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Layer: BC Wildfire PSTA Fire Threat Rating (ID: 775)

Name: BC Wildfire PSTA Fire Threat Rating

Display Field: FIRE_THREAT_CLASS_DESC

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This polygon feature class was derived from the PSTA threat ratingraster by using the Raster to Polygon conversion tool in ArcGIS 10.3. The following describes how the raster feature class was created.The three described data layers (fire density, head fire intensity (HFI) and spotting impact) were combined using a weighted sum process. Weights were assigned as 30% fire density, 60% HFI (90thpercentile) and 10% spotting impact. These weighted values were added together to produce a final fire threat analysis value ranging theoretically between zero to 100. Although the classification scheme theoretically ranged from zero to 100, the highest value in the data was 81. The classes were then scaled to balance out the distribution of values while still maintaining meaningful thresholds of fire density, HFI, and spotting at higher levels. Areas with a final value of zero consisted of areas that had no record of wildfire, were typed as non-fuel (such as alpine rock, glaciers and ocean areas), and were too distant to be at risk of spotting from nearby fuels. Other very low values could occur due to zero values in one or two of the three categories, such as areas of flammable fuels with no record of a large fire burning nearby (i.e. fire density equals zero) or non-fuel areas that are only at a slight risk of spotting. Water bodies were overlaid on the rasterand assigned to their own class, -1, which is effectively zero. 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.The weighting system integrated the three identified components of fire threat: fire occurrence (fire density); suppression effort and fire impacts (head fire intensity); and spotting. The results of the final Wildfire Threat Analysis were then assigned to 10 classes to produce a detailed map of fire threats throughout British Columbia. These 10 classes represent a subjective best estimate of relative fire threats, taking into account fire occurrence history, predicted fire intensity under extreme conditions, and spotting impact. For more information please see the Provincial Strategic Threat Analysis PSTA Report. Feature class name is 'WHSE_LAND_AND_NATURAL_RESOURCE.PROT_PSTA_FIRE_THREAT_RTG_SP'. See metadata: https://catalogue.data.gov.bc.ca/dataset/e533ff3c-0a19-4137-af04-cce631aab9ba

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