Photos: Unfolding OpenStreetMap

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  • openstreetmap-1.jpg

    Contributors to OpenStreetMap walk, cycle or drive around an area, recording their position at regular intervals using a GPS receiver. This creates a set of breadcrumb trails that show the position of streets.

    Caption by: Jonathan Bennett

  • openstreetmap-2.jpg

    Once GPS data has been gathered, it can be traced using JOSM, the offline editor for OpenStreetMap. "Nodes" and "segments" define the physical layout of roads, rivers and other features.

    Caption by: Jonathan Bennett

  • openstreetmap-3.jpg

    Street names, routing information and other data is overlaid on the physical layout using "ways". Each segment can belong to more than one way, so that the topology can be reused as much as possible.

    Caption by: Jonathan Bennett

  • openstreetmap-4.jpg

    Once the topology is defined and tags added to define street types and other features, it can be rendered into a map.

    Caption by: Jonathan Bennett

  • openstreetmap-5.jpg

    Freemap combines OpenStreetMap data with contours from a Nasa project and photos from Geograph to create an annotated map aimed at walkers. The Creative Commons licence used by OpenStreetMap allows this kind of reuse of its data.

    Caption by: Jonathan Bennett

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Images taken from the open-source application illustrate how information is collated to create a detailed map of an area

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Contributors to OpenStreetMap walk, cycle or drive around an area, recording their position at regular intervals using a GPS receiver. This creates a set of breadcrumb trails that show the position of streets.

Caption by: Jonathan Bennett

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