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10m Historical Contours are virtual lines joining points of equal elevation relative to the Australian Height Datum. The contours were digitized from aerial photography and ortho image traces between 2003 and 2017, with original feature reliability dates ranging from 1971 to 2008. This dataset is part of the NSW Elevation and Depth Theme, managed by Spatial Services, a business unit of the Department of Customer Service NSW.
Users in GDA2020 environments should note potential misalignments; a 'multiCRS' service variant is available for multi-coordinate reference system support.