Database Reference
In-Depth Information
Chapter 6
Flexible Querying of Imperfect
Temporal Metadata in Spatial
Data Infrastructures
Gloria Bordogna
CNR-IDPA, Italy
Francesco Bucci
CNR-IREA, Italy
Paola Carrara
CNR-IREA, Italy
Monica Pepe
CNR-IREA, Italy
Anna Rampini
CNR-IREA, Italy
ABSTRACT
Spatial Data Infrastructures (SDI) allow users connected to the Internet to share and access remote and
distributed heterogeneous geodata that are managed by their providers at their own Web sites. In SDIs,
available geodata can be found via standard discovery geo-services that makes available query facilities
of a metadata catalog. By expressing precise selection conditions on the values of the metadata collected
in the catalog, the user can discover interesting and relevant geodata and then access them by means
of the services of the SDI. An important dimension of geodata that often concerns such users' requests
is the temporal information that can have multiple semantics. Current practice to perform geodata
discovery in SDIs is inadequate for several reasons. First of all, with respect to the temporal character-
ization, available recommendations for metadata specification, for example, the INSPIRE Directive of
the European community do not consider the multiple semantics of the temporal metadata. To this aim,
Search WWH ::




Custom Search