NSW Coastline Water Theme: Mean High and Low Water Mark Lines

NSW coastline data is a linear feature class defining the line of contact between water and land. It delineates the Mean High Water Mark and Mean Low Water Mark for the state's territorial sea, excluding estuaries. The dataset is maintained by Spatial Services (DCS) and was last updated on 2026-04-08.

Use Cases

• Modeling coastal erosion and inundation based on the defined Mean High Water Mark line.
• Supporting emergency management response and recovery efforts based on the official coastline delineation.
• Informing environmental planning and monitoring based on the interface between land and the territorial sea.
• Contributing to the Australian Hydrological Geospatial Fabric for national water resource information systems.

Strengths

• Provides an official definition of the coastline for NSW as per the Seas and Submerged Lands Act of 1973.
• Includes two distinct linear feature types: Mean High Water Mark and Mean Low Water Mark.
• Maintained by Spatial Services (DCS) with continuous updates from relevant stakeholders.

Limitations

• The service is scheduled for retirement, requiring transition to a new GDA2020 service.
• The spatial reference (WGS 84 ≈ GDA94) may cause misalignments in GDA2020 environments.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Spatial Services (DCS)

Collection Method

Continuously updated with information sourced from relevant stakeholders.

Time Range

null

Freshness

Last updated 2026-04-08 14:03:52.060129; freshness should be verified.

Geography

New South Wales, Australia