canada centre for remote sensing - ess ontology work @ geoconnections cgdi & ccrs nrcan brian...

Canada Centre for Remote Sensing - ESSOntology Work @ GeoConnections’ Ontology Work @ GeoConnections’ CGDICGDI& CCRS’ NRCan& CCRS’ NRCan

Brian [email protected] Centre for Remote

Sensing

Canada Centre for Remote Sensing - ESS

Intelec Geomatics Inc. (Montreal, Quebec)

GeoInnovations (technology development program)


• Semantic interoperability background• Ontology Service Project

– Context– Introduction– Objectives– Methodology

• Architecture• Software• Demonstration• Next Steps

OverviewOverview


Introduction [Brodeur] Introduction [Brodeur] •Multiplication of geospatial data sources and increased

usage of geospatial information technologies– NTDB, VMap, DCF, BDTQ, OBM, Geographic Data BC;

•Geospatial data and services are more and more accessible on the Web

– Canadian Geospatial Data Infrastructure (CGDI), NSDI;

•Today, users are turned to various geospatial data sources to fulfill their needs;

•Interoperability of geospatial data and geoprocessing, proposed at the beginning of the nineties, constitutes a solution for the sharing, re-use, and integration of geospatial data (McKee and Buehler 1998; Sondheim, Gardels and Buehler 1999).


Problem [Brodeur]Problem [Brodeur]

•Availability of multiple geospatial databases on the Web;

•Each database or information community uses a specific vocabulary;

•Databases are heterogeneous at syntactic, structural and semantic levels;

•Many users benefit from more than one geospatial database to satisfy their needs;

•Many problems such as the difficulty to locate geospatial data

–Locating: search, identification, selection and extraction of geospatial data from external sources.


ProblemProblemNTDB1 VMap2

BC Digital Baseline Mapping (BCDBM)3

ON Digital Topographic

Database (ONDTD)4 BDTQ5

Information sur les terres et les eaux pour la

province du Nouveau-Brunswick6

- Waterbody - Watercourse - Irrigation Canal - Navigable Canal - Flooded area - Reservoir - Liquid

depot/dump

- Lake/Pond - Lake subject to

inundation - River/stream - Coastline/shoreline

- Coastline - Ditch - Flooded land - Lake - River/stream

- Flooded land - Lake - River/stream

- Canal - Cours d’eau - Lac - Mare

- Canal - Rivière–trait double - Lac (?) - Littoral (?) - Lac de rivière (?)

- Wetland - Marsh/swamp - Marsh - Swamp

- Marsh/Fen - Milieu humide (végétation)

- Marais de canneberge (?) - Marais (?)

- Road - Limited access

road

- Road - Car track

- Road - Accesway - Road

- Voie de communication

- Autoroute - Rue - Chemin - Route

- Artère (?) - Route collectrice (?) - Chemin local (?) - Chemin municipal (?) - Chemin d’accès aux

ressources naturelles (?) - Route en construction (?) - Rue (?)

- Vegetation - Trees - Orchard/plantation - Vineyard

- Wooded area - Vineyard - Orchard - Nursery

- Wooded area - Milieu boisé - Verger (aires

désignées)

- Clairière (?) - Bande défrichée (>100m)

(?) - Pépinière (?) - Verger (?) - Rangée d’arbres (>100m)

(?) - Zone boisée (>2m haut)

(?) - Railroad - Railroad

- Railroad siding/railroad spur

- RailLine - Rail line - Voie ferrée - Chemin de fer (?) - Triage de chemin de fer

(?)

- Bridge - Obstacle to air

Navigation

- Bridge/overpass/viaduc (?)

- Bridge - Trestle

- Bridge (roadway)

- Bridge (railway) - Culvert

(roadway) - Culvert (railway)

- Pont - Pont

d’étagement

- Pont (?) - Ponceau (petit) (?)

Spatial pictogram descriptions: :0D ; :1D ; :2D ; ?:unknown geometry ; :multiple geometry ; :alternate geometry (see [Bédard, 1999 #231] and [Brodeur, 2000 #149] for more details). [Natural Resources Canada, 1996 #240]; 2[VMap, 1995 #117]; 3[BC Ministry of Environment Lands and Parks (Geographic Data BC), 1992 #121]; 4[OBM, 1996 #120]; 5[Québec, 2000 #123]; 6[New Brunswick, 2000 #243].

How does someone assess if the result he/she gets from his/her request corresponds to the initial perception of the reality he/she had in

mind when he/she sent that request?


Context – Metadata discoveryContext – Metadata discovery

• To bridge terminology and language gaps

• Search exactly the same concepts, vocabulary and language that the database uses; otherwise, their search may not yield relevant results.


Project – Multiusage, Project – Multiusage, Multistandard, and Multilingual Multistandard, and Multilingual Geospatial Ontology ServiceGeospatial Ontology Service

• Develop a geospatial ontology service that can be used by applications and other services

• The project was funded in March 2003 under the CGDI GeoInnovations program


ObjectivesObjectives

• Examine requirements related to geospatial ontologies

• Identify the operations that a service must fulfill to meet requirements

• Define Web protocols to access the service

• Develop the service using interoperability standards

• Technology assessment


ParticipantsParticipants• Developers

– CRG, Université Laval– Intelec Geomatics

• Users– Ministry of National Defence

– Ministère des Ressources naturelles du Québec

– Ministry of Fisheries and Oceans (CHS

– Natural Resources Canada (CTI-S & CCRS)

– NatureServe Canada

– Environment Canada

– Commission for Environmental Cooperation


InputsInputs

• Scope– Language known by client (service)– Ontology of keywords

• Ontology in text or DBMS • Initial Content (GCMD-bilingual, IHO B6

and S57)• Guide for building ontologies• UTF-8 for character encoding


Protégé - software relatedProtégé - software related

• Free, open source, java

• Customizable editor

• Plugins can be added

• Database can be accessed by an API


Protégé can be useProtégé can be usedd for the following for the following

• Class modeling. Protégé provides a graphical user interface (GUI) that models classes (domain concepts) and their attributes and relationships.

• Instance editing. From these classes, Protégé automatically generates interactive forms that enable you or domain experts to enter valid instances.

• Model processing. Protégé has a library of plug-ins that help you define semantics, perform queries, and define logical behavior.

• Model exchange. The resulting models (classes and instances) can be loaded and saved in various formats, including XML, UML, and RDF (Resource Description Framework). Protégé also provides a scalable database back end.


Data ModelData ModelONTOLOGIE

SERVICE

LOCALISATION

Schem a Nam e MCD Ontologie

OGM3

Schema Information

Project Nam e

File Nam e

MJ ProulxIndividual

CRG- Univers ité LavalOrganization

d:\m arie\ogm 2\m cd\m cd_ogm _v5.vsd

Vers ion Vers ion Date4.0 07-07-2003

SOURCE

Perceptory 2003

LANGAGE

Français - Canada (latin)Anglais - États -Unis (latin)

<<ÉNUMÉRATION>>

NOM

identifiantnomcode nomdéfinitionpréférévernaculaire 0,1langage !: langage

NOM TYPE

catégoriethèm eterm evariablelieu...

<<ÉNUMÉRATION>>

ONTOLOGIE

identifiantnomtype d'ontologiedom aine d'intérêtsys tèm e de coordonnéesresponsable !date dernière m aj/langage!: langage

TYPE

idenfiantnom type: nom typedéfinitionpréférélangage !: langage

SOURCE

identifianttitrenom alternatifbrève descriptionéditiondate publicationurlSourcelangage !: langage

AUTEUR

organisationpersonne contactcourrielnum éro téléphoneadresse !

CONCEPT

identifiantdate dernière m aj

pro

vie

nt 1

,N

docu

me

nt 0

, N

do

cu

me

nte

0,N

pro

vie

nt 1

,N

0,Nes t équivalent à 0,N

RELIER

type relation: type relationpréféré 0,1cons truction/identifiant ontologie 0,1pourcentage

TYPE RELATION

englobant (part/whole)synonym e (related)quas i-synonym e (related)polysém ie (related)

<<ÉNUMÉRATION>>

Rem arque: ce m odèle est le résultat conjoint de lam odélisation des projets GRID et GéoinnovationOGM3 dont le RDDC- Valcartier et le CRG-Université Laval sont partenaires.

ASSOCIER

pourcentage

RÉFÉRER

pourcentage

RÈGLE

idetifianttype règle: type règledéfinitionlangage !

TYPE RÈGLE

m inusculelem m atisation m asculinlem m atisation plurielnom versus adjectifretrait s ignes diacritiques

<<ÉNUMÉRATION>>

régit 0,Nest régit par 0,N

paquetage

note

- - - et - - - condition "et", i.e. les deux relations doivent être sais ies .

/ classe, attribut ou association dérivés

! attribut com plexe i.e. com posé de plus ieurs attributs

0,1 cardinalité (association, attribut et géom étrie)

exis tence/évolution (date de naissance, m ort ou évolution)d'une classe, attribut ou association

géom étrie or géom étrie dérivée

évolution spatiale (date début et fin de validité de la géom étrie)

LÉGENDE

LOCALISATION

identifiantbounding box !

FEUILLET CARTOGRAPHIQUE

num éronom feuilletéchellesys tèm e découpage

localise 1,1réfère 0,1,

inclut 0,Nes t incluse 0,N

SERVICE

identifiantadresseURLServiceprivilèges 1,Ncom pétences 1,N

GetOntologyGetPreferedGetSim ilarGetTrans lation

gè

re 1

,N

est g

éré

e

1,1


TechnologiesTechnologies


OperationsOperations

• GetCapabilities• GetOntology• GetDefinition• GetPrefered• GetSimilar• GetTranslation• GetGraph


DemonstrationDemonstration

http://intelecgeomatics.com:8080/ogm3/default.jsp


Entry PageEntry Page


Server CapabilitiesServer Capabilities


GetOntology RequestGetOntology Request


GetOntology ResponseGetOntology Response


GetDefinition RequestGetDefinition Request


GetDefinition Response 1GetDefinition Response 1


GetDefinition Response 2GetDefinition Response 2


GetPrefered RequestGetPrefered Request


GetPrefered ResponseGetPrefered Response


GetSimilar RequestGetSimilar Request


GetSimilar ResponseGetSimilar Response


GetTranslation RequestGetTranslation Request


GetTranslation ResponseGetTranslation Response


GetGraph RequestGetGraph Request


GetGraph ResponseGetGraph Response


Thank youThank you

Questions ??Questions ??


M3GO

Protégé-2000 Presentation


Protégé - software relatedProtégé - software related

• Free, open source, java

• Customizable editor

• Plugins can be added

• Database can be accessed by an API


Protégé can be useProtégé can be usedd for the following for the following

• Class modeling. Protégé provides a graphical user interface (GUI) that models classes (domain concepts) and their attributes and relationships.

• Instance editing. From these classes, Protégé automatically generates interactive forms that enable you or domain experts to enter valid instances.

• Model processing. Protégé has a library of plug-ins that help you define semantics, perform queries, and define logical behavior.

• Model exchange. The resulting models (classes and instances) can be loaded and saved in various formats, including XML, UML, and RDF (Resource Description Framework). Protégé also provides a scalable database back end.


MetaclassesMetaclasses

M3GO implementation inside Protégé is composed of 3 metaclasses:

• ONTOLOGIE• CONCEPT• NOM

A metaclass is a template, or a class whose instances are themselves classes


Each metaclass is defined by a set Each metaclass is defined by a set of attributes called slotsof attributes called slots


SubclassesSubclasses

• M3GO uses 11 subclasses to implement the model

• Each subclass is also defined by a series of properties (slots)


Adding a slotAdding a slot

Slots are properties or relationships between classes


Building an OntologyBuilding an Ontology

Building an ontology is done by implementing previously defined metaclasses in a hierarchical manner


Example: a ValleyExample: a Valley


Forms are automatically generated and fully Forms are automatically generated and fully customisablecustomisable


Protégé’s pluginsProtégé’s plugins

• Storage– CLIPS – XML – XML Schema – RDF – OIL (Ontology Inference Layer) – DAML+OIL – UML– XMI

• Visualization– Jambalaya – TGVizTab– OntoViz

•Project and file management –BeanGenerator –DataGenie–Prompt

•Etc.


Thank youThank you

Questions ??Questions ??

canada centre for remote sensing - ess ontology work @ geoconnections cgdi & ccrs nrcan brian...

Documents

remote sensing slide

canada centre fo

remote sensing essobjectives

api slide

extraction of geospatial

geospatial data locating

geospatial ontologies

steps overview slide