Creating Spatial Data Sources

 

Creating spatial data sources is done using a wizard. Simply follow the different steps until you reach the end of the wizard. Some user interfaces are common to all data sources and some are specific to each type of data source.

Basic concepts

Including multiple files

In most data sources that read files, multiple files can be integrated together to form continuous maps. It is frequent for CAD users to split the territory in rectangular tiles. By reading all tile files together, JMap administrators can recreate continuous maps. The only prerequisite is that the files contain the same data structure (geometry, layers and attribute types).

File browsing

For selecting files to include in data sources, JMap Admin provides a remote file browser that allows you to navigate the file system of the server where JMap Server is running. In order to select files, these must be located on disks accessible through the server file system and read permissions must be set accordingly.

When browsing the root of the file system, you have the option to create user-defined paths. These paths are shortcuts that can be useful to save time when browsing or can be used to write OS specific paths like Windows UNC (e.g. \\myserver\data).

JMap Admin remote file browser with user-defined paths

Creating a new data source

To create a new data source, press the Create button in the Spatial Data Sources list section.

 

 

Note that custom data source types may exist. They are new types of data sources that are developed using JMap SDK for special needs.

The next steps will depend on the data source type you selected. For more information on data source-specific configuration interfaces, refer to the appropriate section by clicking on the links in the following table.

 

 

Attributes

This step applies only to vector data sources.

After the data source-specific configuration section, you need to configure attributes for the data source. All available attributes are listed in a table. By default, all attributes are included but some attributes can be excluded, in which case they will be completely ignored by JMap Server. It is also possible to specify for which attributes JMap Server should create an index for better query response times (this does not affect the map download and display times). These indexes are used when performing attribute queries on these fields. Also, it is possible to look at a sample of the attribute values (10 first values) by clicking on the attribute names.

This section also contains settings to configure external attributes. See External Attributes for more details.

 

Projections        

The projection of the data source must be selected to match the projection of the data. If this is not set correctly, the data display may be invalid. For more information about projection support in JMap, refer to the Geographic Projections section.