Marine Subaqueous and Intertidal Areas of Tasmania with potential to contain Acid Sulfate Soils
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Creation Date: |
18-12-2009 | ||||
Publication Date: |
18-12-2009 | ||||
Revision Date: |
18-12-2009 | ||||
Abstract |
A NHT (National Heritage Trust) funded project headed by the NRM Cradle Coast to delineate marine subaqueous and intertidal areas with potential to contain Acid Sulfate Soils (ASS). The dataset forms part of the larger project pertaining to ‘Tasmanian Acid Sulfate Soils Information’ (TASSI) with the aim of providing better awareness to stake holders and planners in regards to the distribution of Acid Sulfate Soils in marine subaqueous and intertidal environments of Tasmania. Marine subaqueous and intertidal environment for the sake of the TASSI project was defined as the seaward zone below the high water (tidal) mark and extending into the sub-tidal zone. The dataset comprises polygons mapped at the 1:25,000 scale and geo-referenced to the GDA94 datum. Each polygon is attributed with a descriptor/code that describes the ASS landscape that a polygon represents as well as the probability of the occurrence of ASS. The descriptor/code pertains to the Atlas of Australian Acid Sulfate Soils (developed in part by CSIRO and used on the ASRIS website, http://www.asris.csiro.au ). Ancillary dataset information that were used to model and derive the subsequent codes are embedded within the dataset attribute table. |
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Category |
environment | ||||
Keywords |
SOIL | ||||
Dataset Information |
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Dataset Created |
01-01-2008 | ||||
Dateset Completed |
01-12-2009 | ||||
Data Type |
vector | ||||
Data Coverage |
Tasmania | ||||
Coordinates |
North: -39.2
West: 143.5
East: 149.0
South: -44.0
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Lineage Statement |
1:25,000 SEAMAP habitat datasets; 1:25,000 SEAMAP bathymetric datasets; 1:25,000 Hydrographic dataset (intertidal areas). Tasmanian Quaternary Coastal Sediments Polyline Map (Geomorphic line dataset).
Map units conducive to ASS were derived from the SEAMAP habitat datasets and hydrographic dataset (i.e. soft sediments conducive to ASS) and used to form the basis of the final dataset. Areas where these datasets did not extend to (i.e. West Coast Tasmania), manual digitising of soft sediments using Google earth imagery were carried out and incorporated. In an attempt to acutely define high potential ASS areas, the Geomorphic line dataset was employed where sheltered/low energy areas were extracted and ‘polygonised’. Identified soft sediment areas were then clipped to these extents and attributed with bathymetry information and other relevant ancillary fields. The resulting areas were then classified in accord to the Atlas of Australian Acid Sulfate Soils. The final output is considered to be an accurate representation of marine subaqueous and intertidal Acid Sulfate Soils using the best digital information at hand at the time as well as input from historic and current field work reconnaissance. |
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Lineage Description |
Position Accuracy:
The final dataset uses the line work of the 1:25,000 SEAMAP habitat datasets and the 1:25,000 Hydrographic dataset (intertidal areas) to delineate prominent ASS areas. The manual digitising of soft sediments were carried out at an approximate scale of 1:25,000. Therefore, 1:25,000 spatial data: “Correct position to within +/- 25m in the final product”.
Attribute Accuracy:
Attribute accuracy is estimated to be 90%.
Logical Consistency:
All polygons, lines and point data labelled. All vertices are snapped and all polygons closed. All data is topologically related. There are no duplicates.
Completeness:
The dataset covers the entire Tasmania coastal region (except Macquarie Island) between elevations of 0 and 20m AHD. Hence, the data is complete according to the modelling process. |
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Map |
Show Map |
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Data Access |
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View Dataset |
http://maps.thelist.tas.gov.au/listmap/app/list/map?layout-options=LAYER_LIST_OPEN&cpoint=147.34,-42.85,10000&srs=EPSG:4283&bmlayer=3&layers=252 | ||||
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Licence |
Other | ||||
Licence Terms |
All graphical and digital data produced by DPIPWE are subject to Crown Copyright.
Accordingly, it is a requirement that all digital data be distributed with a Digital Data
License Agreement or a Memorandum of Understanding in the case of Government
clients. These agreements define the terms and conditions under which the client can
use the data. |
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Metadata Identifier |
0d5c098f-212a-4bd9-96fe-53509ce680f8 | ||||
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