Top-Down approach
Top-Down approach is used in case of small number of alternatives, with subsequent developing the value tree for the multicriteria problem under investigation. Spatial alternative here is considered as a set of features (cell, point, line or polygon) of the same or different types. So, spatial alternative has composite structure and may consists of different features from different map layers (eg. point-line-polygon, point-point, cell-line-point).

To create a new spatial alternative switch to the "Alternatives" tab (Main Window overview) and press "Add Alternative" button. In the opened dialog enter a new alternative name (eg: a1) and press "OK" button. An empty alternative will be added to the list. Note that empty alternatives may be used here to add to MCDA model alternatives which are not linked to map layers (eg: maps are used for visualization not for spatial alternatives development).
Spatial alternatives

To rename alternative select it on the list of available alternatives and press "Rename" button. In the opened dialog enter a new name and press "OK" button.

To delete an existing alternative select it in the list of available alternatives and press "Delete" button in the buttom panel.

To add features to an existing alternative follow steps below:
  1. Make layer active in the layer management panel (Main Window overview) by left clicking on it. Only features from the active layer may be added to spatial alternative.
  2. Select on the active map layer features (cells, points, lines, polygons) which make up a spatial alternative (use tools for searching and selecting described in section 2.4.2.1).
  3. Select alternative in the list of available alternatives and press "Add Site" button. A new site will be added to selected alternative. Site here is considered as a single set of features from one map layer. Alternative may have arbitrary number of sites.
To delete an existing site from alternative select it in the list and press "Delete" button in the right panel.

To view a selected site on the map press "Select" button on the right panel. Features which make up the site will be selected on the map (map layer have to be visible).

To select all comparable alternatives on the map press "Select Comparable" button. Alternatives are considered comparable if they have the same structure (eg: line-polygon). Non comparable alternatives will be ignored.