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+Data Model

Database refers to the database management system (DBMS) selected by the user. The descriptive data (attribute tables) and the geographical data (polygons, lines, points, texts, grids and images) will be stored in this database. The application TerraView  can connect to several databases simultaneously, but only one is active at a time. Notice that, a database can contain several information layers.

    Information Layer (PI)
Information Layer corresponds to the data layer that contains the geographical information (geometry and attributes). An information layer can be imported or created for the active database. Each information layer stores its correspondent cartographic projection parameters. To inspect an Information Layer it is necessary to use a view it belongs to in the database with a theme associated to the layer. An Information Layer can be used by different views (in different projections) associated to different themes.

Views are interactive maps that allow the visualization and analysis of geographical data. A view contains a set of themes and each theme is presented on the Graphic Display Area, taking into account the cartographic parameters defined for the view.

Themes are designed to display the contents of an associated information layer which belongs to the current database. A theme displays its contents with the cartographic projection of the view it belongs to. The same information layer can be displayed by different themes in the same view.

Related information:
TerraLib  Site
TerraLibTo obtain more information about the physical data model, click on: