Building an Enterprise GeoDatabase to Support a Service Oriented Architecture

Transcription

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2 Dan Widner VDOT Paul Bucher Keane, Inc

3 Historical Perspective and Vision Technical Approach

4 Historical Perspective and Vision

5 A Bit of History Legacy system for managing linear referenced business data (early 1990 s to present) Classic mainframe, non-relational, non spatial system for managing classic ISTEA needs Enterprise GIS established 2001 to support agency GIS needs Enterprise spatial data repository for raster and vector data Web-based access for viewing and querying Primary platform of Oracle and ESRI

6 More Bits of History Agency focused upon establishing an environment that would house enterprise geospatial data and provide access to those who needed it. 80/20 Rule 80% of users need to view and query, no more 20% need more powerful, desktop analysis capabilities Dual purpose of exposing data through GIS, as well as supporting spatial analysis needs of agency business units Identified short and long term strategies Integration with GIS mandated for all forthcoming information technology applications

7 Current Environment: Over 100 spatial data layers available 1.7 Tb of data One large spatial data repository to support multiple applications. Supports web applications both internal & external Data served via multiple ArcIMS web map services (XML based)

8 Going Forward Spatially enabling our business processes Will provide backbone of data/information for decision support Accomplished by developing applications that leverage enterprise spatial data repository, enterprise systems and architecture Implement Service Oriented Architecture Supports integration of geospatial technology into applications Continue geospatial integration of applications Location Referencing Methods web services The Roadway Network System - RNS

9 Vision into Action RNS Modernize Roadway Inventory Application Spatially enable Road Inventory management process Provide true integration with other agency systems Provide location referencing services for agency business systems

10 Technical Approach

11 % Building an Enterprise GeoDatabase to Support RNS Conceptual Architecture %

12 Transportation GeoDatabase Model

13 Interim LRS

14 Need Location Model to Support Change

15 Normalize Location Model Change Table Events Routes Measures Anchor Section Anchor Points Edge Junctions Events (Business Data Objects) Location Referencing Features (Name Tables, X-Refs, LRMs, etc.) LRS Datum (Anchor Sections/Points) (Features with Measures) Base Reference Features (Edges/Junctions) (No Measures)

16 RNS Location Model LRS Datum Tables Base Reference Features

17 RNS Location Model Route Tables

18 RNS Location Model Event Tables Building an Enterprise GeoDatabase to Support

19 Benefits of Location Table Normalization ONE BASE GEOMETRY BUT Multiple route systems Multiple measurement systems Multiple spatial representations Multiple locations for event Multiple points in time over life cycle Use SQL for route and measure transformations

20 Drawbacks of Location Normalization At data storage level more difficult to visualize More details to manage Errors more visible Mitigate Drawbacks Create Views to make it easier to visualize data Create Abstract Methods to interact with data Expose methods as Web Service / Map Service

21 Mitigate Drawbacks Create Views Source for Geo Processing Event Tables To Build Anchor Section Features To Build Routes To Build Event Layers and Features Source for Presentation Database De-normalized Features De-normalized Business Tables

22 Create Abstract Methods -Request Map -Request Attribute -Request Location

23 Linear Referencing Service Methods Distance from a Known Point Route Origin Jurisdictional Boundary Intersecting Route Another Event Based on existing LRM measure with given LRM Currency Date X/Y Coordinates (GPS)

24 Mitigate Drawbacks Create Web Service / Map Service Integration with External Systems Integration between RNS Sub Systems Integration for Web Application Components Query Data View Edit Data View Map View Straight Line Diagram View

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