UNIFIED MODEL OF GEOINFORMATION SYSTEMS
Unified model provides basis for implementation of Ginis framework, while GADL is defined in
terms of a model. The model is qualified as "unified" because it is used for all application components
of an overall WebGIS. The idea behind is that a desktop GIS application, WMS, WFS and a portal
Web application are just different interfaces to unique set of data and operations. The model is
strongly influenced by the OGC reference model (OGC Reference Model, 2003) slightly modified by
separating layers with geographic features that can be queried via WFS and encoded in the GML2
(Geography Markup Language, 2002), from layers with a coverage that can be only displayed. UML
class diagram for the model is shown on figure 3.