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Interpreters used 2005 National Agricultural Imagery Program (NAIP) color digital orthophoto imagery with 1/2-meter spatial resolution to delineate land use zones, producing a statewide land use polygon layer for 2005. The photo interpretation was conducted in 2006. Minor corrections were made to this layer during the 2014 Development Zone Project updates carried out in 2015-2016.Land Use Zone DefinitionsWildland Forest: Zone 1Polygon is >=640 acres.Polygon has <=4 developments per 640 acres.The developments are generally scattered across the polygon.The polygon is >80% forest land, and the remainder is agricultural or "other" land except for the developments.Wildland Range: Zone 2 (Eastern Oregon Only)Polygon is >=640 acres.Polygon has <=4 developments per 640 acres.The developments are generally scattered across the polygon.The polygon is <51% forestland.Agricultural lands are <20% of the polygon.The remainder is undeveloped rangeland.Alternately, the polgon is >=50% rangeland, agricultural lands are <20% of the polygon, and wildland forest makes up the remainder.Mixed Forest/Agriculture: Zone 5Polygon is >=640 acres.This zone contains forest, range, and "other" lands intermingled with agricultural land. It also includes lightly forested areas where livestock grazing is suspected as a regular use of the understory.Polygon has <9 developments per 640 acres.The developments are generally scattered across the polygon.Agricultural land comprises 20% to 80% of the polygon, and the remainder is forest or "other" land except for the developments. Forest land is >=50% of the remainder.Improved road patterns are generally 0.5mile or greater.Mixed Range/Agriculture: Zone 6 (Eastern Oregon Only)Polygon is >=640 acres.This zone contains rangeland and agricultural land.Polygon has <9 developments per 640 acres.The developments are generally scattered across the polygon.Agricultural land comprises 20% to 80% of the polygon.The undeveloped portion (i.e., non-agricultural land) is <51% forestland.Improved road patterns are generally 0.5 mile or greater.Intensive Agriculture: Zone 7Polygon is >=640 acres.Polygon has <9 developments per 640 acres.The developments are generally scattered across the polygon.Agricultural land occupies >80% of the polygon, and the remainder is forest or "other" lands except for the developments.Low-Density Residential: Zone 8Polygon can be any size, but must have >=9 developments within it.The average acreage per development is generally less than 80 acres.Improved road patterns are typically 0.25 mile or less.The residential lot size is generally greater than 1 acre.This zone can also be a polygon that meets urban qualifications, but is less than 40 acres in size.Urban: Zone 9Polygon is >=40 acres.This is a commercial, service, and residential subdivided area with city road patterns and closely spaced buildings.Single-home residential developments generally have lot sizes less than 1 acre.If the following are adjacent to, or within 0.25 mile of an urban zone, they must be included in the urban zone: golf courses, industrial parks, airports, maintained parks, mills or other industrial complexes, quarries, dams. However, if these are not within 0.25 mile of an urban zone and are >=40 acres, they are classified as a low-density residential area. If not within 0.25 mile of an urban zone and <40 acres, they are absorbed into the surrounding zone.Other: Zone 10Non-vegetated areas/large bodies of water >=640 acres.This zone contains only lava, sand, reservoirs, lakes, rivers, and mountain-top rock/snow.Development/Structure Count Notes"Developments" include individual buildings and/or clusters of buildings, which may or may not be related to the management of the land they are on.Each house/dwelling is considered a development, but a cluster of barns, storage sheds, garages, and other associated buildings is collectively considered as a single development.County tax parcel layers were used for reference, when available, in counting developments. There is generally zero or one development per parcel. If multiple structures are present within a single parcel, that parcel generally has one development counted regardless of the total number of structures.When interpreting developments for delineation of land use zones, "development" means developments not related to the usage of that zone. For example, when delineating an agricultural zone, farm houses do not count toward the number of developments per 640 acres. Zone Connectivity NotesIn areas where dominant land use is not clustered and easily defined, a number of different zones can be intermingled. In these instances, a maximum distance of 0.25 mi through other zones is used in zone delineation: in order to include a parcel or section of land in a zone, it must be within 0.25 mi of that zone."Stringers" are defined as any long, narrow section of a zone. Stringers must be less than 0.25 mi in length. A minimum width of 120 feet is required for all sections of a zone.Zones were drawn by county, therefore individual polygons may be under minimum acreage requirements if the zone continues across a county line.
requirements if the zone continues across a county line.
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