2567BDC8C2A7E80EE050CD9B214424ABEnglishData Requests OfficerDepartment of Environment, Parks and Water SecurityGeospatial Services Branch (on behalf of department)datarequests.depws@nt.gov.au2017-06-21AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Soil and Land Suitability Assessment for Irrigated Agriculture in the Ali Curung Area, Western Davenport District2015-11-26This 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 Ali Curung Area, Western Davenport District, Northern Territory. The study area covers 382km2 and is located approximately 150km south of the Tennant Creek township via the Stuart Highway. The community of Ali Curung is 50km east of the Stuart Highway. The survey extent consists of 4 sections due to available groundwater resources and landholder interest.
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.
Download the spatial data package (contains spatial data, maps and reports) via https://data.nt.gov.au/
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Supplied by the Department of Environment and Natural Resources. Copyright Northern Territory Government.English-21.2224857219999-20.7948656089999134.055372282134.5085681022015-07-142017-01-31datasetnot 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. Attribute values, as described in the Data Dictionary below, have been added to each polygon.
Each land unit has been attributed with a suitability class to describe the potential for irrigated agriculture. (Class 1 suitable land with negligible limitations to Class 5 unsuitable land with extreme limitations) Seven crop groups have been assessed for potential agricultural suitability.
Group 1. Field crops - Chia, quinoa
Group 2. Hay/forage crops - Grass hay (Rhodes grass, digit grass, panics, sorghum, oats, barley) forage legumes (lucerne, peanut)
Group 3. Tree crops (evergreen) - Citrus (lime, lemon, mandarin, orange, grapefruit, tangelo), mango, avocado, longan, lychee
Group 4. Tree crops (deciduous) - Fig, pomegranate, low chill stone fruit, table grape
Group 5. Row crops (annual) - cucurbit species (watermelon, hami melon, honeydew melon, rockmelon, pumpkin, zucchini, squash) salad vegetables (lettuce, baby spinach, rocket), Asian greens, summer vegetables (Solanaceae species - capsicum, chilli, eggplant, tomato) sweet corn, beans, snow peas, Brassica species
Group 6. Row crops (perennial) - Asparagus
Group 7. Root crops - Garlic, onion, potato, sweet potato0Map unit boundaries delineated from digital satellite imagery (WorldView-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.