Name: Tongass Landslide Areas

Display Field: LANDSLIDE_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This is a once-over landslide inventory of the Tongass National Forest. This inventory includes all mass wasting features, including talus slopes, snow avalanche fields, and snow avalanche chutes. Each of these are coded differently in the attributes. It may be necessary to exclude several polygons in this data set when using it to determine landslide rates. Most of these landslide polygons were digitized on the 1998 to 2010 orthophotos in GIS. Many of them were age bracketed using air photos back to the 1929 Navy Trimegon photos. It includes both field and photo interpreted landslides. Not all of the landslides included once-over completed in FY2017 were age bracketed. There is an associated Points feature class (Tongass_Landslide_Initiation) that represents the landslide initiation zone approximations. These points only exist for true landslides: debris avalanches, debris torrents, combination debris avalanches/torrents, slumps, rotation failures, and rock fall-initiated failures.

Copyright Text: Dennis Landwehr, Forest Soil Scientist, Ketchikan, AK

Default Visibility: true

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

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: -139.636216007
YMin: 54.669428144
XMax: -130.01573225
YMax: 59.992378752
Spatial Reference: 4269  (4269)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: FAIL_TYPE
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: SOAR-DEFL-FLOW
  Label: Combination debris avalanche and debris torrent
  Description: N/A
  Symbol:
  
• Value: SOAR-DEAV-FLOW
  Label: Debris avalanche
  Description: N/A
  Symbol:
  
• Value: MASC-UNDI-SLID
  Label: Debris avalanche field
  Description: N/A
  Symbol:
  
• Value: TRZO-DEFL-FLOW
  Label: Debris torrent
  Description: N/A
  Symbol:
  
• Value: SOAR-ROFA-COMP
  Label: Rock fall initiated failures
  Description: N/A
  Symbol:
  
• Value: ROSL-SLID
  Label: Rotational slide
  Description: N/A
  Symbol:
  Style: esriSFSBackwardDiagonal
  Color: [137, 68, 68, 255]
  Outline:
  Style: esriSLSSolid
  Color: [137, 68, 68, 255]
  Width: 0
• Value: SLEF-COMP
  Label: Slump
  Description: N/A
  Symbol:
  Style: esriSFSBackwardDiagonal
  Color: [137, 68, 68, 255]
  Outline:
  Style: esriSLSSolid
  Color: [137, 68, 68, 255]
  Width: 0
• Value: TRZO-SNAS-FLOW
  Label: Snow avalanche chute
  Description: N/A
  Symbol:
  
• Value: SOAR-SNAS-FLOW
  Label: Snow avalanche field
  Description: N/A
  Symbol:
  
• Value: DEPO-FAPS-FALL
  Label: Talus slopes
  Description: N/A
  Symbol:
  
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:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• TNF_LS_NO ( type: esriFieldTypeInteger, alias: TNF_LS_NO )
• SLIDE_NO ( type: esriFieldTypeString, alias: SLIDE_NO, length: 5 )
• INVENTORY ( type: esriFieldTypeString, alias: INVENTORY, length: 4 , Coded Values: [FSL1: Helmer's airphoto inventory of 1964] , [FSL2: Tom Swan's airphoto inventory 1973-84] , [FSL3: FSL field inventory 1984-86] , ...29 more... )
• CONFID_DAT ( type: esriFieldTypeString, alias: CONFID_DAT, length: 9 )
• YR_INT_TYP ( type: esriFieldTypeString, alias: YR_INT_TYP, length: 5 )
• YR_OCCURANCE ( type: esriFieldTypeInteger, alias: YR_OCCURANCE )
• LATEST_YEAR_NOTSEEN ( type: esriFieldTypeSmallInteger, alias: LATEST_YEAR_NOTSEEN )
• FIRST_YEAR_SEEN ( type: esriFieldTypeSmallInteger, alias: FIRST_YEAR_SEEN )
• TREATMENT ( type: esriFieldTypeString, alias: TREATMENT, length: 1 , Coded Values: [Y: Yes] , [N: No] )
• RD_RELATED ( type: esriFieldTypeString, alias: RD_RELATED, length: 1 , Coded Values: [Y: Yes] , [N: No] )
• STRM_IMPAC ( type: esriFieldTypeString, alias: STRM_IMPAC, length: 1 , Coded Values: [Y: Yes] , [N: No] )
• PRED_COVER ( type: esriFieldTypeString, alias: PRED_COVER, length: 50 , Coded Values: [BARE: Bare Soil] , [BATR: Trees] , [BEDR: Bedrock] , ...2 more... )
• COVER_SPP ( type: esriFieldTypeString, alias: COVER_SPP, length: 50 , Coded Values: [ALRU2: red alder] , [PISI: sitka spruce] , [PHAR3: grasses] , ...2 more... )
• COVER_PERCENT ( type: esriFieldTypeSmallInteger, alias: COVER_PERCENT )
• FAIL_TYPE ( type: esriFieldTypeString, alias: FAIL_TYPE, length: 14 , Coded Values: [SOAR-DEFL-FLOW: Combination debris avalanche and debris torrent] , [SOAR-DEAV-FLOW: Debris avalanche] , [MASC-UNDI-SLID: Debris avalanche field] , ...7 more... )
• VEG_CLASS ( type: esriFieldTypeString, alias: VEG_CLASS, length: 2 , Coded Values: [UN: Unvegetated] , [AL: Alder] , [PV: Partially revegetated] , ...1 more... )
• EXAMINER ( type: esriFieldTypeString, alias: EXAMINER, length: 50 , Coded Values: [Darin Silkworth: Darin Silkworth] , [Dennis Landwehr: Dennis Landwehr] , [Becki Saari: Becki Saari] , ...4 more... )
• SLOPE_PER ( type: esriFieldTypeSmallInteger, alias: SLOPE_PER )
• SLOPE_SHA ( type: esriFieldTypeString, alias: SLOPE_SHA, length: 2 )
• BDRK_F_ZON ( type: esriFieldTypeString, alias: BDRK_F_ZON, length: 3 )
• PM_F_ZONE ( type: esriFieldTypeString, alias: PM_F_ZONE, length: 3 )
• LANDSLIDE_NAME ( type: esriFieldTypeString, alias: LANDSLIDE_NAME, length: 50 )
• LANDWEHR_N ( type: esriFieldTypeString, alias: LANDWEHR_N, length: 3 )
• GROUPED_SL ( type: esriFieldTypeString, alias: GROUPED_SL, length: 2 )
• RECURRANCE ( type: esriFieldTypeString, alias: RECURRANCE, length: 9 )
• NUMBER_ ( type: esriFieldTypeString, alias: NUMBER_, length: 4 )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• SHAPE.AREA ( type: esriFieldTypeDouble, alias: SHAPE.AREA )
• SHAPE.LEN ( type: esriFieldTypeDouble, alias: SHAPE.LEN )

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

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