Metadata : Soil and Land Suitability Assessment for Irrigated Agriculture in the Nangu Area, Daly River/Port Keats Aboriginal Land Trust


Metadata Details:

Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile


Date Metadata Extracted:2024-05-23

Date Metadata Last Updated:2021-06-25

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ANZLIC Identifier:3F30879A06E2C7EEE050CD9B21441193

Title: Soil and Land Suitability Assessment for Irrigated Agriculture in the Nangu Area, Daly River/Port Keats Aboriginal Land Trust

Citation Date:2017-03-03

Date Type:creation

Custodian:Department of Environment, Parks and Water Security



This spatial dataset provides polygon information delineating land unit boundaries at a scale of 1: 25 000 and describes the dominant landform, soils and vegetation of the Nangu Area, Daly River/Port Keats Aboriginal Land Trust, Northern Territory. The study area covers 60km2 and is located approximately 15km south-west of Wadeye community.

The primary purpose of the investigation was to map, describe and evaluate soil landscapes to inform future irrigation development in an area with identified potential for groundwater extraction. Core landform, soil and vegetation attributes attached to the land units are included with the spatial dataset.

CAUTION: Map unit boundaries were derived using satellite imagery in association with a digital elevation model, geological and topographic data. Landform, soil and vegetation field assessments conform to national standards and support mapping at a scale of 1:25 000.

When assessing specific areas within the mapping it is recommended a site inspection is undertaken to establish unmapped variation and confirm mapping accuracy on the ground.
The mapping does not indicate, imply or ascertain the likelihood of groundwater availability or the granting of appropriate water extraction licensing needed to satisfy the irrigation requirements of the potential agricultural development options needed.

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Dataset Status

Dataset ID:


Character Set: Latin 1


Maintenance and Update Frequency:notPlanned

Data Currency Start Date:2016-07-05

Data Currency End Date:2021-05-26

Access Constraint:Download the spatial data package (contains spatial data, maps and reports) via

You are licensed to use the geospatial products on the terms and conditions set out in: Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at:
If you do not agree to the terms and conditions you must not use the geospatial products.
You are free to copy, communicate and adapt the licensed material, provided that you abide by the licence terms (including Attribution) and attribute the licensed material using the statement:
Supplied by the Department of Environment, Parks and Water Security. Copyright Northern Territory Government.

Data Quality

Lineage:Version 2 - May 2021
The land capability assessment criteria were updated from text descriptions to the Class number from 0 to 4. This aligns with the Rangelands Division report, General Agricultural Land Capability Framework for the Northern Territory. (in prep) Details about each of the class descriptions are described in Chapter 9, Land Evaluation of the technical report for this soil survey. The data was republished in June 2021 to support the Mapping the Future project for the Wadeye area. Map products for the survey were also updated. Details are noted here

Map unit boundaries delineated from digital satellite imagery (Sentinel-2) and digital elevation model (SRTM-derived 1 second Smoothed DEM). Preliminary linework was captured on field map sheets. Field map sheets incorporated digital satellite imagery and DEM layers. Field map sheets with final linework were scanned and rectified. Linework digitised on screen directly from field map sheets.

Map unit boundaries derived using digital satellite imagery, DEM, geological and topographic data. Field data (site information) described and classified according to national standards at the time of capture.

Map unit polygons collected via geographic information system (ArcGIS/MapInfo). Core landform, soil and vegetation attributes attached to map units with additional attributes unique to individual surveys.

Positional Accuracy:POLYGON DATA - Map unit boundaries digitised on screen directly from digital rectified field maps. Level of accuracy depends on the number of control points on individual map sheets. Control points exclusively used Map Grid of Australia (MGA) grid lines. Depending on the nature of the landscape (the number of control points), positional accuracy may vary. Positional accuracy generally considered high to very high.
POINT DATA - Site point coordinates derived from a geographic positioning system with general accuracy of within 10-50m.

Attribute Accuracy:The attribute information conforms to the 'Australian Soil and Land Survey Field Handbook' at time of capture. Attributes assigned according to the dominant feature. For example, where ten sites have been grouped to describe a particular map unit and two different soils described from these sites then the dominant soil is chosen. The department's list of core attribute values, described in the Data Dictionary below, have been added to each polygon.

LAND EVALUATION (refer to chapter 9 technical report)
In addition to the core attributes, each land unit has been assessed for GENERAL LAND CAPABILITY, evaluating landscape characteristics that could influence the general use of the land. Descriptions for key characteristics considered important have been added to the land unit polygon, including slope, surface rock, soil depth, salinity, soil drainage, erosion, flooding and presence of acid sulfate. Each land capability criteria is described using a class from 1 (good) to 4 (poor). These criteria are used to determine the final General Land Capability Class.

Each land unit has also been attributed with a LAND SUITABILITY CLASS to describe the potential for irrigated agriculture - Class 1 suitable land with negligible limitations to Class 5 unsuitable land with extreme limitations. Fifteen crop groups have been assessed for potential agricultural land use within 2 categories, Irrigated Crops (Perennial, Row, Root, Field, Hay and Forage crops) and Rain-fed Crops (Forestry, Hay and Forage crops).

For detailed information about General Land Capability and Land Suitability Classes, review Land Evaluation, Chapter 9, in the accompanying technical report. (See Supplementary Information in this metadata record for report PDF download details)

Logical Consistency:GIS editing tools were used to rectify all overshoots and undershoots in line work. Polygon topology rules applied are; single part polygons, must not overlap, must not have gaps and each polygon has only one label.



Data Requests OfficerDepartment of Environment, Parks and Water SecurityGeospatial Services Branch (on behalf of department)

Data Dictionary

AttributeAttribute DescriptionPossible CodeCode Description
LAND_UNITAlias: Land Unit
The LAND_UNIT field is the land unit label from the spatial dataset (ie 9a2).
LF_CLASSAlias: Landform Class
Landform class is a system adopted by the department. The categories do not conform to national criteria even though some have been sourced from Australian Soil and Land Survey - Field Handbook (Mc Donald 1998).
LF_DESCAlias: Landform Description
Landform description includes details about landform, and general notes pertaining to slope, surface gravel and other details describing the land unit.
SOILAlias: Dominant Soil Order
The dominant soil order described in a land unit is recorded.
SOIL_DESCAlias: Soil Description
Soil description includes an ASC or Northcote/other soil classification and usually includes colour, soil depth and other notes describing the soil.
SOIL_SYSAlias: Soil Classification System
The soil classification system used to describe the soil in the land unit description
SPECIES_1Alias: Veg Dom Species 1
The dominant vegetation species described in a land unit. The order of species listed determines their dominance.
SPECIES_2Alias: Veg Dom Species 2
Where 2 dominant vegetation species were described in a land unit. The order of species listed determines their dominance.
SPECIES_3Alias: Veg Dom Species 3
Where 3 dominant vegetation species described in a land unit. The order of species listed determines their dominance
SURVEY_IDAlias: Survey Identifier
A department code that usually refers to the first five characters from the original survey site sheet.
SURVEY_NMEAlias: Survey Name
The name of the survey area or report to which the mapping refers
VEG_DESCAlias: Vegetation Description
The dominant species and its structure are recorded. Occasionally it will include `minor' vegetation communities also noted in the land unit description and/or notes specific to the community.
VEG_STRUCAlias: Dominant Veg Structure
Vegetation structural classes from NVIS (ESCAVI 2003), Walker and Hopkins (1998) and Specht (1970) classification schemes
VEG_SYSAlias: Veg Classification System
The National Vegetation Information System (NVIS) classification system.

Supplementary Information

Department Survey Code (Land Units): NANGU_25

Bibliographic Reference: Burgess J., McGrath N., Andrews K. and Wright A. (2017)
Agricultural Land Suitability Series, Report 8. Soil and Land Suitability Assessment for Irrigated Agriculture in the Nangu Area, Daly River/Port Keats Aboriginal Land Trust.
Technical Report 16/2017D, Department of Environment and Natural Resources, Darwin, NT.

- This report is available for download (PDF) via the Northern Territory Library
- Map products for this survey may be downloaded (PDF) via

2021 updates were included in the project: Development Potential of the Wadeye Area. View project website

This record maintained using the NTLIS Metadata Tool