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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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-...
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2 votes
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+50

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 vote
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Delineate valley floor and valley width in SAGA GIS [closed]

How can I delineate valley floor and compute valley width in SAGA GIS?
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1 answer
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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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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 answer
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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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  • 170
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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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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
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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 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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1 answer
192 views

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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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
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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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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 answer
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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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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 ...
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1 vote
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162 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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63 views

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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103 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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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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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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49 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 ...
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1 vote
0 answers
93 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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26 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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2 votes
1 answer
41 views

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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1 answer
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Outputs of Slope, Aspect, Curvature SAGA tool

I'm trying to calculate slope, aspect and curvature from a DEM with the "Slope, Aspect, Curvature" tool provided by SAGA. To accomplish this, the tool gives different methods to calculate ...
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Deposition as an output in GPP SAGA GIS

I am trying to develop a model using GPP. I need to generate a deposition layer. In the input parameters I put a DEM, Release Areas Raster, a Material Raster (Height of material available in each ...
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1 answer
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Explaining difference between Sky View Factor and its simplified version in SAGA's algorithm

I calculated the Sky View Factor using SAGA's algorithm. It generates different outputs: Module Sky View Factor. However, I could not find the difference between the outpus, especially among 'Visible ...
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3 votes
1 answer
154 views

Multilevel B-spline not working SAGA QGIS

I try performing a multilevel spline interpolation from the SAGA tool but I get an error message. I have loaded a CSV consisting of 1500 points with latitude and longitude and elevation values. I'd ...
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1 vote
0 answers
49 views

SAGA Ordered Weighted Averaging tool in QGIS Errors

I'm attempting to use the SAGA Ordered Weighted Averaging tool in QGIS (3.16) and am running into a few errors. Every time I've run the tool I've used the same number of inputs as weights in the table,...
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61 views

Outputs of "Strahler Order" and "Channel Network and Drainage Basins" different despite same threshold

I ran the Strahler Order and the Channel Network and Drainage Basins tools both with threshold at 8 and using the same filled DEM. The results differ as shown below. Strahler Order raster (only ...
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"Channel Network & Drainage Basins" works if the filled DEM is from "r.fill.dir" and not "Fill Sinks (Wang & Liu)"

I'm using QGIS Desktop 3.16.9 and was doing this video https://youtu.be/2Ub0c7Ss-T4. The instructors used "Fill Sinks" and then the "Channel Network & Drainage Basins". When I ...
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48 views

SAGA tools for scripts

Is there any way to use SAGA tools to a standalone Python script outside of QGIS that can run with Windows compiler?
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146 views

Ordinary kriging is not working in QGIS 3.20 & SAGA-7.2.0

I am using below data for making kriging interpolation. structure(list(Serial = c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 13L, 14L, 17L, 18L, 24L, 28L, 30L, 31L, 36L, 37L, 43L, 44L, 46L, ...
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1 vote
1 answer
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How to Add XY Values to each Cross Profile record when using SAGA Cross Profile Algorithm

When using the SAGA algorithm to create Cross profiles of depths from a DEM is there any way to add XY values to each of the depth values created and stored in the attribute table?
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1 vote
2 answers
1k views

Upslope area shows an error stating tool needs graphical user interface

I tried delineating catchment area of a place. First I downloaded the DEM TIFF from internet. Then reprojected it to the required CRS. Then I used the Fill Sink tool and Strahler Order after that. ...
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1 vote
1 answer
156 views

"gdal:cliprasterbymasklayer" return nothing in PyQGIS3

I'm working on a plugin for QGIS3, and trying to clip a raster layer using a vector mask layer. I've been able to successfully do this using "Clip raster by mask layer" through the ...
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1 vote
0 answers
52 views

QGIS SCP SAGA Close gaps with stepwise resampling

I am working with QGIS 3 and classifying images in Indonesia. Indonesia has a high cloud coverage. I started with classifying a Sentinel 2 image with the SCP Tool and got my classification output. I ...
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1 vote
0 answers
125 views

SAGA not working in QGIS 3.16 on Mac OS 11.2

In the Toolbox, the SAGA tools are greyed out, for example: I can still double click on the tools and open the dialogue box, although a warning is displayed: I've tried a few tools and they will run,...
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22 views

QGIS - SCP Classification - Clouds and Shadows

I am working with QGIS 3 and classifying images in Indonesia. Indonesia has a high cloud coverage. I started with classifying a Sentinel 2 image with the SCP Tool and got my classification output. I ...
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33 views

Finding the sign of the distance values in the "Add polygon attributes to points" function

For the evaluation of my tests I would like to determine the deviations of the test coordinates from the nominal line. Currently I use the function "Add polygon attributes to points" in the ...
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