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 11. SQL/MM – A Basis for Cross-platform, Inter-operable, and Reusable SQL

While Oracle's SDO_GEOMETRY type is very widely used, even by the open source community, which promotes the virtues of standards conformance and compliance, many in the geospatial industry still criticize Oracle's SDO_GEOMETRY for its lack of perceived standards compliance. Whether this criticism is based on ignorance or maleficence, SDO_GEOMETRY is standards compliant in its storage, geometry description, and with some functions, but its API is not fully compliant.

However, SDO_GEOMETRY is not the whole story. Oracle also provides an ST_GEOMETRY object type, which is an implementation that is based on the ISO 13249-3, Information Technology – Database Language Spatial – SQL Multimedia and Applications Packages – Part 3: Spatial standard (hereafter known as SQL/MM). This chapter aims to show that such criticism of standards compliance of Oracle is limited and ill informed, through an exposure of the benefits...