Moving Dynamic Segmentation to the Server: Linear Referencing for Web- Based Applications

Transcription

1 Moving Dynamic Segmentation to the Server: Linear Referencing for Web- Based Applications Paper Graham Stickler and Rob Coupe Exor Corporation

2 Contents Why move things to the database Oracle spatial features Nmv3 features How does it fit with Oracle spatial? What functions do we support now Use of API Describe ArcGIS client Where are we going?

3 In the future For most users the network will be an intranet or internet Most GIS-T users will access the system using a web-browser Highways data will be required to be accessible to many more customers The GIS-T system architecture will therefore need to be centred on Web-technologies

4 Enterprise Information System Field Users Non-GIS users Asset Managers Network Editors Browsers Cartographers Spatial L.R.S.

5 Architecture Based On Oracle 9iAS Exor Browser Exor Client Internet Wireless Web Server Oracle 9i Application Server Map Service Forms Service Exor Services NM API Map Store Stored Procedures Exor Metadata Oracle Spatial Referenced Data

6 Key Technology Components Oracle 9i Release 2 Database Server Oracle Spatial LRS Objects Extension Exor LRS Engine (Oracle 9iAS)

7 Spatial LRS Server Object based and speaks XML Embedded within the Oracle engine for fast performance References foreign data Supporting a published API Supports an unlimited range of thin clients, including browser based Using Oracle Spatial as part of the server process An evolution based on existing stable, extensively used COTS product

8 Object Model 3 basic objects define a simple model network elements placements assets Assets may be stored in Foreign Tables Any object may have spatial representations

9 Object Manipulation Internal packages Extensive use of VARRAYS Date-based views Published API calls Select nm3sdo.get_xy_from_measure(94,143,9000) from dual; SDO_GEOMETRY(3301,262148,NULL,SDO_ELEM_INFO_ARRAY (1,1,1),SDO_ORDINATE_ARRAY( , ,9000))

10 SDO Geometry SDO_geometry(gtype, coords,.) 1002 point in 2 dimensions 3002 polyline in 3D 3302 measured polyline

11 Basic functions Basic LRS functions: Locate, Position, Place, Transform, Simple linear query across network elements, placements and time Simple asset query across attributes and locations Network navigation Complex query inner join (and) outer join (or) across network types Engineering dyn seg / slice-and-dice All queries return spatial vectors using core clip and merge functions on linear measures

12 Shape Options Stored or Derived? Immediate or Deferred? Generalisations and Schematics

13 Dynamic Segmentation Event Event Tables Event Tables Event Tables Event Tables Event Route Tables Tables Event Data Route Datums Route event shapes

14 ArcGIS Integration ESRI Customised application Client based on ArcView8 Ring fenced development Full use of the API Data passed using XML Data also available through ArcSDE and ArcIMS

15 ArcGIS Communication Direct Connect Oracle Objects for OLE XML ArcSDE XML A P I Oracle Spatial

16 First Phase ESRI Internet e-spatial/info Man ArcGIS ArcIMS NM3 API Oracle 8i ArcSDE A.N. Other GIS Editor Oracle Spatial LRS

17 ArcMap

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21 Oracle Forms Server Oracle Forms Server is a technology for serving up Oracle Forms applications via the Internet. Traditional Client/Server Architecture Web Deployment Architecture

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23 Business Users

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25 Browser Access

26 Summary Spatial server-side LRS has been constructed Permanent and dynamic segmentation Supports multi-client tools including web browsers Full ESRI implementation Capable of integrating large datasets

27 Thank you