Map themes and map data can be saved separately. For more information see:

Map Theme Only

A theme has basically to do with the look and feel of the map and provides you with full control over how map data is displayed. A map theme allows you to decide what is displayed, when, and how.

You can save the map with data, or save it as a theme only containing references to the raw map data. If a map is saved in this way, the application must have access to the map data sources. The following prepared map data is saved:

A use case for this implementation could be as an application used to monitor traffic in a Web portal. The application developed using JViews Maps would load the latest traffic and street information at launch time, from external Map Servers.

Map Theme and Map Data

The contents of such a map file are the same as for a map theme only, but instead of storing map data as a set of URLs or pointers, the data is copied locally. This provides a faster loading time, especially for raster data, and allows a map to be displayed even if the original "source data" is not accessible anymore.

However, some operations on the map such as a change in coordinate system might need this source data to ensure proper reprojection without loss of precision. If source data is not available, embedded map elements are reprojected without reading them back from the original data source.

A use case for this implementation could be if the application developed using JViews Maps is used to monitor the position of firemen in a building. The firemen would probably have poor or no connectivity to a server, so would need map data locally. Any available bandwidth could be used to update the position of the individual firemen in the building during an intervention.