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National Road Centreline frequently asked questions

Background

  • What is the Road Centreline dataset?

    The road centreline dataset is an accurate, managed and maintained real world representation of the road centreline (the dotted line on the road). It contains tabular information from Road Controlling Authorities (RCAs) across New Zealand.

    The dataset contains:

    • Geometry of the real-world representation of the road centreline (the dotted line on the road) which is a fully connected, routable network.
    • Road asset attribute information for the majority of the 68 RCAs across New Zealand (currently 78 percent of RCA attribute information).
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Ownership

  • Who owns the road centreline dataset?

    The centreline dataset has a public/private ownership model.

    CoreLogic own the dataset geometry, and Road Controlling Authorities (e.g. local councils, NZ Transport Agency, DOC) own their individual attribute data like surface information for example.

    The Transport Agency owns the state highway attribute components of the dataset.

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Access

Data

  • How is the road centreline dataset different from the centrelines available on the LINZ data service?

    LINZ have two centrelines intended for TOPO50 mapping and Addressing. Though these datasets serve their purposes well, they were not designed to be used for accurate road asset management.

    The road centreline dataset, hosted on the NZ Transport Agency’s Open Data Portal is an accurate, maintained and managed dataset and a real-world representation of the road centreline (ie. The dotted-line on the road). This dataset contains the asset information for the majority of RCAs across New Zealand.

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  • How do CoreLogic collect and maintain the dataset?

    CoreLogic capture their road centrelines from a number of different sources. While the LINZ centreline is one of these sources, the centrelines are mainly derived from aerial imagery.

    When CoreLogic get new imagery, they will update centrelines in those areas to match the new imagery. For newly completed road projects/subdivisions, they will use survey plans to capture centrelines under construction.

    CoreLogic are also linked into local council updates and are able to ensure any disparity between their centreline and a councils is checked and updated accordingly.

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Uses

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