This layer contains line features for depth contours (bathymetry) in Port Phillip Bay.

This layer contains line features for depth contours (bathymetry) in Port Phillip Bay.

BATHYMETRY_PORT_PHILLIP_ARC is a 1:25,000 layer used for depth analysis.
Ecological research requires the type of detailed information contained within the BATHYMETRY_PORT_PHILLIP_ARC layer relating to the nature of the sea bed.  Depth models have wide ranging uses in the fisheries management, development of aquaculture and ecological research.  
The depth information contained within this layer should not be used for navigation purposes.

Not determined.
The depth information within this layer should not be used for navigation purposes.

All attributes have been checked by DPI Queenscliff, and are complete

Not known

Dataset Source: Data was primarily digitised from Victorian Channels Authority charts (formerly Ports and Harbours).  The depth charts digitised to create the layer are listed below.

Depth Contours
VC55.04.  Port Phillip Entrance.  Scale 1:25,000.  Surveyed 1971-1985: Contours are in metres and show depths 0.875 m below A.H.D.

VC55.05.  St. Leonards to Clifton Springs.  Scale 1:25,000.  Surveyed 1976-1984: Contours are in metres and show depths 0.875 m below A.H.D

VC55.06.  Geelong Harbour and Approaches.  Scale 1:25,000.  Surveyed 1971(Port of Geelong Authority): Contours are in metres and show depths 0.441 m below A.H.D

VC55.07.  Kirk Point to Werribee River.  Scale 1:25,000.  Surveyed 1976-1985: Contours are in metres and show depths 0.524 m below A.H.D

VC55.08.  Werribee South to Skeleton Creek.  Scale 1:25,000.  Surveyed 1979-1985: Contours are in metres and show depths 0.524 m below A.H.D

2927.  Point Cook to Altona (sheet 2).  Scale 1:5,000.  Surveyed 1984-1985: Soundings are in decimetres. Datum for soundings is 3.227 metres below the capping of the Altona pier and 0.524 metres below A.H.D.

2926.  Point Cook to Altona (sheet 1).  Scale 1:5,000.  Surveyed 1984-1985: Soundings are in decimetres. Datum for soundings is 3.227 metres below the capping of the Altona pier and 0.524 metres below A.H.D.

PP174-1997.  Altona Bay - Altona Pier Approach.  Scale 1:5,000.  Surveyed 1977-1979: Soundings are in decimetres. Datum for soundings is 3.227 metres below the capping of Altona pier, which is 0.524 metres below A.H.D. Additional information July 1981 and February 1982.

PP164-1919.  Williamstown Beach  Scale 1:5,000.  Surveyed April 1977: Soundings are in decimetres. Datum for soundings is L.W.O.S.T. Williamstown, which is 0.524 metres below A.H.D. Additional information June 1979, February 1981, July 1981, October 1981.

28675.  Approach to Breakwater - West of Channel (Ch.9310 to Ch.12250m).  Scale 1:2,500.  Surveyed 1997: Contours are in metres and show depths 0.524 m below A.H.D

28674.  Approach to Breakwater Pier - West of Channel (Ch.9310 to Ch.14710m).  Scale 1:5,000.  Surveyed 1997: Contours are in metres and show depths 0.524 m below A.H.D.

2689.  Hobsons Bay - Webb Dock to Kerferd Rd Pier.  Scale 1:5,000.  Surveyed March-April 1982: Soundings are in decimetres. Datum for soundings is L.W.O.S.T. Williamstown, which is 0.524 metres below A.H.D. 

29070.  Yarra River to Kerferd Rd.  Scale 1:5,000.  Surveyed July August 1998: Contours are in metres and show depths 0.524 m below A.H.D

VC55.10.  Mordialloc to South Melbourne.  Scale 1:25,000. Contours are in metres and show depths 0.875 m below A.H.D

VC55.11.  Ranelagh Beach to Mordialloc Creek.  Scale 1:25,000.  Surveyed 1972-1985: Contours are in metres and show depths 0.875 m below A.H.D

3051.  Seaford North to Patterson River.  Scale 1:5,000.  Surveyed 1985-1986: Soundings are in metres and decimetres. Datum for soundings is 2.89 metres below the capping on the outer face of Frankston pier and 0.524 metres below A.H.D.

3053.  Seaford South to Seaford North.  Scale 1:5,000. Surveyed 1985-1986: Soundings are in metres and decimetres. Datum for soundings is 2.89 metres below the capping on the outer face of Frankston pier and 0.524 metres below A.H.D.

3052.  Frankston to Seaford South.  Scale 1:5,000.  Surveyed 1985-1986: Soundings are in metres and decimetres. Datum for soundings is 2.89 metres below the capping on the outer face of Frankston pier and 0.524 metres below A.H.D.

2570.  Frankston to Daveys Bay.  Scale 1:5,000.  Surveyed 1981 and 1986: Soundings are in metres and decimetres. Datum for soundings is 2.89 metres below the capping on the outer face of Frankston pier and 0.524 metres below A.H.D.

3110.  Moondah Beach to Pelican Point.  Scale 1:5,000.  Surveyed 1986: Soundings are in metres and decimetres. Datum for soundings is 0.524 metres below A.H.D., which is 2.396 metres below the capping on the Mornington Yacht Club jetty.

3111. Mills Beach East to Moondah Beach.  Scale 1:5,000.  Surveyed1986: Soundings are in metres and decimetres. Datum for soundings is 0.524 metres below A.H.D., which is 2.396 metres below the capping on the Mornington Yacht Club jetty.

VC55.12.  McCrae to Moondah Beach.  Scale 1:25,000.  Surveyed 1972-1985: Contours are in metres and show depths 0.875 m below A.H.D

VC55.13.  Blairgowrie to Rosebud.  Scale 1:25,000.  Surveyed 1972-1985: Contours are in metres and show depths 0.875 m below A.H.D

For those areas not covered by the above charts, additional depth information was sourced from the following navigation charts.

Aus143.  Port Phillip.  Scale 1:100,000.  Surveyed 1967 (RAN survey) and 1970 (Ports and Harbours Authorities survey): Depths are in metres and are reduced to Chart Datum, which is approximately the level of Indian Spring Low Water.

Aus 154.  Port Melbourne-Williamstown and Yarra River.  Scale 1:7,500.  Surveyed 1949 (RAN survey) and 1984 (Port of Melbourne Authority): Depths are in metres and are reduced to Chart Datum, which is approximately the level of Lowest Astronomical Tide.

Aus 155.  Approaches to Melbourne.  Scale 1:37,500.  Surveyed 1967 (RAN survey) and 1985 (Ports and Harbours): Depths are in metres and are reduced to Chart Datum, which is approximately the level of Indian Spring Low Water.

Aus 158.  Entrance to Port Phillip.  Scale 1:37,500.  Surveyed 1967 (RAN survey) and 1969 (Ports and Harbours): Depths are in metres (under twenty-one in metres and decimetres) reduced approximately to Indian Spring Low Water (chart datum).


Dataset Originality: Primary & Derived

                            
                              History: This layer replaced PP_BATHYMETRY in March 2010

Relationship to other Datasets: The BATHYMETRY_PORT_PHILLIP_BAY layer draws on information stored within the SHORE25 and HYDRO25 layer.  The coastline is subject to change especially in areas subject to erosion or mass movement of coastal sediments.

Current Design Issues: Bathymetric information is initially 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 base line data set and future design considerations will be limited.

Related Documents: None