Layers Tab

The maps consist of a number of layers A group of the same type of features that you can view on a map, such as parcels, water mains or street names. The data for each layer resides in a database table, where each individual feature of the layer is represented by a row, and the data connected with the feature (i.e. house number, APN, etc.) is stored in fields (columns) in the table., one for each group of features. For example the Parcels layer shows all the Parcels on the map. Each individual parcel is a feature A piece of information that can be displayed on the map such as a parcel number,fire hydrant, or aerial photograph. Each individual feature is represented by a row in a query table. (See "table") which has attributes A particular item of data about a feature, which you learn about in  Task 3: Getting Information about Features.

All layers that are available for your service A set of map data. are displayed on the Layers Tab to the right of the main window. Each service has a different set of layers, organized for the needs of the particular service.

Turning Layers on and off

When you turn on (activate) a layer A group of features that you can view on a map, such as parcels, water mains and street names., the corresponding features are usually displayed in the main window, depending on the Layer settings. Some layers appear only under certain Scale The map scale shows the magnification of the map, showing the relative size. The lower the number, the more detailed and "zoomed-in" level.

When you turn a layer off (deactivate), the features are hidden from view.

To activate or deactivate layers, click the check box next to the layer name. To activate or deactivate an entire group of layers, click the check box next to the group name. In the example, the following layers are activated: