installation_debian.rst

Linux Debian/Ubuntu

QGIS download and installation

It is recomended to follow the QGIS guide .

For other Linux distributions please follow QGIS Linux or :ref:`installation_conda`.

This guide describes the installation for Debian/Ubuntu Linux.

• 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

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

Now, QGIS is installed.

Installation of required dependencies

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

The Semi-Automatic Classification Plugin can automatically download and install Remotior Sensus. Therefore, it is recommended 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 scikit-learn scipy torch torchvision --index-url https://download.pytorch.org/whl/cpu

Tip

If the system has GPU support please refer to the PyTorch documentation for installation https://pytorch.org/get-started/locally/

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.

Semi-Automatic Classification Plugin installation

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

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

• 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);

Configuration of the plugin

Now, the Semi-Automatic Classification Plugin is installed.

A :guilabel:`Simplified interface` is loaded after the first installation of the plugin. It is especially designed for new users in order to ease the classification process, from the definition of input images to executing the classification algorithm. Also, a SCP menu is available in the Menu Bar of QGIS. It is possible to move the dock according to your needs, as in the following image.

The configuration of available RAM is recommended in order to reduce the processing time. From the :ref:`SCP_menu` select Settings .

In the :ref:`settings_tab`, set the Available RAM (MB) to a value that should be half of the system RAM. For instance, if your system has 4GB of RAM, set the value to 2048MB.

The :guilabel:`Complete interface` can be loaded from the settings in the :ref:`SCP_menu`, by deselecting :guilabel:`Simplified interface` and restarting QGIS.