NSW Elevation and Depth Theme – Historical 20m Contours

Please Note
WGS 84 service aligned to GDA94
This dataset has spatial reference [WGS 84 ≈ GDA94] which may result in misalignments when viewed in GDA2020 environments. A similar service with a ‘multiCRS’ suffix is available which can support GDA2020, GDA94 and WGS 84 ≈ GDA2020 environments.
In due course, and allowing time for user feedback and testing, it is intended that the original service name will adopt the new multiCRS functionally.

20m Historical Contours are Contours that were captured in a verity of methods as initially captured at 1:25 000, 1:50 000 and 1:100 000 scales from stereoscopic aerial photography or Ortho image trace methods.

These contours were digitised into the vector data product over a number of years with the processing being completed 2003 through to 2017.

Feature reliability date of the original contours range from 1971 through to 2008.

Contours are virtual imaginary lines on the ground, joining points of an equal elevation in relation to the Australian Height Datum (AHD). A contour can be a standard contour, depression contour or an ancillary contour. It is a part of the NSW Elevation and Depth Theme.

Elevation and Depth provides an authoritative digital representation of the Earth’s surface enabling evidence based decision making, policy development and an essential reference to other foundation datasets.

Elevation and Depth underpins:

· safe hydrographic, aeronautical and road navigation

· climate science, including climate change adaptation

· emergency management and natural hazard risk assessment

· environmental, including water management

· definition of maritime and administrative boundaries

· defence and national security

· natural resource exploration and exploitation

Metadata

Type	Esri Feature Service
Update Frequency	As required
Contact Details	Contact us via the Spatial Services Customer Hub
Relationship to Themes and Datasets	Elevation and Depth Theme of the Foundation Spatial Data Framework
Accuracy	Spatial Accuracy Horizontal: +/-1.25 @95% Confidence Interval Spatial Accuracy Vertical: +/-0.9 @95% Confidence Interval Calibration certification (Manufacturer/Cert. Company): DCS, Spatial Services.
Spatial Reference System (dataset)	Geocentric Datum of Australia 1994 (GDA94), Australian Height Datum (AHD)
Spatial Reference System    (web service)	EPSG 4326: WGS 84 Geographic 2D
WGS 84 Equivalent To	GDA94
Spatial Extent	Full State
Standards and Specifications	AS/NZS ISO 19115 - ANZLIC Metadata Profile Version 1.1 AS/NZS ISO 19131:2008 Geographic Information - Data product specifications OGC compliant Web Map Services (WMS) and Web Feature Services (WFS) Metadata for the relevant Spatial Services datasets complies with AS/NZS ISO 19115-2, ANZLIC Metadata Profile v1.1 and ISO 19139 Intergovernmental Committee on Surveying and Mapping (ICSM): Guidelines for Digital Elevation Data DCS Spatial Services: Elevation Data Products Specification and Description (LiDAR) DCS Spatial Services: Elevation Data Products Specification and Description (Airborne Photogrammetry)
Distributors	Service Delivery, DCS Spatial Services 346 Panorama Ave Bathurst NSW 2795
Dataset Producers and Contributors	Administrative Spatial Programs, DCS Spatial Services 346 Panorama Ave Bathurst NSW 2795

NSW Elevation and Depth Theme - 20M Historical Contours