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Working with layers and map contents

A mapping application uses one or more content sources. Each content item corresponds to a web service. Each source contains one or more map layers. A map layer is a type of data shown on the map, such as roads, cities or a satellite image. You can view the list of the contents of the map, turn on and off layers, and examine the symbols for layers.

To examine the map contents:

• Display the Map Contents item, if necessary, by clicking the down arrow for Contents .
• When Map Contents opens, only the top-level content items may be visible.
  
• Click the plus button next to a content item to display the layers within it.
• A check-box next to the layer indicates whether the layer is currently turned on (i.e. being shown).
• You can click the check-box next to the layer name to turn the layer on or off. The map automatically redraws to reflect the changes in layer visibility.
• Some layers may not be visible at the current map scale (zoom level). These layers are called scale dependent. You may need to zoom in or out to see a particular layer displayed if its check-box is checked but disabled.
• If the scale dependent check-box is shown at all zoom levels, then that layer (i.e. contours and soils) is listed below as a separate service. Scroll down to turn on or off the desired web service in order to show or hide that layer.
• If layers have a plus button next to the name, you can expand the layer to display a legend for the layer. The legend may display a single symbol or multiple symbols for the layer.