on February 18, 2023

What’s a good way to implement an ‘Attributes to keep’ option in a QGIS processing script?

Geographic Information Systems

How to write a script for QGIS?

Within QGIS, you can use Create new script in the Scripts menu at the top of the Processing Toolbox to open the Processing Script Editor where you can write your code. To simplify the task, you can start with a script template by using Create new script from template from the same menu.

How do I enable processing in QGIS?

The processing framework is a core QGIS plugin, which means that it should already be installed in your system, since it is included with QGIS. In case it is active, you should see a menu called Processing in your menu bar. There you can access all the framework components.

How do I add a processing toolbox in QGIS?

The QGIS Processing Toolbox

  1. As a first step, add two input parameters to the model, by drag-and-dropping them onto the empty canvas: a Vector Layer named Input Layer and a String called Genus .
  2. Then, add a Select by attribute algorithm, and set its input layer to refer to our Input Layer variable.

What is processing toolbox in QGIS?

The Processing Toolbox is the main element of the processing GUI, and the one that you are more likely to use in your daily work. It shows the list of all available algorithms grouped in different blocks called Providers, and custom models and scripts you can add to extend the set of tools.

What programming language does QGIS use?

C++

QGIS itself is written in C++, so it makes sense to write plugins in C++ as well. It is an object- oriented programming (OOP) language that is prefered by many developers for creating large-scale applications.

How do I change the processing settings in QGIS?

The Processing Options menu (Settings► Options ► Processing tab) allows you to configure how algorithms work. Configuration parameters are structured in separate blocks that you can select on the left-hand side of the dialog.

Where is the geoprocessing tool in QGIS?

This section will focus on geoprocessing tools that use vector data layers as inputs to produce derived outputs. The geoprocessing tools are part of the fTools plugin, which is automatically installed with QGIS and enabled by default. The tools can be found in the Geoprocessing Tools menu under Vector.

How do I enable plugins in QGIS?

Plugin installation

  1. Open QGIS on your computer.
  2. Select Manage and Install Plugins… in the Plugins tab:
  3. Find the Mergin Maps plugin and click Install Plugin:
  4. Close the Plugins dialog. The plugin toolbar should appear in QGIS: TIP. If you cannot see the toolbar, ensure Toolbar is checked under View > Toolbars.


How to automate QGIS with Python?

What you’ll learn



  1. Using the QGIS Python console.
  2. Using the QGIS Python editor.
  3. Using PyQGIS to manipuate the QGIS interface.
  4. Using PyQGIS to manipulate a layers symbology.
  5. Using PyQGIS to manipulate a layers attributes.
  6. Using PyQGIS to manipulate a layers geometry.
  7. Using PyQGIS to perform spatial operations.

Is QGIS built on Python?

QGIS Comes with a built-in Python Console and a code editor where you can write and run Python code. Go to Plugins → Python Console to open the console.

How do I write SQL in QGIS?

Quote from video: Use the DB manager to connect to your database. And start a SQL window.