Map contents

Working with layers and map contents

This mapping application uses content sources called services. Each service contains one or more map layers. A map layer is a type of data shown on the map, such as roads, towns, or aerial imagery.

This mapping application allows you to 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

• In the Console, display the Map Contents by clicking the Map Tab. Click on the Contents title bar to show/hide the Contents.
• When Map Contents opens, the data category groups will be visible. Turn an entire data group on or off by clicking the checkbox beside the name. If a box is checked, that data group is turned on.
• Click the plus button next to a data group to display the layers within it. A checkbox next to the layer indicates whether the layer is currently turned on.

  

• Click the checkbox 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 the map in or out to see a particular layer displayed, even if its checkbox is checked to draw.
• Under the list of layers there is a tool to change the transparency of any of the data groups allowing you to view other layer groups beneath it.
• Click in the Change Transparency dropdown box and select the data group you want to adjust.
• Slide the transparency bar to the left to make the layer group more transparent. Slide the bar all the way to the right to remove all transparency on the layer group.

To view the Map Legend

• Click on the Legend title bar in the Map tab to show/hide the Legend box.
• Click a layer group name to show/hide the legend for that group.
• Click the Open legend as PDF links to view or print PDF versions of the legend.

Map Scales

The map scale shown in the Map Screen is given in an absolute ratio of independent units. This means one unit on the map is equal to the corresponding number of the same units on the ground. For example, a scale of 1:32000 means that 1 inch = 32,000 inches or 1 foot = 32,000 feet depending on the unit used.

The following table provides a list of all of the map scales in the mapping application and their inch to feet equivalent for mapping purposes.

Not all layers are visble at all scales. The following table provides a list of the data layers in the mapping application and their visible scales.