Adding Bubbles to a Map.
Overview
In order to show statistical information about map regions you can use region coloring , color thresholds or proportional Bubbles. Proportional Bubbles on the map is the same type of the chart as Bubble chart or Scatter Bubble chart, but the bubbles are placed on the map plot and can be bound to the map regions (or placed to the map using latitude and longitude coordinates).
All bubbles configuration can be accomplished in the way described in Bubble Chart Tutorial.
Creating Bubble Chart and Binding Bubbles to Regions
To add proportional bubbles to a map you just need to add <series> of a Bubble type to <data> section:
01 |
<series type="Bubble" color="LightSteelBlue"> |
02 |
<point name="Iowa" link="Iowa" size="63.1" /> |
03 |
</series> |
link attribute defines to which region on the map this bubble is bound, the value of the link attribute should be one of the values from id_column (read more about identifying regions).
Note: at first sight this map seems not usable - large bubbles overlap each other andit hard to compare some regions, but you can see a zoom control on the left - it allows you to take a closer look at country regions and compare east coast (for example) states to each other. Launch the live sample and do that yourself.
