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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2
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1answer
276 views

Ordered weighted averaging error: can only concatenate list (not “str”) to list

I am trying to perform an ordered weighted average on two rasters in QGIS 3.0.3 (as a trial run for doing it on more than two rasters). But I keep receiving the following error code: Traceback (most ...
1
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1answer
648 views

Coordinate system change in SAGA

I know it is an overasked question but I do not find anybody able to explain properly how to do that in SAGA 6.3. The problem is that my shapefile, i.e. the borders of my country, do not overlap ...
2
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0answers
394 views

Empirical variogram plot in QGIS

I am trying to do kriging on mortality rates using QGIS (I have version 3.0 but I downloaded the 2.18.20 to be able to follow the web documentation and most of the answers here). From what I have ...
2
votes
1answer
56 views

How can I adopt updated qgis\python\plugins\processing\algs\saga\description txt files?

I have one question: How can I adopt updated qgis\python\plugins\processing\algs\saga\description txt files? The rest of this text is "enough detail to identify an adequate answer". I will try to ...
3
votes
1answer
68 views

calculate 'predicted class' raster in QGIS

I have six raster layers that represent the probability of each pixel belonging to a specific vegetation type. I would like to use these to generate a new raster where the value of each pixel is the ...
0
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1answer
55 views

Interpolation of holes resulting from DTM groundfiltering of SfM pointcloud

I am wondering if there is an efficient interpolation method to close the holes in a dtm resulting from groundfiltering. At the moment I am directly interpolating the point cloud to a raster using ...
1
vote
1answer
206 views

SAGA-GIS 2.3.1 Segmentation Fault on launch

I recently installed QGIS, GRASS, and SAGA-GIS-LTR onto a Manjaro (Arch Linux-based) system in order to make use of their newer libraries. While most of the software is working fine I did need to ...
1
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0answers
241 views

QGIS 3: saga algorithm in console

I'm trying to use the saga algorithm 'quadtree structure to polygon' (with points to get polygons), in the python console. But I think I'm not able to set the parameters correctly. When I call the ...
2
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0answers
387 views

Saga Catchment Area not giving expected (useful) output

I am identifying a catchment network from a DEM in QGIS3 (v3.0.3) (on a mac v10.13.4), however the step to identify the Catchment Area is not working. I have an input DEM, with layer CRS set to ...
2
votes
1answer
472 views

Ordered Weighted Averaging problem

I want to do an Ordered Weighted Averaging (OWA) analysis using SAGA in QGIS (not by using pyqgis) as a suitability assessment for recreation/restoration of specific habitats. There's a number of ...
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0answers
321 views

QGIS SAGA Gaussian Filter brings error when run

Every time I run the SAGA Gaussian Filter tool, I get an error. I am trying to filter a raster file indicating a risk index (GeoTIFF, 32-bit float) in order to smooth it. The log message I get is ...
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0answers
312 views

Saga difference vector tool

My QGis Difference tool doesn't work really well, it gives me lots of little squigly lines. i read in the link below there is such a thing as a vector diffence tool from SAGA, but i can't find it. ...
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0answers
447 views

Creating sub-watershed within a basin

I am a beginner to QGIS. My problem is I tried to create sub-catchment within a basin by using provided point datasets (river gauge location). In total, I have 12 measuring points (i.e 12 pairs of x ...
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0answers
78 views

QGIS 2.18 SAGA Change Data Storage

I tried to use Change Data Storage to change the bit depth of some rasters, but it doesn't work or gives me vague errors I first tried to batch convert some rasters to unsigned 1 byte interger, I ...
1
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1answer
425 views

Making all values in raster same using QGIS?

I need to convert all the values in a raster to one certain value. How can I do this? (I tried using raster calculator, but any operation that would result in a raster having all one value makes it ...
7
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2answers
191 views

Prevent SAGA in QGIS 3.0 from creating certain outputs?

I'm wondering if there is a way to prevent SAGA from generating temporary files. For example, if I just want to generate a slope map using SAGA I have to wait for all 11 other grids to get processed. ...
3
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0answers
218 views

Saga clip raster with polygon missing cells entirely within the polygon

I am using SAGA's Clip Raster with polygon tool in QGIS 2.18.4. It is missing an entire row of cells which are entirely contained within the clipping polygon (see image, original DEM in colours, ...
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0answers
148 views

Setting maximum slope/flow length in flow accumulation using SAGA?

I like to limit the slope length in SAGA GIS. In other words, the flow accumulation should only account for a specific length until a subsurface flow initiates and surface flow stops. Actually, I ...
6
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2answers
824 views

Compute flow accumulation only from flow direction?

I am looking to calculate flow accumulation from a flow direction raster. In ArcGIS there is Flow Accumulation (http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/flow-accumulation....
9
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1answer
679 views

QGIS 3 and SAGA 3.0+ Integration

I've looked all over the net and I'm wondering if there are any plans by the QGIS developers to integrate some of the newer versions of SAGA available in the repository and as binaries on the project'...
1
vote
1answer
579 views

“Cross-classification and tabulation” tool is not outputting a table

In QGIS3 I’m trying to use SAGA’s "Cross-classification and tabulation” tool from the processing toolbox, and based on the documentation (http://www.saga-gis.org/saga_tool_doc/6.3.0/grid_analysis_13....
0
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1answer
64 views

Removing all pixels at apprx. ground level in orthomosaic? [closed]

At the moment I am processing an orthomosaic from a plantation and I would like to remove all pixels at ground level to just keep the plants captured on the image. I would prefer to be using QGIS. ...
1
vote
1answer
311 views

Batch processing in QGIS SAGA Algorithm

i'm struggling to run batch processing multilevel b-spline interpolation for my surface area the below error message keeps on poping up after the process> Processing algorithm 1/3... Algorithm ...
1
vote
1answer
973 views

Interpreting results in legend, SAGA GIS or QGIS? [closed]

Can somebody explain to me what units of measurement do I get in the results of analysis, ground morphometry in SAGA GIS software or through a plugin in QGIS? for example: Terrain ruggedness index (...
1
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0answers
157 views

Implement Basic Terrain Analysis(SAGA) by Python

Basic Terrain Analysis is in Processing Toolbox of QGIS and it has many output results, like Channel Network, Drainage Basins, Valley Depth, etc. I just want to get Channel Network among these results....
3
votes
1answer
1k views

volume of a raster

I have two rasters from which i want to calculate the volume difference between the two. I made a 3rd raster that shows the difference between the first two rasters. So i think calculating the volume ...
4
votes
2answers
326 views

Getting the average of maximum values from raster (tree top segementation)

I've got raster with elevations of trees in a forest. I would like to find out the average tree height of all trees in a given area. Because of the geometry of a tree top (which is like a cone and ...
0
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0answers
41 views

SAGA Maximum Flow Length problems with the Coordinate systems

I'm new to SAGA. I've got a srtm data set from europe and want to charge the maximum flow length especially from the river Elbe. The data is in WGS84 So first I ran the tool "Fill Sinks"(Wang & ...
2
votes
0answers
194 views

Add polygon attributes to points fails to create layer

I'm trying to add polygon attributes to a point file with a lot (~370,000) of points in QGIS v3.0.0. I first tried using the point sampling tool, which I've used with success pulling the values from ...
2
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0answers
124 views

While learning SAGA in QGIS, I get error. What is the reason?

I use QGIS3.0 in linux(ubuntu 16.06 LST). And whenever I try to use saga toolbox, I get some error like image. I select "save to temporary file". What is the reason? please help me.
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0answers
371 views

SAGA functions not writing output raster using QGIS 3? [closed]

I'm using QGIS 3.0, using a SRTM 1 Arc Second to perform hydrological analysis using some of SAGA functions (such as Fill Sinks), if I choose temporary output, it works fine; if I choose to save to ...
0
votes
1answer
521 views

QGIS saga supervised classification [closed]

I'm using QGIS 3.0 with the expanded SAGA options. I created a training file in SAGA standalone that I am using, but would prefer the GRASS kappa comparasion options. I have already performed the ...
12
votes
1answer
4k views

Is there any way to include “universal” style/symbology in GeoPackage?

I am just playing with the GeoPackage format in QGIS. In QGIS it works nice with the style saved from QGIS but if I load it for example in SAGA the style is not applied. Is there any way to include ...
2
votes
1answer
190 views

SAGA landform classification crashing on MAC, Windows, standalone or with QGIS

I am trying to apply the "TPI-based landform classification" algorithm from SAGA. Originally in QGIS 2.14, on a MAC, then on windows and with SAGA standalone, but it quickly saturates memory/CPU and ...
0
votes
1answer
89 views

Using folder name of output file inside SAGA GIS Algorithm with PyQGIS?

I want to execute an algorithm using SAGA GIS. I am using the following Python code. outputwinddata_asc = "W:/04 Tools/07 MapMaker/workingfiles/Thailand_Rectangle2_DTU50m.asc" outputwinddata_asc1 = "...
1
vote
0answers
243 views

Sum multiple raster layer under condition

For a suitability analysis I need to sum up three raster layers a,b,cconsidering different conditions. let's say, output layer is d. I'd prefer Open Source Software, particularly QGIS (with SAGA, ...
3
votes
1answer
996 views

Conditionally combine two raster with raster calculator

I can’t figure out how to do this in QGIS. I tried gdal and SAGA raster calculator in QGIS. Here is the situation: I have two raster for the same area in the same projection with the same extent and ...
4
votes
1answer
1k views

QGIS running on Windows XP says …\saga_cmd.exe is not valid Win32 application?

I installed the 32-bit version of the latest QGIS (2.18.16) and get this error message when loading restored plugins: C:PROGRA~1\QGIS2~1.18\apps\saga-ltr\saga_cmd.exe is not a valid Win32 ...
1
vote
1answer
676 views

Soil Texture in SAGA, GRASS and R [closed]

I am trying to get a map with the type of soil depending of their texture. I have tried three options: In SAGA. By using the tool "soil texture classification" where by using three raster with the % ...
1
vote
1answer
322 views

Defining extent of SAGA proximity algorithm output

I try to calculate raster distance to restaurants using proximity in QGIS. I have the following data: Binary Int Raster with restaurant location Perimeter Shapefile Using QGIS GDAL Proximity, I ...
4
votes
1answer
388 views

How to create hillshade models every hour for a zone with GDAL

I´m trying to calculate the hillshade models from a zone for every hour during one month. I´m using the GDAL, gdaldem hillshade (I don´t know if there is another tool/library). The problem is how to ...
1
vote
1answer
200 views

Rasterize Vector MultiLine

I try to rasterize a multiline data set (streets) from a PostGIS database using QGIS 2.18 and SAGA GIS rasterize tool. I managed to differentiate between street and not street but I'd need to ...
2
votes
0answers
1k views

Multiple Linear Regression Analysis in QGIS (with SAGA Toolbox)

I'm attempting to run a multiple linear regression analysis using QGIS, through the SAGA toolbox. However, the QGIS UI does not allow me to choose predictors -- it seems entirely absent from the UI. ...
2
votes
1answer
338 views

How to close open files after processing.runlag() command (Qgis: Error No 24)

I'm creating a pyqgis script. In this script I use the processing.runalg command several times. The problem is that these processes are within a for loop. After several iterations, the error number 24 ...
0
votes
2answers
437 views

SAGA disappears from QGIS 2.18.14

I upgraded QGIS from 2.18.0 to 2.18.14 but I losted Saga in processing tools. First I tried to disable/reactivate it in processing > options > providers but nothing. I searched some solution on web ...
1
vote
1answer
220 views

Did SAGA tools get slower?

after a while I have updated my QGIS to 2.18.15 and I have noticed that some saga tools run very slowly. Some months ago I used the saga multilevel b-spline interpolation tool and it runs very fast. ...
2
votes
1answer
368 views

Display the output generated by saga ordinary kriging on to QGIS from Python Plugin

I wanted to call kriging algorithm from a python plugin and displays it's output on QGIS desktop. I have successfully generated the output of the kriging algorithm by unable to find the steps which ...
0
votes
0answers
697 views

Preparing SRTM (hgt) for use in SAGA GIS?

I am trying to prepare a raster file which i could use with SAGA processing tools for hydrologic analysis in QGIS. I am using Win 7, 32 bit, QGIS 2.14.20 and SAGA 2.3.2 I downloaded the srtm file in ...
2
votes
1answer
329 views

“Grid” menu is missing from SAGA on my QGIS 2.18 setup

I am just a learner and learning through internet tutorials. I tried to learn about SAGA tools specially for "Grid" options, but I am unable to see any menu icon of Grid on SAGA toolbar. I am ...
3
votes
0answers
374 views

How to properly calculate annual irradiance using QGIS

I want to calculate annual irradiance for a couple of buildings to establish how much PV energy can be potentially harvested. Which algorithm You recommend for this purpose: "r.sun" from GRASS ...

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