this site from and against any and all claims, liabilities, losses and expenses (including reasonable attorneys' fees) arising out of your use of this site and the information contained on this site.

County FIPS Year
Alameda60012015
Alpine60032008
Amador60052010
Butte60072014
Calaveras60092013
Colusa60112014
Contra Costa60132014
Del Norte60152014
El Dorado60172014
Fresno60192015
Glenn60212015
Humboldt60232011
Imperial60252011
Inyo60272011
Kern60292015
Kings60312014
Lake60332014
Lassen60352014
Los Angeles60372011
Madera60392013
Marin60412015
Mariposa60432005
Mendocino60452014
Merced60472015
Modoc60492010
Mono60512011
Monterey60532015
Napa60552011
Nevada60572013
Orange60592013
Placer60612010
Plumas60632014
Riverside60652014
Sacramento60672010
San Benito60692015
San Bernardino60712014
San Diego60732015
San Francisco60752012
San Joaquin60772015
San Luis Obispo60792011
San Mateo60812012
Santa Barbara60832015
Santa Clara60852012
Santa Cruz60872014
Shasta60892015
Sierra60912014
Siskiyou60932008
Solano60952012
Sonoma60972015
Stanislaus60992010
Sutter61012015
Tehama61032015
Trinity61052014
Tulare61072014
Tuolumne61092011
Ventura61112009
Yolo61132012
Yuba61152012

Citations:

Macaulay, L.T. & V. Butsic. 2017. Ownership characteristics and crop selection in California cropland. California Agriculture 71(4):221-230.

CCED [California Conservation Easement Database]. California Protected Areas Data Portal 2015. www.calands.org/cced (accessed Apr. 28, 2016)

CDFFP [California Department of Forestry and Fire Protection]. FRAP – CAL FIRE Ownership Download 2014. http://frap.fire.ca.gov/data/frapgisdata-swownership13_2_download (accessed Apr. 28, 2016)

CPAD [California Protected Areas Database]. California Protected Areas Data Portal 2015. www.calands.org/data (accessed Apr. 28, 2016)

Website created by the UC ANR Informatics and GIS Statewide Program