C38328E62762F68FE040CD9B21441C58EnglishData Requests OfficerDepartment of Environment, Parks and Water SecurityGeospatial Services Branch (on behalf of department)datarequests.depws@nt.gov.au2014-02-06AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0National Groundwater Information System of the Northern Territory2012-06-26 The National Groundwater Information System (NGIS) is a national database developed though the Bureau of Meteorology (BOM) in collaborations with the states and territories. The database structure is suitable to deliver the specific formats required for the analysis of groundwater systems. The system provides specific data for all users of groundwater information and in particular directly accessible information to the BOM for National Water Accounting.
The National Groundwater Information System(NGIS) is a geodatabase for storing nationally consistent groundwater data based on the ArcHydro for Groundwater data model. Contents include:
bores
bore logs
construction logs
lithology logs
hydrogeologic units
3D bore lines
3D construction lines
georasters
geovolumes
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-26-101291382010-07-282012-06-28datasetnot knownComplete.0not knownGIS editing tools were used to rectify all overshoots and undershoots in line work. Following polygon data topological rules, checks were performed to detect flaws in the spatial data structure. The coverage was cleaned, to eliminate any duplicates arcs. The coverage was built for arcs and polygon topologies. A label errors routine was run to detect unlabelled polygons. A node errors routine was run to identify pseudo nodes and dangles. Checks were done to ensure that all classified polygons are closed, nodes are formed at intersections of lines and that each polygon has only one label. 0not knownHydrogeological Groundwater Units (HGU) are based on 1:250K & 1:2.5 million surface geology mapping of the Northern Territory. Palaeovalleys mapping accuaracy unkown. Bore location details are derived from the NT Government corporate database Hydstra. Hand held GPS have been used predominately to record bore location. Some bores have been surveyed toa higher levelof accuaracy. Some older bores were drilled prior to availability of GPS, location have been derived from topographic maps. Bore location accuracy has not been checked during this project.
0not knownHGU are not all based on geological formations. Some formations have been group to form a single HGU.
The development of HGUs will continue to develop as updated stratigraphic information becomes available.
0Hydrogeological Groundwater Units (HGU) are based on, within the water control districts (WCD), 1:250K surface geology mapping of the Northern Territory, except for separately mapped palaeovalleys and no units added which don't outcrop and quaternary sediments in place. Outside of the WCD area's HGU mapping based on Geological Units: NT 1:2.5 million surface geology except for separately mapped palaeovalleys and no units added which don't outcrop. Quaternary sediments have been stripped off. Units that don't outcrop in the NT have been added to the HGU geodatabase list.
HGU Naming Within WCD
HGU naming, in the first instance, is based on managed geological units in water allocation plans (WAP) in the WCD. The remaining units are lumped into geological units with simular hydrological characteristics.
HGU Naming Outside WCD
HGU Naming based on geological province, lithology class, undifferentiated.
Geodatabase Schema provided by the Bureau Of Meteorology (BOM).
Bore information was mainly sourced from the Northern Territory Government database Hydstra and populated into the Schema. Other sources of information such as records of all licensed bores from the Water Management Division were used to determine bore status and feature types.
Reference to technical reports, bore completions records, driller's logs, and field data such as gamma logs were made to complete stratigraphic bore interpretations.
Interpretations were undertaken by:
Natural Resources, Environment, the Arts & Sports (NRETAS)
Sinclair Knights Mertzs (SKM)
Queensland University of Technology (QUT)