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Layer: Wildland-Urban Interface (ID:0)

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Name: Wildland-Urban Interface

Display Field: Id

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Oregon's wildland-urban interface (WUI) is the geographic area where structures and other human development meets or intermingles with wildland or vegetative fuels, and specific criteria and definitions for the WUI are detailed in OAR 629-044-1011. To support Oregon's wildfire programs, Oregon State University (OSU) was directed to develop a statewide map of the WUI. Creating a statewide map of the WUI involved two general steps. First, we determined which parts of Oregon met the minimum building density requirements to be classified as WUI. Second, for those areas that met the minimum building density threshold, we evaluated the amount and proximity of wildland or vegetative fuels. OAR 629-044-1011 specifies that all areas within an urban growth boundary are considered WUI, regardless of the structure density. For areas outside an urban growth boundary, the rule specifies there must be a density of at least one structure per 40 acres. To identify areas that meet the minimum structure density, OSU scientists mapped all structures in Oregon using the Statewide Building Footprint of Oregon (SBFO) data developed by the Oregon Dept. of Geology and Mineral Industries (Williams, 2021). We excluded all building footprints less than 400 square feet. We assigned each building to a tax lot and simplified down to a single building per tax lot. Other human development is generally included within the SBFO data since they are typically buildings, but to be sure that other human development was specifically accounted for we added additional point data that meet the definition of other human development, and which were available from Homeland Security. After other human development point locations were added to the simplified SBFO data, we calculated the density in ArcGIS using a search radius of 744.73 ft. A density of 1 building per 40 acres based on this search radius results in a density of 0.025 buildings per acre. To remove isolated properties, we assessed building density using a search radius of 746 ft. (1.25 feet wider), which equates to an area just larger than 40 acres (40.14 acres). By doing so, isolated properties had a density of 0.024915 structures per acre which is just below the density threshold. Any structures that did not meet or exceed the density threshold were removed from consideration within the WUI boundary based on building density alone. After mapping the potential WUI based on building density, we added all UGB polygons to the map using the most recent data available which was current through April 2020. UGB data was provided by the Department of Land Conservation and Development. The WUI is also defined by the density and proximity of wildland and vegetative fuels (“fuels"). By including density and proximity of fuels in the definition of the WUI, the urban core is excluded, and the focus is placed on those areas with sufficient building density and sufficient fuels to facilitate a WUI conflagration. Vegetative and wildland fuels were mapped using LANDFIRE data updated to current conditions (LANDFIRE 2.0) and adjusted with input from regional fire and fuels professionals. Areas that met the minimum building density threshold described above and which had at least 50% vegetative or wildland fuel cover were classified as Intermix WUI. Interface WUI includes areas that met the minimum building density threshold in step one, and which had less than 50% vegetative and/or wildland fuel cover but were within 1.5 miles of a large patch (≥ 2 sq. miles) of at least 75% vegetation and/or wildland fuels. Occluded WUI includes areas that met the minimum building density threshold in step one, and which had less than 50% vegetative and/or wildland fuel cover but were within 1.5 miles of a moderate patch (1 – 2 sq. miles) of at least 75% vegetation and/or wildland fuels. All three types of WUI were combined into a single polygon geometry delineating the statewide WUI. REFERENCES: Williams, M.C., 2021. Statewide Building Footprints for Oregon, Release 1.0 (No. SBFO-1), Digital Data Series. Oregon Dept. of Geology and Mineral Industries, Portland, OR.

Copyright Text: Data developed by Chris Dunn and Andy McEvoy at Oregon State University (osuwildfirerisk@oregonstate.edu).

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Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

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Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

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Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 6/1/2024 8:35:31 PM

Schema Last Edit Date: 6/1/2024 8:35:31 PM

Data Last Edit Date: 5/31/2024 7:00:49 PM

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