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Learning QGIS, Third Edition

You're reading from   Learning QGIS, Third Edition Create great maps and perform geoprocessing tasks with ease

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Product type Paperback
Published in Mar 2016
Publisher Packt
ISBN-13 9781785880339
Length 210 pages
Edition 3rd Edition
Tools
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Author (1):
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Anita Graser Anita Graser
Author Profile Icon Anita Graser
Anita Graser
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Toc

Labeling


We can activate labeling by going to Layer Properties | Labels, selecting Show labels for this layer, and selecting the attribute field that we want to Label with. This is all we need to do to display labels with default settings. While default labels are great for a quick preview, we will usually want to customize labels if we create visualizations for reports or standalone maps.

Using Expressions (the button that is right beside the attribute drop-down list), we can format the label text to suit our needs. For example, the NAME field in our sample airports.shp file contains text in uppercase. To display the airport names in mixed case instead, we can set the title(NAME) expression, which will reformat the name text in title case. We can also use multiple fields to create a label, for example, combining the name and elevation in brackets using the concatenation operator (||), as follows:

title(NAME) || ' (' || "ELEV" || ')'

Note the use of simple quotation marks around text, such...

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