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Metadata : Sinkholes of the Northern Territory |
Index:
Metadata Details:
Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile
Version:1.0
Date Metadata Extracted:2024-05-05
Date Metadata Last Updated:2023-10-05
Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=0E1236F73FA83CBDE050CD9B214471B0
Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=0E1236F73FA83CBDE050CD9B214471B0
Citation
ANZLIC Identifier:0E1236F73FA83CBDE050CD9B214471B0
Title: Sinkholes of the Northern Territory
Citation Date:2014-09-30
Date Type:creation
Custodian:Department of Environment, Parks and Water Security
Description
Sinkholes are depressions in the landscape related to collapse features in underlying limestone or dolostone rock formations. These rocks are prone to dissolution by slightly acidic rainwater over geological timescales. Cavities form in the rock ranging in scale from microscopic to cave systems. Sinkholes form when the cavities grow to the extent that the rock above collapses.
The reason this dataset was compiled is that sinkholes are a good indicator of underlying limestone or dolostone, which often host important aquifers. The sinkholes provide one method for delineating karstic aquifers which in many cases either outcrop poorly or are covered by younger rocks.
- geoscientificInformation
Bounding Coordinates:
- North Bounding Coordinate:-10
- South Bounding Coordinate:-26
- East Bounding Coordinate:138
- West Bounding Coordinate:129
Dataset Status
Dataset ID:
Language:English
Character Set: Latin 1
Progress:completed
Maintenance and Update Frequency:asNeeded
Data Currency Start Date:2014-09-30
Data Currency End Date:2019-02-21
Access Constraint:Download the spatial data package (contains spatial data, maps and reports) via 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: 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.
Disclaimer: This dataset should not be used for hazard assessment purposes. The presence of a sinkhole may or may not pose a hazard to infrastructure such as buildings, roads or railway lines. Such assessments should only be carried out by appropriately qualified engineers and would normally involve detailed site investigations.
Data Quality
Lineage:The features described here as sinkholes here mainly comprise wide, circular to oval shaped, flat bottomed, shallow depressions. They range in up to 2km in diameter and never have subterranean openings. Many of these hold water during the wet season and some throughout the year. These have mainly been delineated using Google Earth. Other types of sinkholes identified are depressions up to 100m in diameter which may or may not have subterranean openings at their bases and can have steep sides. These have been mapped by field inspections. Caves have also been included in this dataset and have been mapped by field inspections and also taken from previously identified ones on topographic and geological maps.
Positional Accuracy:Varies from 3 - 10 metres for sites located with GPS to +/- 250 metres for sites located using satellite imagery.
All sinkhole locations defined in this spatial dataset should be field verified for development purposes.
Attribute Accuracy:The accuracy of the sites attribute information is considered low.
Logical Consistency:Some of the attribute categories such as "Type" are preliminary only and may be changed in the future.
Completeness:Continually updated and maintained.
Contacts
Name Organisation Position Role Phone Fax Data Requests Officer Department of Environment, Parks and Water Security Geospatial Services Branch (on behalf of department) distributor datarequests.depws@nt.gov.au
Data Dictionary
Attribute Attribute Description Possible Code Code Description AREA_CLASS Range of area in square metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002. AREA_M2 Area at ground level in square metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002. DEPTH Depth of depression in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002.
DESC Field observations and description of the sinkholes. DIAM_RNG Diameter range. Range of diameter in metres at surface level. GEOLOGY Geological formation associated with the sinkholes. L1 Longest part of long axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002. L1_L2 Total length of long axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002. L2 Shortest part of long axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002. LATITUDE Position of bore in Geographic coordinates in GDA94(decimal degrees) LONGITUDE Position of bore in Geographic coordinates in GDA94(decimal degrees) ORIEN Orientation of long axis in degrees as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002. PHOTOS Indicates if photos available in Water Resources photo collection (not for public use) RATIO Ratio of long to short axis(L1+L2/Wmax) as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002.
SOURCE Source of the information about the sinkholes. SURVEY_ID Water Resources Division water resources survey identification code. SURVEY_NME Report, study or map referencing the sinkholes. TYPE Hole Type. 1. Sinkhole up to 100m diameter - diameter may or may not be specified, open or closed at base. 2. Sinkholes less than 10m diameter - diameter less than 10m, open or closed at base. 3. Cave(s) 4. Broad depression - never open at base, may or may not support lagoon W1 Longest part of short axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002.
W1_W2 Total length of short axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002.
W2 Shortest part of short axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002.
WAYPOINT Waypoint (not for public use). W_MAX Maximum length of short axis in metres as stated in: Karp, D. (Feb, 2002) Land Degradation associated with sinkhole development in the Katherine Region. Technical Report No 11/2002.
ZONE Zone.
Supplementary Information
For information about sinkholes in the Katherine region, refer to:
BIB. REFERENCE Karp, D. (Feb, 2002). LAND DEGRADATION ASSOCIATED WITH SINKHOLE DEVELOPMENT IN THE KATHERINE REGION. Technical Report No 11/2002, Resource Assessment Branch, Department of Infrastructure, Planning and Environment, Darwin, Northern Territory. The report is stored in the Northern Territory Library archives and may be downloaded (pdf) via this URL hdl.handle.net/10070/229127.
Metadata record: www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=0E1236F73FA83CBDE050CD9B214471B0
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