Spatial cadastre positional accuracy map

This map of Queensland depicts the current positional accuracy of the Queensland digital cadastre (previously known as the DCDB).

Background: The digital cadastre was developed by manually digitising the best available cadastral maps at the time. In 1992 the digital capture was completed to the agreed standard.

The positional accuracy of the digital cadastre was derived from the source map scale and the precision of the digitising. Consequently, this positional accuracy initially varied throughout Queensland from +/-1 metre to +/-250 metres.

Because the data is used in all of the state's land information systems, a continuing program continues to upgrade its positional accuracy. As a result, there has been a gradual improvement, to the extent that the worst positional accuracy in Queensland is currently ±63 metres. These areas have been identified and prioritised for an upgrade.

Positional accuracy values have been allocated to all parcels in the digital cadastre. This value reflects 'maximum error' status of the polygons and has been derived from the capture process or assigned as the data has been upgraded. For this extraction, the 'maximum error' of parcels, expressed as a value, ranges from and a data-sourced statement. It has been established that the positional accuracy of the data should include a finite value representing the 'maximum error' based on the source map type, the scale and a digitising value component. Positional accuracy values are expressed in metres at a 95% confidence level.

More information about this process can be found here: Link