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macOS

QGIS download and installation

  • Download the latest QGIS version from here ;
  • Execute the QGIS installer with administrative rights, accepting the default configuration.

Now, QGIS is installed.

_static/installation/QGIS.jpg

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);
  • Type the following command (you may need to adapt the path /Applications/QGIS.app to the actual QGIS installation directory):
/Applications/QGIS.app/Contents/MacOS/bin/pip3 install scikit-learn scipy torch torchvision --index-url https://download.pytorch.org/whl/cpu

or in case you installed QGIS LTR:

/Applications/QGIS-LTR.app/Contents/MacOS/bin/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/

Semi-Automatic Classification Plugin installation

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

_static/installation/install.jpg

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

_static/installation/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);

_static/installation/plugins_installed.jpg

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.

_static/installation/SemiAutomaticClassificationPlugin.jpg

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

_static/interface/scp_menu_simplified.png

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.