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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7 views

SAGA Aggregate tool in QGIS yields empty result

Using QGIS 3.10.1-A Coruña, the SAGA Raster Tool Aggregate appears to yield no output, despite finishing normally. No new layer apears in the Layers window, nor do I see an output file specified in ...
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15 views

Identify false outlets on a river network

I have a river network that is very poorly defined (lots of gaps). I need to identify all the false outlets. The picture below provides an example of one of these false outlets. The image shows ...
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1answer
17 views

SAGA Point Statistics for Polygons

I am running QGIS 3.10 on a MAC using Catalina (and I also tried on QGIS 3.4) and tried to run SAGA Point Statistics for Polygons. Every time I run it I get an error with it trying to create the layer....
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36 views

How do I get average temperatures and precipitation data into QGIS or SAGA GIS?

I need average temperatures and precipitation data (if possible as grid) for Germany and I found this source: https://opendata.dwd.de/climate_environment/CDC/ But I have no idea on how to load it ...
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20 views

Isochrone Variable Speed (SAGA): issue with the catchment area layer

I'm trying to use the "Isochrone Variable Speed" SAGA tool in order to modelize the runoff speed within several drainage basins. I don't face particular issues with the tool itself since I get ...
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25 views

Can't enable SAGA GIS algorithms in QGIS on Ubuntu OS

I have QGIS is 3.12.2 version and SAGA GIS 7.7 version in my Ubuntu OS. In processing settings providers I can't enable SAGA algorithms . In settings providers show me it is active but does not ...
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30 views

Polygonized a land use map (raster) in QGIS but the output is just a black shapefile. How do I fix this?

So, I have a land use map that I need to digitize. The changes in the map is very fine so it will take a long time to manually digitize it. When I used the Raster > Conversion > Polygonize (Raster to ...
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13 views

QGIS - Why are there multiple rows for each line of the line layer on which saga:crossprofiles is run via PyQGIS?

Intended result I have a layer that contains as features individual lines of varying lengths and seek to construct a layer that contains 100 equally-spaced elevation values over the length of the ...
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1answer
49 views

SAGA Tool clip raster by mask layer for QGIS standalone script

In my PyQGIS standalone script I want to use the SAGA Tool "Clip raster by mask layer". I have tried to following. def clipRaster(self): raster = self.getRasterLayer() vector = self....
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39 views

Is it possible to create specific-sized watershed in a GIS environment? [closed]

I used the GRASS gis module to design catchment area with a minimum size of 2 kmsq. However, I would like to know if, in addition to the minimum size, I can limit a maximum size of 5 kmsq for them. In ...
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package RSAGA : rsaga.geoprocessor error INPUT with R

I'm a french student, in advance I'm sorry for my english. I'm using RSAGA package to apply Gaussian Filter in my Canopy Height Model (CHM = DMS-DMS). I try this with RSAGA package, see below... ...
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53 views

How to open HDF5 file on QGIS

I've acquired an extensive collection of HDF5 files of Net Ecosystem Exchange data with daily temporal resolution. It seems that QGIS cannot open the file type by just dragging and dropping (while ...
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1answer
83 views

Python fmask from command line or in Python script

I'd like to mask some clouds in Sentinel-2-Images with the python-fmask-library. As I'm not too experienced with Python and remote sensing, I have some questions. When I installed the library I ...
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20 views

Running raster mosaic in batch process in QGIS

I am wanting to mosaic multiple rasters within the same month into a single raster. I am trying to achieve this using the SAGA Mosaic Raster Layers tool within QGIS as part of a model (via the ...
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How can I use QGIS's Saga watershed algorithm's “Borders” to extract from point cloud las?

How can I get the boundaries of the "Borders" returned by QGIS's SAGA watershed algorithm? So that I can extract/classify the areas inside borders from point cloud .lases?
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Error while installing specific version of SAGA GIS on Ubuntu 18.04

I would like to install SAGA 6.4 on my ubuntu 18.04. Until now I ran the most recent 7.6, but due to some reasons I'd like to install 6.3. So I donwloaded the tarball, extracted it, ran ./configure ...
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43 views

Proj4 string missing datum information for SAGA outputs loaded into R

I've produced a set of topographic derivatives using both SAGA and ArcGIS. They are all in the same CRS. When I load them into R, however, the proj4 strings are different: >arcRaster class ...
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34 views

SAGA Tools not working in QGIS 3.6.1 with GRASS 7.6.1

I installed QGIS 3.6.1 with GRASS 7.6.1 As I am trying to get administrative borders from old map. I did some pre-processing in GIMP and already selected the borders with treshhold functions and so on....
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1answer
789 views

Moran’s I (spatial autocorrelation) in QGIS or SAGA?

Is there a way (plugin/processing tool) to calculate Moran’s I as a measure of spatial auto correlation of a point pattern in QGIS or SAGA?
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1answer
42 views

Set QGIS 3.X additional dependencies in Manjaro

I am running QGIS 3.10 under Manjaro. I would like to add SAGA and R support to my QGIS tools as described in this thread (Configuring QGIS and SAGA on Ubuntu). The solution described here does not ...
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17 views

Saga or RSAGA wind.shelter

I would like to run the Saga wind shelter index (wind.shelter). It was apparently on older versions of Saga and has been re-added to Saga 7.4 and 7.5 Here is what I have done: Installed Saga 7.3 ...
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62 views

QGIS 3.10.2 and SAGA on UBUNTU

When I run QGIS the log messages panel shows something like this: problem with SAGA installation: SAGA version non supported (found 7.4.0 required 3.2.). But in a ubuntu shell the command "saga_cmd" ...
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22 views

Mosaicing BIG Rasters based on data values

I have some rasters that contain spectral data, and some spatially identical rasters that have the nadir information from the acquisition for each pixel. I'm looking for a way to mosaic these together,...
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1answer
93 views

RUSLE - LS - Factor - “Catchment Area”

Regarding to the SAGA GIS LS Factor module (http://www.saga-gis.org/saga_tool_doc/2.2.0/ta_hydrology_22.html), how should be executed the option with the "Desmet & Govers (1996)" method? Despite ...
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1answer
63 views

Meaning of zero “0” value in raster layer produced by Soil Texture Classification tool in QGIS?

How to interpret zero "0" value in raster layer produced by Soil Texture Classification tool in QGIS? It cannot be found in classification table.
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62 views

Plotting the DEM into QGIS 3.10 from the CSV through SAGA

I had troubleshot with creating a DEM in QGIS SAGA, using this example: https://www.geodose.com/2018/09/how-to-create-dem-elevation-profile-qgis.html When I filled up the box as per below: I get an ...
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4answers
639 views

No SAGA available in QGIS Processing

I am running QGIS 3.4.14 on Ubuntu Linux 18.02. I cannot see the SAGA tool in the QGIS Processing window. I can confirm that I have SAGA 7.3 installed and working as a stand-alone GUI application. I ...
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1answer
64 views

SAGA difference tool in QGIS

I am using QGIS 3.4 Madeira. I want to use difference tool from SAGA from the processing tool box since my data has some invalid geometries and want to fix the issue later after using difference tool ...
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35 views

SAGA error running “Raster values to points” (“shapes_grid” library)

I am using QGIS 3.10 and I want to generate a "fishnet" shape coincident with the pixels in a raster. I've done this before (in QGIS 3.4) using the "Raster values to points" SAGA tool ("shapes_grid" ...
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Outputting SAGA-classified grid into form that can be opened in ENVI with information of each classes

I'm new in SAGA and classification. I used the tool called "Local climate zone classification" in SAGA and I want to open it in ENVI to do the validation and stats analysis. What I output is a .tif ...
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1answer
57 views

Getting *.las file data into SAGA las processing tools?

How do I get .las files into SAGA las processing tools? Do I have to convert *.las data to *.sprm format first? If so, how?
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45 views

QGIS 3 Processing tools don't seem to work (can't load output)

I've got a new machine running on Win10 (I was previously on Win7) and I can no longer use... pretty much any algorithm, especially from SAGA. It's probably something to do with environment variables,...
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39 views

Creating DEM from contour or point shapefiles in QGIS [duplicate]

I'm trying to make a DEM tiff file from elevation shapefiles that I have in QGIS. I have both contour shapefiles and XYZ-point shapefiles but I can't seem to make the DEM. I've tried using SAGA but ...
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1answer
110 views

Qgis SAGA Upslope Area for several points automation

In the Upslope Area tool from SAGA it used to be possible to import the point file with multiple points and it would create several catchment/basins areas for those points. Now, it is only possible to ...
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1answer
43 views

Unexpected error while RSAGA raster calculations

I want to use RSAGA package in R to calculate the topographical wetness index. However, while applying the rsaga.wetness.index() function, R gives me an error message (see below). My question is, ...
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1answer
38 views

QGIS export DEM to SAGA grid - no coordinate system

I have created a DEM using survey points from a GNSS system. Works like a charm so far. I can extract elevation lines etc. However, when I export it as a SAGA grid it looses the coordinate system. I ...
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1answer
66 views

Define Range when calling SAGA Kriging from QGIS

Is there a possibility to define the range-value or display the Variogram when you call the SAGA-Kriging-Module from QGIS? Maybe by using the python console?
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42 views

QGIS - SAGA Majority Filter creating huge output files

I am trying to perform a workflow that I have made in QGIS which operates on very large rasters (38244x62124). Leading up to this, I have been able to run various GDAL tools if I specify that the ...
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30 views

Topographic Wetness Index difference between SAGA and TauDEM

I calculated Topographic Wetness Index (TWI) using SAGA and TauDEM. Overall trend is similar but SAGA returned larger values compared with TauDEM. Sometimes the deviations are as large as 7 or 8. I am ...
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1answer
126 views

SAGA library is not visible in Processing Toolbox

The screenshot of Options > Processing I have SAGA plugin activated in my QGIS 3.8 on a Ubuntu 18 LTS machine. However, it does not show up in my Processing Toolbox. Could anyone help me solve ...
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29 views

Topographic Wettness Index for ecology; SAGA; usage of “sink route” for flow accumulation

The Goal is to Create a Topographic Wetness Index for ecological Studies. Saga-GIS 7.3.0 General Approach for TWI(Kopecky) calculate slope from original DEM (no filled sinks) prepare DEM with ...
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18 views

How to select bands in saga_cmd?

I want to calculate NDVI for a BGRN tiff file using saga_cmd http://www.saga-gis.org/saga_tool_doc/7.3.0/imagery_tools_1.html The problem is that I have to specify the RED and the NIR inputs. I would ...
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50 views

Use of QGIS/GRASS/SAGA procedures on Geometry Generator

Im new at QGIS, started 2 weeks ago. I'm trying to automatize the display of a map and get rid of some "duplicated" layers and all the extra work. I need to know if SAGA's dissolve can be used in the ...
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53 views

Classification result from SAGA GIS shifted by 5 meters if used in ArcMap?

I use a band composite of 10 Sentinel-2 bands for my classifications. If I use the same composite in SAGA to make a classification this classification result is shifted by 5 meters to the left and to ...
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59 views

Least Cost Path in QGIS: Plugin or SAGA or GRASS?

I downloaded a SRTM file and followed this tutorial and now I have a hillshade layer and a color layer. It looks like this. I want to calculate the least cost path between p1 and p2. But I'm not ...
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1answer
154 views

What unit is the topographic openness (SAGA GIS)?

The SAGA GIS tool "Topographic Openness" calculates the positive and negative topographic openness and is based on Yokoyama et al. (2002) who do not specifically say the unit of the final result. They ...
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1answer
86 views

Clipping converts multiband to single band

I have a multiband raster image. I am trying to extract the AOI by using "Clip raster with polygon" option in SAGA module. The process clips the raster to the exact size of the polygon but the ...
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0answers
104 views

Saga GIS Snap Points to Lines tool doesn't produce required results

I have two sets of data that I'm using. Points extracted from a .csv file and a road network from an ESRI .shp file (both of which I've included here: https://send.firefox.com/download/...
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1answer
340 views

What is the purpose of these SAGA raster mosaic parameters?

BACKGROUND: Using QGIS 3.8.0 Processing > Toolbox > SAGA > Raster tools > Mosaic raster layers, I do not understand the purpose of the Match and Fit parameters. Here's a screenshot of the Match ...
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1answer
90 views

What are the formulas used in SAGA Ordinary Kriging?

can some one name the formulas avaible in the Ordinary Kriging Modul of SAGA: What ist the exponential, spherical, Gaussian-Model, etc.?

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