scar feature type catalogue henk brolsma / ursula ryan – australian antarctic division steffen...
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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
• http://www-aadc.aad.gov.au/gis/model/