Introduction 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