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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Calling SAGA modules through GRASS run_command in a script PYTHON

Does someone have an experience|example of calling modules of SAGA with the grass.run_command method in a script written in PYTHON?
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Saga GIS at command line in OSGeo4W - 'shapes to grid' tool - sqlite input

I have been using the Saga 'Rasterize' plugin in QGIS to rasterize spatial data from sqlite format (road networks, and intersections) to tiff. I find this tool more flexible than the gdal_rasterize ...
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104 views

Problems with weighted overlay on QGIS for Mac

I am a beginner on GIS seeking to finish a suitability analysis. For this I was planning to use 'vector to raster' tools as well as a 'weighted overlay analysis' to find the most suitable areas. I ...
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104 views

How to do regression analysis in SAGA for topographic correction

Currently I am trying to do the topographic correction using C-Correction. I would like to know if there is a way to do the regression analysis between L (uncorrected reflectance of each band from ...
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84 views

QGIS mac: Problem running several algorithms from toolbox

I want to use the SAGA algorithm "add coordinates to points", but I get an error message: Algorithmus Add coordinates to points startet... shapes_points "Add Coordinates to points" -INPUT "/var/...
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177 views

QGIS for mac acting strange after upgrade to 2.16

I'm running OSX 10.10.5 and just upgraded QGIS from 2.14 to 2.16. 1st. the installed GDAL 2.1 wasn't registering when using gdalinfo --version. It still showed 1.11... So I used MAPBOX GUIDE to get ...
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24 views

Tiger WOIS Could not open workflow

Recently I have been trying to use the TIGER WOIS package which looks really useful. I'm trying to use the Flood mapping tool with Sentinel-I data, but I encountered a problem right away. In the ...
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237 views

Georeferenced Image Overlay and export to new image

I have two Geotiffs (one satellite image, one clipped image). I want to put the clipped image over the satellite image, because it shows flow velocity from this shown glacier (see image below). I ...
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How is “flat” defined in SAGA

SAGA has a feature that determines flats. Does anybody know how they define a flat? If I start with a raster, each pixel is flat - so it has to be more sophisticated than that. I would like to be ...
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340 views

QQIG/SAGA “merge shapes layers” algorithm removes underscores/pluses from layer names

I have a bunch of layers that are named layername_number+number that I want to merge. I need their names as source attribute so I used the "merge shapes layers" algorithm found under SAGA in the ...
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114 views

GRASS and SAGA CentOS Linux release 7.1.1503 (Core)

I have a problem. I am developing a standalone app using QGIS but my script imports GRASS nad SAGA plugins and I have error to create the maps. I have CentOS Linux release 7.1.1503 (Core). SAGA is ...
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209 views

Put output of SAGA algorithm of Processing model in R script

I'm trying to combine the Variogram Cloud model of SAGA with an R script inside a Processing model. First, the R script is: ##Vector processing=group ##showplots ##Layer=table ##X=Field Layer ##Y=...
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254 views

SAGA GIS - raster image from Civil 3D

I am a new user of SAGA GIS software. I need to interface the Civil 3D 2015 and Hec Ras software in order to create a flooding map. In order to put in communication the two softwares, I have to use ...
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95 views

What is the background processing of rainfall thresholding?

I want to create a flood map using Quantum GIS. First of all I create catchment area (flow accumulation). Then, I delineate a Channel Network by applying a threshold to flow accumulation. So I want to ...
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723 views

How to calculate the Vertical Distance to Channel Network in ArcGis?

In Saga there is the tool "Vertical Distance to Channel Network". Is there a way to produce the same data in ArcGIs? With con("flowacc" > xx, 1) I was able to create the Channel Network. I am ...
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343 views

QGIS processing framework SAGA NaturalNeighbor in external Python Script - No Output

I want to build a little script, which generates a NaturalNeighbor grid based on a point Shapefile. The script runs within my PyDev environment without any error messages, but no outputfile is created....
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94 views

Exporting landcover clasiffication from ENVI to SAGA

I have basic knowledge in remote sensing and GIS. I have generated landcover map in ENVI 4.7. How can I transfer or Export/Import this into SAGA so that I perform other functions in SAGA. I want to ...
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86 views

Error SAGA algorithms in Modeller QGIS 2.2

I am using QGIS Modeller and I try to use SAGA algorithms but it doesn't work. GRASS algorithms work just fine but SAGA doesn't. I am not sure if I have to configurate something. What is worng?
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177 views

Is the SAGA tool Basic terrain analysis included in Processing?

I can't find the saga tool Basic terrain analysis in the Sextante/processing toolbox. Is this not included or is there a chance to install it?
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181 views

Problems with SEXTANTE

maybe the answer is somewhere, but i can't find it right now... I'm getting problems with SEXTANTE and algorithms with GRASS, SAGA... Always is the same, they can't open the files, the error is the ...
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103 views

How to Configure sextante in Qgis 1.9 ubuntu

I am using Ubuntu 13.04 and the most up to date version of Qgis 2.1.0-Master. I am trying to get sextante to work correctly and have a hard time. Specifically SAGA 2.1.0 and GRASS 6.4.2 will not ...
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767 views

QGis Grid statistics for polygons error - Module caused access violation!

I'm trying to calculate statistics for a raster layer using an overlaying polygon layer, I'm using SAGA "Grid Statistics for polygons" function, but it returns an error, sadly.. So in the sextante log ...
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600 views

OGR VRT MSSQL example

I'm trying to import vector data into SAGA GIS from a SQLExpress 2008 server. Firstly is this possible? I would have thought using an OGR VRT layer would have been the way to do it, I've attached a ...
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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 ...
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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 ...
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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 ...
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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 ...
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28 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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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 ...
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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 ...
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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... ...
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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 ...
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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 ...
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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....
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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,...
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76 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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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" ...
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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 ...
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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 ...
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33 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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30 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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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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60 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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264 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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98 views

Generate stream network for every pixel of flow direction as a polyline shapefile based on the raster cell value

I have a flow direction raster (coded with ESRI flow directional encoding scheme) and I want to generate stream network for every grid cell of flow direction raster as a polyline feature based on the ...
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273 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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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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644 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 ...
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101 views

Copying coordinate system and extent from a TIFF to a polygon shapefile in SAGA GIS

I used R to batch process object based image segmentation on some geoTIFF files using rgdal to communicate with SAGA GIS. I got the resulting shapefiles, all with the following properties: Projection ...
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586 views

Merge raster layers error

Is there an issue with the SAGA-tool "Mosaicking rasters"? I tried it with different rasters. In Sage itself it works fine. Algorithmus Mosaick raster layers startet... io_gdal 0 -TRANSFORM -...