Lesson 7 Overview
=================

.. figure:: img/L7-01-overview-01-pyqgis.svg
    :width: 500 px


This week we will take a quick tour on **how to use Python in QGIS** using the `processing <http://docs.qgis.org/3.4/en/docs/user_manual/processing/index.html>`_ framework.

Until 2016, this course taught the use of the `arcpy <http://desktop.arcgis.com/en/arcmap/10.3/analyze/arcpy/what-is-arcpy-.htm>`_ module within ArcGIS. Since ArcGIS is a Desktop GIS widely used throughout the private and public sector, feel free to revisit `the 2016 course’s Lesson 6 <https://automating-gis-processes.github.io/2016/Lesson6-overview.html>`_.

Learning objectives
-------------------

We **don't** have any exercise for this week. The aim of this week is to learn the basics of how QGIS tools and algorithms can be run using *processing* functions, and how custom scripts can be retrofitted with a graphical user interface. In this week’s lesson we will create a QGIS Python tool step by step that **converts the individual *Damselfish species distribution polygons* into raster layers** (``.tif``).

After this week’s lesson you should be able to:

 - Create a simple user interface for a script in the QGIS Processing Toolbox.

 - Run different QGIS algorithms from Python.

 - Find and know how to read the PyQGIS and QGIS Processing documentation online.

The data we use this week is the same that we used already during the `second week <../../notebooks/L2/geopandas-basics.html>`_:

.. figure:: img/L7-01-overview-02-damselfish-simplemap.png

Lecture videos
--------------

.. admonition:: Lesson 7.1 - Introduction to Python in QGIS; Processing toolbox; Graphical modeller

    .. raw:: html

        <!--// <iframe width="560" height="315" src="https://www.youtube.com/embed/D1IbJNV_Cp4?start=1" frameborder="0" allowfullscreen></iframe>
        <p>Christoph Fink / Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCGrJqJjVHGDV5l0XijSAN1Q/playlists">@ AutoGIS channel on Youtube</a>.</p> //-->


.. admonition:: Lesson 7.2 - Python scripting in QGIS 3.4; Creating a processing toolbox with custom Python scripts;

    .. raw:: html

        <!--// <iframe width="560" height="315" src="https://www.youtube.com/embed/-tnqzIyUDLs?start=1" frameborder="0" allowfullscreen></iframe>
        <p>Christoph Fink / Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCGrJqJjVHGDV5l0XijSAN1Q/playlists">@ AutoGIS channel on Youtube</a>.</p> //-->