Metadata : Soil and Land Suitability Assessment for Irrigated Agriculture in the East Arnhem Land Region


Metadata Details:

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


Date Metadata Extracted:2023-03-23

Date Metadata Last Updated:2021-12-15

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ANZLIC Identifier:5CCCFBD9176A2D21E050CD9B2144301F

Title: Soil and Land Suitability Assessment for Irrigated Agriculture in the East Arnhem Land Region

Citation Date:2021-12-15

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: 50 000 within Eastern Arnhem Land, Northern Territory and describes dominant landform, soils and vegetation. The study area is comprised of 4 separate survey sections and covers an area of 800 km2 located between the communities of Gapuwiyak and Yirrkala in North East Arnhem Land.

The primary purpose of the investigation is 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 1:50 000.
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

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Character Set: Latin 1


Maintenance and Update Frequency:notPlanned

Data Currency Start Date:2017-03-01

Data Currency End Date:2021-12-15

Access Constraint:This information is available for use by the Department of Environment, Parks and Water Security.

The Department is awaiting formal endorsement from the Northern Land Council and Traditional Owners before public release of the spatial datasets, mapping products and technical report.
Until the department receives formal endorsement, public requests for these datasets and associated products must be accompanied by written approval from the Northern Land Council.

Data Quality

Lineage:Map unit boundaries delineated from digital satellite imagery (WorldView-2) and digital elevation model (SRTM-derived 1 second Smoothed DEM). Preliminary line-work was captured on field map sheets. Field map sheets incorporated digital satellite imagery and DEM layers. Field map sheets with final line-work were scanned and rectified. Line-work 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.

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 has assigned a list of core attribute values, described in the Data Dictionary below, to each polygon.
The attribute naming format uses 10 characters with no spaces to be suitable for an ESRI shape-file format. An alias attribute name is applied to an ESRI file geo-database format.

Each land unit has also 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, soil depth, soil drainage and rock outcrop.

A LAND SUITABILITY CLASS is assigned for a range of 10 irrigated crop groups based on land evaluation limitations. Class 1 is suitable land with negligible limitations through to class 5 which is unsuitable land with extreme limitations.

For detailed information about General Land Capability and Land Suitability Classes, review Land Evaluation, Chapter 8, in the accompanying report. (See Supplementary Information in this metadata record)

Logical Consistency:GIS editing tools were used to rectify all overshoots and undershoots in line work. Polygon topology rules applied are; 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
01. SURVEY_NMEAlias: Survey Name
The name of the survey area or report to which the mapping refers
02. SURVEY_IDAlias: Survey Identifier
A department code that usually refers to the first five characters from the original survey site sheet.
03. LAND_UNITAlias: Land Unit
The LAND_UNIT field is the land unit label from the spatial dataset (ie 9a2).
04. 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).
05. SOIL_SYSAlias: Soil Classification System
The soil classification system used to describe the soil in the land unit description
06. SOILAlias: Dominant Soil Order
The dominant soil order described in a land unit is recorded.
07. VEG_SYSAlias: Veg Classification System
The National Vegetation Information System (NVIS) classification system.
08. VEG_STRUCAlias: Dominant Veg Structure
Vegetation structural classes from NVIS (ESCAVI 2003), Walker and Hopkins (1998) and Specht (1970) classification schemes
09. SPECIES_1Alias: Veg Dom Species 1
The dominant vegetation species described in a land unit. The order of species listed determines their dominance.
10. 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.
11. SPECIES_3Alias: Veg Dom Species 3
Where 3 dominant vegetation species described in a land unit. The order of species listed determines their dominance
12. 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.
13. 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.
14. 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.

Supplementary Information

Department Survey Code (Land Units): EARNH_50
This spatial dataset should not be used at scales greater than 1 : 50,000

Bibliographic Reference:
Easey D, Emberg J and Brocklehurst P (2018)
Soil and Land Suitability Assessment for Irrigated Agriculture in the East Arnhem Land region, Northern Territory.
Technical Report 8/2018D, Department of Environment and Natural Resources, Darwin, NT.

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