An Open and Powerful GIS data discovery engine #OGRS2012 26th - - PowerPoint PPT Presentation

MARTIN OUELLET (GIS ANALYST/DEVELOPER) STÉFANO BIONDO (GIS LIBRARIAN)

An Open and Powerful GIS data discovery engine

#OGRS2012 26th October 2012

BIBLIOTHÈQUE DE L'UNIVERSITÉ LAVAL

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Roadmap/Agenda

Who are we? Our situation Demo Under the hood Conclusion

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What is this strange accent?

Centre GéoStat

Books, statistics, maps, atlas, geospatial data 30 000 geospatial datasets (over 10 To) Teachers, students and researchers across the campus

= Laval University Library service

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Goal: Facilitate the discovery and the access for education and research

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What Big Data mean for us?

Dataset obtainable for very low cost Crawling under Tons of hard drive Exhausted GIS librarian

THE ECONOMIST. The data deluge. February 2010.

Disciplinary Formats

(download stat. between 2002-2010)

Datasets

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The Old Stuff (2005 - today)

Delivering data in 2 formats only Aging technology (ArcIMS) No search engine No preview mode No basemap

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The new platform

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Under the hood

• 1. Semantic « Auto Complete »

Using a thesaurus to benefit from the semantic network ( ) Using fast indexing technology( )

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Using a thesaurus

R i v i è r e s Cours d’eau

Répertoire de Vedettes-Matière 273 000 subjects Semantic network Local thesaurus

… <title>Hydrographie (linéaire)</title> <abstract>L'hydrographie est une délimitation des eaux...</abstract> <keywords> <keyword>cours d’eau</keyword> <keyword>…</keyword> </keywords> …

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Client

Edition

Catalog

Save

BD

Search

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RVM

ex: cours d’eau, rivers, potamologie cours d’eau

Bonified search process

Metadata

Profil N-A Profil ULaval ISO19115 / 19139 (XML)

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BoundingBox Multipolygon

• 2. Accurate spatial filter

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• 2. Accurate spatial filter

Multipolygon BoundingBox

ConvexHull

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ConcaveHull Point Line Polygon Version >= 1.5

(ST_ConvexHull)

Version >= 2.0

(ST_ConcaveHull)

<GML />

XML Encoding

<gmd:geographicElement> <gmd:EX_GeographicBoundingBox> <gmd:westBoundLongitude>-79.750006</gmd:westBoundLongitude> <gmd:eastBoundLongitude>-56.999994</gmd:eastBoundLongitude> <gmd:southBoundLatitude> 44.874996</gmd:southBoundLatitude> <gmd:northBoundLatitude> 52.250003</gmd:northBoundLatitude> </gmd:EX_GeographicBoundingBox> </gmd:geographicElement>

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<gmd:geographicElement> <gmd:EX_BoundingPolygon> </gmd:EX_BoundingPolygon> </gmd:geographicElement>

<GML />

Stay ISO19115/39 compliant

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• 3. Using facets to drill down fast

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Lessons Learned To conclude focus more on discovering than viewing metadata is crucial the user should find data in 3 actions (by entering text in the search box or by filtering (map or facet) or less

Thank you!

Martin.Ouellet@bibl.ulaval.ca Stefano.Biondo@bibl.ulaval.ca

geoindex-plus.bibl.ulaval.ca

Questions ?