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++.

Filter by
Sorted by
Tagged with
1
vote
2answers
50 views

Errno 13 “Permission Denied” when running tools and plugins on QGIS

I am having an issue with multiple tools when using QGIS where I am constantly getting PermissionError: [Errno 13] Permission denied type errors. A lot of it seems to be associated with tools that use ...
0
votes
0answers
20 views

Algorithm “Merge Layers” from SAGA not showing in QGIS Modeler

I'm trying to merge multiple vector-layers via the modeler in QGIS 3.14.1 as a part of a bigger model. As a matter of fact the QGIS-native "merge layers" algorithm doesn't work here, for the ...
-2
votes
2answers
50 views

Measure Points to Coastal lines?

I would like to measure the shortest distance from multiple points to a any part in a coast line of three different costs. How do I do this with QGIS or with SAGA GIS?
1
vote
0answers
31 views

How is Topographic Position Index calculated?

My understanding of how topographic position index is calculated is: TPI = cell value - (mean of cell values within defined neighborhood) But, I see that Weiss' original poster (http://www.jennessent....
1
vote
0answers
29 views

How to interpret the Maximum flow path length raster, from the SAGA Maximum flow path length tool

Does anyone know how to interpret the Maximum flow path length raster, after running the SAGA Maximum flow path length tool? I have used this tool and received a raster but I'm not sure how I can get ...
0
votes
2answers
132 views

Do SAGA tools work on QGIS 3.10.7?

Is anyone successfully using SAGA tools in QGIS 3.10.7? I have downloaded QGIS 3.10.7 on multiple PCs and a Mac. All of them have resulted in the same problem when I try to run SAGA tools. A message ...
-1
votes
0answers
18 views

Which function/method in GEE is similar to “supervised classification of shapes tool in SAGA GIS”?

For object based image analysis (OBIA), I have segmented my image. In next stage, I want to assign classes to segments (training data) followed by supervised classification of attributes data. In SAGA ...
0
votes
1answer
47 views

How to configure Saga Tools on Qgis script

I'm trying to use the process saga:paramemeltonruggednessnumber as following : melton_saga = processing.run("saga:parememeltonruggednessnumber", {'DEM' : path_filled, '...
2
votes
1answer
70 views

QGIS (3.10.7) SAGA tools resulting in “The following layers were not correctly generated.”

I am using QGIS 3.10.7 and want to use SAGA tools. I am using an ASCII file (.asc) with a projected coordinate system - EPSG:26919 - NAD83 / UTM zone 19N - Projected. When attempting to use the tools, ...
1
vote
2answers
163 views

Ubuntu 20.04 with QGIS 3.14 (pi) SAGA is missing

After updating to QGIS 3.14 in Ubuntu 20.04, SAGA is not available. The Log Panel (View->Panels->Log Messages) said SAGA didn't load. In the Processing Toolbox, the SAGA category is missing.
1
vote
1answer
52 views

Issue with CRS in R's writeRaster and SAGA's raster-format

I have a normal RasterLayer in R and I would like to write it to a file and visualize it in QGIS. When I look at in in R it says: class : RasterLayer dimensions : 3035, 1469, 4458415 (nrow, ...
1
vote
0answers
27 views

Calculate stream locations and Strahler order from DEM in QGIS

I am trying to locate streams and determine their order in QGIS. I have tried using several of the procedures described in answers to similar questions, but none of them seem to work. I have filled ...
0
votes
1answer
45 views

Installing Saga in QGIS 3.12 on Ubuntu 18.04.04

I have installed QGIS 3.12 through the Ubuntu Store and installed Saga 7.3.0 through: sudo apt-get install saga I tried to install QGIS through apt-get, as instructed in the documentation of QGIS ...
0
votes
0answers
9 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 ...
1
vote
0answers
16 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 ...
1
vote
1answer
20 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....
-3
votes
1answer
43 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 ...
0
votes
0answers
29 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 ...
0
votes
0answers
35 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 ...
0
votes
0answers
15 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 ...
1
vote
1answer
63 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....
1
vote
1answer
40 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 ...
0
votes
0answers
42 views

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... ...
2
votes
0answers
170 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 ...
-1
votes
1answer
122 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 ...
0
votes
0answers
21 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 ...
1
vote
0answers
17 views

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?
0
votes
0answers
41 views

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 ...
3
votes
0answers
47 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 ...
0
votes
0answers
36 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....
1
vote
1answer
1k 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?
2
votes
1answer
55 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 ...
1
vote
0answers
19 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 ...
1
vote
0answers
68 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" ...
0
votes
0answers
23 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,...
-3
votes
1answer
98 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 ...
2
votes
1answer
68 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.
0
votes
0answers
77 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 ...
8
votes
4answers
855 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 ...
1
vote
1answer
66 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 ...
0
votes
0answers
40 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" ...
0
votes
0answers
13 views

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 ...
0
votes
1answer
72 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?
2
votes
0answers
48 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,...
0
votes
0answers
42 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 ...
1
vote
1answer
145 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 ...
1
vote
1answer
45 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, ...
0
votes
1answer
49 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 ...
2
votes
1answer
71 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?
2
votes
0answers
46 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 ...

1
2 3 4 5
11