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Questions tagged [qgis-modeler]

An application of QGIS used to develop models utilizing a large variety of powerful Geoprocessing tools via a GUI.

A model is a sequential set of Geoprocessing tools used to perform various analysis. The output of one tool can be used as an input for another. All this is done via a GUI, removing the need for the user to write any code. This is perfect for new and old users of QGIS to simply select the required algorithms from a list.

Note: "SEXTANTE" has been replaced with "Processing".

Reference: SEXTANTE Spatial Data Processing Framework

[1]. http://sextantegis.com/

[2]. http://www.digital-geography.com/qgis-plugins-sextante/#.VAWhk2M0_al

784 questions
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Defining the geometric predicate as a dropdown-input of a model

I built a model and use the tool "Extract by location". I would like to define the geometric predicate as a variable, so the user can choose between different predicates when he/she runs the model. How can I do that?
Enzo Baldini
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Using raster calculator inside graphical modeler

I have an issue, which I am struggling with since few hours - I've built a model which aims to make multicriterial analysis based on few vector layers and DEM. At the step which is problematic for me I have 5 reclassified rasters and they are fine…
BreadFish
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Selected features checkbox in graphical modeler

I'd like to know how can i add the checkbox of the selected features in the input layer of the Graphical Modeler of QGIS. Is it available this feature? For example, like this checkbox of a classical qgis geoprocessing: Any suggestions?
Mark
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Changing inputs in QGIS modeler

I'm new to using the modeler function in QGIS. I'm trying to follow the tutorial in the screenshot. But when I follow the steps it ends up with my in/out algorithm not connected to the "counties layer/county name attribute" input with arrows. How…
DanG
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QGIS 3 modeler: how to use the fields of an intermediate output as input in another algorithm?

I'm working on a model to calculate land uses (usos) in different areas (zonas): I have corrected geometries, cutted the uses layer, corrected geometries again and used the fields calculator to assing the area ID to every uses polygon contained in…
jpinilla
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Calling a plugin in QGIS Graphical Modeler

I am familiar with Arcmap modelbuilder but struggling with QGIS equivalent. I have installed plugin 'UMEP' and need to run 'sky view factor' module on series of rasters. Inside the Graphical modeler, I can only see modules which were by installed by…
Martan
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Working with R and QGIS

I am performing an interpolation in R but i get the following results. What could be the issue? The script ##MySript=group ##rainfall= vector ##output= output raster require(sp) require(rgdal) rainfall slotNames(rainfall) …
Eric Wamiti
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QGIS 3.16.4: Graphical modeler not running

Does anyone know the error that a graphical model can not be run at all? Following procedure: Go to "Browser" in QGIS. Execute *.model3. Do the necessary stuff like input file and output file. Click on "Run". There is no error, nothing in "Log"…
Mona
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Expressions to Find data using QGIS Modeler

Im new to the expressions within the model builder. I have built a model already using two points as a Station And Backsight, with a line between them. Also my model computes a length of the line and its azimuth, (both are in their own fields). I…
Scones
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QGIS modelbuilder, having a choicebox/value map of strings as string input

I was wondering how you can get a choicebox/value map in the string input? Right now we have to type in value in but we would like to have it that has a choicebox/listbox to save time with typing.
ThunderSpark
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Running an algorithm based on a condition

In QGIS 3.10, is it possible to only run an algorithm in the processing modeler if certain conditions are true? I'm applying concave hull to a layer, but sometimes that layer is empty and the model throws an error, so it should only run the concave…
bovsorrr
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QGIS Modeler - drag and drop data from ToC

Is it possible to drag and drop data from the ToC to a graphical modeler and then draw connections between data and algorithms? Also can we do the same with items in the history panel? This would speed up the process of creating a model.
GeorgeC
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