Table of ContentsIntroduction to Object-Oriented GIS Technology Topics Introduction The world is complex... And changes with time... Programming the old way What’s wrong with this situation? Programming with objects What can be “object-oriented”? OO is not a panacea “Core” OO is the beginning Topics Object-oriented terms and principles Object identity Object encapsulation Object aggregation Classes and aggregation Geographic feature classes Geographic feature instances Simple OO Inheritance PPT Slide Extensibility by Inheritance Messages, methods, and polymorphism Dynamic binding Self and Super So what is an OO GIS ? What does this achieve for the customiser ? What does this achieve for the GIS systems programmer ? Topics Goals and objectives Early OO philosopher Object-oriented GIS design is easy Object-oriented design of complex systems is hard Fundamental Theory Object-oriented analysis and design Cheat. Use existing Patterns CRC Methodology CRC guidelines Action scripts Example scripts From analysis to design... From design to implementation... But you have to loosen up to describe the real world... Exercise: traffic intersection Exercise: change it again Topics OO-GIS: database re-engineering Spatial and non-spatial attributes Geometry as an attribute Active Representation - 1 Active Representation - 2 PPT Slide PPT Slide On-Demand Mapping Dynamic Generalisation Active Objects & Static Features -1 Active Objects & Static Features -2 Topology Management Multiple Topologies Relationships as objects Validation triggering and the object lifecycle Object lifecycle “reflexes” Value Reflexes Active Database Long transactions Versions and transactions - 1. Branching Versions and transactions - 2. Merging a Branch Versions and transactions - 3. Merging second branch Behaviour over time Geospatial project management Distributed data maintenance Summary of OO GIS types Topics Object-oriented database management systems RDBMS - ODBMS Key fields and join tables Object pointers Application-based vs. schema-based relationships Value-based queries RDBMS trade-offs RDBMS trade-offs - 2 ODBMS trade-offs ODBMS trade-offs - 2 Migrating between RDBMS and ODBMS Which is better suited for GIS and data warehousing? Topics Object and interoperability standards activities OMG CORBA & IIOP Microsoft COM, ActiveX ODBC, ADO and JDBC ODMG Object-Relational SQL-3 Java OGC OpenGIS™ Old Paradigm: Static Data Transfer OpenGIS: Dynamic Interoperability Architectural layers in a GIS Pluggable computing model Pluggable tools OpenGIS approach Model of location and geometry Features and coverages OpenGIS feature model Detailed feature model OpenGIS coverage model OpenGIS is an interface standard Well-known structures The Big Picture USIGS Common Facilities OpenGIS Services Architecture Geospatial Domain Access Services Other standards activities Topics Crop Subsidy Monitoring Per-Parcel Land Use Monitoring Dynamic Classification & Parcel Generation Mixed Vector/Raster Representation Benefits of OO for GIS - 1 Benefits of OO for GIS - 2 Benefits of OO Route Planning and Network Analysis Site Location & Land-Use Planning Storm Drainage Planning What does all this mean? New Markets Better “Mind Tools” Bringing GIS to decision-makers Topics GIS and OO Resources Good starting points International resources Academic resources Academic resources - USA USA National resources Other GIS Resources OO Resources Usenet Newsgroups OO Periodicals OO Conferences |
Author: David Arctur + Philip Sargent
Email: Philip.Sargent@computer.org Home Page: http://www.bigfoot.com/~Philip.Sargent/ Laser-Scan Ltd.: http://www.laser-scan.com Other information: Download presentation source (1,543kB zipped PowerPoint97) |