To properly define the geographic scope of a context and ensure a visual representation, it must have several mandatory features that need to be manually defined or imported by the user.
Figure below summarises these geographic features and their respective multiplicity constraints, including domain, refinement, alignment, boundary line, boundary point, DTM (digital terrain model), and mesh.
The definition of the features represents the visual aspect of a context. While the DTM also has a visual representation within the context, it is not a geometry but a raster, and therefore cannot be defined by the user. Instead, it must be uploaded as a raster file format. The structure of these geometries is similar since they follow the same design principles: they are all geometries that the user can define by simply drawing on the map. However, the definition of these geometries is subject to two geographic constraints: (i) the domain geometry must contain all the other geometries inside its boundaries, and (ii) the bounda-ries of these geometries cannot intersect each other under any circumstance. Each feature is further described in the following paragraphs.
Geographic Features: Refinement
Geographic Features: Alignment
Geographic Features: BoundaryLine