Feature Catalogue Services 1st August 2010 Kim Finney (Manager, Australian Antarctic Data Centre & Chief Officer, SCAR Standing Committee on Antarctic Data Management)
What Are Feature Types Feature Types: Real world objects (e.g. Bicycle, Tyre, Road, River, Airport, Mountain, CTD Observation, ARGO Float Observation) 100,50,2 300,75.4 X=56 WMS maps WFS feature data WCS coverage data M11 <gml:LineString srsName="EPSG:4326"> 0, , ,60.9 motorway 11
Used in Gazetteers Feature_Type: Range Feature_Type Id: 7 Feature Instance: David Range Feature Instance Id: 3364 Gazetteer_Name: David Range Latitude: 67° 50' 00.0" S Longitude: 62° 32' 17.0" E SCAR_Gaz Id: 3364
Feature Catalogue
Take opportunity to enhance catalogue data model Capture information on Community Profiles (i.e. agreed suites of feature-types, their attributes - their units of measure and datums, feature-type relationships and classification schemes used, all linked to a specific user community or use by a computer-based tool); Assign one or more spatio-temporal geometries to a feature-type, List Classification Schemes and Themes that feature-types might be associated with, and Exercise the feature association component of the ISO model to record information about relationships between features (both internal and external to the catalogue). Chose to create RESTful (Representational State Transfer) Services From Application To Service
Developed 3 types of service to meet different use- cases A typical REST Service query looks like: …/StreamlinedCatalogueService/Profiles/1/FeatureTypes/10/Format/XML This service returns information on Feature Type with ID=10 that belongs to Community Profile ID=1 in an XML format. Using this particular type of service call (i.e. a StreamlinedCatalogue Service) a client is able to: Get all features for profile n Get all features for all profiles Get feature n in profile n
…/IterativeCatalogueService/Profiles/1/FeatureTypes/10/Attribute/3/Format/SKOS This service returns information on Attribute with ID=3 associated with Feature Type with ID=10 that belongs to Community Profile ID=1 in a SKOS format. Using this particular type of service call (i.e. a IterativeCatalogue Service) a client is able to: Get profile n or all profiles, Get all features for profile n, Get all features for all profiles, Get feature n in profile n, Get attribute n, or all attributes for feature type n in profile n, Get geometry n, or all geometries for feature type n in profile n, and Get UoM n and associated Datum, or all UoMs for attribute n in feature type n in profile n
StreamlinedCatalogueServiceService Type - Delivers more information in one hit versus an iterative drilldown IterativeCatalogueServiceService Type - Delivers via progressive drilldown through a profile Profiles/n/Get information for profile with ID=n Profiles/if no value after this switch, then all profiles are returned Profiles/n/FeatureTypes/if no value after this switch, then all feature-types are returned that are associated with profile with ID=n Profiles/n/FeatureTypes/10/Get information for feature type ID=10 Format=xml (default)Output formats that will become available (with possible additional values of: html owl or skos) ComponentCatalogueServiceService Type - gets the components of the Feature Catalogue (Feature Type, Geometry, Attribute, UoM, Datum or Relationship ) FeatureType/nGet information for FeatureType with ID=n Geometry/nGet information for spatiotemporal geometry with ID=n Attribute/nGet information for attribute with ID=n UoM/nGet information for UoM with ID=n UoMGet information for all UoMs Relationship/nGet information for relationship with ID=n