MATLAB Basemap Data (R2017b)

作者 Jiro Doke, September 23, 2017

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Jiro‘s pick this week is MATLAB Basemap Data by MathWorks Mapping Team.

In the new R2017b release, there is a new interactive geographic function called geobubble which displays bubbles at geographic locations, with the size and color representing other parameters.

tsunamis = readtable('tsunamis.xlsx');
tsunamis.Cause = categorical(tsunamis.Cause);
gb = geobubble(tsunamis,'Latitude','Longitude', ...
    'SizeVariable','MaxHeight','ColorVariable','Cause')

gb = 
  GeographicBubbleChart with properties:

              Basemap: 'darkwater'
            MapLayout: 'normal'
          SourceTable: [162×20 table]
     LatitudeVariable: 'Latitude'
    LongitudeVariable: 'Longitude'
         SizeVariable: 'MaxHeight'
        ColorVariable: 'Cause'

  Use GET to show all properties

We can focus on a particular area, for example North America, with geolimits.

geolimits([10 65],[-180 -60])

The background image you see is the basemap. By default, the basemap you’re seeing here is called “darkwater” and is included with the product. You can change the Basemap property to five other maps: grayland, bluegreen, colorterrain, grayterrain, landcover. These maps are automatically accessed over the Internet. For those with no or low Internet connection, they can download an offline version of the maps.

grayland

gb.Basemap = 'grayland';
pause(2)

bluegreen

gb.Basemap = 'bluegreen';
pause(2)

colorterrain

gb.Basemap = 'colorterrain';
pause(2)

grayterrain

gb.Basemap = 'grayterrain';
pause(2)

landcover

gb.Basemap = 'landcover';
pause(2)

EDIT (to illustrate the exploratory nature of geobubble, as mentioned by Rob):

One of the use cases for geobubble is interactive exploration. For example, I can zoom in with my mouse to see a particular location in greater detail.