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Benthic Position Index Grid of Darwin Harbour

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

Dataset citation

ANZLIC unique identifier: ANZCW0703016944

Title: Benthic Position Index Grid of Darwin Harbour


Custodian: Geoscience Australia

Jurisdiction: Australia



The Benthic (Topographic) Position Index (Weiss 2001) grid indicates the topographic positions of the cells. Positive TPI values represent locations that are higher than the average of their surrounding (ridges); negative TPI values represent locations that are lower than their surrounding (valleys); TPI values near zero are either flat areas or areas of constant slope. The benthic position index grid was derived from the bathymetry grid of Darwin Harbour. Please see the metadata of the bathymety grid for more details (GeoCat No: 74915).

Weiss, A.D., 2001. Topographic position and landforms analysis. In: ESRI international user

conference, 9?13 July 2001, San Diego, CA.

ANZLIC search words:

  • MARINE Mapping
  • MARINE Geology and Geophysics

Spatial domain:

locality map

Geographic extent name: NORTHERN TERRITORY - NT - State or Territory - Northern Territory

Geographic extent polygon: 130.69 -12.32, 130.94 -12.32, 130.94 -12.59, 130.69 -12.59, 130.69 -12.32,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -12.32 °
South bounding latitude: -12.59 °
East bounding longitude: 130.94 °
West bounding longitude: 130.69 °

Data currency

Beginning date: 2013-02-23

Ending date: 2013-02-23

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - ArcGIS-grid ArcInfo grid
Available format type:
DIGITAL - ArcGIS-grid ArcInfo grid

Access constraints:

Creative Commons Attribution 3.0 Australia Licence

Free Data Download

Data quality


The equation used for the calculation of the benthic position index grid is:

tpi = bathy - focalmean(bathy, rectangle, 3, 3) where bathy is the bathymety grid; focalmean() function is avaiable in ArcGIS

Positional accuracy:

the same as the bathymetry grid of Darwin Harbour

Attribute accuracy:

The grid is a direct derivative of the bathymetry grid of Darwin Harbour. Therefore, its attribute accuracy is directly related to that of the bathymetry grid.

Logical Consistency:

no issue



Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address:

Metadata information

Metadata date: 2013-03-08

Additional metadata

Metadata reference XHTML:

Metadata reference XML:


Authors:Zhi Huang