2.3. Linux Debian/Ubuntu

2.3.1. QGIS download and installation

This guide describes the installation for Debian/Ubuntu Linux. For other Linux distributions please follow Cross-platform installation using Conda.

  • Open a terminal and type:

sudo apt-get update

  • Press Enter and type the user password;

  • Type in a terminal:

sudo apt-get install qgis python3-matplotlib python3-scipy

  • Press Enter and wait until the software is downloaded and installed.

Now, QGIS is installed.

_images/QGIS.jpg

2.3.2. Installation of required dependencies

The Semi-Automatic Classification Plugin requires Remotior Sensus, GDAL, NumPy and SciPy for most functionalities. Optionally, scikit-learn and PyTorch are required for machine learning.

Therefore, we need to install the dependencies that are not included in the QGIS installation.

  • Close QGIS;

  • Open the terminal (administrative rights may be required);

  • Enter the following command:

pip3 install --upgrade remotior-sensus

or optionally:

pip3 install --upgrade remotior-sensus scikit-learn torch

Warning

In case you get an error message related to externally managed environment, you may use (at the risk of breaking the OS or the Python installation) the option --break-system-packages; alternatively, it is possible to create a virtual environment python3 -m venv env, install the packages in it, and start QGIS from the activated environment.

Follow the same procedure for updating the dependencies.

Tip

In case of installation issues, one may follow the Alternative installation of plugin dependencies.

2.3.3. Semi-Automatic Classification Plugin installation

  • Run QGIS;

  • From the main menu, select Plugins > Manage and Install Plugins;

_images/install.jpg

  • From the menu All, select the Semi-Automatic Classification Plugin and click the button Install plugin;

_images/plugins.jpg

  • The SCP should be automatically activated; however, be sure that the Semi-Automatic Classification Plugin is checked in the menu Installed (the restart of QGIS could be necessary to complete the SCP installation);

_images/plugins_installed.jpg

2.3.4. Configuration of the plugin

Now, the Semi-Automatic Classification Plugin is installed and a dock and a toolbar should be added to QGIS. Also, a SCP menu is available in the Menu Bar of QGIS. It is possible to move the toolbar and the dock according to your needs, as in the following image.

_images/SemiAutomaticClassificationPlugin.jpg

The configuration of available RAM is recommended in order to reduce the processing time. From the SCP menu select settings_tool Settings > Processing .

_images/settings_processing.jpg

In the Settings, set the Available RAM (MB) to a value that should be half of the system RAM. For instance, if your system has 2GB of RAM, set the value to 1024MB.

_images/settings_processing_tab.png

2.3.5. Update of required dependencies

The dependency Remotior Sensus is frequently updated. The Semi-Automatic Classification Plugin can check automatically if a new version is available, and display a message in the SCP dock.

_images/remotior_sensus_update.png

It is recommended to close QGIS and update Remotior Sensus following the same installation steps described in Installation of required dependencies .