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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++.

Web site: http://www.saga-gis.org

629 questions
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Automating non-trivial workflow in SAGA-GIS

My problem: I have two DEMs, one rectangular and containing the other. Both are given in grid formats and the outer one has gridsize 50m, the inner one 10m. I want to 'embed' the smaller one in the larger one, merge them and export the whole merged…
Sh4pe
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saga_cmd option for mosaiking tiles

I am looking for an example of how to mosaik DEMs together using the SAGA command line. Specifically, how to indicate the list of DEMs that you want to merge. I found saga_cmd grid_tools 3 -GRIDS [-TYPE ] [-INTERPOL ] [-OVERLAP…
Esme_
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Writing SAGA_CMD command line formatting

I am trying to use SAGA_cmd to write a script that does the following: The united 1) Reads a series TIFF files I have in the work folder; 2) Runs a segmentation on the TIFF files on each respective file, and; 3) Outputs the corresponding…
user2507608
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Why do I get this anomaly (vertical line) in my TWI raster?

I have derived TWI using SAGA GIS, Have a look on the center of the image, a vertical line goes through it from top to bottom. Anyone else confronted this issue?
Rex
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What unit is the topographic openness (SAGA GIS)?

The SAGA GIS tool "Topographic Openness" calculates the positive and negative topographic openness and is based on Yokoyama et al. (2002) who do not specifically say the unit of the final result. They refer to intermediate angles as > or < 90°…
Soalpa
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Where are GRID algorithms in SAGA 2.1.4?

I am a real newbie on QGIS and wanting to draw contour maps from satellite, following the youtube videos. So now I have a table with all data, and following the video, I should use the SAGA tool GRID (natural neighbour) tool but can't find it on…
Joao Serras Pereira
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Import .tif file in SAGA GIS

While importing the .tif file through Geoprocessing -> File -> Grid -> Import ->Import Image, I am getting the following error in SAGA GIS 7.8.2. 12:27:37 PM: Unknown field with tag 33550 (0x830e) encountered (in module "TIFFReadDirectory") 12:27:37…
GIStree
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The number of supplied grids is less than the number of variables in formula

I'm completely new to SAGA. The documentation is really rough with me, and there are not many examples around, so I try to fly by instruments. I tried this: saga_cmd grid_calculus 1 -GRIDS 011x002-corrected.tif -FORMULA 'g1/cos(ypos()*pi()/180)'…
Marcos Dione
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Calculating Saga Wetness Index from LiDAR-derived .ASC files in RSAGA

I am trying to run SAGA Wetness Index on a large number of .asc files that were derived from 1-m LiDAR. Due to the large size/amount of data (each .asc file is ~1000 MB and I have ~685 files), I would really like to avoid having to convert the file…
xtina
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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 and all is well with that; Installed R and RSaga in…
David
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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…
Simon Hirschhofer
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SAGA_CMD: select polygon features of one shapefile and save in new shape files

I want to use saga_cmd to select from a shapefile only the shapes, which have a certain area size and store this selection into a new shapefile. I'm using the following command to filter via the respective area size: saga_cmd shapes_tools 3…
Marcus
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How to delete by attribute from shapefile in SAGA command

I have lot of shapefiles to erase polygons with same attribute form them. It is usually an easy task when do manually, but how can I use SAGA-GIS command? Any help?
Tom
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Exporting 16 bit single-band to 8 bit in SAGA

Is there any possibility exporting 16 bit single-bands to 8 bit like in qgis (gdal_translate)? Additionally in SAGA there is no option to save raster with rendering, right?
Thelema
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Outputs of Slope, Aspect, Curvature SAGA tool

I'm trying to calculate slope, aspect and curvature from a DEM with the "Slope, Aspect, Curvature" tool provided by SAGA. To accomplish this, the tool gives different methods to calculate the slope, but the outputs differs according to the…
Andres_alfp
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