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Google Maps, satellite view

  • 12-12-2024 10:53pm
    #1
    Registered Users, Registered Users 2 Posts: 274 ✭✭


    In Google Maps satellite view in most places in Dublin, I can zoom in, spin the view around, get a 3D layer with topography, it's great. Outside Dublin, it's a flat as a pancake, cr4ppy 1D view, often covered in shadow which is no use. Why is that? Why is it crap in Dunboyne, but amazing in Clontarf for example?

    (the category is wrong, but the dropdown is not working on this site to select the correct category)



Best Answer

  • Registered Users, Registered Users 2 Posts: 2,197 ✭✭✭KrisW1001


    City mapping is based on LIDAR surveys. This done in a similar way to the StreetView photographic survey, but it measures 3d distance information. The result is what's called a "point cloud": millions of points in space, with their colour. With that data, a 3d model can be constructed of the centre of the city.

    models generated from LIDAR survey data takes up more storage space than the basic aerial photography, and it's much more expensive to gather, so it's only used for densely-populated areas.

    Outside cities, most contour information is from a global altitude survey carried out by NASA in the 1990s.



Answers

  • Registered Users, Registered Users 2 Posts: 9,401 ✭✭✭markpb


    At a guess, map data is expensive to gather so they only pay for it to be collected in higher quality in places where they see more people using it.



  • Registered Users, Registered Users 2 Posts: 19,139 ✭✭✭✭Del2005


    Google send people on foot with backpacks to map and record high traffic areas. For everything else you are relying on merged satellite and aircraft data



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