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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82 views

QGIS SAGA Overland flow distance to channel network not working

I am trying to run the QGIS SAGA tool "Overland flow distance to channel network" with a DEM and the channel network raster developed from this same DEM using the SAGA tool "Channel network." However, ...
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2answers
201 views

Using SAGA GIS 7.X modules in QGIS

Is it possible (and how) to use the SAGA GIS 7.x modules in QGIS (as well as for GRASS GIS)?
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248 views

SAGA: could not initialize data objects (QGIS 3.6, Mac 10.14)

I was trying to generate a catchment area from a DEM and got the error message: The following layers were not correctly generated.<ul><li>/var/folders/ft/rbsnpzy96r76t8rkj5fdtzc40000gn/T/...
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1answer
26 views

Using Formal Class RasterLayer as RSAGA input and otput

Is there a way to use the data from the R global environment object as input for an rsaga.geoprocessor alghoritm? And if yes, can be the output also saved as a same object? I am writing chain ...
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0answers
57 views

VRM tool QGIS error generating layer

I am trying to use the VRM tool in QGIS of the SAGA package. Every time I get an error message: layers could not be generated. I tried different input rasters (DEM and DTM) and kept other settings ...
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1answer
160 views

Error creating DEM with Nearest Neighbour tool in QGIS?

I have an issue when I am creating a DEM with the tool natural neighbour on QGIS. When I extract my data directly on Qgis I have no issue creating a DEM. My points are coming from different sources ...
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0answers
93 views

Inaccurate raster values from “SAGA Extract Raster Values to Points”

I am perplexed by the results generated by the SAGA 2.3.1 Extract Values to Points tool in QGIS 2.18. I am working with Vegetation Index raster layers, which means the values are between -1 and 1. ...
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1answer
480 views

Sentinel-1 SAR image is displayed upside down

I am looking at Sentinel-1 SAR image downloaded from ESA Copernicus - dhus location around south of Tokyo, Japan. File format is GeoTIFF. It looks good in QGIS. However, if I use SAGA, or SNAP, or ...
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39 views

No SAGA folder in processing options dialog box

I am using QGIS 2.18. I am facing this error while using EasyAHP: "The error occured during calculation. Please make sure that Processing Toolbox's SAGA provider is installed." But, I guess the ...
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2answers
152 views

Is there an equivalent to “keep inner boundaries” in QGIS 3?

At QGIS 3.4.7, I have some polygons that are overlapped and I use Polygon dissolver (by attribute) from SAGA to dissolve then and I check the option "keep inner boundaries", but this tool takes too ...
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1answer
93 views

Cheapest path through polygons and lines from point to point

I want to find the cheapest path or the least cost path from one point to another point. The points are part of a vector map and do not lie on a network. All features being part of the map have ...
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1answer
151 views

Raster Volume Returning Wrong Volume

I have a clipped surface using Washington State Plane North (feet) added to a QGIS project using the same CRS. I am trying to calculate the area under this surface (a dirt pile) using SAGA Raster ...
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3answers
223 views

Converting raster pixels to vector cells?

Is there any way to convert raster pixels to vector cells? I mean each pixel to a polygon. I tried the SAGA tool 'Raster values to points' by choosing cells option instead of nodes option. As a ...
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0answers
109 views

Extracting GeoTIFF colours and adding to equal geometry shapefile

I have the following map in .png-format that I would like to replicate, but I cannot obtain the original data. The map shows the current water supply vulnerability for local municipalities in South ...
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1answer
342 views

Analytical hierarchy process tool - SAGA. How to configure Pairwise comparisons table?

What is the configuration and extension (.txt, .csv ...) of the Pairwise comparisons table file requested by the SAGA AHP tool- Analytical Hierarchy Process - in QGIS? Are there examples of ...
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1answer
237 views

QGIS 3.4 Stream delineation problem, lines running too far into ocean

I am using QGIS 3.4.4 Madeira version trying to delineate the stream and catchment areas of a small Bay in Honduras based on the technique of Hanz van der kwast tutorial "Stream and Catchment ...
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1answer
180 views

Getting QGIS Model Processing Raster Calculator Error?

I am using "raster calculator" tool of the saga in my model. The tool correctly executes raster operation like "a * 2" in value formula option but the same expression is not executed pre-calculated ...
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1answer
130 views

Relief Segmentation Tools, SAGA

Where can I find documentation on the tool Relief Segmentation of the library Terrain Analysis?
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2answers
322 views

QGIS SAGA functions failing “… following layers not correctly generated. …” [closed]

I've been having an issue with the SAGA functions for a while now, I believe since upgrading to one of the early 3.x versions. No matter which function I use they all fail with the same error (...
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0answers
90 views

Error using SAGA raster creation tools. Input layer error: points?

I have a shapefile containing x,y,z values as a point vector layer. I want to interpolate these points to create a DEM. For that I use SAGA natural neighbour algorithm. However, I am not successful ...
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1answer
996 views

QGIS 3.4.4 and 3.6 SAGA Tools all not working with same error

C:\OSGeo4W\bin>exit Execution completed in 12.17 seconds Results: {'SHADE': 'C:/QGIS/output/HS.sdat'} Loading resulting layers The following layers were not correctly generated.C:/QGIS/output/HS....
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0answers
165 views

SAGA 2.3.1 makes QGIS 2.18 crash on Ubuntu 18.04 [closed]

On Ubuntu 18.04, using packages provided by universe repos QGIS 2.18.17+dfsg-1 SAGA 2.3.1+dfsg-3build7 When starting any SAGA algorithm, QGIS crashes with a "Segmentation fault" error message. We ...
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1answer
367 views

LS Factor in SAGA (slope units)

In which units do I have to calculate Slope to use as an input for the LS Factor tool in SAGA (degrees, %, radians)? I couldn't find anything in the documentation.
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1answer
76 views

Piping one SAGA Raster Calculator output into another chaining algorithms in QGIS processing script?

I am using QGIS 2.18.15. I want to streamline multiple SAGA raster calculator calculations using the output of one calculation (not loading it into the table of contents) as input raster for the ...
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1answer
214 views

SAGA Raster Calculator in QGIS Algorithm script produces 'NoneType' object has no attribute 'crs'

I would like to produce a new temporary raster after a calculation with the SAGA raster calculator using a custom python algorithm script. This is my code so far: ##MaechtigkeitunterhalbeinerHoehe=...
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1answer
2k views

Layers not correctly generated using SAGA algorithms within QGIS 3.4.4-Madeira

I am trying to use a few algorithms that may be useful for my work, that are part of the processing tools packaged with the latest LTR 64-bit version of QGIS in Windows 10 64 bit.. However, all of the ...
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1answer
35 views

SAGA Raster Calculator processing script give error “name 'Rasterout' is not defined”

I am trying to build a custom script using things I have learned from this post: Number inputs as raster calculator variables in QGIS Modeler This is my script so far: ##Maechtigkeit unterhalb einer ...
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0answers
105 views

How to write raster in saga format with python

I try to write a raster file in SAGA GIS format (sgrd). My script is work but some information is missing in the final file (i.e output.sgrd). Here is script : from osgeo import gdal, ogr, osr import ...
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0answers
80 views

Calculating maximum extent of debris flow from point with mean slope value

At a very large scale I perform a spatial analysis for which I have to apply mean slope criteria. These criteria allow me to calculate the maximum extent of an event (debris flow). I know that below a ...
2
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1answer
252 views

Using SAGA GIS for TPI classification?

I processed one country with TPI, and I got a certain Landforms classification of terrain. (Topographic Position Index (TPI) calculation as proposed by Guisan et al. (1999)). When I processed only one ...
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1answer
520 views

SAGA hydrology toolbox Error: select a library

I am having trouble getting the SAGA hydrology toolbox running. Here when I try to fill sinks in the DEM a series of errors are flagged in the log file. This includes for 'select a library', 'DEM' and ...
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1answer
290 views

Unable to perform SAGA point snapping to line on Win and Mac

I have been trying to snap points from a shapefile to a line feature from another shapefile. However, each time I do this, I get the following error(s) (depending upon the OS used): (For OSX El ...
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1answer
57 views

How to connect polygons to make a circle?

I created polygons from a raster on which I ran an edge detection filter. I turned the edges into a polygon layer (multipart splitted into single parts). The intention was to have circular polygons at ...
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1answer
79 views

How to add multiple layers to SAGA map view at the same time?

I need to visually interpret more than 50 grids, so I want to add them all to a SAGA map at the same time. If I right-click on a single layer, I can "Add to Map", but with multiple, this option is not ...
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0answers
241 views

Problems with SAGA on QGIS

I'm trying to perform an interpolation on SAGA in QGIS but every time I ran the tool (or any other SAGA tool for that matter) I got the following message: "The following layers were not correctly ...
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0answers
284 views

Error when running SAGA interpolation

I am running the nearest neighbour algorithm in QGIS 3.4.3. I have tried various parameters but the problem persists. I have also tried other algorithms (simple Kriging) and had the same problem. ...
2
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1answer
185 views

RSAGA error using rsaga.pisr2

I just downloaded SAGA and the RSAGA package for R. I would like to use the rsaga.pisr2 function to compute solar radiation for my region of interest. I am currently getting errors related to proj4 (...
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1answer
77 views

Adding two rasters in modeller

I'm trying to build a process model which uses a series of raster operations - Rasterize, Proximity, Raster Calculator. However, I couldn't seem to add two consecutive raster calculator processes. ...
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1answer
596 views

point thinning/point selection based on distance threshold in QGIS/GRASS

I need to thin a point vector later based on the distances amongst points. So I have a threshold and wish to omit all records but one that is below a distance D representing a distance between points. ...
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0answers
95 views

Promoting to multipart using PyQGIS?

I am creating a code that aggregates neighbouring polygons if they have similar value on the field 'DN' and if they are closer than 50 m.Then I want to iterate this 3 times. I could already get the ...
4
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1answer
504 views

Choosing parameters for SAGA Wetness Index?

I've been working with SAGA GIS to calculate the Topographic Wetness Index of an alpine catchment. I am using the tool Terrain analysis > Hydrology > SAGA Wetness Index because, compared to ...
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1answer
407 views

Clustering spatially connected polygons so all clusters have approximately the same size

I want to group together polygons from a shapefile a way that all the clusters formed contained approximately the same number of polygons. The problem is that the source polygons have vastly ...
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1answer
213 views

QGIS 3.2 SAGA Raster Values to Points: ERROR: Missing Parameter Value

When I try to run the saga:rastervaluestopoints tool in the QGIS 3.2 Python console it returns the following error (see below). I can't figure out what's going wrong. The tool works when running it ...
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0answers
69 views

SAGA_CMD.exe Bad image

In QGIS 3.0, 3.2 and now 3.4 I get the following error message saga_cmd.exe bad image C:\windows\system32\vcomp140.DLL is not designed to run on Windows or contains an error. I didn't have the ...
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1answer
51 views

How to merge pixel values to the nearest maximum value based on area in a classified raster?

We have a raster image with 9 discrete values. Generated the image using SAGA's Terrain Analysis -> Morphometry -> TPI classification technique. Now, like to merge pixels which occupy certain area (...
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2answers
259 views

Seeking for a solution to convert GeoTIFF to 3d WKT

I am trying to convert some DEM in .tif image to polygon geometries representing 3 dimensional triangles that is Well-known text (WKT) - 3D (x, y, z) I was able to use SAGA to convert my GeoTIFF ...
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0answers
39 views

Python function like SAGA Grid Gridding?

For a python script, I'm searching for a function that does the same as SAGA Grid gridding, an exponential interpolation on GeoPandas GeoDataFrame. Does anyone know one?
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1answer
250 views

Load a SAGA RGB composite in QGIS

I have created a RGB composite in SAGA GIS using the RGB composite tool. A one band raster is created, which can be visualised in SAGA using the option RGB coded values. When I try to import this ...
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1answer
150 views

Not correct numeric value error using Multilevel B-Spline interpolation with SAGA and QGIS?

This is the generated log: Processing algorithm… Algorithm 'Multilevel b-spline interpolation (from raster)' starting… Input parameters: { 'DATATYPE' : 0, 'EPSILON' : 0.0001, 'GRID' : '/Users/...
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0answers
274 views

Avoiding artefacts by pixel filtering in a raster

I have a DEM with a spatial resolution of 2 meters with a lot of areas with no data. I want to fill those gaps in order to use the whole DEM. I used the 'close gaps' tool in QGIS (it's a SAGA tool) ...

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