How to Query Cadastral Big Data Using GeoSPARQL?


Wouter Beek (w.g.j.beek@vu.nl, wouter@triply.cc)

The Open Data Vision

Use (Geo)SPARQL endpoints i.o. copying data locally.

Properties of Cadastral Big Data

  • Over 1,000,000,000 graph edges
  • Over 100,000,000 geo shapes
  • Precision
  • Performance

Implementations of GeoSPARQL

GeoSPARQL: Executive summary

  1. Only few implementations to choose from.
  2. FOSS implementations do not perform.
  3. Commercial vendors cannot deliver an open endpoint.
  4. Commercial solutions do not work out-of-the-box.

“Nobody has complained about this before”

Questions to you

  • Should we drop the vision? (i.e., no open endpoints)
  • Is GeoSPARQL too demanding for the web?
  • Is there no market? (Open Government)
  • Can we --- commerce, FOSS, OGC, academia --- work something out here?