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I would like to add some markers on some cities on a map (smaller or bigger depending on the values each city has)

vals={GeoVariant[Entity["Country", "Spain"], "SimplifiedArea"] -> 11.1268, 
         GeoVariant[Entity["Country", "China"], "SimplifiedArea"] -> 10.7984, 
         GeoVariant[Entity["Country", "UnitedStates"], "SimplifiedArea"] -> 
          10.5992}
GeoRegionValuePlot[vals, GeoRange -> {{-60, 90}, {-170, 190}}]

This gives the plotenter image description here

I would like to add now a Disk with radius 3 on New York, a disk with radius 2 on Madrid and a disk with radius 5 on Bejin. Anyone can help me? Thanks

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Combine plots using Show.If you search docs you can easily find many examples. Note I used GeoDisk just to show you it exists. But you could also use Disk and Epilog for example. Or GeoGraphics instead of GeoListPlot etc. - there are many ways. Also consider GeoBubbleChart.

vals={
    GeoVariant[Entity["Country","Spain"],"SimplifiedArea"]->11.1268,
    GeoVariant[Entity["Country","China"],"SimplifiedArea"]->10.7984,
    GeoVariant[Entity["Country","UnitedStates"],"SimplifiedArea"]->10.5992};

cit = {
    GeoDisk[Entity["City", {"NewYork", "NewYork", "UnitedStates"}], 
    Quantity[300, "Kilometers"]], 
    GeoDisk[Entity["City", {"Madrid", "Madrid", "Spain"}], 
    Quantity[200, "Kilometers"]], 
    GeoDisk[Entity["City", {"Beijing", "Beijing", "China"}], 
    Quantity[500, "Kilometers"]]};

pl1=GeoRegionValuePlot[vals,GeoRange->{{-60,90},{-170,190}}];
pl2=GeoListPlot[cit,GeoRange->{{-60,90},{-170,190}}];
Show[pl1, pl2]

enter image description here

Here example without Show just with Epilog and regular Disk for just NYC:

GeoRegionValuePlot[vals, GeoRange -> {{-60, 90}, {-170, 190}}, 
    Epilog -> {Red, Opacity[0.5], Disk[Reverse[First[GeoPosition[
    Entity["City", {"NewYork", "NewYork", "UnitedStates"}]]]], 10]}]

enter image description here

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  • $\begingroup$ Thank you very much. have a nice day $\endgroup$ – Giorgio Colangelo Mar 16 '17 at 14:01
  • $\begingroup$ one think. The circle in the second method looks in a different perspective if I use different earth projections, i.e. , GeoProjection -> "WinkelTripel". do you know how to avoid this problem? thanks $\endgroup$ – Giorgio Colangelo Mar 16 '17 at 14:15
  • 1
    $\begingroup$ @GiorgioColangelo but this is why I told you about GeoDisk? $\endgroup$ – Vitaliy Kaurov Mar 16 '17 at 15:45

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