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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25 views

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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35 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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31 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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29 views

No output for drainage basins in QGIS

I am trying to create channels and drainage basin by using "Channel Network and Drainage Basins" via SAGA tools in QGIS 3.18. I am setting the treshhold as 8, since I obtained best results ...
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28 views

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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42 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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29 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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1answer
52 views

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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15 views

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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26 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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48 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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23 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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23 views

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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1answer
27 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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1answer
19 views

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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5 views

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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1answer
33 views

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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1answer
61 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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29 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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26 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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21 views

"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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26 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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80 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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1answer
18 views

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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2answers
387 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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1answer
49 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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26 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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57 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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19 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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15 views

The number of supplied grids is less than the number of variables in formula

I'm completely new to SAGA. The documentation is really rough with me, and there are not many examples around, so I try to fly by instruments. I tried this: saga_cmd grid_calculus 1 -GRIDS 011x002-...
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2answers
376 views

Which version of SAGA is included with QGIS?

Is there a way of working out which version of SAGA has been packaged with a particular version of QGIS from qgis.org - without downloading and installing? The reason I ask is that I am trying to run ...
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1answer
30 views

Calculate TPI for irregular DEM

When I use SAGA's Tool Topographic Position Index (TPI) or Tool TPI Based Landform Classification (in QGIS or SAGA itself) on a rectangular DEM the results are as expected but when I try them on a DEM ...
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1answer
301 views

Installling supported version of SAGA to work with QGIS on Windows

I'm running into issues with SAGA processing algorithms in QGIS 3.18. QGIS tells me that SAGA 7.8.2 isn't supported, but doesn't tell me which versions are. I've seen a suggestion that 2.3.x is ...
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59 views

QGIS SAGA's Principal Component Analysis (PCA) makes output rasters (components) bigger

I have multispectral TIFF bands/features (dtype = float32) that I passed onto QGIS SAGA Principal Component Analysis tool to perform PCA. The bands are each a separate file but have exactly the same ...
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1answer
107 views

What version of SAGA is supported by QGIS 3.18 on Ubuntu 20.04.2, and how do I install it?

I have been using QGIS on Windows 10, but now have installed Ubuntu (20.04.2) on a high spec laptop and want to use QGIS on that instead. I installed QGIS 3.18; SAGA was not installed with it. sudo ...
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49 views

Is it possible to do directional variograms and kriging in SAGA or QGIS?

I'm trying to create directional variograms and do kriging for anisotropic soil data in SAGA or QGIS. Aside from setting the direction to quadrant in SAGA, I can't seem to find a way to do this. Is ...
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38 views

Grid from SAGA natural neighbor results in black grid

I'm new in QGIS and I'm following tutorials mainly on YouTube so I created a path in Google Earth then exported to kml which is converted to txt via GPS visualizer. When added delimited layer it shows ...
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103 views

Extracting ridges and peaks in QGIS

Is there a way to extract mountain ridges in QGIS? I have been trying to use the Valley and Ridge Detection SAGA tool, but it freezes for hours and I am wondering if there is a faster or alternative ...
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55 views

Making Ridge Line and Valley Line from Contours or DEM using SAGA GIS

How do I make ridge lines and valley lines using open source GIS Software? I am totally stuck. I found solution in SAGA GIS - also available in QGIS but it freezes when I run it. http://www.saga-gis....
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1answer
122 views

Why do I get negative values for the topographic position index (TPI)?

I run into issues, when trying to calculate the topographic position index (TPI). I get values ranging from -13 to 17. And the resulting layer looks a bit odd, too: If I understand it correctly, this ...
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67 views

Accessing SAGA algorithms (majority filter in particular) in QGIS

I'm using QGIS 3.18.1 and have downloaded SAGA 7.8.2 (following Integrating SAGA 7.8.1 into QGIS 3.16 (OS Windows 10)). However, the majority filter option remains greyed out. I have tried installing ...
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32 views

Accumulated Cost (Anisotropic)

I want to calculate a cost surface (anisotropic) using the SAGA tool. I am using a 'slope' raster for the cost grid entry, an 'aspect' one for the direction of max cost. I have to put the destination ...
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1answer
50 views

QGIS - Raster Calculator VS Raster Difference (SAGA)

I am trying to calculate the difference between two rasters. If i use Raster Calculator in QGIS I get the correct result (when manually checked using the information tool and the pixel values for the ...
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78 views

gdal_viewshed's results are suffering some glitches vs visibility analysis from SAGA

I'm seeing some artifacts when using gdal_viewshed vs the ta_lighting tool from SAGA-GIS. Small differences are noticeable between both visibility results. As I wasn't sure which one was "wrong&...
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56 views

SAGA tool polygon self-intersection: time to prosess increases exponentially with increasing buffer width

With QGIS 3.10 I try to find overlapping areas and the number of overlaps of buffers with the SAGA tool "Polygon self-intersection". The tool works fine with round buffers around points with ...
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37 views

Google Earth Engine exported image with missing records in some bands

I've been exporting an ImageCollection (Sentinel-2 data) on Google Earth Engine by stacking the images with the toBands() function. Before, during image collection I've used a function to mask clouds ...
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22 views

Finding only one class (stones) in aerial image using SAGA GIS

I have a color infrared image of a mountain with trees, meadows, clusters of stones and single stones. For my work I need to identify only the pixels that cover stones, everything else is secondary. I ...
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512 views

QGIS 3.18 and 3.16 LTR install. GRASS and SAGA not working. MacOS OSX

I have tried to update QGIS on Mac to either version 3.18 or 3.16 using the installers on the QGIS page (https://qgis.org/en/site/). I have been having issues getting the GRASS and SAGA providers ...

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