This data layer represents a comprehensive countywide update to the 2021 major open spaces GIS data layer and map. In 2021, a new category was added, and polygons for each municipality were verified by their respective government officials (75% of municipalities responded with edits). There are 13 open space categories, including many smaller properties not previously mapped. Properties classified as Farms derived from the Westchester County Agricultural District established in 2000. The information used to compile the data came from a variety of sources including aerial photography, digital tax parcel data, local recreation, land use, and master plan maps. Other sources included municipal planning departments and consultants, conservation committees, and the Westchester Land Trust. In 2025, some edits were made to properties in North Salem, Mount Kisco, and Rye.