Geoscience Reference
In-Depth Information
Table 2
Similarity between geometric and topological primitives in ISO 19107 (2003) and NBN
EN ISO 19108:2005 (2005)
Spatial
Temporal
Geometric
Topological
Geometric
Topological
0D
Point
Node
Instant
Node
ID
Curve
Edge
Period
Edge
2D
Surface
Face
-
-
Fig. 3
Temporal geometric primitives (NBN
2005
)
geometric and topological temporal schemas is analogous to these of the spatial
schemas described in ISO 19107 (
2003
). In the remainder of this paragraph, the
similarity with the latter will be emphasized and is summarized in Table
2
.
The ISO standard describes two geometric primitives, analogous to spatial
primitives, who provide information on the position in time measured on an inter-
val scale: TM_Instant and TM_Period (Fig.
3
). As a point in space, an instant rep-
resents a zero-dimensional geometric primitive in time (NBN
2005
). The point
that is represented by the instant is specified by the attribute position, which is
related to a specific temporal reference system (NBN
2005
). A 1D geometric
temporal primitive is represented by a period, which begin and end position are
identified by TM_Instants (NBN
2005
) (Fig.
3
). ISO 19108 (NBN
2005
) pro-
vides an interface TM_Order to determine the relative position of two geomet-
ric primitives according to the Allen relations (
1983
). The relation between two
