Data sources can be of several types. Some data sources
provide only a simple map backdrop, while others can provide details
down to street level, describe water facilities, transport facilities,
and so on. Normally, one data source is equivalent to one map data
file or one database query. However, when reading multiresolution
maps such as CADRG, there is one data source per resolution.
Note that CADRG data is available on the maps data DVD
supplied with the installers for JViews Maps
The Data Sources pane (if this tab is not visible see
Additional views) provides
a list of all the data sources currently imported into the Map Builder and their corresponding properties. Typically the
properties define the coordinate system applied to the data source
and the name of the file in which the data is held. The complete set
of properties in the list depends on the type of data source selected.
You can select a data source in the list, change its
properties at any time, or remove it from the list.
The following figure shows an example of the Data Sources
pane.