5. Making custom scripts with additional functionality

One of the reasons QGIS is considered more advanced, is because you will quickly get into making your own scripts to extend the functionality. We also have to do that some times in the practical. There, the scripts were provided. However, if you want to do some more advanced things yourself, it is very useful to know a little bit how to make your own scripts.

The basic structure in this manual for creating a script is the same:

1. Create a model with the graphic modeler with as many parameters already loaded

2. Export the model to a Python script

3. Add parameters (inputs/outputs) that could not be added in the graphical modeler

4. convert the parameters to actual things that we can work with (such as numbers (int/float) or text (string))

5. perform the calculations/processing with the parameters/algorithms

6. maybe some post-processing to properly name outputs.

• 5.1. Follow Along: Creating a script for the mask file
  • 5.1.1. Creating a model
  • 5.1.2. Add additional parameters
  • 5.1.3. Convert parameters to workable format
  • 5.1.4. Perform calculations
  • 5.1.5. Testing the annulus mask
• 5.2. Follow Along: Making a script for rasterizing like
  • 5.2.1. Creating a model and save as Python
  • 5.2.2. Inspecting the resulting Python script
  • 5.2.3. Convert parameters to workable format
  • 5.2.4. Modifying the algorithm
  • 5.2.5. Testing
• 5.3. Follow Along: Making a script for batch rasterizing
  • 5.3.1. Just make it work
  • 5.3.2. Temporary outputs and feedback
  • 5.3.3. Load layers into QGIS
  • 5.3.4. Make loading layers optional