{ "currentVersion": 10.91, "id": 192, "name": "Spruce Budworm Defoliation", "type": "Feature Layer", "description": "This dataset contains polygons representing the severity of spruce budworm defoliation mapped during annual aerial forest health surveys conducted between 1954 and 2023.\n\n\nSurvey 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.\n\n\nThe 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.\n\n\nPolygons 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.\nDefoliation severity is classified according to the following scale:\n\n T (Trace) - Minimal, barely visible defoliation\n\n L (Light) - Low but noticeable damage\n\n M (Moderate) - Significant defoliation\n \nS (Severe) - Heavy damage and major foliage loss", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102002, "latestWkid": 102002 }, "copyrightText": "GNWT ECC \u2013 Forest Management Division", "parentLayer": { "id": 191, "name": "Biotic Disturbance" }, "subLayers": [], "minScale": 0, "maxScale": 0, "drawingInfo": { "renderer": { "type": "uniqueValue", "field1": "SEVERITY", "field2": null, "field3": null, "defaultSymbol": null, "defaultLabel": null, "uniqueValueInfos": [ { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 56, 168, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 255 ], "width": 0.4 } }, "value": "L", "label": "Light", "description": "" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 255, 255, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 255 ], "width": 0.4 } }, "value": "M", "label": "Moderate", "description": "" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 230, 0, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 255 ], "width": 0.4 } }, "value": "S", "label": "Severe", "description": "" } ], "fieldDelimiter": "," }, "transparency": 0, "labelingInfo": null }, "defaultVisibility": true, "extent": { "xmin": -1599243.9996999986, "ymin": 2192552.101599999, "xmax": -723379.3399000019, "ymax": 3583653.154199999, "spatialReference": { "wkid": 102002, "latestWkid": 102002 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "AGENT", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": [ { "name": "OBJECTID", "type": "esriFieldTypeOID", "alias": "OBJECTID", "domain": null }, { "name": "AGENT", "type": "esriFieldTypeString", "alias": "Agent", "length": 6, "domain": null }, { "name": "YEAR", "type": "esriFieldTypeInteger", "alias": "Year", "domain": null }, { "name": "SEVERITY", "type": "esriFieldTypeString", "alias": "Severity", "length": 1, "domain": null }, { "name": "Area_Ha", "type": "esriFieldTypeDouble", "alias": "Hectares", "domain": null }, { "name": "REGION", "type": "esriFieldTypeString", "alias": "Region", "length": 30, "domain": null }, { "name": "COMMENT", "type": "esriFieldTypeString", "alias": "Comment", "length": 255, "domain": null }, { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape", "domain": null } ], "geometryField": { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape" }, "indexes": [ { "name": "R2174_pk", "fields": "OBJECTID", "isAscending": true, "isUnique": true, "description": "" }, { "name": "S1888_idx", "fields": "Shape", "isAscending": true, "isUnique": true, "description": "" } ], "subtypes": [], "relationships": [], "canModifyLayer": true, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 1000, "supportsStatistics": true, "supportsAdvancedQueries": true, "hasZ": true, "supportedQueryFormats": "JSON, geoJSON", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsHavingClause": true, "supportsCountDistinct": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsPagination": true, "supportsTrueCurve": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": true }, "supportsDatumTransformation": true, "hasGeometryProperties": true, "geometryProperties": { "shapeAreaFieldName": "Shape.STArea()", "shapeLengthFieldName": "Shape.STLength()", "units": "esriMeters" }, "dateFieldsTimeReference": null, "supportsCoordinatesQuantization": true }