QGIS Plugins

14 Jul 2017 ᛫ 3 min read

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QGIS Plugins

QGIS has an extensive plugin library but it’s commonly underutilized by those unfamiliar or new to QGIS. I’ve had experiences where people told me that they don’t use QGIS because it doesn’t have function X and they always get surprised when I tell them that QGIS actually has the function they’re looking for as a plugin.

For the latest LTR (2.18.10), there are currently more than 700 plugins available on the QGIS Official Plugin repository that users can download (and improve upon) whose functions range from the simple to the complex to the mundane.

Manage and Install Plugins

There are two ways to install plugins in QGIS. The first is by putting the source code in your computer’s QGIS plugin directory.

For WINDOWS: this is usually found in**C:\Users<your username>.qgis(2)\python\plugins```

For LINUX/MAC: it is usually in**~/.qgis2/python/plugins/```

A function is currently being developed for the upcoming QGIS 3.0 release that will allow you to install plugins from zip files.

The second option is by downloading the plugin from a plugin repository (i.e. The QGIS Official Plugin Repository) using theManage and Install Plugins Dialog``` which can be accessed via **Plugins -> Manage and Install Plugins … in the Main Menu bar.

QGIS Manage and Install Plugins in the menu bar
QGIS Manage and Install Plugins Dialog

The*Manage and Install Plugins Dialogconnects to the QGIS Official Plugin repository (or any repository that you indicate in the**Settings Tab) to fetch plugins available for your version of QGIS. It has 4 Tabs: **All Tab-- shows ALL the plugins available for your QGIS version including those that are already installed on your machine. ***Installed Tab – shows only the plugins installed on your machine. ***Not installed Tab-- shows the plugins that are not installed on your machine. ***Settings Tab – gives you options on when to check for plugin updates, whether or not to include experimental and deprecated plugins, or add/change the repository to fetch plugins from.

Some plugins come bundled with your QGIS version. These are called Core plugins. You don’t need to download these plugins but merely activate them in theManage and Install Plugins Dialog```. One such plugin is the **Spatial Query Plugin.

To install this plugin, type Spatial Query in the search bar while on the**Allor**Installed tab and select the plugin. To activate/deactivate it, tick the check-box on the left of the plugin name.

Install QGIS Spatial Query plugin

If you successfully activated the plugin, you should be able to access it via Vector -> Spatial Query -> Spatial Query

QGIS Spatial Query Plugin in the menu bar

The plugins that are not part of the Core plugins can also be downloaded and installed from theManage and Install Plugins Dialog. These **External** plugins are fetched from the plugin repositories indicated in the**Settings tab. For example, you can install the **Statist plugin which calculates statistics for a field by searching for Statist in the search bar while on theAllor**Not istalled tab then clicking theInstall plugin``` button on the lower right corner of the dialog.

Install Statist plugin QGIS

If you successfully installed the plugin, you should be able to access it via Vector -> Statist -> Statist

Statis plugin in QGIS menu bar

Making your own plugin

Now what if there’s no plugin that does what you want? Well, you can always make one yourself!

The Plugin Builder is a plugin that creates a template that can serve as the starting point for QGIS plugin development so you won’t have to create one from scratch. You can install it from the**Manage and Install Plugins Dialog```.

Of course, you can always create a plugin from scratch. If you are interested in creating your own plugin, you can check the Official QGIS documentation. For Python plugins, it’s a good idea to check out the PyQGIS Developer Cookbook.

Now that you know about QGIS Plugins, don’t be afraid to download and try them so that you can fully utilize the power of QGIS. You can even create your own and share it with the community.

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BNHR

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