Splitting or Filtering Map Layers
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| Using the Map Builder > Getting to Know the Map Builder > Maps > Splitting or Filtering Map Layers |
Splitting or Filtering Map Layers |
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This feature allows you to split or filter a map background layer according to the component properties contained within it. Splitting results in two or more filtered layers, whereas filtering produces only a single filtered layer. For example, you could split a layer to create two filtered layers that group together countries with a population above and below a given size, or create a single filtered layer that groups together all countries by name or by continent.
The list of properties displayed depends entirely on the meta data contained in the map layer you have selected and may be different for different layers. You can also split or filter a map layer more than once or you can split or filter an already filtered map layer again. In the case of splitting, an additional option allows you to create a second filtered layer for objects that do not match the filter.
Each time you split a layer into one or more filtered layers, they are automatically added to the Map Layers pane and marked (Filtered).
When you open the Map Builder, the map layer ESRI/Shape (data/World_Countries.shp) is displayed by default. You can split this map layer, for example, to show the countries in the world that have a population equal to or more than, or less than 10,000,000 people. To do this, you must select the option that creates another filtered layer that groups together the world countries that do not have a population equal to the value you set (see Splitting or Filtering a Map Layer). By making the split layers active or inactive, you can display your map in a way that highlights the specific objects you want to filter. Figure 2.9, which for the purpose of this example is centered on Africa, shows countries with a population equal to or more than 10,000,000.
You can now switch the active and inactive states of the split layers to show the countries that have a population of less than 10,000,000, see Figure 2.10.
In this example (centered on Africa) the Map Layer has been filtered to group together the countries of the world, see Figure 2.11.
For more information, see Splitting or Filtering a Map Layer.
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