NSW Positioning Theme Survey Mark GDA2020

Please Note

WGS 84 = GDA94 service

This dataset has a spatial reference of [WGS 84 = GDA94] and can NOT be easily consumed into GDA2020 environments. A similar service with a ‘multiCRS’ suffix is available which can support GDA2020, GDA94 and WGS84 = GDA2020 environments. In due course, and allowing time for user feedback and testing, it is intended that these original services will adopt the new multiCRS functionally.

The NSW Survey Marks web service is a dynamic map of permanent survey marks that constitute the state control survey. The positioning data under the NSW Foundation Spatial Data Framework (FSDF) is fed to the web service by the Survey Control Information Management System (SCIMS), the database that contains the single source of truth for all marks within the state control survey network.

This service provides GDA2020 coordinates, heights and related information for NSW survey marks that form the official State control survey network (as reported in SCIMS), plotted in their GDA2020 locations (equivalent to WGS84@2020). This service controls the precision of numerical output in a manner that mirrors SCIMS Online.

The web service provides a wealth of data on each mark, including:

mark type (Permanent Mark, State Survey Mark, etc.)
mark number
horizontal coordinates and their accuracy (class and order)
heights and their accuracy (class and order)
status of the mark (destroyed, restricted access, etc.)

The mark type is represented using various shapes and the accuracy of the mark (both vertical and horizontal) is communicated by the colour.

This web service allows users to easily integrate survey control mark data from SCIMS into Open Geospatial Consortium (OGC) compliant spatial platforms and applications.

Data provided by the NSW Survey Mark web service can be used in a variety of engineering and surveying applications, including but not limited to:

cadastral survey planning
flood studies and hydrographic modelling
infrastructure development
site calibration at construction sites
elevation modelling
preservation of survey infrastructure.

The NSW Survey Mark web service gives users an alternative method to access state control survey data that can be incorporated into their GIS package without needing to log into SCIMS Online.

Please note that SCIMS Online is the official option for obtaining state control survey data for cadastral surveys as it offers legal traceability. SCIMS online is accessible via the Spatial portal.

Metadata

Type	Web Mapping Service (WMS)
Update Frequency	As required
Contact Details	Contact us via the Spatial Services Customer Hub
Relationship to Themes and Datasets	Positioning Theme of the Foundation Spatial Data Framework (FSDF), Survey Control Information Management System (SCIMS)
Accuracy	The dataset maintains a positional relationship to, and alignment with, the Lot and Property digital datasets. This dataset was captured by digitising the best available cadastral mapping at a variety of scales and accuracies, ranging from 1:500 to 1:250 000 according to the National Mapping Council of Australia, Standards of Map Accuracy (1975). Therefore, the position of the feature instance will be within 0.5mm at map scale for 90% of the well-defined points. That is, 1:500 = 0.25m, 1:2000 = 1m, 1:4000 = 2m, 1:25000 = 12.5m, 1:50000 = 25m and 1:100000 = 50m. A program of positional upgrade (accuracy improvement) is currently underway.
Spatial Reference System (dataset)	Geocentric Datum of Australia 2020 (GDA2020), Australian Height Datum (AHD)
Spatial Reference System    (web service)	EPSG 7844: GDA2020
WGS84 Equivalent To	GDA2020
Spatial Extent	Full state
Standards and Specifications	Open Geospatial Consortium (OGC) implemented and compatible for consumption by common GIS platforms. Available as either cache or non-cache, depending on client use or requirement. The web service is built as per Spatial Services project specification.
Distributors	Service Delivery, DCS Spatial Services 346 Panorama Ave Bathurst NSW 2795
Dataset Producers and Contributors	Survey Operations, DCS Spatial Services 346 Panorama Ave Bathurst NSW 2795

NSW Positioning Theme Survey Mark GDA2020

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