Parent Layer: Topography

Name: Topographic Position Index (TPI)

Display Field:

Type: Raster Layer

Geometry Type: null

Description: Landscape shape dictates slope stability in steep terrain by concentrating or dispersing water in the landscape. The TPI is an index that reflects the morphology of the topography. The three basic hydro-geomorphic units useful to assessing debris-flow susceptibility are 1)divergent (convex; positive TPI value); 2) planar (flat; around 0); and 3) convergent (concave; negativeTPI value) slope segments. Debris flows frequently occur in slope depressions, shallow ducts,and gullies that are characterized by terrain concavities. The TPI image was generated by applying the Jenness algorithm that considers the surrounding cells up to a certain distance. We calculated the TPI using varying neighboring radiuses (range: 20m to 500m) and conducted a contingency test to identify the most suitable radius, which was found to to be 100m. TPI ranges in the study area from -145.5 (blue) to 141.5 (red).

Copyright Text:

Default Visibility: true

MaxRecordCount: 0

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: false

Supports Statistics: false

Has Labels: false

Can Modify Layer: false

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 42.7384574699044
YMin: 17.139967357336815
XMax: 43.20344472787554
YMax: 17.731447529677986
Spatial Reference: 4326  (4326)

Drawing Info:

N/A

Advanced Query Capabilities:

Supports Statistics: false
Supports OrderBy: false
Supports Distinct: false
Supports Pagination: false
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: false
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: false
Supports Having Clause: false
Supports Count Distinct: false
Supports Time Relation: true
Supports Sql Format: false
Supports Query Analytic: false
Supports Query With Current User: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Type ID Field: null

Fields: None


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

  Iteminfo   Thumbnail   Metadata