Book Image

Applying and Extending Oracle Spatial

Book Image

Applying and Extending Oracle Spatial

Overview of this book

Spatial applications should be developed in the same way that users develop other database applications: by starting with an integrated data model in which the SDO_GEOMETRY objects are just another attribute describing entities and by using as many of the database features as possible for managing the data. If a task can be done using a database feature like replication, then it should be done using the standard replication technology instead of inventing a new procedure for replicating spatial data. Sometimes solving a business problem using a PL/SQL function can be more powerful, accessible, and easier to use than trying to use external software. Because Oracle Spatial's offerings are standards compliant, this book shows you how Oracle Spatial technology can be used to build cross-vendor database solutions. Applying and Extending Oracle Spatial shows you the clever things that can be done not just with Oracle Spatial on its own, but in combination with other database technologies. This is a great resource book that will convince you to purchase other Oracle technology books on non-spatial specialist technologies because you will finally see that "spatial is not special: it is a small, fun, and clever part of a much larger whole".
Table of Contents (20 chapters)
Applying and Extending Oracle Spatial
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Table Comparing Simple Feature Access/SQL and SQL/MM–Spatial
Index

Chapter 7. Editing, Transforming, and Constructing Geometries

Desktop GIS, CAD, and Extract Transform and Load (ETL) software provide a rich set of tools that the experienced operator can use to construct, edit, or process geometric objects. But few realize that creating and applying such functionality within the database is also possible and can be more effective, efficient, and less complicated.

While the Oracle database SDO_GEOMETRY data type provides an excellent storage, search, and processing engine for spatial data, what users often overlook is its ability to provide geometry modification and processing capabilities. These can be used in database objects such as views, materialized views, or triggers for the implementation of specific business functionality; with that functionality being available to any software product that connects to the database.

The functions in Chapter 6, Implementing New Functions, were about highlighting the structure of an SDO_GEOMETRY object and its processing...