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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10 views
How do you read GeoTiff-file in SAGA GIS Program?
I'm very new with all GIS-stuff and I got advice that SAGA GIS would be a good program to start with. I would like to read a GeoTiff-file in SAGA, but I can't find an "import file"-function x)
Any ...
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1answer
23 views
How to open a .k format (I think it is made with IDRISI product) with open source software
I just received a .k file which I know it was made with a IDRISI software (i do not know which). I serched the web and I did not find many information on this format a part for a very essencial page ...
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0answers
48 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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1answer
61 views
saga & grass configuration in sextante (ubuntu)
I have some trouble in running saga and grass algorithms in sextante. When I double click it appears a pop-up saying:
Missing dependency.This algorithm cannot be run :-(
This algorithm requires SAGA ...
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113 views
Topographic Wetness Index
Is there any option to SAGA to calculate the Topographic Wetness Index ?
I have a big area and I tried many times with SAGA, the last time I thought the results was ok (before SAGA would crash or give ...
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1answer
147 views
How to fix erros loading result layers from SAGA functions in Sextante?
Using QGIS 1.8.0 and SAGA When trying to use the IDW function from Sextante SAGA 2.1.0 64bit, I get the following error: Could not load layer: C:/test.tif.
This error seems mysterious to me, any ...
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2answers
44 views
SAGA, GRASS Raster values to null
I want to make the cells which values "1" to null in QGIS with Grass or Saga tools (exactly Saga).
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25 views
How to fix the SAGA driver is not writing statistics to .sgrd file?
I am converting .img files to .sdat (SAGA) with GDAL 1.9.2 in command line.
SAGA driver is not writing statistics to .sgrd file (min, max, mean), which complicates use SAGA_CMD in batch mode (SAGA ...
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1answer
53 views
Differences in raster extents in gdalinfo, SAGA & Quantum after resampling
I recently resampled a raster file using SAGA's Resampling module. The aim was to widen the extent of the new raster to two decimal places, where the original raster has three decimal places. The ...
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2answers
46 views
How to align directions of connected lines?
I have a vector line made of different pieces of lines with different directions. I merged the lines to one. But this merged line still have different direction in its "invisible" parts. I want to ...
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78 views
Free and Open Source GIS Desktop Dissertation Survey – Participants wanted [closed]
I am currently in my last year of MSc Information Technology course at the University of the West of England. I am required to undertake a dissertation project. I am conducting a study on the level of ...
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1answer
57 views
Determining Pixel-by-pixel Catchments in ArcHydro
I used ArcHYDRO to prepare HydroDEM (5m) without sinks, Flow direction (FDR) raster, flow accumulation raster (FAC). As I understand FAC, value of pixel shows number of pixels that contribute to this ...
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27 views
ERROR 1: Couldn't create FITS file C:/test.tif (105)
Does anyone know that error:
C:\Program Files (x86)\Quantum GIS Lisboa>saga_cmd io_gdal 1 -GRIDS "C:\Users\Max\AppData\Local\Temp\sextante\test.tif.sgrd" -FORMAT 1 -TYPE 0 -FILE "C:/test.tif" ERROR ...
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0answers
114 views
QGIS Sextante Python Error
I have some issues with Quantum Gis 1.8. When I try to use shapes to grid (sextante-saga tool) I get the following error (comes up when I try to define the new grid file name):
Fehler bei der ...
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1answer
127 views
QGIS, Euclidean distance analysis [duplicate]
i wanna generate euclodian distance map for my road data. I 'll use it for multi criteria analysis. I can get it by using Arcgis Euclodian Distance tool but i wanna generate it in QGIS environment. I ...
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1answer
32 views
GRID TO TXT in saga
i have a problem in SAGA.
I want to export several raster files to a .txt file. It means integration raster files to a .txt file. Can I do this in SAGA. Please explain?
Thanks
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2answers
257 views
how to convert grid from Saga gis to have raster in Arcgis?
i am new in Saga Gis, i created grid- LS factor (from Rusle equation for erosis) in Saga gis and now i need to "put" it to Arcgis. How can i do this? I tried a lot of possibilities and none of them ...
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1answer
136 views
How can I avoid reprojection gaps when merging DEM rasters?
I have two raster DEMs in same resolution I want to bring together. I was using the merge-function in SAGA, GRASS and QGIS but I always get the following result:
What do I need? Where could the ...
2
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1answer
298 views
Hydrologic analysis with sextante-saga in qgis
(rough translation): Hi, I want to do hydrologic analysis of a DEM with sextante-saga in qgis. I found the plugin and the needed algorithms in SAGA, enabled them in the sextante toolbox, but when I ...
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2answers
139 views
SAGA-GIS Produces different results in command line than GUI
I have been working on a lidar processing workflow using SAGA-GIS. I determined my workflow on a single tile in the SAGA GUI and now I need to batch the operations on 100 more tiles. I wrote a batch ...
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0answers
91 views
Getting SAGA-GIS Python Bindings without compiling from source
I am very new to SAGA-GIS, but I recently developed a workflow using SAGA for processing LiDAR data. Now I need to batch the process using Python. I installed SAGA from the Windows installer and I ...
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1answer
201 views
Generalize large polygon-file
I have a large polygone file with landuse information (6 classes). Its vectorised from a raster classification so the polygons are all angular. Any of my tries to generalize with v.generalize (sneaks, ...
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1answer
162 views
gdal doesn´t support my *xyz file
I have just exported a tif DEM to XYZ format with SAGA GIS. When I check this with gdalinfo it states that the format is unsupported?
Seeing as I converted this with saga gis which used gdal I find ...
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2answers
93 views
Is it possible to import SAGA colour styles in QGIS?
iam still using QGIS and SAGA independently in my productive use (despite the excellent SEXTANTE toolbox, which is sometimes a little buggy).
SAGA has some very nice default styles and i am wondering ...
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1answer
1k views
Calculate Topographic wetness index in SAGA
i am currently working on a project which involves the quantification of the wetness in certain areas. However it produces quite different results from what i expected. I'll describe the steps i have ...
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1answer
99 views
Convex Hull in SAGA Gis
How does one go about creating a convex hull from a set of points in SAGA GIS? I read that this is possible in QGIS, but I prefer SAGA and would like to see if it is possible.
Furthermore, if it is ...
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2answers
470 views
How to implement viewshed calculation?
I'm looking for a way to implement visibility (aka viewshed). I found a previous GIS SE question that suggested a few GIS applications (not what I need - I'm trying to embed the calculations), and ...
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2answers
510 views
How to compare two DEMs and show their difference?
I want to compare my DEMs (ASTER GDEM2 and SRTM4.1). I know, that the GDEM has some extreme "holes" with totaly wrong elevations (I found 3 of them in my working area). Now I need to know, if there ...
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1answer
1k views
How to configure QGIS Sextante to use SAGA?
I have been trying to set up SAGA to work using Sextante in QGIS. I have followed the instructions to configure SAGA in Sextante, with the following input in the path for the SAGA folder C:\Program ...
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2answers
677 views
How to smooth large vector polygons from Raster
I have a landuse classification raster file (6 classes) of a large area. But I need it in vector polygons so I vectorised it. No problem so far, but the result is - of course - that every pixel is ...
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4answers
451 views
How to generalize and vectorize a LandUseClassification raster file?
I want to vectorize that rasterfile with its 6 landuse classes. The classification is very noisy and have to be generalized before.
The result should be a polygone vector file.
I use SAGA, (GRASS) ...
4
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1answer
164 views
Stripes in Landsat-image after topographic correction (SAGA)
I got stripes in my topographic corrected Landsat images (see second image below).
I used SAGA GIS 2.0.8 at xubuntu 12.04
Image and DEM are in the same projection, tried it with EPSG:32636 and ...
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3answers
406 views
Generate raster from isolines
I have a vector dataset of mean annual precipitation polylines, and I would like to generate a raster from them. I'm not sure the best way to go about it. ArcGIS has the Polyline to Raster tool but ...
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3answers
219 views
Topographic correction (for land use classification) with SAGA or GRASS
Is there a module in GRASS or SAGA (or a alternative open program) to do a topographic correction of a landsat image to enhance the land use classification?
Thanks!
Martin
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1answer
766 views
How to perform Ordinary Kriging in SAGA via QGIS SEXTANTE Plug-in?
I'm trying to learn how to apply the kriging analysis in QGIS using the SEXTANTE plug-in and SAGA tools. It appears that I have my SEXTANTE and SAGA folders configured properly according to the user ...
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2answers
468 views
Is it possible to manually correct a 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 ...
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2answers
397 views
Convert classified raster map back into vector classes
I have this map (have whole country, this is just a sample, original map also contains color symbology for the value classes) and need to attach the values from it to points. I have no problem to ...
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2answers
451 views
Interpolation of contours (from one “main-contour-shapefile”)
I calculated, that the best and smalest possible äquidistance (equidistant) for my map is 30m. After I generlized my DHM, I extracted contours of a intervall of 30m and smoothed them. Now I have my ...
3
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1answer
149 views
SAGA-GIS:Viewshed creation from SHP instead of interactively?
I am using Saga-GIS to calculate a viewshed from a single point. I can do this with the interactive module, (terrain analysis > Lighting > visibility (single point) interactive) but how do I do it ...
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2answers
489 views
SAGA GIS: How to load an .hgt file?
I want to display and work with the data from http://dds.cr.usgs.gov/srtm/version1/Eurasia/
in SAGA-GIS but am having difficulties knowing which module I should use to load the data.
As far as I know ...
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4answers
475 views
How to automatically plot intermediate contours with QGIS, GRASS GIS or SAGA GIS?
I'm mapping a steep mountain range. My main contour interval is 50 m and my intermediate contour interval is 10 m. In steep areas, the interval of 10 m is too small, so I need to leave ...
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4answers
1k views
How to split a vector in equal smaller parts in QGIS or similar?
i want to divide a shapefile with many tiles into a lot of smaller tiles.
I am searching for a smart solution, because manual edits are out of questions
Anyone can help or know a nice function?
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3answers
2k views
How to calculate raster statistics for polygons?
how can I calculate sums, averages etc of raster-points (multi-band) per polygon of a vector-layer. I was told that this is called "zonal statistics". I tried that with QGIS first.
There is a way to ...
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0answers
241 views
How to create a profile with profile points at discrete altitude intervalls, e.g. each 10 m
In both SAGA and QGIS theres a profile-from-line-function that does a nice job of creating profiles. But there's no way to control the altitude spacing.
Any ideas for workflows that would allow me ...
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2answers
963 views
Efficiency of python script using SAGA and arcpy
=== SUMMARY ===
I have created a process to import a LAS point cloud, clip it, select the ground points and save the output as an XYZ.txt for clients to use. This uses a python based script (will ...
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1answer
294 views
Comparing GIS libraries
I am new to GIS. As a part of my research, I want to figure out among OSSIM, Saga API, Terralib and MApnik which one will best satisfy the following functionalities and why ( all for desktop GIS ...
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0answers
368 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 ...
4
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2answers
474 views
Altitude Above channel in GRASS 6.4
i'm fairly new to the GIS world and GRASS (come from econometric background), i would like to do some species distribution modeling using R and GRASS.
So i started to read the book of Tomislav Hengl ...
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1answer
2k views
Convert a shapefile with northing/easting to ASCII raster with latitude/longitude
Linked below is a polygon shapefile whose projection is NAD83 and whose values are LU/LC codes. Coordinates are meters of northing and easting. I would like to convert it to an ASCII raster with ...
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6answers
774 views
How to integrate SAGA Python Modules into ArcGIS Desktop?
I have been having a look at SAGA (http://www.saga-gis.org/en/index.html) and it seems to have some nice tools for geoprocessing. I was wondering if anyone out there has had any luck bringing SAGA ...
