Realigning the Christchurch Digital Cadastre after the Canterbury Earthquake Sequence
Scott King
The Digital Cadastre Parcel Dataset is produced and maintained by Land Information New Zealand (LINZ), the New Zealand Government agency that has responsibility for the cadastre and land title systems. This dataset is a fundamental base layer used extensively by surveyors and the wider geospatial community through both Landonline and the LINZ Data Service (LDS), which provides free online access to LINZ?s digital land and seabed data. This data is now made more readily available and users such as landowners and other spatial professionals expect the digital cadastre to accurately reflect the legal location of their boundaries. As part of the maintenance of the digital cadastre, LINZ periodically carries out Wide Area Cadastral Adjustments (WACAs) to realign data covering large geographical areas. The standard WACA process is used where new or improved geodetic control or a large amount of new cadastral data has been added to an area which can be used to generate a more consistent set of coordinates. The 2010-2016 Canterbury Earthquake Sequence (five earthquakes including the 14 February 2016 earthquake) had a significant impact on the digital cadastre and meant LINZ could not use the standard WACA process to realign the cadastre in areas affected by shallow land movement. As a result of the earthquakes, pre and post-earthquake data does not fit very well together in these areas of shallow ground movement. To realign the digital cadastre in Christchurch, LINZ developed an alternative WACA process with the aim of ensuring that the digital cadastre is as consistent as practicable with post-earthquake boundary locations.
Event: FIG Working Week 2016 : Recovery from Disaster
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