Metadata : National Groundwater Information System of the Northern Territory

Index:


Metadata Details:

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

Version: 1.0

Date Metadata Extracted: 2020-09-23

Date Metadata Last Updated: 2014-02-06

Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=C38328E62762F68FE040CD9B21441C58

Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=C38328E62762F68FE040CD9B21441C58


Citation

ANZLIC Identifier: C38328E62762F68FE040CD9B21441C58

Title: National Groundwater Information System of the Northern Territory

Citation Date: 2012-06-26

Date Type: creation

Custodian: Department of Environment and Natural Resources


Description

Abstract:

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

ANZLIC Search Words:

Spatial Domain:

Bounding Coordinates:


Dataset Status

Dataset ID:

Language: English

Character Set: Latin 1

Progress: completed

Maintenance and Update Frequency: asNeeded

Data Currency Start Date: 2010-07-28

Data Currency End Date: 2012-06-28

Access Constraint:

Download the spatial data package (contains spatial data, maps and reports) via https://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: 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 and Natural Resources. Copyright Northern Territory Government.


Data Quality

Lineage: Hydrogeological 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)

Positional Accuracy: Hydrogeological 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.

Attribute Accuracy: HGU 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.

Logical Consistency: GIS 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.

Completeness: Complete.


Contacts

NameOrganisationPositionRolePhoneFaxEmail
Data Requests OfficerDepartment of Environment and Natural ResourcesGeospatial Services Branch, Water Resources Divisiondistributordatarequests.denr@nt.gov.au

Data Dictionary

AttributeAttribute DescriptionPossible CodeCode Description
BoreHasBoreLinesDefines the relationship between bores (2D points) and borelines (3D lines). The NGIS_Bore feature class contains multi-pipe (i.e. bores monitoring or pumping several aquifers independently) and multiple-hole bores (i.e. nested bores with different holes). Each pipe or hole is represented as a separate bore feature. There may be several interpretations of the hydrostratigraphy resulting in several bore lines for the same bore. For multi-pipe and multi-hole bores, the bore line is repeated for each pipe or hole and potentially multiple interpretations of the hydrostratigraphy.
BoreHasBoreholeLogs.Defines the relationship between bores (2D points) and interpreted hydrogeological logs (table). The NGIS_Bore feature class contains multi-pipe (i.e. bores monitoring or pumping several aquifers independently) and multiple-hole bores (i.e. nested bores with different holes). Each pipe or hole is represented as a separate bore feature. Each bore feature can have one or more bore logs; multiple bore logs can result from different interpretations of the hydrostratigraphy.
BoreHasConstructionLines.Defines the relationship between bores (2D points) and construction lines (3D lines). Each NGIS_Bore feature can have several construction components (e.g. hole, screen, casing, packing material), which can be represented in a 3D construction line. The NGIS_Bore feature class contains multi-pipe (i.e. bores monitoring or pumping several aquifers independently) and multiple-hole bores (i.e. nested bores with different holes). Each pipe or hole is represented as a separate bore feature. For multi-pipe and multi-hole bores, the construction line is repeated for each pipe or hole.
BoreHasConstructionLogsDefines the relationship between bores (2D points) and construction logs (table). The NGIS_Bore feature class contains multi-pipe (i.e. bores monitoring or pumping several aquifers independently) and multiple-hole bores (i.e. nested bores with different holes). Each pipe or hole is represented as a separate bore feature. Each NGIS_Bore feature can have several construction components (e.g. screen, casing, packing material) stored in the construction log. Although in reality the pipes in a multi-pipe bore can share construction elements, the same information is repeated in the construction log table for each bore feature.
BoreHasLithologyLogsDefines the relationship between bores (2D points) and lithology logs (table). The NGIS_Bore feature class contains multi-pipe (i.e. bores monitoring or pumping several aquifers independently) and multiple-hole bores (i.e. nested bores with different holes). Each pipe or hole is represented as a separate bore feature. Although in reality the pipes in a multi-pipe bore can share a single lithology log, the same log is repeated in the lithology log table for each bore feature. In addition, each bore feature may have more than one lithology log. For example, there may be a driller's and geologist's log.
CoreThe Core feature dataset contains bore points, bore lines, construction lines and associated relationship classes.
HGUHasBoreLinesDefines which hydrogeologic units are intersected by borelines.
HGUHasGeoVolumes.Defines which hydrogeologic units have geovolumes (multipatch features representing 3D HGU geometry).
HydrostratigraphyThe Hydrostratigraphy feature dataset contains hydrostratigraphy feature classes e.g. GeoVolumes.
NGISAndGeorasters.Defines which hydrogeologic units have georasters (rasters of HGU properties).
NGIS_Bore.NGIS_Bore is a point feature class in which each point that represents the location of a bore feature and associated attributes. A bore is defined as having a single x, y and z location:
' Multiple independently screened outlets or pipes (i.e. that can be pumped and/or metered separately) are regarded as a separate bore feature.
' Multiple holes associated with the same jurisdictional bore identifier are regarded as a separate bore feature.
NGIS_BoreLineNGIS_BoreLine is a 3D line that represents the hydrogeologic units (HGUs) along a borehole. It is derived from the BoreholeLog table.
NGIS_BoreholeLog.NGIS_BoreholeLog is a table with strata classified into hydrogeological units along a borehole i.e. interpreted bore logs. The BoreholeLog table contains bores with interpreted stratigraphy. A bore must be represented in the BoreholeLog table in order for BoreLine features to be created for that bore. There may be multiple stratigraphic interpretations of a LithologyLog for each bore, which are distinguished by the Scenario field.For each unique stratigraphic interpretation in the BoreholeLog table, there is one record for each stratum. Each stratum record for a bore has the same field value for BoreID, RefElev, but the differing values for FromDepth, ToDepth, TopElev, BotElev and HGUID.
NGIS_ConstructionLineNGIS_ConstructionLine is a 3D line that represents the construction information (e.g. hole, casing, screen, packing material, cement) along a borehole. It is derived from the NGIS_ConstructionLog table.
NGIS_ConstructionLog.NGIS_ConstructionLog is a table with bore construction information (e.g. hole, casing, screen, packing material, cement) along a borehole. A bore feature must be represented in the ConstructionLog table in order for ConstructionLine features to be created for that bore. Each construction component recorded in the ConstructionLog must have FromDepth, ToDepth, TopElev and BottomElev to be valid. Construction components may overlap.
NGIS_GeoRastersNGIS_GeoRasters is a catalogue of raster datasets describing properties of hydrogeologic units e.g. depth to/elevation of top or base, salinity, yield, potentiometry
NGIS_GeovolumeNGIS_Geovolume is a multipatch representing volume objects within the subsurface e.g. hydrogeologic units (HGUs), hydrogeologic complexes (HGCs).
NGIS_HydrogeologicUnit.NGIS_HydrogeologicUnit is a reference table describing the hydrologic units (HGUs) and their relationship to aquifers. HydroID is the unique key for this table. There is a unique HydroID for each combination of HGUName (or HGUNumber) and ProvName.
NGIS_LithologyLog.NGIS_LithologyLogis a table with driller's or geologist's description of strata along a borehole.As a bore can have both driller's and lithology log, there can be more than one LithologyLog for each bore. The LithologyLog can be interpreted to create one or more BoreholeLogs i.e. lithological units are interpreted and associated with HGUIDs.Each lithological record for a bore has the same field value for BoreID and RefElev, but the differing values for FromDepth, ToDepth, TopElev and BottomElev.
NGIS_ManagementZone.NGIS_ManagementZone is a polygon feature class that represents the groundwater management zones e.g. Water Control Districts (NT), Prescribed Wells Areas (SA).

Supplementary Information

1. Sinclair Knights Merz 2011. Interpretation of Bore Hole Stratigraphy to Develop a National Groundwater Information Compliant Database

2. Nation E 2011. Draft NGIS Core Data Dictionary Version 2.1.

This record maintained using the NTLIS Metadata Tool