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OS OpenData Forum

Draw/Z Order in OS Open Roads

3XE
    • 10 April 2018 03:26PM
    • 225 Views
    • Visits: 2
    • Discussions: 1
    • Responses: 2
    • Registered: 18 November 2015 11:48AM
    • Last active: 10 April 2018 03:08PM

    Can a multi-layered collection of intersecting ways like Spaghetti Junction ( http://britishnationalgrid.uk/#SP092903 ) be rendered accurately in the Z dimension using only the data available in OS Open Roads?

    2 responses

    jafannon
      • 10 April 2018 03:51PM
      • 229 Views
      • Visits: 7
      • Discussions: 3
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      • Registered: 1 September 2016 10:20AM
      • Last active: 9 April 2018 01:08PM

      Hi Peter

      I'm pretty sure the answer is no, since OS Open Roads does not include grade separation or height information.

      OS Mastermap Highways Network does have grade separation and 3D geometry, but this is only available as a licensed product.

      Regards

      John

      3XE
        • 10 April 2018 04:34PM
        • 221 Views
        • Visits: 2
        • Discussions: 1
        • Responses: 2
        • Registered: 18 November 2015 11:48AM
        • Last active: 10 April 2018 03:08PM

        Thanks John. It's a shame because RoadStructureValue allows us to identify a tunnel or bridge (hypothetically) which leads to the cartographically confusing situation where a Z dimension appears to exist but then, perhaps unbeknownst to the viewer, doesn't in all places.

        OpenStreetMap's ways have a z order but unfortunately the X & Y do not align well to the Vector Map District and Open Local products. Looks like I may have to combine the two.

        --

        Edit: Just remembered OS Open Map Local Road feature class has draw orders 0, 1 and 2. Weirdly, whilst some interchanges do use all three, Spaghetti Junction seems to erroneously only
        have two levels.

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