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Questions tagged [qgis-processing]

Spatial data processing framework that brings advanced analysis capabilities to QGIS.

The Processing Toolbox is activable from Processing > Toolbox. It contains all the available algorithms, divided into predefined groups:

  • QGIS geoalgorithms;
  • GDAL/OGR;
  • GRASS GIS7;
  • Models;
  • Orfeo Toolbox (Image analysis);
  • R scripts;
  • SAGA;
  • Scripts;
  • TauDEM (hydrologic analysis);
  • Tools for LiDAR data.

Some of these groups represent algorithms from third-party applications, while others contain algorithms directly coded as part of the processing plugin, not relying on any additional software.

1625 questions
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How to provide GDAL algorithms that require multiple layer input in the graphical modeler?

Some GDAL algorithms such as gdalbuildvrt or gdalmerge require the selection of input layers. How to make an entry in a graphical model from a list provided by the processing flow?
FERRATON
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Using V.net.connect on QGIS 2.18.13

I'm trying to use the grass algorithm v.net.connect via the processing menu using a test set of 3 point objects and a single line object. All 4 objects only have geometry and an ID field. With the parameters set to these two layers and the threshold…
K. Osborne
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Join Attributes by Location incorrect summary attributes in joined table

I am using QGIS 2.18.3 to join points to polygons with a Precision setting of 20.0 to select any polygon within radius of my point. I am taking attribute of intersecting features with the point layer as the target. The resulting joined layer…
Geoff Phillips
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Finding spatial difference between two vector layers with multiple features in each layer using QGIS

I am learning on the job with QGIS. I have two state level vector layers with individual shapes for each county inside the state boundary. I am trying to identify the area differences between each county within the state layer between the two files.…
oisin78
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Combine in QGIS from NDVI - ERROR 1

I am trying to make a Stack in QGIS from the NDVI of several Landsat 8 images. But the following error appears. How can I solve it?
Marianela
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How to Map Multiple Point to Destination Via Road Network and Represent Proportianally

So I've been searching a lot and have found bits of information but no way to doing it from start to finish. I have the following info: .csv data of all the locations (Name,ID,latitude and longitude) (800 locations) .csv data for the journeys taken…
Ashley Rabot
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Missing refactor fields in QGIS 2.18.13

I have installed QGIS 2.18.13 "Las Palmas" and I wanted to edit a table using refactor fields. I search the item using Processing toolbox/Geoalgorithms/Vector/Table tools, and the refactor fields is missing. Can anyone help me with this?
Dinarte Teixeira
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Qgis 2.18 unknown Error when Extract by location

I hope somebody can help me. At first I have merge some vectorlayers (lineshape) without problems. Then I've create a bounding box with "polygon from layer extend" (polygon-shape) without problems too. And then when I tried to "extract by location",…
user100002
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Processing script error QGIS point in polygon

In QGIS version 2.18.2 i get the following whilst trying to execute Vector > Analysis tools > Count point in polygon. Any clues as to how to troubleshoot? Uncaught error while executing algorithm Traceback (most recent call last): …
mapping dom
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Enmapbox Spatial Prewitt Filter

I want to create a magnetic first vertical derivative raster from a csv file containing z=magnetic total field, x= easting, y= northing. I am told Enmapbox/ Spatial Prewitt filter will do this and I have tried but cant get the boxes filled…
BJCotton
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Error running SAGA NextGen plugin's "Points to lines" tool

I am using QGIS 3.30.1 and am attempting to use the SAGA NextGen plugin to access SAGA processing algorithms, in particular the "convert points to lines" tool. I am using SAGA 7.3.0 installed from Linux Mint repositories. I am getting the following…
David O'Toole
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CSV location code decoder

Is the a way reverse a CSV cell code that was generated from PyQGIS? This is for a location point. The code is 0101000020E6100000C5DC58CD04F65BC0CC755D611AB54040
Nathan N.
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Creating a DTM from a LiDAR map in QGIS 3.22.7

I'd like to create a DTM from a LiDAR map in QGIS 3.22.7 I looked at a tutorial that explains how to do it, but it seems as if the instructions there refer to a different version of QGIS because I can't find where to include the LAStools library as…
Antonio
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Why vector tools cannot appear in QGIS data processing

Why vector tools cannot appear in QGIS data processing
dickysetiawan
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In QGIS processing modeller, how to use an input number in an expression?

I'm making a model where I need to use a certain years in a bunch of expressions. For example: ""era_2" > YEAR1" "era_2" > YEAR2 AND "era_2" < YEAR1 "era_2" >= YEAR3 AND "ERA_2" <= YEAR1 It's confusing at the moment for other people using the…
joseph
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