5CCCFBD9176A2D21E050CD9B2144301FEnglishData Requests OfficerDepartment of Environment, Parks and Water SecurityGeospatial Services Branch (on behalf of department)datarequests.depws@nt.gov.au2021-12-15AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Soil and Land Suitability Assessment for Irrigated Agriculture in the East Arnhem Land Region2021-12-15This 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.
This information is available for use by the Department of Environment, Parks and Water Security.
PUBLIC ACCESS TO INFORMATION PRODUCTS
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.English-12.930041823-12.304250091135.725049538136.6311637672017-03-012021-12-15datasetnot knownComplete0not knownGIS 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.0not knownPolygon 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.0not knownThe 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:
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)0Map 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.