Metadata : Soil and Land Suitability Assessment for Irrigated Agriculture in the Gunn Point area, 2017
Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile
Date Metadata Extracted:2023-02-02
Date Metadata Last Updated:2020-06-16
Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=3F592972C2006A85E050CD9B21441C22
Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=3F592972C2006A85E050CD9B21441C22
Title: Soil and Land Suitability Assessment for Irrigated Agriculture in the Gunn Point area, 2017
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 soils and vegetation of the Gunn Point area, Northern Territory. The study area covers 75 km2 and is located approximately 40 km north of the Palmerston township via Gunn Point Road over NT Portions 2626 and 4476 and Portion 2727 within the Hundreds of Bagot and Paton.
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.
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.
- North Bounding Coordinate:-12.1823395622862
- South Bounding Coordinate:-12.3181910286515
- East Bounding Coordinate:131.141075457864
- West Bounding Coordinate:131.0443842
Character Set: Latin 1
Maintenance and Update Frequency:notPlanned
Data Currency Start Date:2016-10-21
Data Currency End Date:2017-06-30
Access Constraint:Download the spatial data package (contains spatial data, maps and reports) via data.nt.gov.au/
You are licensed to use the DENR geospatial products on the terms and conditions set out in: Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at: creativecommons.org/licenses/by/4.0/legalcode
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 and Natural Resources. Copyright Northern Territory Government.
Lineage: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. Attribute values, as described in the Data Dictionary below, have been added to each polygon.
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, surface rock, soil depth, soil drainage and presence of acid sulfate soils.
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 7, in the accompanying technical 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.
Name Organisation Position Role Phone Fax Data Requests Officer Department of Environment, Parks and Water Security Geospatial Services Branch (on behalf of department) distributor firstname.lastname@example.org
Attribute Attribute Description Possible Code Code Description LAND_UNIT Alias: Land Unit
The LAND_UNIT field is the land unit label from the spatial dataset (ie 9a2).
LF_CLASS Alias: 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 et.al. 1998).
LF_DESC Alias: Landform Description
Landform description includes details about landform, and general notes pertaining to slope, surface gravel and other details describing the land unit.
SOIL Alias: Dominant Soil Order
The dominant soil order described in a land unit is recorded.
SOIL_DESC Alias: 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_SYS Alias: Soil Classification System
The soil classification system used to describe the soil in the land unit description
SPECIES_1 Alias: Veg Dom Species 1
The dominant vegetation species described in a land unit. The order of species listed determines their dominance.
SPECIES_2 Alias: Veg Dom Species 2
Where 2 dominant vegetation species were described in a land unit. The order of species listed determines their dominance.
SPECIES_3 Alias: Veg Dom Species 3
Where 3 dominant vegetation species described in a land unit. The order of species listed determines their dominance
SURVEY_ID Alias: Survey Identifier
A department code that usually refers to the first five characters from the original survey site sheet.
SURVEY_NME Alias: Survey Name
The name of the survey area or report to which the mapping refers
VEG_DESC Alias: 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_STRUC Alias: Dominant Veg Structure
Vegetation structural classes from NVIS (ESCAVI 2003), Walker and Hopkins (1998) and Specht (1970) classification schemes
VEG_SYS Alias: Veg Classification System
The National Vegetation Information System (NVIS) classification system.
Department Survey Code (Soil Survey): GUNNP_25
Easey D, Brocklehurst P, and Emberg J (2017)
Agricultural Land Suitability Series, Report 7.
Soil and Land Suitability Assessment for Irrigated Agriculture in the Gunn Point Area
Technical Report 7/2017D, Department of Environment and Natural Resources, Darwin, NT.
- Download the report (PDF 10MB) via the Northern Territory Library; hdl.handle.net/10070/266788
- Download map products created for this survey; www.ntlis.nt.gov.au/mpds/get_file?file_id=7402
This record maintained using the NTLIS Metadata Tool