Soil and Land Resources of the Gunn Point Area, 2020

Index:

Metadata
Citation
Description

Dataset Status
Data Quality
Contact Information
Data Dictionary
Supplementary Information

Metadata Details:

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

Version:1.0

Date Metadata Extracted:2024-11-22

Date Metadata Last Updated:2020-07-17

Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=97A8CB3196401DEEE0530101007F94FE

Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=97A8CB3196401DEEE0530101007F94FE

Citation

ANZLIC Identifier:97A8CB3196401DEEE0530101007F94FE

Title: Soil and Land Resources of the Gunn Point Area, 2020

Citation Date:2020-07-17

Date Type:publication

Custodian:Department of Environment, Parks and Water Security

Description

Abstract:

This polygon spatial dataset describes soils and landscapes in the Gunn Point Area, north of Darwin in the Northern Territory.
The primary purpose of the investigation was to map, describe and evaluate soil and landscapes to inform future development. Core landform and soil attributes attached to the land units are included with the spatial dataset. The area was mapped at a scale of 1:25,000. The acid soil component was sourced from existing information mapped at a scale of 1:50,000.
The extent of the Gunn Point Area covers approximated 70,800 ha. and is defined by the Howard Water Allocation Planning Areas north of Gunn Point Road to the coastline.

Vegetation attributes were not included in this dataset.
Refer to the dataset Vegetation Communities in the Gunn Point Area. Metadata record: www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=8739BD7DA89BF802E050CD9B214469EB

This information was compiled as part of the Mapping the Future Project - Gunn Point
This project has identified land capability, water availability and biodiversity values to support land planning and inform development potential over the Gunn Point area.
Reports and maps can be viewed from the webpage: https://denr.nt.gov.au/land-resource-management/development-opportunities

- Development Potential of the Gunn Point Area (2020)
- Biodiversity Assessment of the Gunn Point Area (2020)
- Groundwater Resources of the Gunn Point Area (2020)
- Marine and Coastal Biodiversity Assessment of the Gunn Point Area (2020)
- Soil and Land Resources of the Gunn Point Area (2020)
- Soil and Land Suitability Assessment for Irrigated Agriculture in the Gunn Point Area (2017)
- Vegetation Communities of the Gunn Point Area (2020)

ANZLIC Search Words:

geoscientificInformation

Spatial Domain:

Bounding Coordinates:

North Bounding Coordinate:-12.14312

South Bounding Coordinate:-12.454458765

East Bounding Coordinate:131.29259958

West Bounding Coordinate:130.99281984

Dataset Status

Dataset ID:

Language:English

Character Set: Latin 1

Progress:completed

Maintenance and Update Frequency:notPlanned

Data Currency Start Date:2019-06-01

Data Currency End Date:2020-01-14

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.

Data Quality

Lineage:Two existing land unit and soil surveys have been compiled to produce new consistent mapping over the Gunn Point area. Primary datasets appended to compile the new mapping include;
- Fogarty, PJ, Lynch, B and Wood, B (1984). The Land Resources of the Elizabeth, Darwin and Blackmore Rivers.
- Hill JV and Edmeades, BFJ (2008). Acid Sulfate Soils of the Darwin Region.

Positional Accuracy:Varies depending on source dataset.

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.

LAND EVALUATION: See Chapter 6 in report (refer to Supplementary Information in this metadata record)

- General Land Capabililty evaluates 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, rock outcrop, soil depth, soil drainage and acid sulfate soils.

- Land suitable for irrigated agriculture. A Land Suitability Class is assigned for a range of 9 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.

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.

Completeness:Complete

Contacts

Name Organisation Position Role Phone Fax Email

Data Requests Officer Department of Environment, Parks and Water Security Geospatial Services Branch (on behalf of department) distributor datarequests.depws@nt.gov.au

Name	Organisation	Position	Role	Phone	Fax	Email
Data Requests Officer	Department of Environment, Parks and Water Security	Geospatial Services Branch (on behalf of department)	distributor			datarequests.depws@nt.gov.au

Data Dictionary

Attribute Attribute Description Possible Code Code Description

01. SURVEY_NME Alias: Survey Name
The name of the survey area or report to which the mapping refers

02. SURVEY_ID Alias: Survey Identifier
A department code that usually refers to the first five characters from the original survey site sheet.

03. LAND_UNIT Alias: Land Unit
The LAND_UNIT field is the land unit label from the spatial dataset (ie 9a2).

04. LFORM_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).

05. SOIL_SYS Alias: Soil Classification System
The soil classification system used to describe the soil in the land unit description

06. SOIL Alias: Dominant Soil Order
The dominant soil order described in a land unit is recorded.

07. LFORM_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.

08. 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.

09 - 18. Land Evaluation Land evaluation criteria.
Landscape characteristics were evaluated that could influence the general use of the land. Descriptions for key characteristics considered important include slope, surface rock, soil depth, soil drainage, flooding, salinity and acid sulfate soils. For detailed information about General Land Capability review the Land Evaluation chapter in the accompanying report.

19 - 22. LCAP Alias: General Land Capability Class

Land capability assessment involves an evaluation of land unit characteristics that could influence the general use of the land. The five key land characteristics considered important for land evaluation in the survey area are - Slope; Rock outcrop; Soil depth; Soil drainage and Acid sulfate soils.

Class 1 has the highest degree of capability and Class 4 has the lowest capability for a range of land uses. Class 1 is not present in this survey. 1. High Land with minimal limitations. Highly productive requiring only low management practices (Slope 0-1%; rock outcrop nil; soil depth >1.5 m; soil drainage rapid to well; ASS not present; erosion risk low)

2. Moderate Land with only moderate limitations. Will require minor management practices (Slope 1-2%; and/or rock outcrop 0-2%; and/or soil depth 0.5-1.5 m; and/or soil drainage moderate; ASS not present; and/or erosion risk minor)

3. Marginal Land having severe limitations. Will require major management practices (Slope 2-3%; and/or rock outcrop 2-10%; and/or soil depth 0.25-0.5 m; and/or soil drainage imperfect; and/or low probability of ASS soil present; and/or erosion risk high)

4. Not Suitable Land having extreme limitations. This includes erosion risk due to steep slopes, soil depth, rocky outcrops, and poor drainage (Slope >3%; and/or rock outcrop >10%; and/or soil depth <0.25 m; and/or soil drainage poor to very poor; and/or high probability of ASS present; and/or erosion risk very high)

23 - 32. AGSC_G1 to AGSC_G10 Alias: Land Suitability Class for Agricultural Group 1 (to Group 10).
Class 1 - 5 for each irrigated crop group based on land evaluation limitations. Class 1 is suitable land with negligible limitations through to class 5 which is unsuitable land with extreme limitations. 1. Suitable land with negligible limitations. This is highly productive land requiring only simple management practices to maintain sustainable production.

2. Suitable land with minor limitations which either physically reduce or constrain production; or require more than the simple management practices of Class 1 land to maintain sustainable production.

3. Suitable land with moderate limitations which either further constrain production or require more than the management practices of Class 2 land to maintain sustainable production.

4. Marginal land that is currently unsuitable due to severe limitations that preclude the sustainable economic use of the land in the manner proposed. The limitations may (or may not) be surmountable over time with changes to knowledge, economics or technology potentially leading to changes in the future suitability class for this category.

33. AREA_HA The area of each polygon has been calculated in hectares.

Attribute	Attribute Description	Possible Code	Code Description
01. SURVEY_NME	Alias: Survey Name The name of the survey area or report to which the mapping refers
02. SURVEY_ID	Alias: Survey Identifier A department code that usually refers to the first five characters from the original survey site sheet.
03. LAND_UNIT	Alias: Land Unit The LAND_UNIT field is the land unit label from the spatial dataset (ie 9a2).
04. LFORM_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).
05. SOIL_SYS	Alias: Soil Classification System The soil classification system used to describe the soil in the land unit description
06. SOIL	Alias: Dominant Soil Order The dominant soil order described in a land unit is recorded.
07. LFORM_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.
08. 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.
09 - 18. Land Evaluation	Land evaluation criteria. Landscape characteristics were evaluated that could influence the general use of the land. Descriptions for key characteristics considered important include slope, surface rock, soil depth, soil drainage, flooding, salinity and acid sulfate soils. For detailed information about General Land Capability review the Land Evaluation chapter in the accompanying report.
19 - 22. LCAP	Alias: General Land Capability Class Land capability assessment involves an evaluation of land unit characteristics that could influence the general use of the land. The five key land characteristics considered important for land evaluation in the survey area are - Slope; Rock outcrop; Soil depth; Soil drainage and Acid sulfate soils. Class 1 has the highest degree of capability and Class 4 has the lowest capability for a range of land uses. Class 1 is not present in this survey.	1. High	Land with minimal limitations. Highly productive requiring only low management practices (Slope 0-1%; rock outcrop nil; soil depth >1.5 m; soil drainage rapid to well; ASS not present; erosion risk low)
		2. Moderate	Land with only moderate limitations. Will require minor management practices (Slope 1-2%; and/or rock outcrop 0-2%; and/or soil depth 0.5-1.5 m; and/or soil drainage moderate; ASS not present; and/or erosion risk minor)
		3. Marginal	Land having severe limitations. Will require major management practices (Slope 2-3%; and/or rock outcrop 2-10%; and/or soil depth 0.25-0.5 m; and/or soil drainage imperfect; and/or low probability of ASS soil present; and/or erosion risk high)
		4. Not Suitable	Land having extreme limitations. This includes erosion risk due to steep slopes, soil depth, rocky outcrops, and poor drainage (Slope >3%; and/or rock outcrop >10%; and/or soil depth <0.25 m; and/or soil drainage poor to very poor; and/or high probability of ASS present; and/or erosion risk very high)
23 - 32. AGSC_G1 to AGSC_G10	Alias: Land Suitability Class for Agricultural Group 1 (to Group 10). Class 1 - 5 for each irrigated crop group based on land evaluation limitations. Class 1 is suitable land with negligible limitations through to class 5 which is unsuitable land with extreme limitations.	1.	Suitable land with negligible limitations. This is highly productive land requiring only simple management practices to maintain sustainable production.
		2.	Suitable land with minor limitations which either physically reduce or constrain production; or require more than the simple management practices of Class 1 land to maintain sustainable production.
		3.	Suitable land with moderate limitations which either further constrain production or require more than the management practices of Class 2 land to maintain sustainable production.
		4.	Marginal land that is currently unsuitable due to severe limitations that preclude the sustainable economic use of the land in the manner proposed. The limitations may (or may not) be surmountable over time with changes to knowledge, economics or technology potentially leading to changes in the future suitability class for this category.
33. AREA_HA	The area of each polygon has been calculated in hectares.

Supplementary Information

Department Survey Code (Land Units) GUNSOIL_25
Easey, D, Lynch, B and Edmeades, B (2020)
Mapping the Future Project - Gunn Point. Soil and Land Resources of the Gunn Point area, Northern Territory.
Technical Report 7/2020, Department of Environment and Natural Resources, Darwin, NT.

- Download report (PDF) - hdl.handle.net/10070/797851
- Download maps (PDF) - www.ntlis.nt.gov.au/mpds/get_file?file_id=8622

ADDITIONAL REFERENCES
Vegetation Communities of the Gunn Point Area
Metadata: http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=8739BD7DA89BF802E050CD9B214469EB

Land Resources of the Elizabeth, Darwin and Blackmore Rivers - Greater Darwin Area, Northern Territory.
Metadata: www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=2DBCB771203606B6E040CD9B0F274EFE

Acid Sulfate Soils of the Darwin Region
Metadata: www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=69E883F174D73FA1E040CD9B21444E84

Soil and Land Suitability Assessment for Irrigated Agriculture in the Gunn Point Area (2017)
Metadata: www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=3F592972C2006A85E050CD9B21441C22

This record maintained using the NTLIS Metadata Tool

Metadata : Soil and Land Resources of the Gunn Point Area, 2020