Bass Strait Depth Zone Polygons at 1:250,000
dataset:
BATHYMETRY_BASS_STRAIT_POLY
This layer contains polygon features which represent depth zones in Bass Strait.
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Citation proposal Citation proposal
(2014) Bass Strait Depth Zone Polygons at 1:250,000 Department of Primary Industries https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/f4173d98-ef98-5690-b9d5-70808fcc3403 |
- Description
- Temporal
- Spatial
- Maintenance
- Format
- Contacts
- Keywords
- Resource Constraints
- Lineage
- Metadata Constraints
- Quality
- Acquisition Info
- Raster Data Details
- Raster Type Details
- Point Cloud Data Details
- Contour Data Details
- Survey Details
Simple
Description
- Title
- Bass Strait Depth Zone Polygons at 1:250,000
- Alternate title
- BATHYMETRY_BASS_STRAIT_POLY
- Purpose
- BATHYMETRY_BASS_STRAIT_POLY is a 1:250,000 polygon layer which represents subtidal relief (bathymetry). This layer will serve as a Digital Terrain Model (DTM) until more depth data can be obtained from which DTMs can be generated using automated techniques. Common uses for depth zone information include comparative analysis with fisheries catch data and representing the movement of commercial species in three dimensions. The depth information contained within this layer should not be used for navigation purposes. Vertical datum is mean sea level. The 10 metre contour and 0-10 m depth zone were interpolated by DPI Queenscliff (formerly MAFRI) using the coastline and the 20 metre contour.
- Credit
- Ralph Roob, Allister Coots
- Supplemental Information
- History: This layer replaced DEPTH250_POLYGON in March 2010 Relationship to other Datasets: The depth zones are bounded by isobaths from the BATHYMETRY_BASS_STRAIT_ARC layer.The landward boundary is the 1:250,000 coastal trace. The coastal trace is subject to change especially in areas subject to erosion or mass movement of coastal sediments. In order to create polygon depth zones, the isobaths used in this layer are a reduced set from those found in the BATHYMETRY_BASS_STRAIT_ARC layer. Not all of the isobaths in BATHYMETRY_BASS_STRAIT_ARC are complete for the entire area covered by this layer and some of the isobaths on the edge of the continental shelf are too closely spaced to practically create polygons. As a result the depth zones found in this layer cover depth ranges of between 10, 20 or 50 m depending on the gradient of the seabed and the available data. This layer does not include depths for bays and inlets with the exception of coarse scale contours for Port Phillip Bay. Depth information is available in separate 1:25,000 layers for the main bays and inlets in Victoria. Current Design Issues: All bathymetric information is collected as point features or spot depths. Isobaths are interpreted either by visual manual methods or by automated techniques. As more data becomes available the positional accuracy of isobaths should be revised. Each acquisition of depth information needs to be documented and assessed before it is incorporated in the layer. Future Design Issues: This layer is a baseline data set and future design considerations will be limited. Related Documents: None
- Status
- Completed
Temporal
Spatial
- Horizontal Accuracy
- 250m
- Code
- 4283
Maintenance
- Maintenance and update frequency
- As needed
Format
Contacts
Point of contact
Department of Primary Industries
-
David Ball (retired)
(Habitat Ecology Section Leader)
POBox 114 2a Bellarine Highway
Queenscliff
VIC
3225
Australia
Cited responsible party
No information provided.
Cited responsible party
No information provided.
Cited responsible party
No information provided.
Keywords
- Topic category
-
- Oceans
Resource Constraints
- Use limitation
- http://www.data.vic.gov.au/ The bathymetric information contained within this layer is not to be used for navigation purposes
- Classification
- Unclassified
Lineage
- Statement
- Dataset Source: Division of National Mapping - 1:250,000 National Bathymetric Map Series (1977-1986) Dataset Originality: Derived
- Description
- Collection Method: Further processing (creation of polygon topology) of the layer
- Description
- The data was generated from the 1:250,000 National Bathymetric Map Series. Polygons were generated by adding breaklines to close off isobaths and deleting isobaths of 10 metre intervals not represented in their entirety because of close spacing, especially on the continental shelf, leaving the isobaths of 50 metre intervals to represent the depth ranges. Polygon topology was built and then attributed according to the shallowest and deepest isobath forming the boundary of the depth zone. The area between the 20 metre contour and the coastline is generally unsurveyed and the source maps did not have a 10 m contour. As a result the 10 m contour and 0-10 m depth zone in this layer were created by DPI Queenscliff (formerly MAFRI) by interpolating a line between the coastline and the 20 m contour.
Metadata Constraints
- Classification
- Unclassified
Quality
Attribute Quality
- Comments
- There has been no assessment of attribute accuracy.
Positional Accuracy
- Comments
- Precision of source data (1:250,000 Natioinal Bathymetric Map Series): Horizontal accuracy 100m to 1km of well defined points. Vertical accuracy 10cm to 1m in elevation. Depths are relative to Mean Sea Level. Digital precision: Any departure between the digital and source material (measured between centre lines) will not exceed 1mm at map scale (i.e. 250m at 1:250,000) Determination: Positional accuracy is only an estimate and has not been subject to any test. The depth information within this layer should not be used for navigation purposes.
Conceptual Consistency
- Comments
- This layer exists as a single entity for Bass Strait.
Missing Data
- Comments
- Bass Strait This layer is complete for Bass Strait.
Excess Data
Acquisition Info
Raster Data Details
Point Cloud Data Details
Contour Data Details
Survey Details
Overviews
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Associated resources
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