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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Problem with SAGA 9.2 Fill Sinks (wang & liu)
I don't know why when I use SAGA's fill sinks in QGIS the watershed basins are not generated, in SAGA GUI it works normally
Versão do QGIS: 3.28.13-Firenze
Código de revisão do QGIS: 3b4db4f561
Versão ...
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Difficoltà nell'inserire Saga in Qgis, [closed]
Sono nuova di Qgis, non riesco a inserire saga in qgis. Grazie
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SAGA processing and special characters
I’m using some SAGA processing for vector layers in QGIS.
Is it a way to change the default encoding in SAGA?
I have attribut value with french characters (é, ê, à) and after a SAGA Union, they are ...
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25
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Problem Polygon Line Intersection - SAGA QGIS
I have a ShapeFile with a series of polygons (ex: the yellow line is the common boundary between 2 polygons). I have another ShapeFile that contains a line (Pink) which crosses the limit line of these ...
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saga_cmd - process never ends
I am trying to use saga_cmd with the debian 11 (package v7.3.0) to create an interpolation process.
With Qgis, the process take around 1 minute and works fine, but the process seems never ends with ...
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39
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Problems with the SAGA Next Gen Tool "Resampling Filter"
When running the Saga Next Gen tool "Resampling-Filter" I get the error message:
failed: could not find a suitable import driver**" and "**[Import
Raster] Execution failed (less ...
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25
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Not able to get results with SAGA's regression tools
I'm trying to find in QGIS an analogous tool to ArcGIS's "Ordinary Least Squares". The tool takes in a shapefile, where the dependent variable and independent variables are all fields in the ...
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1
answer
420
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Installing SAGA next gen binaries in QGIS on a Mac
I am trying to use SAGA NextGen on QGIS and every time I try to run a program it has an error message saying that I need to update my SAGA binaries to 9.1. I am using QGIS 3.23.3 on MacOS. I have also ...
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48
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QGIS Strahler Order Too Many Stream Channels
I have this DEM file and I'm trying to extract possible rivers/streams from it.
However , when I run Strahler Order as tutorials on youtube indicate, the output shows too much lines that aren't really ...
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35
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SAGA cannot load any grids
Whenever I try to use a SAGA processing tool in QGIS which requires loading a file, it fails to load the files. The log message says:
Loading grid: [PATH] failed.
The tools I've attempted to use ...
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SAGA - Raster statistics for polygons is not working
I would like to generate the raster statistics for one polygon with the raster tool "Raster statistics for polygons".
The first try:
My data is this GeoTIFF and a Polygon both in EPSG:25832. ...
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1
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Trouble installing SAGA 7.2.0 in Ubuntu 22.04 to use with QGIS 3.22
I am trying to install SAGA 7.2.0 to use with Saga NextGen Provider in QGIS 3.22. However, the version on the Ubuntu aptitude repo is SAGA 7.3.
I've tried building from the official saga-7.2.0.tar.gz, ...
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27
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Multiprocessing passing a PySwig Object
I am trying to do some multiprocessing in Python using the PySAGA module. In order to avoid having to load the input raster for each worker I am trying to pickle the loaded raster to the ...
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SAGA Gaussian Filter Results Stretched
New to a lot of these tools, so it's possible that I'm simply misunderstanding how to use them.
I have a world raster of population data (1px=1km) that I'm trying to generalize (It's for children so ...
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Import .tif file in SAGA GIS
While importing the .tif file through Geoprocessing -> File -> Grid -> Import ->Import Image, I am getting the following error in SAGA GIS 7.8.2.
12:27:37 PM: Unknown field with tag 33550 (...
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31
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QGIS - LS Factor- Field Based
I'm working on the LS analysis for slope using QGIS - LS Factor Field Based Tool. I have input the DEM. However, the LS layers failed to generate, and it shows the errors as the SAGA version 7.8.2 is ...
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2
answers
759
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SAGA option (Fills SInk) option not available in QGIS Toolbox
How do I derive a river network and catchment from a DEM using QGIS?
I'm using the latest version of QGIS 3.30.3 and in it, the SAGA tool (and consequently, the Fill sinks option) isn't available in ...
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129
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Calculating TPI (topographic position index) and TRI (topographic ruggedness index) in QGIS
I know there are similar questions regarding the computation of TPI and TRI. However, I found myself a bit lost in how to perform the calculation in QGIS. So, I have DEM, and the projection is set to ...
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48
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SAGA/Cross Profiles not running correctly
I cannot get SAGA's Cross Profiles tool to run, it worked a few weeks ago when I discovered it. I've removed QGIS as well as the appdata/local and roaming directories and updated to LTR 3.28.7 ...
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54
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SAGA Close Gaps - using the mask parameter?
I'm trying to interpolate cells in a gap in a raster layer using SAGA's Close Gaps tool. It works fine when I don't use the mask parameter, but when I do, it fails to generate the layer. There's not ...
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2
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60
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SAGA intersect syntax for QGIS
I cannot find the exact python syntax for saga:intersect anywhere. The following throws "Could not load source layer for A: no value specified for parameter". It prints
laender = QgsProject....
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1
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How to resolve the watershed delineation failure in QGIS due to NO DATA values in 'Flow Direction File'?
How can I resolve the issue of getting errors while delineating a watershed in QGIS? I have tried using different DEMs (ALOS and Cartosat), but I am consistently encountering NO DATA values in the ...
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Problem with Basic Terrain Analysis in SAGA
I am trying to compute LS factor for UAE in SAGA with Basic Terrain Analysis tool, but it always show the same problem "could not initialize data objects".
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156
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Export GPX files from QGIS/SAGA that are compatible with Garmin Connect
GPX files exported by QGIS using SAGA do not seem to be accepted by Garmin Connect (web interface). Exporting GPX files via saving a QGIS GPX Layer loses the layers, so I'm using the SAGA export tool.
...
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335
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SAGA GIS - regression kriging
I have a problem with regression kriging in SAGA under QGIS. It gives me an error - could not execute the tool. I want to create temperature maps from data set of meteorologic station and DEM.
I have ...
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The following layers were not correctly generated grid calculator
I'm doing an assignment for a mapping class and I'm literally stuck trying to create a DEM file using the grid calculator under SAGA. I'm following the directions we were given and I have searched for ...
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Adding point into SAGA map
Assuming I have built a TPI-based landform classification map in SAGA, how can I label the sample location (with sample location ID, coordinates x and y) in the existing map? I have the sample ...
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Seeking GRASS r.neighbors equivalent in SAGA
I would like to use the GRASS 8.2 equivalent of r.neighbors in SAGA 2.3.2 with the average method for the neighborhood operation. From what I understand I have to use a SAGA tool under Grid then ...
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Concatenation of commands in SAGA grid calc
My goal is to mask pixels with chosen value, for example if g1 is equal to x1,x2,x3 the resulting pixel has to be set to 1 otherwise to 0.
Trough grid calculator I've tried this command:
eq(g1, (x1 or ...
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SAGA 8.5.1 cmd not working on Linux RStudio Server RedHat 7.9
Trying to run saga_cmds on RStudio Servier but cant get saga_gis() to work. SAGA Version 8.5.1 cmd not working on Linux RStudio Server RedHat 7.9
library(Rsagacmd)
> saga <-saga_gis(...
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1
answer
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SAGA Majority Filter output error
I have a simple raster dataset (GRASS topidx) that has been rounded down, so all the cells are integers. When I use the SAGA Majority filter in QGIS, the cells are no longer integers. I have modified ...
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1
answer
49
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Iterating SAGA Split Features Layer tool across files in directory using python
I have a few thousand polygon shapefiles in a folder that I would like the SAGA Split Features Layer tool to perform its operation on. The operation and parameters are the same for every polygon, but ...
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Unable to run SAGA-Terrain Analysis-Fill sinks (wang&liu)
I am trying to do a Watershed analysis using QGIS. However if I want to run the SAGA function Fill sinks (Wang & Liu) I get an error that the 3 files were not created (full error down below). I ...
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TWI (Topographic Wetness Index) The following layers were not correctly generated [closed]
QGIS version: 3.22.9-Białowieża
QGIS code revision: a8e9e6fae5
Qt version: 5.14.2
Python version: 3.8.7
GDAL version: 3.2.1
GEOS version: 3.9.1-CAPI-1.14.2
PROJ version: Rel. 6.3.2, May 1st, 2020
SAGA ...
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Error with Lapse Rate Based Temperature Downscaling saga_cmd
I am new SAGA and want to resample a temperature low resolution geotiff with a higher resolution DEM to have a better sense of temperature. But always get ERROR in Temperature LORES_T
I have done the ...
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4
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1
answer
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Removing dropped line using fourier transformation?
I've noticed a 'dropped line' in only one band of SPOT MS image, as seen similar to added example. By applying fourier transformation to the band in SAGA GIS, the dropped line can be clearly spotted ...
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3
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1
answer
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QGIS 3.16, 3.22. SAGA tools not working. ERROR: Loading resulting layers The following layers were not correctly generated
I've tried multiple SAGA processing tools (Tools tried include: "clip raster with polygon". "Fill sinks Fill sinks (Wang and Liu)". "Polygon Centroids.". It seems that ...
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306
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Watershed segmentation in QGIS without SAGA
I have a model in the QGIS model builder that extracts illustrative tree canopies from LiDAR. The model works really well but relies on the boundaries of watersheds from the Watershed segmentation ...
- 1,565
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59
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Problem using SAGA tools in QGIS3
I had no problem earlier this year (I don't use these tools every day), but at least since v3.22, most of the SAGA tools will fail automatically with no useful error message. The tool starts, but ...
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What is the latest and stable QGIS version support SAGA with Multilevel B-Spline interpolation
I am trying to interpolate elevation points to create a digital elevation model (DEM) on QGIS (v3.22.13). One previous research suggests that Multilevel B-Spline interpolation (MBI) in SAGA is the ...
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208
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SAGA does not work in QGIS
I have installed QGIS 3.28, but only the SAGA Plugin does not work at all, however it worked earlier in old QGIS stable version. Now it does not even work in the old version too. Always says
The ...
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QGIS: global solar irradiance calculation and analysis
I am working on a climate change project where I want to have a map showing the average temperature per month at a local scale. I want to use the following data: average temperature from weather ...
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46
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Raster masking keep old extent
I want to clip a raster file using for mask other raster file and in SAGA GIS provider tool QGIS QGIS Processing | Raster Tools | raster masking .
I realized the new masking file keeps in the ...
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Both GRASS and SAGA fails on QGIS 3.28
After having trouble with GRASS and SAGA on my Windows laptop, I have just reinstalled QGIS but it has not solved anything. Hopefully I'm missing something obvious, but I cannot for the world figure ...
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How can I set raster outliers in QGIS to nodata?
for further analysis I want to execlude raster outliers (mostly single pixel values).
Therefore, how can I set global raster outliers (e.g., mean +- 2*sd) to nodata value in QGIS?
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3
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Running SAGA tools from Pycharm standalone QGIS (PyQGIS)
I am trying to run SAGA through the Python interface of QGIS. So far I have worked with only Native QGIS, and below code works for native. I would like to use SAGA fromout the same script, but am ...
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77
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SAGA GIS Object based Image Analysis
I'm performing OBIA On SAGA 7.1, the segments image has white background that will not allow me to view raster image beneath for supervised classification. The issue remain even when I set background ...
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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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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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2
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262
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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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