Commercial data products

Critchlow Limited (Critchlow) is the provider of a data product named NationalMap. NationalMap is a nationwide New Zealand vector dataset of locations for a broad range of both natural and cultural features. The core data product contains add-on products including routing and road assessment and maintenance management (RAMM) data. Critchlow is New Zealand’s sole distributor for MapInfo products and the routing data included in the NationalMap product is optimised for routing within MapInfo. At the time this research reviewed the NationalMap data, NationalMap2 was the most current version. Critchlow have since released NationalMap3. NationalMap2 included the following data:

·         Road centreline polyline layer: this includes attributes for the street name, identification, legal status, surface type, hierarchy, speed limit, average speed and one-way direction references.

·         Bridges point layer: this includes attributes for the bridge names, bridge identification, road identification, road name and features under and over the bridge.

·         Traffic lights point layer: this includes attributes for type, as well as traffic and pedestrian-related information.

·         Turn restrictions point layer: this includes attributes for road identification, secondary road identification, road name, secondary road name and restriction type.

Roading networks for routing applications from RWNET (described in section 10.4), are built based on routing data mentioned earlier. The application uses the road network and incorporates features such as traffic lights and turn restrictions into the data for routing. Features need to be entered in the correct location in order for points associated with the corresponding road network intersections to be accessed.

RAMM data provided by Critchlow is submitted by local councils and furnished by Critchlow for on-sale to others. CJN Technologies Limited specialises in the development of software for the New Zealand roading industry including the development of RAMM. RAMM data supplied by Critchlow includes attributes such as road name, road identification, traffic counts, length and width of road, pavement type, urban/rural classification and the number of lanes.

Other data relevant to accessibility is provided mostly as point data in NationalMap2. A summary of data relevant to accessibility assessments in included in table 10.2.

The other provider of nationwide spatial data in New Zealand is Terralink. Terralink does not distribute GIS software products although due to market demand, its outputs are primarily in ESRI format. The Terralink dataset provided to the researchers as part of this project was substantially more detailed and contained more datasets than the NationalMap2 product.

Terralink distributes LINZ CRS data. This dataset is the official dataset for maintaining core land records in New Zealand. The CRS system also includes point data for address matching, which is a significant dataset to supply given the production of such a dataset can be technically challenging. CRS data relevant to accessibility assessment includes address data, rail and road centrelines and land parcels.

Terralink also maintains a point of interest database. A summary of the points of interest that are relevant to neighbourhood accessibility is included in table 10.2. The point of interest database also contains relevant information about the particular feature. For example, each automated teller machine (ATM) that is geocoded contains information about the bank the ATM operates for, and parking data includes opening hours and standard parking rates.

Terralink supplied data also includes selected land use files. These layers are not as detailed as those supplied by local councils given the level of detail included in district plans.

Terralink also supplies a roading network that has been prepared for use with ESRI’s Network Analyst extension. This is supplied ready for analysis and includes routing information such as turn restrictions, intersections, one-way attributes, road hierarchy, speed limits, surface type, legal status, number of lanes, travel time based on speed limit and turning attributes.

Table 10.2    Commercial data sources

Data

Critchlow Limited

Terralink

Road centreline

Yes, RAMM

CRS road

Road surface

RAMM

Road network

Seal width

RAMM

No

One way

RAMM

Road network

Turn restrictions

Point data

Road network

Speed limit

RAMM

Road network

Journey speed

Derived from speed limit, RAMM

Derived from speed limit, road network

Traffic volume

RAMM

No

Traffic lights

Point data

No

Traffic lanes

RAMM

Road network

Compiled network

No

Yes

Road length

RAMM

Yes

Road travel time

No

Road network

Rail data

Yes

Yes

Address data

No

Yes

Land use

Partial

Partial

Land activity

No

No

Health services

Yes, although no local medical centres

Medical centre and hospitals

Education facilities

Schools and other

Schools and tertiary institutions

Post offices

No

Yes

Banks

No

No

ATMs

No

Yes

Churches

No

Yes, not detailed

Information centres

No

Yes

Parking lots

No

Yes, with costs

Petrol stations

No

Yes

Retail locations

Broad polygons

Shopping centres

Public recreation space

Yes, not detailed

Golf courses, camp grounds

Bus terminals

No

Yes

Post code regions

Yes

No

Suburb outlines

‘Community of interest’, low resolution

Yes

Note: ‘land use’ relates to the general use of the land, eg business or retail, whereas ‘land activity’ is more specific, eg post offices.