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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4
votes
0answers
776 views

Problem loading output layer QGIS

Every time I run operations with temporary file output from the graphical modeler, I get the following error message: Oooops! The following output layers could not be open CLIP: C:\Users\Amine\...
4
votes
1answer
6k 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 ...
3
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2answers
953 views

QGIS: Saga Channel network: how to prepare SRTM data

I am trying to use the Saga toolbox (2.2.3) in QGIS (2.18) to create a channel network from SRTM data using this tutorial 1. It works, but the result I get when using the DEM that comes with the ...
2
votes
2answers
2k views

Interpolation of contours (from one “main-contour-shapefile”)

I calculated, that the best and smallest possible äquidistance (equidistant) for my map is 30m. After I generalized my DHM, I extracted contours of a interval of 30m and smoothed them. Now I have my "...
9
votes
1answer
611 views

Which SAGA versions does QGIS 2.18.10 support?

Beginning with QGIS 2.18.10 the SagaAlgorithmProvider do not longer have a dictionary called supportedVersions. Previously, it looked like this: supportedVersions = {"2.1.2": ("2.1.2", ...
8
votes
4answers
3k views

How to change SAGA path in QGIS 2.18 Standalone

I have installed QGIS 2.18 Standalone (64 Bit) with SAGA GIS (2.1.2) and GRASS GIS 7. Afterwards I have installed the newest SAGA GIS 3.0.0. I want to change the SAGA folder in the processing options,...
6
votes
1answer
699 views

Delineating coastal subbasins using SAGA GIS or GRASS in QGIS?

I'm having some problems trying to delineate watersheds using the SAGA watershed delineation tools in QGIS. I have a SRTM DEM (cell size 30 m) which I set the water cells to NULL values, following ...
5
votes
2answers
715 views

Add Polygon Attributes to Points error QGIS

I am trying to run the Add Polygon Attributes to Points algorithm from the Processing Toolbox in QGIS but I run into an error. All my points are either inside the polygon or exactly on the border. I ...
4
votes
1answer
1k views

SAGA grid tools missing in QGIS

Grid options are missing in SAGA toolbox. If I go to options in processing the following message is being displayed. How should I change the path?
4
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1answer
1k views

Which interpolation method is used in the close gaps module of Saga GIS?

I like to close gaps in a raster layer using the Module Close Gaps of Saga. I can not find which interpolation method is used by the module. Which method is used by the module and/or where can I find ...
4
votes
2answers
3k views

SAGA raster calculator, ifelse command syntax problem?

I am trying to get the saga raster calculator in QGIS to spit out all values of a raster that are inferior to 10, and make all other values zero. I think the syntax is correct but I keep getting the ...
3
votes
1answer
635 views

Set path to SAGA from QGIS on OSX

After a crash and subsequent reinstall I cannot access SAGA GIS in the processing toolbox, and it appears that QGIS can't find it as there is no setting for the path. How can I set the path from ...
3
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0answers
166 views

Raster calculators in SAGA return incorrect results

Here's a sample of my dataset (one cell) with 28 different raster values, representing 28 individual Float32 rasters with identical parameters. 0.0000264434, 0.0049953502, 0.0007529828, 0....
3
votes
1answer
729 views

No Saga in QGIS 2.12

After installed QGIS 2.12 I don't have SAGA in Processing Toolbox anymore and I need it bad. Am I blind, can't find it or something went wrong? Any suggestions please? My OS is Win 7 64 bit.
3
votes
0answers
1k views

how to orthogonalize building outlines

I'm looking for a way to orthogonalize building outlines which I've extracted from a high-res DEM. I'm using the FOSS GIS stack (QGIS, GRASS, SAGA, PostgrSQL, PostGIS) and can code in Python (or Java)....
3
votes
1answer
438 views

Sextante in Qgis 1.9 alpha on Ubuntu can't find saga gis 2.1

I am using Qgis 1.9 on Ubuntu 13.04, Sextante is a core part of qgis now. I am trying to access the SAGA 2.1 libraries through qgis and I keep getting a popup window that says SAGA is not installed. I ...
3
votes
1answer
1k views

SAGA algorithms don't work in QGIS 2.8

when I have installed recently QGIS 2.8 and, since then, SAGA algorithms don't work. Apparently, the algorithm runs well (any error is showed while it is executing the algorithm), however, there is ...
3
votes
1answer
798 views

Failed DEM via Natural Neighbor in QGIS 2.14.2-Essen

Following the indications of Monde Geospatial (https://www.youtube.com/watch?v=bLbY3iMBW-A) I created a CSV file with the altitudinal data (Google Earth) for 2182 total points and imported it into ...
3
votes
3answers
430 views

QGIS cluster gdal Unknown option 'INTERPOL'

I am running cluster analysis from image analysis menu of saga provider in QGIS. I use the qgis GUI from processing tool box, I call saga modules. I got same error in many other algorithms. I can ...
2
votes
1answer
269 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 ...
2
votes
1answer
2k views

Where does the output of a grid volume run in the Saga tool/ Qgis end up?

I have tried to do a grid volume run with the Saga grid calculus - grid volume function. After the run the window closes and nothing seems to happen, no message, no new layer or information appear. I ...
2
votes
0answers
785 views

Why does the “local maxima” module in SAGA GIS put so many “maxima” points on lakes and plains?

SAGA GIS puts too many maxima points on plains and lakes. Why does it happen? Is there a way to avoid this? It's not really a big problem (the value is correct) except for the size of the SHP files in ...
2
votes
1answer
351 views

Why does SAGA raster calculator interpolate between cell values?

I have a raster layer with a series of integer values (classes) for each cell. I am trying to use the SAGA Raster Calculator module (called through QGIS) with conditional statements to reclassify each ...
2
votes
1answer
680 views

Error in catchment area calculation

I downloaded a DEM based on the ASTER Global Digital Elevation Model (resolution 30 m; ASTGTM2_N42W009_dem.tif) from the Earth Explorer website (https://earthexplorer.usgs.gov/). I am trying to ...
2
votes
1answer
2k views

QGIS 2.12 & Ubuntu 14.04 SAGA installation not found

Installing QGIS 2.12 on Ubuntu 14.04 from the debian trusty ppa. Upon opening QGIS I notice the following error under the Processing tab: Problem with SAGA installation: SAGA was not found or is not ...
2
votes
2answers
942 views

Setting SAGA folder for QGIS with OS X for macports install?

I am trying to get the toolbox to work in QGIS 2.6, but I keep getting an error message that SAGA is not properly configured. After much digging, I finally found I can set the SAGA folder in ...
1
vote
0answers
490 views

How to show and access SAGA not shown in Processing Panel in QGIS 2.18.4? [closed]

How to get SAGA modules to show and be usable within QGIS, i.e. from within the Processing Panel? I have tried reinstalling SAGA (now = Version: 2.1.2 64 bit) through the OSGEO4w installer and tried ...
1
vote
1answer
81 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 ...
1
vote
1answer
1k views

Add raster value to features AttributeError: 'module' object has no attribute 'TYPE_RASTER'?

When I try to run the "add raster value to features" (available into SAGA Tools), I get this error: Traceback (most recent call last): File "/usr/share/qgis/python/plugins/processing/gui/...
1
vote
3answers
231 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 ...
0
votes
0answers
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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