Map Layers group together map data items by their value in a designated field. The field is specified in the Map Data page, however the settings for each layer are specified here.
A layer defines a number of features for its members (depending on the map type):
Layers serve several purposes and so there are several options defining its use:
The Layers page shows a list of all layers. Drag and drop to set the sequence in which they are displayed in the legend list.
Click a layer to edit its details, or click “New Layer” to add a layer.
Each layer is defined by its value in the layer field. Note the special layer whose value is *. This acts as the fallback default for any layer value not added to the list of defined layers
Depending on the map type, the following settings are available.