Introductie¶

Dit hoofdstuk introduceert het QGIS framework voor Processing, een omgeving voor geo-processing die kan worden gebruikt om eigen en algoritmen van derde partijen aan te roepen vanuit QGIS, wat uw taken voor ruimtelijke analyses meer productief en eenvoudig uit te voeren maakt.

In de volgende gedeelten zullen we bekijken hoe de grafische elementen van dit framework gebruikt kunnen worden en het meeste uit elk van hen te halen.

There are four basic elements in the framework GUI, which are used to run algorithms for different purposes. Choosing one tool or another will depend on the kind of analysis that is to be performed and the particular characteristics of each user and project. All of them (except for the batch processing interface, which is called from the toolbox or the algorithm execution dialog, as we will see) can be accessed from the Processing menu item. (You will see more than four entries. The remaining ones are not used to execute algorithms and will be explained later in this chapter).

• The Toolbox. The main element of the GUI, it is used to execute a single algorithm or run a batch process based on that algorithm.

Processing - Toolbox

• The Graphical modeler. Several algorithms can be combined graphically using the modeler to define a workflow, creating a single process that involves several subprocesses.

Processing - Grafische modellen bouwen

• The History manager. All actions performed using any of the aforementioned elements are stored in a history file and can be later easily reproduced using the history manager.

Processing - Geschiedenis

• The Batch processing interface. This interface allows you to execute batch processes and automate the execution of a single algorithm on multiple datasets.

Processing - Interface voor verwerken in batch

In de volgende gedeelten zullen we tot in detail elk van deze elementen nader bekijken.