Questions tagged [graphical-modeller]
The graphical-modeller tag has no usage guidance.
26
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Convert a model to a plugin
I have a complex model that I want to convert into a plugin. The model includes multiple tools (shared polygon edges, Dissolve, Buffer, Retain, Refactor and merging vector layers) with dependencies ...
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QGIS Modeller: Use project variable (@project_folder) as default value for file/folder input
To save users having to always navigate long/complex folders to set a path/geopackage storing the output of a tool, is it possible to set the default value of a File/Folder input parameter to be the ...
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29
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Graphical modeler: QGIS Field calculator don't consider real value of the attribute layer
I'm trying to create a tool with graphical modeler of QGIS where I add a new attribute which represents length of the line divided by an certain number of interval informed in his attribute table.
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48
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Condional Branch QGIS
I'm trying to figure out how the Conditional Branch tool works. I looked at many cases from the Internet, but did not figure out how to solve my problem. For example, I made a simple model. I have a ...
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QGIS Naming Model Outputs using attribute from input layer
This is the first QGIS Process Model I have ever attempted to build (and I am still on a learning curve with QGIS generally) please excuse my inevitable ignorance. I would be most grateful for some ...
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54
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Extract by expression in the graphical modeller in QGIS [closed]
Using the graphical modeller (QGIS 3.22.14), I'm implementing the procedure described here: Determining the direction of polygons? to determine the orientation of polygons in a vector layer. I'm ...
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35
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QGIS Modeller- Field Calculator on intermediate step fails to find field
As part of my model I union a bunch of PostGIS layers (views), each containing the same 'feature' field (char(64)). After the union, there are a numerous feature_2, feature_3 etc etc fields in the ...
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Join attributes by field value doesn't work in the graphical modeler, but works from processing toolbox
I have been trying to join two fields with id's together. Most of the id's are the same, but some are in one field and not in the other, and the otherway around. I need to join the two fields to see ...
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Batch Process/Single Process-QGIS Model Designer/Graphical Modeler [Raster]
Regards
I need to process one or more raster layers with Model Designer QGIS. How do I connect the raster layer to folder parameters? or connect algorithms to the whole folder.
QGIS version
3.22.11-...
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71
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Extracting field value in QGIS graphical model | upslope area
How to extract latitude and longitude from a point shape file and feed into an algorithm within a single graphical model.
In QGIS graphical model, I need to execute 'upslope area' algorithm for which ...
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Loading xyz-tiles using QGIS modeler
A background map can be imported into QGIS by e.g. adding a new xyz-tile connection. Example of a working connection (satellite data from Google): http://mt0.google.com/vt/lyrs=s&hl=en&x={x}&...
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158
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Extract by Expression in QGIS Graphical Modeler
QGIS version 3.16.16-Hannover
OS Version Linux Mint 19.3
So I am trying to run a simple Extract by location algorithm in the graphical modeler
I have as Input a polygon file with a field call ...
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18
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TIN Interpolation Algorithm does not work in Graphical Modeler
I see that this question has been asked a number of times already but there has been 0 response to those questions. The TIN Interpolation Algorithm does not work in the Graphical Modeler as it does ...
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68
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QGIS Modeller: Overwrite existing file
When using the QGIS Graphical Modeller for automatic workflows, is there a way to overwrite existing files and, even better, overwriting existing files currently loaded as layer in QGIS?
Just to ...
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60
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Location allocation with a maximum occupancy and distance
I am working on a project where students can be assigned to multiple schools. I have the location assignment with the plugin QNEAT3 and the OD Matrix. In this was calculated from each school the path ...
user208744
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Variable only updated in second run even with dependency using Graphical Modeler
I try to use variables for expressions in selecting features etc. I set the variable and also add a dependency in the following block. The protocol of the run also shows that the variable is set ...
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76
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QGIS Set Project variable in Graphical Modeller
I am trying to update a project variable using the graphical modeller.
I am using the set project variable algorithm which runs fine but the behaviour is not as expected. Rather than updating the ...
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97
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Loading all vector layers which are in different folders
How can I load, with the graphical modeler of QGIS, all point layers in one shot (called in the same way 'a') which are in different folders, and all linear layers (called in the same way 'b') also ...
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64
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Graphical Modeler location of saved models
Is there any way to change the default location of the saved models in Graphical Modeler? (QGIS 3.16)
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92
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QGIS Graphical Modeler - Using field calculator to add values to point grid
Using the QGIS Graphical Modeler, I'm trying to add values from a raster previously generated in the same model to a point grid generated in the same model as well. I know I can do it using another ...
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191
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Batch increase drone imagery altitude by editing EXIF GPS information
I have around 3.600 drone images covering an area of around 2 x 4 KMs. The images were recorded using two drones. For some reason the images from one of the drones is off by around 15 meters in the z-...
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53
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How to drop field from algorithm output in QGIS graphical modeler (drop fields does not work)
I have built a process in the graphical modeler which uses several temporary outputs. The resulting CSV is fine but it contains an unneccessary field from the HubDistance algorithm (HubName). I'd like ...
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107
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Is it possible to use a WFS layer as input on the QGIS Model Designer?
I've recently learned that I can get open data on QGIS by using WFS services.
Well, as it is these WFS services are very useful since the data is already in a vectorized way. However, I'd like to ...
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225
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Drop multiple fields in graphic modeller qgis 3.10.14 not working
I am trying to use the graphical modeler to delete multiple fields in QGIS 3.10.14.
When i try to use the Drop Fields algorithm to delete multiple fields from the required layer, it deletes only the ...
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134
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Saving multiple raster sums to one Excel file on QGIS
I have a couple hundred raster files that I want to find the sum for in order to perform some further calculation. I want to have the sum of each raster file placed in one Excel sheet.
I used to work ...
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295
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How to loop through multiple layers in a GeoPackage using QGIS Graphical Modeller
I have 1,366 districts each of which has up to 300 sub-districts. These are all held in a GeoPackage, but each district is a separate layer.
What I need to do next is to iterate through each layer and ...
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