Geoscience Reference
In-Depth Information
Fig. 6
Conceptual schema of temporal position (NBN
2005
)
archaeological (excavation) objects. Therefore, their availability in a 4D data
model for archaeological data which ought to reuse (parts of) existing standards
and data models, is required.
For each of the six categories (Table
1
) the NBN EN ISO 19108:2005 standard
(NBN
2005
) is examined in order to assess its suitability. An appropriate standard-
conform description of each of these temporal paths is determined. For this pur-
pose, several assessments must be made. First, NBN EN ISO 19108:2005 (NBN
2005
) gives the choice between the geometric and the topological temporal rep-
resentation. Second, irrespective of the preceding choice, the decision between a
0D and 1D representation has to be made. Thus, the temporal value can be geo-
metrically represented by TM_Instant or TM_Period (Fig.
3
) or topologically by
TM_Node or TM_Edge (Fig.
4
). Finally, for the temporal categories with a geomet-
ric representation an appropriate temporal reference system to which the temporal
value is relatively measured has to be chosen (Fig.
6
). Although these six catego-
ries were defined by Katsianis et al. (
2008
) as properties of excavation objects, they
can be applied to the complete site as well. Consequently, the previously described
assessments will also be made for the temporal categories relating to the site.
