Name: BC Wildfire PSTA Lightning Fire Density

Display Field: FIRE_START_DENSITY

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This polygon feature class was derived from the lightning caused fire density raster by using the Raster to Polygon conversion tool in ArcGIS 10.3. The following describes how the raster feature class was created.The lightning caused fire density layer was analyzed using lightning caused fires with final sizes greater than 4.0 hectares for the last 67years (1950-2016). These were given a weight of one (1) in the analysis, while large fires (> 500 ha) were given a weight of 5, in order to reflect the much greater cost and damage usually associated with larger fires. A kernel density analysis was conducted to represent the historic fire data as a seamless surface representing fire occurrence across the province; a 10 km search radius was chosen, and the pixel size was 50 m. The ArcGIS kernel density function (v. 10.3; ESRI, Redlands, California, USA) fits a smooth surface to a spatial point frequency dataset, representing actual fire origin points as random samples from a smooth probability surface. The analysis search radius was 10 kilometres and this distance was reflected in the mapped output classes; thus, the fire density at any point on the landscape is a modeled probability value reflecting the number of historic fires found within a radius of 10 kilometres, or within a 314 km2circle around the point of interest. Note that this is different from a simple point density, and the values in the fire density layer classes do not represent the exact numbers of historic fires within the search radius; closer and more clustered fires are weighted higher within that circle, and this can result in significantly higher values than may be expected compared with a simple point search.The output values therefore represent a modeled probability approximately representing the number of nearby fires (4 ha and greater, treating 500+ ha fires as 5 individual events) since 1950. Using this as an input to the Wildfire Threat Analysis layer is based on the premise that areas that were prone to multiple larger fires in the past are likely prone to larger fires in the present and near future.Final class limits are based on the weighting scheme described above: fires from 0 to 4 hectares (not counted, weight of 0); fires from 4.001 to 500 hectares (weight of 1); fires 500.001 hectares or larger (weight of 5). Units are approximate weighted fire frequency within a 10 km radius, 1950-2016.Water bodies were overlaid on the rasterand assignedtheir own class, -1.For more information please see the Provincial Strategic Threat Analysis PSTA Report. Feature class name is 'WHSE_LAND_AND_NATURAL_RESOURCE.PROT_PSTA_LTG_FIRE_ST_DNSTY_SP'. See metadata: https://catalogue.data.gov.bc.ca/dataset/e1ffcf3a-d274-4e6f-a576-a55ce2169b75

Copyright Text:

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 150000.00000000047

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 258537.5001
YMin: 354012.5011
XMax: 1885587.5001
YMax: 1750712.5011
Spatial Reference: 102190  (3005)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: GRIDCODE
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: -1
  Label: Water
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [190, 210, 255, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 0
  Label: No Fires
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [130, 130, 130, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 1
  Label: 1 - 5
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [0, 97, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 2
  Label: 5.1 - 10
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [60, 128, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 3
  Label: 10.1 - 17
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [107, 161, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 4
  Label: 17.1 - 24
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [164, 196, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 5
  Label: 24.1 - 33
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [223, 235, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 6
  Label: 33.1 - 45
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 234, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 7
  Label: 45.1 - 60
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 187, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 8
  Label: 60.1 - 82
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 145, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 9
  Label: 82.1 - 116
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 98, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
• Value: 10
  Label: Greater Than 116
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 34, 0, 255]
  Outline:
  Style: esriSLSNull
  Color: [110, 110, 110, 255]
  Width: 0
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• FEATURE_AREA_SQM ( type: esriFieldTypeDouble, alias: FEATURE_AREA_SQM )
• FEATURE_LENGTH_M ( type: esriFieldTypeDouble, alias: FEATURE_LENGTH_M )
• SHAPE.AREA ( type: esriFieldTypeDouble, alias: SHAPE.AREA )
• SHAPE.LEN ( type: esriFieldTypeDouble, alias: SHAPE.LEN )
• PROT_PLFSD_SYSID ( type: esriFieldTypeInteger, alias: PROT_PLFSD_SYSID )
• GRIDCODE ( type: esriFieldTypeSmallInteger, alias: GRIDCODE )
• FIRE_START_DENSITY ( type: esriFieldTypeString, alias: FIRE_START_DENSITY, length: 30 )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

  Iteminfo   Thumbnail   Metadata