Spatial Information Integration Services (SIIS) ISO/TC211 Workshop on Standards in Action Adelaide, South Australia October 2001 Mr. Neil Sandercock, SA.
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Spatial Information Integration Services
(SIIS)
ISO/TC211 Workshop on Standards in ActionAdelaide, South Australia
October 2001
Mr. Neil Sandercock, SA Spatial Information CommitteeMr. Rob Crompton, Aspect Computing Pty Ltd
A South Australian implementationof ISO 19115
Agenda
• The SA Govt’s Spatial Initiative• SIIS Overview
– the vision, design objectives, business models
• Data Discovery– technology & standards– using an object model for metadata– Real World Views and Information Community
Views
• Lessons learned
The “Spatial Initiative”• The SA Govt’s Spatial Initiative was
conceived in 1992• Enjoys highest level of support• Its objectives are to:
– build a sustainable, export-focused spatial industry in SA
– gain operational efficiencies by process reform within government
– empower the community and industry with ready access to government information
The SIIS Vision
• “to develop and implement the technology for a spatial information infrastructure for the SA government and the broader community that will enable spatial information from any number of disparate data sources to be accessed by users and business systems anywhere across the State”
Design Objectives• generic, best-of-breed components, open,
scalable, distributable• support existing standards, reactive to new and
evolving standards• support legacy systems (preserve existing
agency investments)• vendor independent• provide clear separation of responsibilities
(custodian, deliverer, client)• able to be commercialised
The Spatial Business Model
Policy and Standards
High Level State Needs
economic, community, environment
Govt Business Needs
asset management, emergency response, environmental protection, land administration, resource development
Spatial Applications
Spatial Information Integration Services
Spatial Datasets
Spatial Information Integration Services
SIIS Services Model
Web Interface
Dataset Interfaces
Directory Services
Service Manager
Security Services
Accounting and Commerce Services
Query and Response Services
Integration Services
Datasets
Access Services
API
Spatial Browser Agency Applications
Client
Service Deliverer
Data Custodian
Application Interfaces
Spatial Information Integration Services
Data Discovery
presented by
Mr Rob CromptonAspect Computing Pty Ltd
The SIIS Project
• Technology– Built around strategic commercial-off-the-
shelf technologies – scalable, open architecture– browser-based (of course)– designed to handle medium to high data
volume spatial queries from multiple data sets
– multi-thread capable
The SIIS Project
• Standards used– ISO 19110: providing a framework for
classifying real world phenomena in a set of geographic data
– ISO 19115: providing a structure for describing digital geographic data in metadata
– ISO 23950: providing a standard for communicating between library/information based systems
The SIIS Project
• Specific themes & features for creating the Real World View from:– AS 2482 & AS 4270: feature coding for
spatial data interchange– FGDC: US Federal Geographic Data
Committee– DIGEST: Digital Geographic Information
Exchange Standard– TSSDS: US Tri Service Spatial Data Standard
Data Discovery
• Two stages of discovery:– select an “area of interest”
• via a polygon on a map• via a gazetteer
– search through metadata• via a theme search using a pre-defined
Information Community View• via field searches
Data Discovery
• Spatial metadata is:– structured according to ISO 19115
• ISO 19115 CD1 is to Draft ISO 19115 as HTML is to XML
• structure specified by UML which we translated to a relational database structure
• DTD specified as part of ISO 19115
– organised into categories via Real World Views & Information Community Views
Views
• The Real World View (RWV) is an ISO 19110 defined structure for the naming of geographic entities
• Information Community Views (ICV):– map to the RWV– use the terminology of a particular user
community to make searching easier– a catalogue for a particular community
Views
• The RWVs and ICVs have hierarchical structures
• For example, an ICV for “Environmental Management”– themes (hydrography)
• feature types (aquifer recharge area)– attributes (flow rate, salinity, discharge, pH etc)
Views
EnvironmentalManagers
PropertyDevelopers
LocalGovernment
InformationCommunities
Metadata record
Metadata record
Metadata record
RealWorldView
InformationCommunity
View 1
Metadata"catalogues"
InformationCommunity
View 2
InformationCommunity
View 3
MetadataDatasets
Lessons Learned
• Converting existing metadata into the new structure requires a significant effort - plan for it– scripts & parsing to leverage any structure
existing in the original metadata
• Maintain the principles of good user-interface design for metadata maintenance whilst grappling with the complexity of the standards and how to implement them
Lessons Learned• In general, the standards are abstract,
specifying structure but little on content or specific examples– ill-defined metadata elements / fields– difficult to determine the intent of the
Committee
• There is no single source of information on which to develop a RWV - we consolidated our RWV from a large number of standards & guidelines
Lessons Learned
• working with an evolving standard requires a strong link to the standards body: we were able to provide valuable feedback on improvements
• Obtaining copies of draft Standards by “early implementers” requires a process – straightforward & cost free
Lessons Learned• provides a significant opportunity to
upgrade Government spatial data to leverage the open approach (eg Gazetteer)
• Implementation technologies are immature & rapidly improving– choice of Java (J2EE) was the correct strategic
choice– XML will open up the exchange of spatial
information between governments and private sector users
Questions
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