BC Wildfire PSTA Fire Threat Rating

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Published by the Ministry of Forests, Lands, Natural Resource Operations and Rural Development - BC Wildfire Service
Licensed under Access Only

Provincial Strategic Threat Analysis (PSTA) is designed to consistently assess and map potential wildfire threats to values across the landscape (including communities, infrastructure and natural resources) and to integrate different aspects of wildfire hazard and risk.

This polygon dataset was derived from the PSTA threat rating raster 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 and spotting impact) were combined using a weighted sum process. Weights were assigned as 30% fire density, 60% head fire intensity (90th percentile) 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, head fire intensity, 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 raster and assigned to their own class, -1, which is effectively zero. A private managed forest land and private land mask was applied to the data due to fuel typing limitations in these areas. Each of these were given their own class. private managed forest land is class -2 and private land 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.

Data and Resources

Dataset Extent

Latitude: 48.0° to 60.0°
Longitude: -139.5° to -113.5°

Additional Information

Contact Information

NameDevona Hay (pointOfContact)
EmailBCWILDFIREGEO@gov.bc.ca
OrganizationMinistry of Forests, Lands, Natural Resource Operations and Rural Development
Sub-OrganizationBC Wildfire Service
NameDana Hicks (businessExpert)
EmailDana.Hicks@gov.bc.ca
OrganizationMinistry of Forests, Lands, Natural Resource Operations and Rural Development
Sub-OrganizationBC Wildfire Service

Access & Security

Who can view this dataset? Public
Who can download this dataset?Public

Metadata Information

Record Published 2020-02-05
Record Last Modified 2020-11-03
Resource Status underDevelopment
Spatial DataSDO_GEOMETRY

Object Description

Object Name: WHSE_LAND_AND_NATURAL_RESOURCE.PROT_PSTA_FIRE_THREAT_RTG_SP

Short Name: PROTPSTAFI
Comments: Provincial Strategic Threat Analysis (PSTA) Fire Threat rating represents a subjective best estimate of relative fire threats, taking into account fire occurrence history, predicted fire intensity under extreme conditions, and spotting impact.

Column Name Short Name Data Type Data Precision Comments
PROT_PFTR_SYSID PRT_PFTR_D NUMBER 10 PROT_PFTR_SYSID is a system generated unique identification number.
FIRE_THREAT_CLASS FR_THRT_CS NUMBER 5 A class value signifying the head fire intensity rating from low to extreme. These values directly relate to the text description in the HFI Class Range field, i.e., -3 (No Data (Private Land)), -2 (No Data (Private Managed Forest Land)), -1 (Water), 0 (No Impact), 1 (Low), 2 (Low), 3 (Low), 4 (Moderate), 5 (Moderate), 6 (Moderate), 7 (High), 8 (High), 9 (Extreme), 10 (Exteme).
FIRE_THREAT_CLASS_DESC FR_THRT_CC VARCHAR2 50 Textual descriptions of the class range field signifying the head fire intensity rating from low to extreme, i.e., No Data (Private Land), No Data (Private Managed Forest Land), Water, No Impact, Low, Moderate, High, Extreme.
FEATURE_AREA_SQM FEAT_AREA NUMBER 19 FEATURE_AREA_SQM is the system calculated area of a two-dimensional polygon in square meters.
FEATURE_LENGTH_M FEAT_LEN NUMBER 19 FEATURE_LENGTH_M is the system calculated length or perimeter of a geometry in meters.
SHAPE SHAPE SDO_GEOMETRY 1 SHAPE is the column used to reference the spatial coordinates defining the feature.
OBJECTID OBJECTID NUMBER 38 OBJECTID is a column required by spatial layers that interact with ESRI ArcSDE. It is populated with unique values automatically by SDE.
SE_ANNO_CAD_DATA BLOB 4000 SE_ANNO_CAD_DATA is a binary column used by spatial tools to store annotation, curve features and CAD data when using the SDO_GEOMETRY storage data type.