scar feature type catalogue henk brolsma / ursula ryan – australian antarctic division steffen...

SCAR Feature Type Catalogue

Henk Brolsma / Ursula Ryan – Australian Antarctic Division

Steffen Vogt – University Freiburg - Germany

Chronology

• Tokyo 2000 - XXVI SCAR

• Siena 2001 – Project Coordinators

• Hobart 2002 – Australia / Germany

• Shanghai 2002 – XXVII SCAR

AIMS Project

• Scope of the model

• Review ISO standards

• Produce and distribute draft

• Publish as SCAR standard

Feature Type CatalogueDefinition

• A feature catalogue is a catalogue containing definitions and descriptions of the feature types, feature attributes and feature associations occurring in one or more sets of geographic data, together with any feature operations that may be applied - ISO 19110

STANDARDS

• ISO Standards

• 19110 Feature cataloguing

• 19111 Spatial referencing by coordinates

• 19112 Spatial referencing by geographic identifiers

• 19113 Quality principles

• 19114 Quality Evaluation

Definitions

• Definitions

• Structure

• Symbology

Quality

• ISO 19113 Quality principles

• ISO 19114 Quality evaluation

• Purpose describing quality

• Quality Attributes

Component Model

FeatureType

Catalogue

OrganisationsAnd People

ObservablesDictionary

Species Taxonomy

DataRepository

DataRepository

MapCatalogue

MetadataCatalogue

ServicesCatalogue

Interface

InterfaceApplications

Keywords

Search

Register(using keywords)

Applications

Search

Symbology

Ontologies

Catalogs

Data Model: Services

Data Model : Feature Types

Feature TypeDefinitions

ExampleFeature

Strong or Weak Typing

• Is a feature best described as:GeneralFeature (attribute:type=“Hut”)

OrBuilding (attribute:type=“Hut”, beds=3)

OrHut (beds=3)

Or3 Bed Hut

• “Granularity” depends on usage requirements

Feature Type Catalogue

Name:- unique

Code:- unique- arbitrarily assigned- simple idenfication- facilitates documentation of changes

Feature Attributes can by- mandatory, - conditional (mandatory if applicable)- optional

general Attributes include- geometry (incl. the spatial reference system)- pointer to metadata (incl. data quality)- pointer to SCAR Gazetteer

Definition:- should be applicable to Antarctic applications- should be commonly accepted- preferably already established in the respective community

External Definition Sources- GEMET (multilingual, UNEP)- other SCAR projects- IHO- ...

Symbology

• Portrayal a function of Feature Type

• … + attributes

• E.g. Building (function=Hospital)

• Feature Type Catalogue used to classify entries in symbol libraries

• Symbol sets shared

+

Advantages• ISO compliant• Common and consistent semantics• Features have common structure• Easy to link to portrayal schemes (symbology)

• Easy to create GML schema• Feature Type Catalogue can be used as a

classification vocabulary• Fits into the bigger picture of distributed data

networks

SCAR Spatial Data Model

• it’s a dynamic document

• model@aad.gov.au

• http://www-aadc.aad.gov.au/gis/model/