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 8. Using and Imitating Linear Referencing Functions

The goal of this chapter is to use the functions created in the previous chapters to build new functions that can be used to solve business problems relating to managing linear assets. The main business problems that need this functionality are road, cycle way or track management, geocoding street addresses, survey, inventory, condition assessment, and water management applications.

Oracle Spatial has a robust linear referencing package (SDO_LRS) that can be applied to all these problems. The SDO_LRS package can only be licensed for use by purchasing the Spatial package and deploying it within an Oracle Enterprise database. In addition, SDO_LRS cannot be purchased separately from the whole Spatial package. Finally SDO_LRS cannot be used with Locator.

The functions created in this chapter will provide SDO_LRS functionality where licensing of the SDO_LRS package is beyond the user's resources. These functions will support simple linear...