Parent Layer: Biotic Disturbance

Name: Spruce Budworm Defoliation

Display Field: AGENT

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This dataset contains polygons representing the severity of spruce budworm defoliation mapped during annual aerial forest health surveys conducted between 1954 and 2023. Survey responsibility changed over time. Early surveys were conducted and maintained by federal agencies, while responsibility transitioned to the Government of the Northwest Territories (GNWT) Forest Management Division following the transfer of forest management responsibilities in the mid-1990s. Historical survey records from both periods have been compiled into a single spatial dataset. The dataset is survey-based and includes only areas that were assessed during annual aerial surveys. Survey coverage, methodology, and flight paths have varied throughout the record. Earlier surveys may not have followed the same sampling corridors or survey extents used in later years. In more recent decades, survey routes have generally remained consistent from year to year and have focused on major watercourses, transportation corridors, and other forested areas of management interest. Polygons represent areas where spruce budworm defoliation was observed and mapped during surveys. Areas without mapped defoliation should not be interpreted as being free of spruce budworm activity, as they may not have been surveyed during a given year. Defoliation severity is classified according to the following scale: T (Trace) - Minimal, barely visible defoliation L (Light) - Low but noticeable damage M (Moderate) - Significant defoliation S (Severe) - Heavy damage and major foliage loss

Copyright Text: GNWT ECC – Forest Management Division

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MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON

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Extent:

XMin: -1599243.9996999986
YMin: 2192552.101599999
XMax: -723379.3399000019
YMax: 3583653.154199999
Spatial Reference: 102002  (102002)  LatestVCSWkid(0)

Drawing Info:

Renderer:
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Field 2: null
Field 3: null
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  Label: Light
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• Value: S
  Label: Severe
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Labeling Info:

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HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• AGENT ( type: esriFieldTypeString, alias: Agent, length: 6 )
• YEAR ( type: esriFieldTypeInteger, alias: Year )
• SEVERITY ( type: esriFieldTypeString, alias: Severity, length: 1 )
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Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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