Questions tagged [saga]

SAGA (System for Automated Geoscientific Analyses) is a GIS toolbox with many modules that can be used from the GUI, command line or accessed through R,python or directly using C++.

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Python error when opening QGIS

I am getting this message when opening QGIS 3.22.11: Python error: Couldn't load plugin 'sagaprovider' due to an error when calling its classFactory() method See message log (Python Error) for more ...
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27 views

QGIS use a reference layer for IDW interpolation

I am using QGIS SAGA IDW Interpolation tool to interpolate my single-beam data which contains gaps. I was just wondering is it possible to use a reference layer to help with more 'accurate' ...
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Seeking Kriging Interpolation tool for Python

I have been using ESRI ArcGIS Pro's 3D Analyst Geoprocessing Tool Kriging to interpolate my data. More specifically, I have been using the Ordinary Kriging with a cell size of 0.5 on 36935 xyz points ...
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Why does the SAGA Wang & Liu fill sinks algorithm decrease elevation values of my original DEM?

I used the SAGA Wang & Liu fill sinks algorithm to create a depressionless DEM. Apart from filling depressions however, the output also generates decreased DEM values of the original dataset. The ...
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Decision tree table format for SAGA's Decision Tree Classification

I'm trying to use SAGA's Decision Tree Classification tool to classify pixels based on 4 raster inputs and previously set thresholds. I'm basing myself on a decision table available in a scientific ...
2 votes
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29 views

Difference between Heatmap in QGIS and Kernel Density in SAGA

I'm trying to migrate my workflow from QGIS to SAGA so that I can automate it from the command line or a standalone Python script. Part of the workflow is running a KDE (or rather, a series of KDEs). ...
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21 views

Delineate morphometric features in SAGA GIS 7.8.2

I have been trying to delineate morphometric features such as peak, ridge, channel, pass etc. I used the tool ' Terrain analysis-morphometry-morphometric feature' on ALOS PALSAR DEM of spatial ...
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SAGA tool to fill sinks

I am still relatively new to the GIS field. I was using a DEM analysis for catchment delineation but could not use the SAGA fill sink tool. This is what it displays: SAGA version 7.8.2 is not ...
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Limiting saga_cmd memory usage

I'm trying to perform a shrink operation on a large (13GB LZW compressed) raster in SAGA GIS on Linux: saga_cmd grid_tools 28 -INPUT in.tif -RESULT out.tif -OPERATION 0 -RADIUS 5 I have 64GB of RAM +...
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Change channelnetwork for watershed basins

Currently working with QGIS 3.16 and the SAGA toolbox. I want to change the flowlines from the channelnetwork (created from channelnetwork saga tool) to fit to the lokals drainage network. Is it ...
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Using topographic openness with SAGA Next gen plugin in QGIS

When using the Topographic Openness algorithm from SAGA Next Gen it does not allow me to export the layers. I have seen some solutions that suggest me to activate the module in providers in the ...
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3 votes
2 answers
156 views

Incremented index on a split polyline in QGIS

I would like to use a function like SAGA LINE-POLYGON INTERSECTION in QGIS, that splits a polyline into several polylines at every intersection of another layer of polygons. I would like the polylines ...
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Error with no output result while using SAGA Upslope on QGIS to determine Catchment area

I have been trying to create a catchment area using upslope area under SAGA in QGIS, and i keep getting this as an error message. i would love to know how to fix it. The following layers were not ...
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10 views

TPI based landform doesn't work on MAC OSX

I have been trying to run the SAGA tool 'TPI based landform' but it won't run at all. I have tried to re-install QGIS but it still won't work. My version of QGIS is QGIS 3.24.3, and my computer is a ...
1 vote
1 answer
50 views

Saga Tool "RECLASSIFY VALUES(SIMPLE)" missing in QGIS

I'm in a new field of research and I'm having troubles following a procedure with QGIS. I'm extremely new to all this since I'm a chemist. The aim is to calculate the total green cover from a photo. ...
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SAGA doesn't show up under providers in QGIS [duplicate]

I want to use the SAGA processing tools, but it doesn't show up in the toolbox and when I go to processing > options > providers it doesn't show up. I have downloaded SAGA. What am I doing wrong?...
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1 vote
1 answer
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What does SAGA's flow connectivity show?

In the 'Channel network and drainage basins' algorithm from SAGA in QGIS, a couple of maps are generated. I can't seem to find any documentation on the different output maps. Am I missing something?
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What does "Fill Increment" mean with SAGA - Fill Sinks (QM of ESP) tool?

I am using the SAGA tool Fill Sinks (QM of ESP). The only adjustable parameter is called "Fill Increment". And the documentation is not very explicit about what it means. Is it the depth ...
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QGIS doesn't load up after "Setting up the GUI"

After the flash image loads "Setting up the GUI", it disappears and QGIS doesn't continue to run. It runs sometimes when I try to open QGIS through C:\Program Files\QGIS 3.22.6\bin\qgis-...
4 votes
1 answer
71 views

saga_cmd option for mosaiking tiles

I am looking for an example of how to mosaik DEMs together using the SAGA command line. Specifically, how to indicate the list of DEMs that you want to merge. I found saga_cmd grid_tools 3 -GRIDS <...
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Strahler stream order is not generated in any of the algorithm SAGA, PCRaster or GRASS in QGIS

When generating strahler order by SAGA in QGIS it indicate that QGIS version: 3.22.6-Białowieża QGIS code revision: b6f33b1a Qt version: 5.15.2 Python version: 3.9.5 GDAL version: 3.4.2 GEOS version: ...
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1 answer
356 views

GRASS and SAGA do not appear in QGIS processing toolbox?

I installed the latest version 3.24.1-Tisler and also installer GRASS 7.8.7, SAGA 7.8.2 and PCRaster using OSGeo4W (from 7.4.2022). All Plugins have been activated in QGIS as well as the settings in ...
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39 views

Calculating shortest distance between points within polygon using QGIS Continued - by group and ordered by longitude

I am trying to use something similar to the least cost paths in SAGA in order to draw a line through various points, grouped by unique ID levels, and ordered by longitude, and restrict it to a raster. ...
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Seeking description of SAGA's Watershed Segmentation parameters

I'm trying to understand some of the parameters in the Watershed segmentation tool in SAGA. Join Segments based on Threshold Value - Available Choices: [0] do not join [1] seed to ...
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Categorical raster values to points are incorrect near edges

I have a vector point layer, and a low-res, categorical raster. The raster is a map of habitat type, and it is in the form of a single-band which ranges from 1-55 where each number is a different ...
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1 vote
1 answer
236 views

Raster normalization

I have change my computer and I install QGIS on the new one. Now I can't normalise a Raster neither the LTR 3.16.16 nor the last one when I could with older 3.16. I found that the problem is SAGA, or ...
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38 views

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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QGIS 3.22.x module "Grid Statistics for Polygon" it´s not showing in the Processing tool box"

I couldn't find Sagas's "Grid Statistics for Polygon" in the processing tool of QGIS 3.22.x installed by OSGeo4W. I found the tool and was able to run it in Saga. Following opinions on the ...
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1 answer
142 views

QGIS Watershed Delineation - generated channels and drainage basins are incorrect

I am trying to delineate some watersheds using the SAGA GIS Tools in QGIS. The DEM I am using is the SRTM DEM. When I try to generate the channels and drainage basins using the SAGA>Terrain ...
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1 vote
1 answer
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QGIS SAGA Raster Normalization not working

I am trying to normalize (from 0 to 1) a 300 MB TIF file in QGIS but I only receive the following error code: The following layers were not created. [Path.sdat] See the 'Log Window' in the main QGIS ...
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QGIS 'layers not correctly generated' error when performing SAGA operations

I have been trying to execute a number of processes (for example 'watershed basins' or 'channel network' - as per this tutorial - https://docs.qgis.org/3.22/en/docs/training_manual/processing/hydro....
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65 views

SAGA Interpolate (cubic spline) not working

I'm using QGIS ver 3.20.3 and keep getting the following error when using Interpolate (cubic spline) tool from Raster - Spline Interpolation. The following layers were not correctly generated. • C:/...
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1 answer
268 views

SAGA or GRASS tools for RUSLE LS factor in QGIS

I need the LS grid for an area for RUSLE calculation. I ran both SAGAs Slope Length from Terrain Analysis - Hydrology and GRASS's r.watershed. The resulting LS factor grids are completely different. ...
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1 vote
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Problem using Fill sink tool (SAGA) in QGIS

I am trying to use the "fill sink" tool in QGIS, but it doesn´t work and I get the following log. What am I doing wrong? QGIS version: 3.20.1-Odense QGIS code revision: 1c3c5cd6 Qt version: ...
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1 vote
1 answer
156 views

Calculating cell size of DEM in QGIS

I am using the following raster calculation to create a topogrpahic wetness index in QGIS. TWI/CTI = ln(a / (tan (beta)) where; a=Upland contributing area: [(flow accumulation + 1 ) * (cellsize)] ...
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1 vote
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QGIS Flow accumulation tool frozen at 100%

My goal is to apply a topographic wetness index to a DEM using QGIS Version 3.20.2-Odense, running on a macOS laptop. I have clipped my DEM layer for the appropriate study area, and calculated slope ...
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What are the values in the output raster when using SAGA majority/minority filter in QGIS returns

I am using the Majority/Minority SAGA tool in QGIS 3.16.10 on a binary 0,1 raster file to try and smooth the classification. When I run this tool it generates a raster with lots of values between 0 ...
2 votes
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287 views

Layers can not be generated for Upslope Area tool in QGIS

I am using QGİS 3.18 Zürich version.Trying to delineate a river basin catchment. Lately, I followed following steps: Reprojected my DEMs Used SAGA 'Fill sinks (Wang&liu)' tool and obtained ...
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Plan curvature in QGIS

I am trying to obtain plan curvature from a DEM. So far I have tried two methods from SAGA and GrassGIS plugins, however both do not seem to work and give errors. Do you have a workaround suggestion? ...
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2 votes
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QGIS Gaussian Filter [closed]

I am optimistically hoping someone can shed some light on this. I am trying to apply a gaussian/low pass filter to a raster dataset. I naively applied the SAGA Gaussian Filter in QGIS to the below, ...
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1 answer
164 views

How to update SAGA tools on a Mac OSX

I am running QGIS 3.20 on my MacOS Monterey and it is working fine. Now I need to update the SAGA tools as it is well below (it has SAGA 7.3.0 and I am getting the message that it is not supported - ...
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30 views

Error and warning when converting SAGA grids to ESRI ASCII/binary grids?

I am converting an interpolated SAGA.sgrd format object to Esri ASCII/binary grids, but I am encountering an error when converting the object, the error is like: Error: input file [INTER_NN.sgrd] ...
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1 vote
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Installation path: GRASS and SAGA tools not running in QGIS 3.18+ (win 10)

I'm running QGIS on windows 10 and have a problem running GRASS and SAGA tools. The problem appears only when using QGIS 3.20 or 3.18. Using QGIS 3.16 on the same machine, using the same dataset and ...
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How do I install a supported version of SAGA for QGIS 3.16 on Mac OS 10.15?

I can't use the Split lines with lines SAGA tool, I get an error message saying SAGA version 7.3.0 isn't supported. Which version of SAGA is supported in QGIS 3.16, and how do I install it on a Mac?
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Stein's parameterization matern model kriging SAGA in QGIS

I performed autovariogram in R. It gave me the output seen below. It suggest using a matern model-Steins parameterization (indicated by the "Ste"). I would like to try the kriging tools by ...
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92 views

What do the kriging-parameters in SAGA QGIS mean?

I'm used to standard kriging-methods in an R environment. I'd like to know what each parameters in the kriging-tool from SAGA in QGIS mean. Parameters like: type of qualityindex Blockkrigen/Block ...
1 vote
0 answers
116 views

SAGA tool is showing issues or it is not competible in QGIS 3.16.11 LTR

I have installed in my Windows QGIS 3.16.11 LTR and wanted to use some of the function from SAGA tools, when I open the function it is telling that the SAGA officially does not support for this ...
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37 views

Algorithm for least cost path used by SAGA

I have to calculate the least cost path between two points and found this tutorial: https://dges.carleton.ca/CUOSGwiki/index.php/Cost_Path_Analysis_of_Mars_using_SAGA. That's why I also want to use ...
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Least cost path algorithm in SAGA?

I'm very new to this topic. I have to calculate the least cost path between two points for a school project and found this tutorial: https://dges.carleton.ca/CUOSGwiki/index.php/...
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Interpolation Error: Saying it is completed but doesn't show up

I am using processing toolbox Saga Interpolate (Cubic Spline) tool. I then enter the details needed interpolating and click Run. I get a task complete sign but don't get the file. In the Interpolate ...
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