Definition of Scale Rank & appropriate attribute for size-based styling

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  • #3691

    jeffme
    Participant

    Is there a link to a formal definition of Scale Rank?

    (I’m guessing it doesn’t really have to do with the “Scale” or size of a country?)

     

    What I’m trying to do:

    – Some physically-sized based styling

    – Trying to mimic what Google Maps does for shading / bordering of countries

    — go to maps.google.com and search for Sweden, set zoom to 0 – see the red fill highlight

    — set zoom to 2 – see the red border highlight replace the fill highlight

    — do the same for Ghana

    — see that the fill isn’t replaced by the border until zoom=4

     

    Am I missing an attribute that could be used for this?

     

    Thanks!

    Jeff

     

    #4421

    Nathaniel
    Keymaster

    They largely follow the Google zooms you are describing, with one notable exception:

    Natural Earth scale rank 4 is roughly 1:50,000,000 scale (NEW, only in Natural Earth). And then it picks back up normally with scale rank 5 is 1:36,000,000, etc.

    http://kelsocartography.com/blog/?p=2407

    Nothing is perfect, but this mostly works between all themes.

    This is because while the 2^x power schema is useful, it doesn’t hold up well at that one particular scale, a typical scale used in much small and medium scale maps.

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