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QGIS 2 Cookbook

You're reading from   QGIS 2 Cookbook Become a QGIS power user and master QGIS data management, visualization, and spatial analysis techniques

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Product type Paperback
Published in Apr 2016
Publisher
ISBN-13 9781783984961
Length 390 pages
Edition 1st Edition
Tools
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Authors (3):
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Anita Graser Anita Graser
Author Profile Icon Anita Graser
Anita Graser
Víctor Olaya Ferrero Víctor Olaya Ferrero
Author Profile Icon Víctor Olaya Ferrero
Víctor Olaya Ferrero
Alex Mandel Alex Mandel
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Alex Mandel
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Toc

Table of Contents (14) Chapters Close

Preface 1. Data Input and Output 2. Data Management FREE CHAPTER 3. Common Data Preprocessing Steps 4. Data Exploration 5. Classic Vector Analysis 6. Network Analysis 7. Raster Analysis I 8. Raster Analysis II 9. QGIS and the Web 10. Cartography Tips 11. Extending QGIS 12. Up and Coming Index

Creating views in SpatiaLite


In a database, view is a stored query. Every time you open it, the query is run and fresh results are generated. To use views as layers in QGIS takes a couple of steps.

Getting ready

For this recipe, you'll need a query that returns results containing a geometry. The example that we'll use is the query from the Joining tables in databases recipe (the previous recipe) where attributes were joined 1:1 between the census polygons and the population CSV. The QSpatiaLite plugin is recommended for this recipe.

How to do it…

The GUI method is described as follows:

  1. Using the QspatiaLite plugin (which is in the Database menu, if you've activated it) place the following in the query:

    SELECT *
    FROM census_wake2000 as a
    JOIN census_wake2000_pop as b
    ON a.stfid = b.stfid;
  2. From the Option dropdown, select the last choice, Create Spatial View & Load in QGIS, and set the Geometry field box value to the name of your geometry field from your spatial layer. In this example, this is...

You have been reading a chapter from
QGIS 2 Cookbook
Published in: Apr 2016
Publisher:
ISBN-13: 9781783984961
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