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
0answers
25 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....
2
votes
1answer
57 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, ...
0
votes
2answers
69 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 ...
0
votes
2answers
40 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
0answers
26 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 ...
1
vote
1answer
47 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
1answer
173 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 ...
0
votes
0answers
14 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
40 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, '...
17
votes
5answers
6k views

Manually correcting raster DEM (OpenSource)?

Is it possible, to correct a raster DEM by changeing the raster-cell-values manually, like by "painting"? My DEM (ASTER) have one small error where the elevation is about 300m below the actual ...
0
votes
1answer
34 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 ...
31
votes
8answers
36k views

How to set all pixels with value <= 0 to “nodata” in DEM raster?

I have a DEM raster with pixel values between about 3000 and -0.0003. I need to set all pixel with a value of 0 and smaler (<=0) to "nodata" (for later raster calculations and to reduce the ...
8
votes
4answers
755 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
0answers
24 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 ...
3
votes
1answer
508 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 ...
2
votes
1answer
298 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 ...
1
vote
1answer
78 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. ...
0
votes
0answers
8 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
15 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 ...
3
votes
2answers
212 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)?
2
votes
1answer
51 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
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
40 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 ...
-1
votes
1answer
109 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
25 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 ...
1
vote
1answer
124 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
92 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 ...
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. ...
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, ...
2
votes
1answer
270 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
0answers
34 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
1answer
41 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 ...
0
votes
0answers
14 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
53 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 ...
3
votes
2answers
2k views

SAGA installation in QGIS 2.8 on debian linux

I install QGIS 2.8 in debian (linux) through nightly jessie (qgis testing) and I see that SAGA is not in processing toolbox, so I install saga gis software but still it doesn't appear in processing. ...
0
votes
0answers
38 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... ...
1
vote
0answers
252 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 ...
1
vote
0answers
102 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 ...
0
votes
0answers
20 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 ...
3
votes
0answers
44 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 ...
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?
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?
0
votes
0answers
40 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 ...
0
votes
0answers
35 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
0answers
18 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
66 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
95 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 ...
42
votes
5answers
2k views

Generating equal sized polygons along line with PyQGIS?

I would like to create polygons along a line to use them for AtlasCreator in a next step. ArcMap has a tool called Strip Map Index Features. With this tool I can choose the height and width of my ...

1
2 3 4 5
11