864962904A109E75E040CD9B2144745EEnglishData Requests OfficerDepartment of Lands, Planning and EnvironmentGeospatial Services Unit (on behalf of department)Datarequests.DLPE@nt.gov.au2021-08-06AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Land Units Trial Paddocks McArthur River Station1988-01-012021-08-06This high resolution land resource survey dataset describes landform, soil and vegetation. The mapped information describes attributed land unit polygons over an area of 97.3km2 within the Colinta Trial Paddocks of McArthur River Station, NT Por 4319, Northern Territory. The survey data was originally compiled in 1988 and prepared at a scale of 1:50,000. Core attributes describing the land units, as defined by this department, were added to the spatial dataset in September 2020. Download the spatial data package (contains spatial data, maps and reports) via https://data.nt.gov.au/ You are licensed to use the geospatial products on the terms and conditions set out in: Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at: https://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, Parks and Water Security. Copyright Northern Territory Government.English-16.527238-16.427311135.780717135.8960612010-05-112021-08-06datasetnot knownComplete0not knownGIS editing tools were used to rectify all overshoots and undershoots in linework. Using ESRI ArcInfo, topological consistency checks were performed to detect flaws in the spatial data structure. The coverage was cleaned to eliminate any duplicate arcs and built for arcs and polygon topologies. A label errors routine was run to detect unlabelled polygons and also to locate any identical neighbouring mapunit labels. A node errors routine was run to identify any pseudo nodes and dangles. The checks ensure that all polygons are closed, nodes are formed at intersections of lines and that each polygon has only one label.0not knownMap unit boundaries transferred from aerial photographs to topographic maps, using the best available topographic mapping at the time (generally 1:100 000) via a mapograph. Level of accuracy depends on the number of control points on individual aerial photographs. Control points include creek lines, cadastre and other topographic features. Depending on the nature of the landscape (the number of control points), positional accuracy may vary. Positional accuracy generally considered moderate to high.0not knownPOLYGON DATA Survey teams navigated during field operations with topographic maps, aerial photographs and prismatic compass's. Point source locations marked on aerial photography in the field. Positional accuracy considered within 300m but generally below 200m depending on the terrain. Site coordinates derived by transferring site locations from aerial photographs to topographic maps and coordinates calculated. In some cases sites have been georeferenced directly from aerial photography to Google Earth Web Map Server in MapInfo or ArcGIS. POINT SOURCE DATA 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 describe these sites, then the dominant soil is chosen. 0Original map unit boundaries delineated from aerial photographs and stereoscope interpretation. Map units transferred to topographic map sheets via a mapograph. Original maps were hardcopy only. With the advent of geographic information systems polygons were digitised by rectifying the original hard copy maps. Map unit boundaries derived using hard copy aerial photography and stereoscope, satellite imagery (post 1993), geological and topographic maps. Field data (site data) described and classified according to national standards at the time of capture. Map unit polygons were digitised using geographic information system (ESRI ArcGIS 9.3) from hardcopy map. Limited attribute values describe each polygon, however further details may be available in the published survey report.