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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3
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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 ...
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2answers
292 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 ...
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0answers
39 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 & ...
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0answers
179 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
122 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
364 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
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1answer
472 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 ...
9
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1answer
3k 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
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1answer
165 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 ...
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1answer
83 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 = "...
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0answers
202 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
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1answer
780 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
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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
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1answer
568 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
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1answer
268 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
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1answer
316 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
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1answer
166 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
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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
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1answer
274 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
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2answers
429 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
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1answer
194 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
351 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
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0answers
638 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
293 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
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0answers
329 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 ...
1
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0answers
592 views

Saga 2.3.2 fill sink

I am trying to run the saga fill sinks (wang &liu) but it always results in following error "'NoneType' object has no attribute 'crs' See log for more details". I am using QGIS 2.18.12. I am ...
0
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1answer
98 views

PyQGIS - Saga Channelnetwork

I am trying to run this from QGIS python console to extract the channel network from the DEM, based on the catchment area: processing.runalg('saga:channelnetwork', 'C:/Data/filled.tif', None, 'C:/...
13
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1answer
916 views

Irradiance analysis - GRASS vs SAGA significant discrepancies

I wanted to calculate and visualize the irradiance values for a plot. Do not know why, but in my copy of QGIS 2.18.5 I am missing appropriate SAGA module in the "Terrain Analysis -> Lightning", so I ...
0
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1answer
496 views

Determine the flow direction from a point in a DEM [closed]

I had a quick look of the other questions about hydrology using a DEM (SAGA/ArGIS) and I guess I need to calculate something different from a traditional flow accumulation/channel network/catchment ...
1
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0answers
191 views

pyqgis standalone script Unable to execute algorithm Input layers do not have the same grid extent

I created a simple pyqgis standalone script and I have some errors with some datasets and I don't know why some times the script works fine and other times the script gives an error : TypeError: '...
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0answers
172 views

Topographic correction in QGIS SAGA error: Input layers do not have the same grid extent

I have sentinel-2 layer images and one TIN image. I resampled the TIN to same spatial resolution in Layer 4 (10m). Both images are in the same reference system. But when I try to perform topographic ...
3
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0answers
415 views

How to calculate the distances to outlet along the flow path ?

I have created these raster files for a river basin: DEM Flow Direction Flow Accumulation I like to genereate a layer how it is shown in the picture below. I need the values for the distances from ...
3
votes
1answer
799 views

SAGA IDW interpolation algorithm has been changed?

Yesterday, I try after a long time to make an IDW interpolation on a point layer in Qgis 2.18 with SAGA tools. I use same parameters as before on Qgis 2.14, but the result is quite different. Raster ...
2
votes
1answer
250 views

SAGA Slope Stability algorithms missing in QGIS 2.18.11

I have install QGIS 2.18.11 via OSGEO4W 64 bit (that programs and versions install with QGIS SAGA version 2.3.2 GRASS version 7.2.1). I can use SAGA algorithms without problem in QGIS using processing ...
3
votes
1answer
637 views

Set path to SAGA from QGIS on OSX

After a crash and subsequent reinstall I cannot access SAGA GIS in the processing toolbox, and it appears that QGIS can't find it as there is no setting for the path. How can I set the path from ...
1
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0answers
922 views

QGIS-SAGA Add Raster Values To Points How to apply update

I have a lattice of points. I have a surface model. Both layers share a CRS. I am trying to populate the point file with the values from the underlying raster using the SAGA tool Add Raster Values ...
18
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1answer
761 views

Determining flow path length in QGIS?

I need help with qgis flow path length. I try to run the program and when I run the program I get a raster with 0 values, as input I'm using filled raster, I don't now if I'm doing something wrong or ...
3
votes
1answer
417 views

Using the field calculator in SAGA-GIS

I am working with SAGA-GIS and need to create an euclidean allocation raster. For this, I need to first create an integer raster with values for certain areas. This integer raster shall be based on a ...
2
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0answers
329 views

Using SAGA and GRASS on macOS Sierra?

I am trying to run QGIS 2.18.13 on Mac OS Sierra (10.12.4), but I'm having problems with SAGA and GRASS, at least from processing. Here's what I did: Installed QGIS from brew, but ended up having ...
4
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2answers
9k views

How to delineate watersheds in QGIS?

I am using qgis 2.14.17 with ubuntu16. Having as input data a DEM of the region and a river network. In the manual of qgis they suggest to use a toll of qgis: Catchment area (Parallel); I dont have ...
1
vote
1answer
263 views

SAGA raster calculator, ifelse command syntax problem

I would like to combine two raster in Raster calculator of Saga. With raster calculator of QGIS , I have no problem, but with ifelse command syntax of Saga, the operation don't run. The operation is :...
2
votes
1answer
681 views

Error in catchment area calculation

I downloaded a DEM based on the ASTER Global Digital Elevation Model (resolution 30 m; ASTGTM2_N42W009_dem.tif) from the Earth Explorer website (https://earthexplorer.usgs.gov/). I am trying to ...
10
votes
2answers
11k views

How does Zonal Statistics work exactly?

I'm a bit confused on how the zonal statistics tools work in QGIS (either the 'Zonal Statistics' tool under the Raster tools from the QGIS geoalgorithms toolbox or the 'Raster statistics from polygons'...
3
votes
1answer
1k views

Legend of Flow Direction calculated with processing toolbox QGIS (SAGA)

I tried to figure out the legend of the output for flow direction when I use the QGIS processing toolbox function from SAGA (Channel network and drainage basin). I get a raster with values from 0 to 7....
1
vote
1answer
498 views

SAGA command line not working

I'm trying to script a reclassification using SAGA Grid_Tools-Reclassify Grid Values tool but I'm having the error: Reclassify Grid Values: could not initialize data objects. I've tried different ...
1
vote
1answer
259 views

DEM, points values and elevation to create a map of temeperature

I am using SAGA - Universal Kriging (Global) for this, but I am stucked. I have grid (.tif) for Serbia with elevation values, and .shp file with points that have mean yearly temperature. I want to ...
2
votes
0answers
477 views

SAGA Raster Mosaic Issue with output (projection/not showing)

I am trying to create a mosaic from a couple of georeferenced raster images (old aerial photos) using the SAGA mosaic raster layers function from the QGIS toolbox. Project and layers are all on the ...
6
votes
1answer
704 views

Delineating coastal subbasins using SAGA GIS or GRASS in QGIS?

I'm having some problems trying to delineate watersheds using the SAGA watershed delineation tools in QGIS. I have a SRTM DEM (cell size 30 m) which I set the water cells to NULL values, following ...
2
votes
0answers
209 views

Use SAGA from within QGIS on mac osx

I am trying to use SAGA from within QGIS. I can run SAGA standalone, but not from within QGIS - nothing appears in the Processing Toolbox. I tried following Why is SAGA from the Processing Plugin ...
1
vote
1answer
547 views

Using Raster calculator SAGA PyQGIS

I'm trying to plus two raster images through the python interface of QGIS, i want to use the saga raster calculator, but i got one error but i don't know why: i'm doing the following calculation (the ...

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