Land Information New Zealand (LINZ) is updating geodata for the South Island of the country after eight earthquakes in Christchurch and Fiordland since 2000. Here's the message from LINZ:
The update will only affect Property and Ownership, Electoral, and Geodetic layers data. Topo and hydro datasets will not be affected by this change due to the magnitude of the changes (in most cases less than 0.5m) and the lower horizontal accuracy of the topo and hydro datasets.
All spatial features which have moved more than 0.05 metres will be updated, and this means that almost 70% of the South Island parcels will change to some degree. You can view the magnitude of the coordinate shifts on the LINZ Data Service:
For more information about the update, visit the Landonline website.
What you’ll see in the LINZ Data Service
If you use any of the LDS Property and Ownership, Electoral, or Geodetic layers data within the South Island region then this update is likely to affect you. The datasets with the greatest number of updates are:
What you need to do
If you don’t use any of the LDS Property and Ownership, Electoral or Geodetic datasets, then you don’t need to do anything.
If you have a copy of any of the effected datasets on your computer or stored on a local database, you may want to get the latest version available from 10 December. You can simply download a new copy of the data to replace your existing one.
If you make use of our web services to maintain data in your own systems, you can use our changeset service. This enables you to update your local copy of our data by accessing the changed data only, rather than refreshing the whole dataset. While standard maintenance of your local databases will include spatial updates, the scale of this update may mean you need to take particular care to confirm your processes have run and completed correctly.
Support for shifting external datasets
LINZ is working on a transformation grid model to help you move any external datasets that have a spatial relationship with our updated Property and Ownership, Electoral, and Geodetic layers data. This grid model will be available from the LINZ website as an ASCII format and NTv2 format grid file. We will contact you once this grid model is available.