1. Spatial Data Server for Mobile Environment EDBT 2004, Greece March 16, 2004. B.W. Oh, M.S. Kim, M.J. Kim, and E.K. Lee Spatial Information Technology Center, ETRI

2. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 2 RESEARCH ABSTRACT ▣ A Spatial Data Server for Mobile Environment ▣ Objectives ◈ An Interoperability –Independent from various types of platforms and systems –International standards and recommendations ◈ A Better Performance for Mobile Devices –Higher speed of data processing time and network response time –Efficient memory management and network transmission

3. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 3 OVERALL ARCHITECTURE Spatial Data Provider (SDP) Spatial Data Manager (SDM) Spatial Query Manager (SQM) Spatial Data Configuration Tool (SCT) Internet Information Server (IIS) INTERNET Spatial DB

4. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 4 FOUR MANAGERS (1) ▣ Spatial Data Provider (SDP) ◈ Standard interface of spatial database ◈ Simple feature specification for OLE/COM ▣ Service Configuration Tool (SCT) ◈ An executable file ◈ Invokes the SDM at the beginning ◈ Reads spatial data through the SDP from databases or files ◈ Loads the data into the main memory using the SDM ◈ Selects the SDP and spatial data sets ◈ Saves configuration information as an XML format

5. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 5 FOUR MANAGERS (2) ▣ Spatial Data Management Component (SDM) ◈ Manages spatial data in the main memory ◈ Converts spatial data from SDP into a target data format ◈ Stores and provides GML data in the main memory ◈ Fetches spatial data corresponding to user’s query ◈ An out-of-process COM server ◈ Shared with other processes such as the SCT and the SQM ◈ The R*-tree for a spatial index structure

6. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 6 FOUR MANAGERS (3) ▣ Spatial Query Management Component (SQM) ◈ Manages users’ query on the web environment ◈ Invokes the SDM to fetch spatial data ◈ The Web Feature Server (WFS) specification from OGC ◈ Basic WFS (GetCapabilities, DescribeFeatureType, GetFeature) ◈ Internet Server Application Programming Interface (ISAPI) extension component ◈ GML data format

7. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 7 ADVANTAGES ▣ International Open Standards ◈ Simple Feature Specification for OLE/COM ◈ Web Feature Server (WFS) from OGC ◈ Geography Markup Language (GML) from OGC ◈ Give an interoperability ▣ Optimization for Mobile Environments ◈ The main memory based processing for fast access time ◈ Management of target format for fast conversion time ◈ The R*-tree for a spatial index structure for fast search time ◈ Progressive network transmission for fast response time ◈ Internet server technology for reduced overload of system

8. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 8 SYSTEM FEATURES Spatial Data Provider (SDP) Spatial Data Manager (SDM) Spatial Query Manager (SQM) Spatial Data Configuration Tool (SCT) Internet Information Server (IIS) INTERNET ISAPI Extension EXE COM Server DLL Simple Features Specification (SFS) for OLE/COM Web Feature Service (WFS) Implementation Specification Geography Markup Language (GML) Implementation Specification

9. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 9 FOR DEMONSTRATION ▣ Use of Main Memory with Target Data Format ◈ Loads spatial data in the main memory ▣ GML Data Format ◈ A target data format for storage ◈ Law format can be displayed on web browser ▣ Web Application System using the Spatial Data Server ◈ Displays 3 kinds of spatial data on a viewer ◈ Operation –Obtains spatial data from the proposed spatial data server –Converts the obtained data into internal data format suitable for graphic presentation –Displays the spatial data into browser

10. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 10 LOAD SPATIAL DATA in MEMORY

11. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 11 GML LAW FORMAT GetFeature

12. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 12 SIMPLE GML VIEWER

13. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 13 APPLICATIONS (1)

14. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 14 APPLICATIONS (2)

15. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 15 APPLICATIONS (3)

16. 4S4S ITS GIS SIIS GNSS www.4s.re.kr www.etri.re.kr Tangible GIS Research Team, Spatial Information Technology Center, ETRI 16 CONCLUSION ▣ Proposed ◈ A geographic feature server for interoperability with efficient performance ◈ For Interoperability –Takes international standards –Simple feature specification for OLE/COM, WFS, and GML ◈ For Optimization –Use of main memory, management of target data format (GML), and spatial indexing (R*-tree) ▣ Further Research ◈ Take updated standards –Geography Markup Language, Catalog Service & Web Registry Server ◈ Make standards update –Makes Web Feature Server support XML Web Services

17. Thank You For Your Attention EDBT 2004, Greece March 16, 2004. Questions? Dr. B.W. Oh (bwoh@kumoh.ac.kr)