Name: BC Wildfire PSTA Spotting Impact

Display Field: SPOTTING_IMPACT_CLASS_DESC

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This polygon feature class was derived from the spotting impact raster by using the Raster to Polygon conversion tool in ArcGIS 10.3. The following describes how the raster feature class was created.Spotting was modeled by fuel type and by distance class from a given fuel type pixel. The risk of spotting within a given pixel was analyzed based on the risk presented by the surrounding fuel pixels, with distance radii based on fuel type. Distance class categories were analyzed as concentric circles around the target fuel patch, with higher ranking values associated with shorter distances, and with more volatile fuel types. The chance of spotting was considered to be “nil” for distances over two kilometres.Spotting values represent the estimated threat associated with 12 relevant fuel type-distance classes. The relative threat associated with each fuel type-distance class was ranked (“Spotting Rank”), based on expert opinions on the most frequent spotting concerns observed during wildfires. The rank values were assigned risk scores (weighting factor), which were adjusted to normalize the areas (since the larger concentric circles cover much more area than smaller ones). Each raster pixel (50 metre resolution) was then assigned a total score based on the sum of risk values contributed by all pixels within a radius of 1-2 kilometres. Based on this total score, the landscape was categorized into 10 spotting classes ranging from low to extreme.The classes were created by automatic classification, using the “natural breaks (Jenks)” setting of the ArcGIS 10.1 Spatial Analyst extension. Differences are caused by fuel type classes and distances, with no consideration given at this time to elevation or dominant wind direction. Future versions of this analysis will likely address both of these factors.Water bodies were overlaid on the rasterandassigned their own class, -1. A private managed forest land (PMFL) and private land (PL) mask was applied to the data due to fuel typing limitations in these areas. Each of these were given their own class. PMFL is class -2 and PL is class -3.For more information please see the Provincial Strategic Threat Analysis PSTA Report. Feature class name is 'WHSE_LAND_AND_NATURAL_RESOURCE.PROT_PSTA_SPOTTING_IMPACT_SP'. See metadata: https://catalogue.data.gov.bc.ca/dataset/62be8626-4768-45b6-adec-265fab94e061

Copyright Text:

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

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Spatial Reference: 102190  (3005)

Drawing Info:

Renderer:
Unique Value Renderer:
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Field 2: N/A
Field 3: N/A
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Labeling Info:

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Type ID Field: null

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