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QGIS By Example

You're reading from   QGIS By Example Leverage the power of QGIS in real-world applications to become a powerful user in cartography and GIS analysis

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781782174677
Length 316 pages
Edition 1st Edition
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Table of Contents (12) Chapters Close

Preface 1. Handling Your Data FREE CHAPTER 2. Visualizing and Styling the Data 3. Presenting Data on a Print Map 4. Publishing the Map Online 5. Answering Questions with Density Analysis 6. Answering Questions with Visibility Analysis 7. Answering Questions with Suitability Analysis 8. Automating Analysis with Processing Models 9. Automating Analysis with Processing Scripts 10. Developing a Python Plugin – Select by Radius Index

Loading layers from the spatial database

Throughout this chapter, we will use the database that we created earlier. As you remember, this is a SpatiaLite file database. In order to work with it, we must first establish a connection and then load the data. As always, there are a few alternative ways of doing this in QGIS:

  • From the menu, go to Layer | Add Layer | Add SpatiaLite Layer
  • Click on Loading layers from the spatial database, the Add SpatiaLite Layer button, in the Manage Layers toolbar
  • Use the Ctrl + Shift + L keyboard shortcut

In the opened window, define the database you want to connect to by following these steps:

  1. If you have created the database as was described in the previous chapter, you are likely to notice that it has already been connected. If it is not, then click on the New button and navigate to the .sqlite file you want to work with.
  2. After the database file is selected, click on the Connect button to see the list of available layers. You will see the layers' names and geometry types.
  3. Select the necessary...
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