GIS-T Stovepipes: Barriers to Geospatial Interoperability David Loukes, P. Eng. Geoplan Consultants Inc. March 26, 2002 Atlanta, GA 1 GIS-T Stovepipes Presentation Overview • Stovepipe technology issues: Lack of GIS-T interoperability standards Proliferation of personal geodatabases Technology architecture complexities IP issues • Parting thoughts 2 GIS-T Stovepipes Geospatial Trends • NSDI / GSDI initiatives • Advanced, more accurate data collection methodologies • Move toward web enabled applications • Concern over IP issues 3 GIS-T Stovepipes National / Global SDI Initiatives • There is a growing interest in national and international Spatial Data Infrastructure (SDI) initiatives • National: NSDI (US) CGDI (Canada) Others … 27 nations in 1998 (U. of Maine) • Growing international commitment for a Global Spatial Data Infrastructure (GSDI) 4 GIS-T Stovepipes Today: Global Reach On the Way Clearinghouse Sites Gateways Others Web Client FGDC CEONet Source: Mark Reichardt, US FGDC 5 Others GIS-T Stovepipes Node Node Node Node Node Node Node Node Node Node Node Node 6 GIS-T Stovepipes (G)SDI Emerging Standards • • • • 7 ISO TC 211 / 204 Open GIS Consortium ISO/JTC1 SC32 - SQL/MM Others ... GIS-T Stovepipes The DOT Role in NSDI / GDSI • NSDI / GSDI initiatives moving toward interoperability – access to geospatial data across organizational boundaries • DOTs and other transportation agencies have a considerable amount of data that should be contributed to these initiatives CGDI studies have clearly identified transportation network data as the number 1 priority among users • Result: “enterprise GIS-T” extends far beyond the boundaries of any one transportation agency • Example: the GeoConnections National Road Network initiative 8 GIS-T Stovepipes National Road Network (NRN) • Being developed by Natural Resources Canada as part of the GeoConnections program • Objectives: Develop transportation network “core” data in support of the CGDI Provide a framework upon which “value added” data can be overlaid • Concept: collect data once, as close to the source as possible, and share across jurisdictional boundaries • The NRN will likely incorporate a LRS data model in support of provincial and municipal road network data requirements 9 GIS-T Stovepipes The GIS-T Data Model Stovepipe • Open GIS standards for interoperability so far are restricted to simple features (points, lines, polygons) • A great deal of the useful attribution related to transportation networks is stored as LRS events along routes • There are no open standards at present for the GIS-T data model extensions necessary to support the transfer of LRS event data features among unlike systems • Result: the GIS-T data model stovepipe 10 GIS-T Stovepipes GIS-T Data Model Research • Current “best practice” transportation data model standards need to be integrated NCHRP 20-27 (3) ISO GDF others? • The “new and improved” transportation data model needs to be incorporated into the Open GIS standards 11 GIS-T Stovepipes Advanced Data Collection Methods • Many advanced data collection technologies are now available: GPS Digital videolog Multi-purpose vehicles Had-held and voice activated computers Others … • These technologies have made it far easier to collect transportation infrastructure data quickly and with improved location accuracies • Result: proliferation of personal / workgroup geospatial databases due to stovepipe issues 12 GIS-T Stovepipes GIS-T Data Collection Stovepipes • The technologies are easy to use and cost effective • It is often possible to justify the acquisition of these systems in support of very specific applications • Result: Data may not be collected according to corporate geospatial data standards Differing accuracies may make integration with existing data layers difficult Multiple road centerline representations exist 13 GIS-T Stovepipes Data Standards Stovepipe Issues • Project based data collection missions may not adhere to corporate data standards for: Location (LRS, coordinate framework) Attributes (fields, allowable values) Metadata (lineage tracking) • Result: inability to integrate data into corporate road asset databases 14 GIS-T Stovepipes Accuracy Stovepipe Issues • Mixed accuracies: Existing GIS-T basemaps and road network features commonly based on 1:10K – 1:24K compilation specifications, with associated accuracies of +/- 2.5 meters or greater GPS data collection methods can now achieve submeter positional accuracies • Result: features show up “in the wrong place: Signs appear on the wrong side of the road Bridges are not positioned over rivers / streams Anchor points don’t fall on topological nodes • Reconciliation of these problems may be time consuming and expensive 15 GIS-T Stovepipes Centerline Stovepipe Issues • With GPS, it is possible to collect a new road centerline during each data collection mission. • This presents the following issues: Do you update the network geometry after each mission? How do you filter out unnecessary shape points? How do you reconcile the new geometry to the existing base network: • Which nodes should be moved? • Does the associated LRS need to be updated? • Result: data may not be used 16 GIS-T Stovepipes Architecture Complexity Issues • Technology architecture: we have (evolved?) from mainframe to workstation to PC to Client - Server to web-based • We are now dealing with “n-Tier” architectures and many components (“Plug and Pray”) • What happens when something goes wrong? 17 GIS-T Stovepipes Multi-tier Architecture for Components GIS & applications (ESRI, CARIS, INGR) DB servers Integration Tools Tools for modeling, cleaning, integrating and loading data. File servers Access Tools Tools for query, analysis and reporting. (Web-based preferred) App Servers Data Management Tools Object-Relational DBMS + with Spatial enhancements Ref: Kucera, H., “The Open GIS Consortium … a focus on interoperability” GIS-T Stovepipes Tier 2 Application Servers File manager Data files 18 Application Environments Data Access Protocols & APIs Network Interface APIs - (OGDI, OGC & CGI) Meta-Data Management (Repository) Tier 3 Tier 1 Data Management & Data Server Environment IP Issues • In the IT community, it’s never the technology that’s the primary barrier to data integration / interoperability CGDI framework and NGTN studies: the main barriers are associated with intellectual property (IP) issues: cost, licensing, copyright • In Canada, cost recovery programs have seriously impeded data sharing Now trying to overcome these barriers • Don’t repeat our mistakes! 19 GIS-T Stovepipes Final Thoughts … • General GIS interoperability is achievable in the near term • Specific GIS-T interoperability (ie, LRS) is farther out • Neither is possible without some convergence on data model and data content specifications for the spatial database • Field data collection needs to be carried out within a corporate data standards context • Geospatial data is a corporate resource The enterprise extends far beyond DOTs • Don’t let IP issues drag you down 20 GIS-T Stovepipes Changing Face of GIS GIS-Centric Applications Spatially Aware Applications exor app Desktop GIS Browser GIS Spatial Processing Digital Maps Text Data Spatially Enabled Database Source: Graham Stickler, Exor Corporation 21 GIS-T Stovepipes Discussion? • This is one perspective • There are many others … • Let’s hear from you! 22 GIS-T Stovepipes