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Christchurch / Canterbury Address Points (Feb 2011)

Ollivier & Co
  • Added 28 Feb 2011
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Donated by Ollivier & Co for Christchurch post-earthquake efforts.

LINZ maintains a point layer of primary address points allocated by local councils for rateable properties. The principle purpose of this dataset is to allocate voters to the correct electorate. The set is actively maintained, but is still incomplete and some locations are incorrect. Nevertheless it is by far the most comprehensive address database available.

It includes all rural address points (RAPID numbers), commercial addresses and many flat numbers. So numbers are not numeric, there are all sorts of formats included here, sorry. Addresses are not unique. The points are "location addresses", not "postal addresses". For residential town addresses this is normally the same, but for commercial and rural locations they are not the same.

Primary addresses are only the number and alpha parts. Not included is a flat, unit, apartment, floor or other subdivision of the main property address. They should also not be a range, simply the entrance to the property.

Address points only have a number and a key to a road centreline segment. They did not contain a full address or postcode as you see here.

Road names in the address are joined from the road centreline segments, in turn derived from the ASP (Authoritative Streets and Places) database (downloadable from the LINZ site). All road names in this database are official, with a locality (suburb or town) allocated to make the complete address unique within a local council district. There are no postcodes in the ASP of course. Unfortunately there is only one entry linked per road name, which is not always correct for long roads, where the road is a suburb boundary or a road is cut by a TLA boundary. Road names are unique if you include the location and local authority name as part of the name. The postcode alone does not make an address unique because they cover too large an area and NZPost use a different surburb/mailtown/postcode composite key.

These addresses are a "situation" or "location" address, not a "delivery address" or "property identifier". It does not have complete flat or unit numbers, although there are some due to confusion in the purpose of the database, so you will see some.

NZ Post uses this dataset to maintain their GeoPAF file which is a subset of this data because they only supply 'post' addresses where they deliver mail. Therefore no commercial or rural addresses are included in the PAF (PO Boxes are the postal address for these properties). The postcode has been added from an original postcode map, not from the PAF. It is not part of the LINZ or ASP. Postcodes are for bulk mail sorting, not for defining a unique location address. (NZPost will supplement the PAF with all address points for a significant fee.)

Note that an address number is related to the road centreline. No road - no address. It is a linear referencing system, starting at one end, continuing in sequence to the end of the road with odd numbers on one side and even numbers on the other. In towns the spacing is approximately 20 metres, and in the country it is 200 metres.

Addresses are NOT related to parcels and should not be a property key because they are not unique, consider a corner section. They do not define property boundaries. Think of addresses as the location of the letterbox marking the entrance to the property, not the building. The mapped point is generally located 15 metres from the centreline at the entrance or at the neck of a rear section. Address ranges on a point are deprecated in the NZ address standard, a single number should be allocated to the principle entrance so the fire service can find it quickly and unambiguously.

This is different from base address ranges with parity and direction on a road centreline which would be really useful and are common overseas but do not exist for NZ. Even private sets are not done properly. A base address is a simple integer with a range of 1 - 9999.

See [Where The Hell Are You?] ( www.ollivier.co.nz/publication/GITA2005/ollivier_a...) for more explanation on the confusion between an address and a property and the NZ Address Standard AS/NZS 4819:2003.

Source LINZ Bulk Data Extract February 2011, ASP, Postcodes Nov 2006

License

Creative Commons Attribution 3.0 New Zealand

You may use this work for commercial purposes.

You must attribute the creator in your own works.

Information

CategoryCadastral & Property
RegionsWaimakariri District, Selwyn District, Christchurch City
MetadataISO 19115/19139, Dublin Core, FGDC CSDGM

Technical Details

Layer ID 3162
Data type Vector point
Feature count 179502
Attributes OBJECTID, SAD_ID, HOUSE_NUMB, STATUS, RCL_ID, RNA_ID, POSTCODE, FULLADD, TYPE, NAME, LOCALITY, OTHER_NAME, TLA
Services Vector Query API

History

Added28 Feb 2011
Revisions 1 - Browse all revisions
Current revision Imported on Feb. 27, 2011 from Shapefile in NZGD2000 / New Zealand Transverse Mercator 2000.
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