Map View
The map view presents data items that can be geographically located. Each map view has a projection, indicating a coordinate system. For instance in Dutch applications usually the "Rijks Driehoek (RD)" coordinate system is used. EPSG codes are used as identifiers for the most common coordinate systems. The EPSG code is shown in the title of each Map View, if configured as SpatialReference property for the base unit of the coordinate system.
A map view consists of layers, each layer is related to one or more data items. All geographically related data items using the same projection can be combined in the same map view window. They can also be opened in multiple separate map views. The number of opened map views is not limited. In the example of Figure 6.1 a map view is presented with three layers:
- Two reference layers with province boundaries and with a top100 grid.
- A dominant land use thematic grid layer. In paragraph 7.2 the available layer types for a GeoDMS map view are described. A map view can be activated from the Treeview by selecting tree items that can be geographically related. These items are indicated with a map icon ( ). A new map can be created or a layer can be added to an existing map by selecting a tree item and activating one of the following actions listed in the table. The result of the action, based upon whether there is already an active map view opened, is described. Action No active map view Active map view Double click on selected tree item New map window Layer opened in active map view with same coordinate system Enter key on selected tree item New map window Layer opened in active map view with same coordinate system Main/pop-up menu option Default View New map window Layer opened in active map view with same coordinate system Main/pop-up menu option Map View New map window New map window Ctrl-M on selected tree item New map window New map window Drag and drop to view area/active window New map window Layer opened in active map view with same coordinate system A reference grid layer can be configured as a background layer. This means in all map views this layer is visualized automatically when the view is created (see the modeler’s guide for how to configure a default layer)
