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Identification

Field Value

Title

Estuaries

Alternative title(s)

MER Estuaries

Abstract

The Estuaries datasets contain the water boundary of each estuary in NSW up to its tidal limits and includes areas vegetated with the macrophytes seagrass, mangrove, and saltmarsh. A survey of the tidal limits was carried out between 1996 and 2005 by Manly Hydraulics Laboratory on behalf of the former Department of Natural Resources. Coordinates of the tidal limits were mapped, tributary waterway areas extended up to the surveyed tidal limits, and a boundary digitised between the upper (fluvial) catchment draining directly to the river system above the tidal limits and the lower (estuarine) catchment draining directly to the estuary and its tributaries. The catchment area draining into each estuary has been defined as two GIS spatial layers - EstuaryDrainageCatchmentBdy (line feature) and EstuaryDrainageCatchment (polygon feature) - based on the digitising of catchments for the NSW Stressed Rivers Assessments conducted for the water sharing plan process. ; ; A nine stage method was used to create the Estuaries(Macrophytes) dataset and details how existing spatial data were combined from a number of agencies and projects and developed through consultation with the existing knowledge base of individuals and reports. Two datasets with polygon features were created, one including the extent of the three different macrophyte types, the other merging macrophyte extent with the estuary water surface (this dataset). These layers were required for calculating basic physical characteristics of each estuary such as area, depth, volume, dilution and flushing; modelling of catchment runoff; development of a new chlorophyll response-based classification system for NSW estuaries and normalising pressures for valid comparisons between estuaries. Separate fluvial and estuary catchments were required for future investigation of causal relationships between catchment pressures above or below the tidal limits and estuary health.

Resource locator

NSWEstuaries20110331

Name: NSWEstuaries20110331

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Data download package

Function: download

ArcGIS REST Service

Name: ArcGIS REST Service

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

An ArcGIS Server web service represents a GIS resource such as a map, locator, or image that is located on an ArcGIS Server site and is made available to client applications. Depending on the layers enabled, this web service allows a user to query its features and/or visualise the dataset. This service is aimed at advanced geographical information users, and will require access to geographical information system (GIS) software such as ArcGIS/ArcMap.

Function: download

Unique resource identifier

Code

1a48d3ba-f1c7-4ade-914d-5de052f78462

Presentation form

documentDigital

Edition

Version 1

Dataset language

eng

Metadata standard

Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Version

1.1

Dataset URI

https://datasets.seed.nsw.gov.au/dataset/1a48d3ba-f1c7-4ade-914d-5de052f78462

Purpose

This estuary dataset was developed under a new Monitoring, Evaluation and Reporting (MER) Program initiated by the NSW Government in 2007 to assess and better manage the health of natural resources across the State. The MER Program is in response to the NSW Natural Resources MER Strategy which has the objective of providing appropriate information for decision-making by natural resource managers.

Status

completed

Spatial representation

Type

vector

Geometric Object Type

curve

Geometric Object Count

0

Spatial reference system

Authority code

GDA94 Geographic (Lat\Long)

Code identifying the spatial reference system

4283

Spatial resolution

50 m

Additional information source

This mapping was done as part of the NSW Monitoring Evaluation and Reporting Program - Estuaries Theme;;REPORT_NSWEstuariesCatchments.doc

Classification of spatial data and services

Field Value

Topic category

Water

Keywords

Field Value

Keyword set

keyword value

WATER

WATER-Rivers

MARINE-Coasts

Originating controlled vocabulary

Title

ANZLIC Search Words

Reference date

2008-05-16

Geographic location

West bounding longitude

148.7629

East bounding longitude

153.866

North bounding latitude

-37.9713

South bounding latitude

-27.9886

NSW Place Name

NSW

Vertical extent information

Minimum value

-100

Maximum value

2228

Coordinate reference system

Authority code

urn:ogc:def:cs:EPSG::

Code identifying the coordinate reference system

5711

Temporal extent

Begin position

2008-01-01

End position

N/A

Dataset reference date

Date type

creation

Effective date

2008-04-24

Date type

publication

Effective date

2010-12-28

Date type

revision

Effective date

2010-12-28

Resource maintenance

Maintenance and update frequency

notPlanned

Contact info

Organisation name

Department of Planning, Industry and Environment

Full postal address

PO Box A290

Sydney South

NSW

1232

Australia

data.broker@environment.nsw.gov.au

Telephone number

131555

Facsimile number

02 9995 5999

Email address

data.broker@environment.nsw.gov.au

Responsible party role

pointOfContact

Quality and validity

Field Value

Lineage

The initial stage in developing the Estuaries datasets was to create hydrological catchment layers comprising line (EstuaryDrainageCatchmentsBdy) and polygon (EstuaryDrainageCatchments) feature classes. These initial datasets defined a true representation of the hydrological catchment/watershed for NSW coastal estuaries.; ; Whilst there was a clear goal at the beginning of the project the output datasets were not specified, nor were the methods or datasets from which they would be produced. Instead the project has evolved as datasets have become available and input has been received on the suitability and usability of certain themes. ; ; Stage 1: Defining the Estuarine and Freshwater Waterbodies.; The areas representing the estuarine and freshwater waterbodies were defined using Waterbody Area from TOPO_DELIVERY.HydroArea(LPMA) and Tidal and Mangrove Limit, Survey of Tidal Limits and Mangrove Limits in NSW estuaries 1996 to 2005. Only continuous waterbodies located downstream of the tidal limits (Tidal and Mangrove Limit - DNR, 2006) were selected. Waterbodies that intersected the tidal limit were cut and attributed separately with a designation of Freshwater for those sections upstream of the tidal limit. Before cutting the waterbodies the following information was referred to: location of the tidal limit points, location descriptions in the attribute table and a topographic image.; NB. In the course of the project several errors with the topographic water body boundary were identified. ; ; Stage 2: Unioning the Hydrological Catchments & Waterbodies. The EstuaryDrainageCatchments and estuarine and freshwater waterbodies created in Stage 1 were combined through use of the union command. This created a combined spatial layer representing estuarine waterbodies and catchments and freshwater waterbodies.; ; Stage 3: Inclusion of NSW Macrophyte Mapping. ; After consideration it was decided that the incorporation of macrophyte information with the waterbody layer would more accurately represent the estuarine area. This produced a dataset which could assist in estuarine modelling. The macrophyte information comprising areas of seagrass (predominantly inundated), mangrove (regularly inundated) and saltmarsh (occasionally inundated) from the NSW Department of Primary Industries (DPI) Macrophyte (2005) spatial layer (Estuarine_Macrophytes) was incorporated into the temporary hydrological catchments and waterbody layer.; ; This Macrophyte layer did not provide coverage for the Sydney Central Coast area of NSW. A gap existed between the Hunter River and Bellambi Lake catchments, leaving a total of 35 catchments whose estuarine boundary were not altered by the inclusion of macrophyte information. In addition to the Central Coast gap there were a further 36 catchments along the coast that did not have Macrophyte information. ; ; Stage 4: Inclusion of Central Coast Macrophyte Mapping (DPI, 2008). ; Supply of the draft NSW Department of Primary Industries (DPI) Macrophyte 2008 spatial information allowed updating of the estuarine areas for the Central Coast area of NSW from the Hunter River (NthSthNo 60) to Bellambi Lake (NthSthNo 97). The processes and checks were the same as those carried out in Stage 3. Catchments for which macrophyte information did not exist are:; Glenrock Lagoon,; Middle Camp Creek,; Moonee Beach Creek,; Avoca Lake,; Curl Curl Lagoon,; Wattamolla Creek,; Hargraves Creek,; Stanwell Creek,; Stoney Creek,; Flanagans Creek,; Hewitts Creek (Nil Estuary),; Woodlands Creek,; Slacky Creek,; Whartons Creek (Nil Estuary),; Collins Creek (Nil Estuary),; Bellambi Gully,; Bellambi Lake.; ; Stage 5: Representation to CMA region.; The large file size and number of polygons within the dataset, meant that the final layer was difficult to manage. To increase manageability and processing speeds it was decided to represent the dataset through 3 feature classes based on Catchment Management Authority regions. The relevant catchments were selected and exported to create the files:; Northern Rivers; ; Sydney Metro, Hawkesbury-Nepean, and Hunter-Central Rivers;; *Southern Rivers. ; ; Stage 6: Extending Estuarine areas to the Tidal Limit.; A shortcoming in the datasets from the previous stage is that not all estuarine areas extend to the tidal limit as defined by the Tidal and Mangrove limit (DNR, 2006) dataset. The purpose of Stage 6 was to create a continuous estuarine area from the Tidal Limit to the ocean or bay. It should be noted that the edits here did not involve altering whether an estuarine mouth was open to the sea or not. It did, however, result in continuous estuarine areas flowing into bays.; Any gaps in the dataset were identified and drainage lines were selected from TOPO_DELIVERY.HydroLine and buffered by a width of 0.5m giving a total stream width of 1m. The union command was then used to combine these buffered areas with the three CMA datasets created in Stage 5.; ; Stage 7: Defining Estuarine & Non Estuarine Hydrological Catchment Areas.; Defining the catchment boundaries was undertaken by Graeme Short, Natural Resource Project Officer. Graeme has extensive experience in API and used this knowledge to subdivide the existing catchment areas into estuarine and non estuarine (freshwater) catchments. The boundaries were created through on screen digitising with reference to both the topographic contour and drainage layers. The process is very subjective and dependent on the experience of the individual doing the assessment and their ability to remain consistent in their method. There were also a number of constraints with the major one being the limited number of tidal limit points occurring on the smaller tributaries. The other constraint hindering interpretation were those areas which have an altered landscape. These landscapes usually occur on the flatter alluvial areas and have altered watercourses and man-made canals. Examples of these occur in the larger catchments on the North Coast and the Shoalhaven River on the South Coast. For these reasons it is difficult to correctly identify the catchment areas with the end product over exaggerating the total estuarine area. Table 26 identifies those catchments where no catchment was defined due to the absence of tidal limit points.; As stated above the process is a manual one and the outcome may not appropriately represent catchment areas as they occur in the real world. The only current method available that could be used to deliver an improved product would be the use of LiDAR or DEM in conjunction with an increased number of tidal limit points on key tributaries.; ; Stage 8: Creating a Simplified Representation of the Estuarine Area.; The inclusion of the macrophyte information created an intricate and large spatial layer. The purpose of simplifying this layer was to remove the internal estuarine detail, creating a generalised waterbody for each estuary. This process was performed by dissolving all internal estuarine boundaries and merging the three CMA areas.

Constraints related to access and use

Field Value

Constraint set

Use constraints

This data is provided under a Creative Commons Attribution 4.0 licence http://creativecommons.org/licenses/by/4.0 Attribute 'Department of Planning, Industry and Environment ' in publications using this data.

Limitations on public access

Data Quality

Field Value

Scope

dataset

Completeness Commission

Date type

revision

Effective date

2001-01-01

Explanation

Completeness Ommission

Date type

revision

Effective date

2001-01-01

Explanation

Responsible organisations

Field Value

Responsible party

Contact position

Data Broker

Organisation name

Department of Planning, Industry and Environment

Full postal address

PO Box A290

Sydney South

NSW

1232

Australia

data.broker@environment.nsw.gov.au

Telephone number

131555

Facsimile number

02 9995 5999

Email address

data.broker@environment.nsw.gov.au

Web address

http://www.planning.nsw.gov.au/

Responsible party role

pointOfContact

Metadata on metadata

Field Value

Metadata point of contact

Contact position

Data Broker

Organisation name

Department of Planning, Industry and Environment

Full postal address

PO Box A290

Sydney South

NSW

1232

Australia

data.broker@environment.nsw.gov.au

Telephone number

131555

Facsimile number

02 9995 5999

Email address

data.broker@environment.nsw.gov.au

Responsible party role

distributor

Metadata date

2008-04-24

Metadata language

eng