View In:   ArcGIS Online Map Viewer

Name: Landslide Trigger Point 1997

Display Field: PTYPE

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This map identifies the principal areas in the San Francisco Bay region that are likely to produce debris flows, which are also called "mudslides." Debris flows that occur in the bay region are fast-moving downslope flows of mud that may include rocks, vegetation, and other debris. These flows begin during intense rainfall as shallow landslides on steep slopes. The rapid movement and sudden arrival of debris flows pose a hazard to life and property during and immediately following the triggering rainfall. Debris flows in a given storm originate from a number of sources scattered throughout steep parts of the landscape, as shown in figure 1 (on map sheet; files sfbrdf.ps, al-df.ps, etc.). During subsequent storms, new debris flows originate from different sources. These various sources, however, are similar in topographic form because debris-flow initiation requires steep slopes and prefers concave parts of hillsides. These topographic characteristics are used to predict the likely future source areas shown on this map.

Copyright Text: The predicted debris-flow source areas were determined by Ellen and Mark by analysis of detailed mapping (Wentworth, 1986; Ellen, Cannon, and Reneau, 1988) that was meticulously digitized by Ramsey and May. The mapped debris-flow sources triggered by the 1982 storm were digitized by Wieczorek and Mark from mapping documented in Ellen and Wieczorek (1988); the boundary of this mapping was digitized by Beukelman. The shaded-relief topographic base was created by Graham using relations provided by R.A. Haugerud.

Default Visibility: true

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Supports Datum Transformation: true

Extent:

XMin: -1.3669359909187192E7
YMin: 4600666.575586665
XMax: -1.3622652410946948E7
YMax: 4677738.16215476
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
Style: esriSMSCircle
Color: [56, 105, 145, 255]
Size: 4.0
Angle: 0.0
XOffset: 0
YOffset: 0
Outline:
[0, 0, 0, 255] Width: 0
Label: N/A
Description: N/A
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: true
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: false
Supports Sql Format: false
Supports Query Analytic: true
Supports Query With Current User: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field:

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID, editable: false, nullable: false, defaultValue: null, modelName: OBJECTID )
• USGS.GEO_LND_SLIDE_PT.AREA ( type: esriFieldTypeDouble, alias: USGS.GEO_LND_SLIDE_PT.AREA, editable: true, nullable: true, defaultValue: null, modelName: USGS.GEO_LND_SLIDE_PT.AREA )
• PERIMETER ( type: esriFieldTypeDouble, alias: PERIMETER, editable: true, nullable: true, defaultValue: null, modelName: PERIMETER )
• SON_DFS0_ ( type: esriFieldTypeInteger, alias: SON_DFS0_, editable: true, nullable: true, defaultValue: null, modelName: SON_DFS0_ )
• SON_DFS0_I ( type: esriFieldTypeInteger, alias: SON_DFS0_I, editable: true, nullable: true, defaultValue: null, modelName: SON_DFS0_I )
• PTYPE ( type: esriFieldTypeString, alias: PTYPE, editable: true, nullable: true, length: 35, defaultValue: null, modelName: PTYPE )
• LSLIDE ( type: esriFieldTypeString, alias: LSLIDE, editable: true, nullable: true, length: 35, defaultValue: null, modelName: LSLIDE )
• UNIT ( type: esriFieldTypeString, alias: UNIT, editable: true, nullable: true, length: 35, defaultValue: null, modelName: UNIT )
• COUNTY ( type: esriFieldTypeSmallInteger, alias: COUNTY, editable: true, nullable: true, defaultValue: null, modelName: COUNTY )
• AGE ( type: esriFieldTypeString, alias: AGE, editable: true, nullable: true, length: 3, defaultValue: null, modelName: AGE )
• LITH ( type: esriFieldTypeString, alias: LITH, editable: true, nullable: true, length: 3, defaultValue: null, modelName: LITH )
• AGELITH ( type: esriFieldTypeString, alias: AGELITH, editable: true, nullable: true, length: 7, defaultValue: null, modelName: AGELITH )
• NPTYPE ( type: esriFieldTypeSmallInteger, alias: NPTYPE, editable: true, nullable: true, defaultValue: null, modelName: NPTYPE )
• X_COORD ( type: esriFieldTypeDouble, alias: X_COORD, editable: true, nullable: true, defaultValue: null, modelName: X_COORD )
• Y_COORD ( type: esriFieldTypeDouble, alias: Y_COORD, editable: true, nullable: true, defaultValue: null, modelName: Y_COORD )
• PTFREQ ( type: esriFieldTypeInteger, alias: PTFREQ, editable: true, nullable: true, defaultValue: null, modelName: PTFREQ )
• SQKM ( type: esriFieldTypeDouble, alias: SQKM, editable: true, nullable: true, defaultValue: null, modelName: SQKM )
• ABUND ( type: esriFieldTypeDouble, alias: ABUND, editable: true, nullable: true, defaultValue: null, modelName: ABUND )
• F_POLYGONI ( type: esriFieldTypeInteger, alias: F_POLYGONI, editable: true, nullable: true, defaultValue: null, modelName: F_POLYGONI )
• F_SCALE ( type: esriFieldTypeDouble, alias: F_SCALE, editable: true, nullable: true, defaultValue: null, modelName: F_SCALE )
• F_ANGLE ( type: esriFieldTypeDouble, alias: F_ANGLE, editable: true, nullable: true, defaultValue: null, modelName: F_ANGLE )

Templates:

• Name: Landslide Trigger Point 1997
  Description:
  Prototype:
  F_SCALE: null
  F_ANGLE: null
  USGS.GEO_LND_SLIDE_PT.AREA: null
  PERIMETER: null
  SON_DFS0_: null
  SON_DFS0_I: null
  PTYPE: null
  LSLIDE: null
  UNIT: null
  COUNTY: null
  AGE: null
  LITH: null
  AGELITH: null
  NPTYPE: null
  X_COORD: null
  Y_COORD: null
  PTFREQ: null
  SQKM: null
  ABUND: null
  F_POLYGONI: null
  
  Drawing Tool: esriFeatureEditToolPoint

Capabilities: Query,Extract

Sync Can Return Changes: false

Is Data Versioned: false

Supports Rollback On Failure: true

Supports ApplyEdits With Global Ids: false

Supports Query With Historic Moment: false

Supports Coordinates Quantization: true

Child Resources:   Field Groups   Contingent Values

Supported Operations:   Query   Query Analytic   Validate SQL   Generate Renderer   Return Updates   Iteminfo   Thumbnail   Metadata   Update Metadata