Questions tagged [qgis-modeler]

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

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Using filter expression in QGIS Modeler

Is there a way to load a saved filter expression (.qqf or .json) in QGIS Modeler and use it in the Feature filter?
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Use outputed layers directly in QGIS modeler

I'm tring to design a QGIS model in which I'm making iterations of the "join attributes by field value" algorithm (first image). However, I can't see how to directly use the output layer (...
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Modifying features in-place with a model

QGIS has some processing algorithms that allow modifying the layer's features in-place. How can I create a tool in the graphical modeler that allows for the same in-place editing functionality, e. g. ...
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In QGIS Modeler, how to merge the outputs of conditional branches of which some are performed and some are not?

I need to do a processing model that has several optional vector inputs, but that produces only one output. I have separate conditional processing branches for all inputs, but in the end I would need ...
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How do the two sets of parameters in the Coordinate Operation processing tool interact?

QGIS' modeler provides a "Coordinate Operation" processing tool as model input. One can use it to specify the exact coordinate operation a transformation/reprojection will use. The ...
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Using refFunctions with graphical modeler in QGIS

I'm trying to reproduce a sequence of actions i made in QGIS, but this time inside the modeler. In my process I need to collect in the lines layer the name of the polygon wich contains the line. For ...
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Qgis 3.22.6: Field calculator in model gives back null values [duplicate]

I'm trying to calculate distance between 2 points that were previously extracted by expression. The modell right now looks like this (the other processes are deactivated): The models input is point ...
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Merging multiple point layers with common fields to create single table in QGIS

I have seven point shapefiles at the same geographic location with three common fields ("ID", "name2", "name3") and a fourth field, ("uni_value") that is unique ...
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How to use raster calculator to sum multiple bands' value of a raster layer in QGIS Graphical Modeler?

I have 12 bands in a raster layer which I would like to sum up to produce a single layer. Interestingly, the raster calculator tool does the job while running it (QGIS interface)[ but fails to do so ...
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Using values from table in QGIS Modeler for filtering

I have a list of values (species names) in a .csv file and a vector layer of sightings of many species. Is there a way to load the list in the QGIS Modeler and use it to filter my vector layer so that ...
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Using LIKE in QGIS Graphical Modeler

I am using the Graphical Modeler in QGIS for the first time, and would like to filter a very large point layer of postcodes in the UK by the first letter of the postcode (for now 'B') before doing a '...
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QGIS Model Designer: 'Algorithm is not available' and 'NoneType' object has no attribute 'displayName'

I am building a model to automate a process of generating points at street intersections. When I run the model, there is no output. Checking the error logs, I see this: 2022-04-26T10:55:36 WARNING ...
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Selecting and changing fields in QGIS graphical modeler

I am trying to run a model that makes a selection from a refactored and name changed field, and changes the value of the selection. Refactoring is easy, as is making the selection within the renamed ...
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TIN interpolation in graphical modeler

I am creating a new script in graphical modeler. I have an input which is « vector field » as point. But when I use « TIN interpolation », I’m not able to select an « input of the model ». I can only ...
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QGIS Graphical Modeler PostgreSQL Execute and Load SQL

I have a QGIS graphical model workflow that I would like to be able to use with a connected PostGIS database. I am able to export the layers into the database and associated schema, but when I try ...
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How to share the set of models with other user?

I'm using QGIS LTR (3.22.5) and I'm working on set of models that automatize workflow in our company. The process is divided into different models, because in-between there are still some steps I can ...
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Set name for layer is not applied when it is loaded into QGIS window with modeler

I have added a script via the modeler. When executing the same code in the script, the layers are no longer added with the specified names in QGIS but with the name of tool that was automated. ...
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Using Point input for other algorithm in QGIS Graphical Modeler

I added a Model Input "Point Input" to my model. If I now launch the model from the Processing toolbox the user can click the ... icon and click on a point on the map. How can I use the ...
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QGIS processing modeler to PostGIS

I made a processing model in QGIS 3.10 where I calculated a integer value "mycolumn". Within the model, I refactored the "mycolumn" value to Boolean using mycolumn >= 1. As I ...
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Quick OSM in Process Modeler give different result than QuickOSM utlity

Quick OSM in the Process Modeller give different result than the same request on the main plugin I'm trying to download roads from Quick OSM in a process modeller, but when I try I'm sometimes getting ...
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Referring to column that is created in previous step using QGIS Modeler

In my model I use the regular points tool. The input for the regular points tool is a shapefile for the extent and for the point spacing I would like to use a value that was calculated in a previous ...
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Using algorithm outputs with raster calculator in QGIS model designer

I am using the Raster calculator in a model builder workflow (QGIS 3.16), but get a very unspecific error when using algorithm outputs as input for the raster calculator: An error occurred while ...
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Aligning rasters in QGIS modeler

I want to align several rasters during a QGIS modeler procedure (currently QGIS 3.16). In QGIS Desktop I can do this using the "Align rasters" tool given in the Raster submenu: In the ...
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Conditional branch and input

I'm building a script in the graphical modeler. I have different inputs that I have to give and one is optional. I'm trying to build a conditional branch that check the presence or absence of the ...
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Raster Calculator in Model Designer doesn't take my input number into account

I'm trying to make this model work : The formula in the Raster Calculator is like this : ('A'* @weightcesium )+('B' * @weightess1 ) + ( 'C' * @weightess2 )+ ( 'D' * @weightess3 ) However, the Raster ...
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QGIS 3.24.1: Raster Calculator returns error in Model Designer

I am trying to calculate a simple substraction between two rasters, after having reprojected one to be in the same CRS as the other. My model looks like this: I get the following in the log: QGIS ...
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GDAL merge within a QGIS model designer

I am attempting to include GDAL's merge but having difficulty with the "Additional creation options" field. I would like to include both COMPRESS=LZW and TILED=YES however I cannot seem to ...
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QGIS Plug-In doesn't work with exported Python script from Modeler

I am currently creating a QGIS 3.16/3.22 Plug-In. For this, I have created a model in QGIS Modeler and exported the Python script. I have changed it according to this Converting Model in Plug-in in ...
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4 votes
2 answers
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How to specify the output of the previous algorithm as input to the QGIS "Execute SQL"?

I am trying to use the SQL Execute in the graph modeler, receiving as input the output of another algorithm. The problem is that I couldn't specify that the "input" in the FROM of the SQL ...
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Import a Postgis raster into a QGIS graphical modeler

I'm creating a model using the Graphical Modeler on QGIS (version 3.16.16 - Hannover). I also have a PostGIS database, with the raster extension installed. In my model, I use the "Postgres SQL ...
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Join sub-catchment centroid using line and import attributes of it using QGIS Model builder

Input Data: I have a sub catchment polygon shapefile, which contain following details Name Description TG_ID Name of the Sub-catchment Hoehe Average height Slope Average slope UTM_x_m centroid x ...
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Modeler Vectorlayer input as expression for field calculator

I would like to build the expression of my INPUT from QGIS Modeler into a command of the field calculator. Something like overlay_intersects( 'INPUT WKA' ). Is that possible?
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Naming the output layer created by a QGIS 'Feature filter'

When using the 'Feature filter' within the Model Designer of QGIS (v. 3.16.10), if a filter is set to 'Final Output', the layer name is prefixed with 'OUTPUT_' e.g. if the Output Name of the filter is ...
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Atlas omits layers created in the Graphical Modeler when saving image files

I have QGIS version 3.16.11 The problem is that newly created layers (outputs from the Graphical Modeller) are not added to the layouts of the atlas. Creating an atlas (export Atlas as images) is of ...
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2 votes
1 answer
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How differentiate mixed input layers based on geometry

I'd like to know how can I differentiate mixed input layer, in the graphical modeler of QGIS, based on the geometry type (line, point, polygon). I used "multiple insert" -> "vector ...
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Purpose and format of Target Area Parameter in SAGA Upslope Area

I'm looking for the parameter description / purpose of the optional "Target Area" parameter in Upslope Area tool from SAGA GIS. Thought about the following options: Raster (what format?) ...
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Merge multiple raster from subsequent folders

I have 100 folders and in each folder, I have 50 dem tiffs. I want to merge the tiff from each folder and save it inside the master folder. I tried using Raster as an input in graphical modeler but it ...
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4 votes
1 answer
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Parameter autofill output name in batch processing doesn't match input layers name on QGIS

I'm using a model I've prepared on QGIS Graphical Modeler and I'm trying to batch processing this tool. I've noticed that compared to normal batch processing using any processing tool, the autofill ...
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Iterating over layer features when using ORS Isochrones in QGIS Model Designer?

While using the ORS Isochrones from layer-tool in QGIS there is a button next to the input layer that allows for iterating over each feature in the layer to ensure that the isochrones for each point ...
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1 vote
1 answer
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QGIS 3 Graphical Modeler: Create Calculated Field

I want to automate a workflow that includes the creation of a new field in a vector point layer. I want the new field to contain the distance between each point and the previous one, and the ...
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2 votes
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QGIS3.3 - Batch processing for getting $areas on multiple layers - errors

Hej! I try to calculate the area for several layers. I tried to use the batch processing tool (see img) through the Graphic Model processing tool but it gives me errors. Since I used the function $...
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Save entity as Excel Table using QGIS Modeler

I am using QGIS 3.16.6. I would like to save different attributes of my process in one Excel file and not in three different files as it is the case in the attached Model_2 screenshot (red box). I ...
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5 votes
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QGIS Graphical Modeler - How to query features in algorithm output?

I have a simple graphical model that uses a Field calculator to build a URL by concatenating strings in 3 fields of its input layer. This URL should be fed into the Download File algorithm using the ...
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Cell grid not aligning in QGIS when raster calculator is used in model

I am attempting create my first model to automate some of my workflow. However, when using the raster calculator, the output raster is not aligned with the input one despite being referenced to the ...
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Automate Leave One Out with QGIS Model Designer and Batch Processing

I am trying to automate leave one out idw interpolations without knowing python or r. I'm hoping to use either the built-in model designer or batch processing interfaces in QGIS (3.16) to do so. I ...
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1 vote
1 answer
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Putting coordinates of end point in shortest path algorithm

How do I put the coordinates (x,y) of the end point of the shortest path algorithm (from vector to point) which is part of a QGIS model? I'd like to get the calculated coordinates of a point (with the ...
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1 vote
1 answer
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Drop-down menu as an input in QGIS modeler

I'd like to know how I can put a drop-down menu as an input in the graphical modeler of QGIS. This drop-down input should allow to choice among the values of the specific field of a layer or values ...
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Bypassing Optional Layers for Series of Differences in Graphical Model

I am working on a graphical model which uses succeeding geoprocessing differences but some layers to subtract are optional, however each step subtracts more depending on the layer. Example iterative ...
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5 votes
1 answer
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Make modeler stop / raise exception when field doesn't exist

I have a model which use Field calculator: case when "A_FIELDNAME_THAT_DOESNT_EXIST"<=50 then 1 else 0 end The field doesn't exist, the output is 0 but the model keep executing ...
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Making model give last valid result

I want to make a model that gives me the features in a dataset that have the last actual value based om the attributes in the model. The dataset is struktures as there is not always a variable 3 and 4....
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