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PostGIS Cookbook. - Second Edition

You're reading from  PostGIS Cookbook. - Second Edition

Product type Book
Published in Mar 2018
Publisher
ISBN-13 9781788299329
Pages 584 pages
Edition 2nd Edition
Languages
Authors (6):
Paolo Corti Paolo Corti
Profile icon Paolo Corti
Pedro Wightman Pedro Wightman
Profile icon Pedro Wightman
Bborie Park Bborie Park
Profile icon Bborie Park
Stephen Vincent Mather Stephen Vincent Mather
Profile icon Stephen Vincent Mather
Thomas Kraft Thomas Kraft
Profile icon Thomas Kraft
Mayra Zurbarán Mayra Zurbarán
Profile icon Mayra Zurbarán
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Table of Contents (18) Chapters

Title Page
Packt Upsell
Contributors
Preface
1. Moving Data In and Out of PostGIS 2. Structures That Work 3. Working with Vector Data – The Basics 4. Working with Vector Data – Advanced Recipes 5. Working with Raster Data 6. Working with pgRouting 7. Into the Nth Dimension 8. PostGIS Programming 9. PostGIS and the Web 10. Maintenance, Optimization, and Performance Tuning 11. Using Desktop Clients 12. Introduction to Location Privacy Protection Mechanisms 1. Other Books You May Enjoy Index

Using geospatial views


Views in PostgreSQL allow the ad hoc representation of data and data relationships in alternate forms. In this recipe, we'll be using views to allow for the automatic creation of point data based on tabular inputs. We can imagine a case where the input stream of data is non-spatial, but includes longitude and latitude or some other coordinates. We would like to automatically show this data as points in space.

Getting ready

We can create a view as a representation of spatial data pretty easily. The syntax for creating a view is similar to creating a table, for example:

CREATE VIEW viewname AS 
  SELECT...

In the preceding command line, our SELECT query manipulates the data for us. Let's start with a small dataset. In this case, we will start with some random points, which could be real data.

First, we create the table from which the view will be constructed, as follows:

-- Drop the table in case it exists 
DROP TABLE IF EXISTS chp02.xwhyzed CASCADE;  
CREATE TABLE chp02.xwhyzed...
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