Geographic information system - Software Development Case Studies in Java

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In-Depth Information

Figure 15.6 An example of thematic database

of these five tables are shown in Figure 15.6 while an example of data in

table Routes is shown in Table 15.1.

Geographic features are linked to information extracted from a relational

database using the data linker tool. According to the requirements identified

in Section 15.3, it consists of a graphical user interface that provides the GIS

manager with the following functionalities:

Open the XML file that stores the geometric description of a cartographic

map.

■

Select the active layer (e.g. Archaeology) from a menu and one of the

feature types (sites, links, areas).

■

Select an active feature using the mouse.

■

Select the data origin (database name) from a menu and one of its tables.

■

Select a record of the chosen table and link its key value to the active

feature.

■

Record in an XML file the association between geographic features and

thematic information.

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Two additional requirements should be taken into account in order to

enhance the tool's usability:

Graphically distinguish geographic features associated with thematic

information from features still unbound.

■

Allow the iterative update of the cartographic map with new geographic

features and with new associations between features and thematic

information.

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15.5.2

Design

The essence of the data linker functionalities is to produce an XML file that

records the association between the geographic features described in the

cartographic map (i.e. in the XML file that stores it) and the thematic

Table 15.1 Data stored in table Routes

ID

Name