QGIS is a cross-platform GIS application licensed under the GNU General Public License.

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Problem with QgsMapCanvas().zoomToSelection() when running from function

I have the following function which, when typed in to the python console line for line works fine, but when I use the function it gets as far as highlighting/selecting the accident (feature) but the ...
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1answer
62 views

Keep up to date a cpp-plugin(windows) for QGIS with less effort

We have two c++-plugins for QGIS and thought with the LTR release we are bit saver against the fast version-changes. Today I updated my QGis from 2.14.0 to 2.14.4 and had to recognise, that the ...
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1answer
76 views

Extract height values from vector to CSV

I have generated a CSV file (using the MMQGIS plugin) expecting to obtain all the coordinates of a vector layer that I have created. But the output file only contains the latitude and longitude ...
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20 views

Add r.null functionality to GRASS toolbox algorithms in QGIS

I'd like to be able to use GRASS's r.null operation in the QGIS processing toolbox (not via the GRASS plugin). However, it doesn't seem to be available. How would I go about adding code to allow for ...
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2answers
42 views

Create 1km Grid in QGIS from Canada Topo Data

I've been struggling with this all day and can't seem to get anywhere, even with the help of other forum posts. I'm pulling vector data from the canadian gis system, and loading it into QGIS. That ...
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19 views

install QGIS 2.14.3 on Mac OS 10.11.4: How do I get past the “Verifying 'GDAL Complete.pkg'…” message?

Trying to install QGIS 2.14.3 on Mac OS 10.11.4 I am following the helpful guide here: http://drjill.net/10-step-guide-to-install-qgis-on-a-mac/ - Security set to install downloads from Anywhere. At ...
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1answer
33 views

Loading WKT polygons into QGIS

I have downloaded a file showing the status of the National Broadband Network. The CSV file contains a field "Development Shape", which contains "POLYGON ((153.101112401 -27.797998206, 153.097860177 ...
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1answer
32 views

Grass GIS messed up projection

I needed to load a shape in GRASS GIS to use the v.clean.snap function. The .shp was first viewed in QGIS, projected in 3857 or 4326, I don't remeber. After the adjustments in GRASS GIS I exported to ...
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1answer
28 views

Can't choose interpolation attributes of my shapefile

I am attempting to interpolate data of a point shapefile. In the attribute table all attributes are shown correctly. When I am trying to interpolate them with Raster >> Interpolation no attributes to ...
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1answer
48 views

QGIS Calculate Field with Function Editor invalid expression

I have some data which is built like this: a,bbb,ccc where bbb and ccc vary in length. I want to extract the last segment of the string, after the second ",". Using the Function Editor: from qgis....
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23 views

QGIS: SVG fill patterns not displaying

I have created several custom SVG symbols in Inkscape to use in QGIS. I have several that have fill patterns, but these patterns are not displaying in QGIS. I also am having this problem with symbols ...
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72 views

How to create a semi-transparent map collar in QGIS composer?

In QGIS 2.14, how can I create a semi-transparent "map collar" (white space around the outside of the page) in Composer? I imagine the map collar would be some sort of graphic shape (not a feature) ...
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1answer
30 views

QGIS select points within certain radius

I've seen other threads ask very similar questions, but I haven't seen one that answers this specifically: So, I have 4 Total sets of points. 1 set is a set of addresses in Arkansas, the other 3 are ...
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1answer
124 views

QGIS 2.16 Nødebo installation package for OSX

Im using qgis on my mac, few days ago the notification of the new available 2.16 version appeared in user interface. I went to the official webpage of the qgis but did not succeed. qgis.org is ...
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16 views

Show labels in QGIS for GeoPackage

Ok, I must be missing something obvious. I've tried to followed several steps to show labels of point features of a GeoPackage file. But I always have a blank Labels view. I just can't change anything ...
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0answers
31 views

Reproject coordinates in order to correct them in QGIS

I got two type of coordinates(correct values and incorrects(15m error)), and i want to specify transformation parameters between them in QGIS. I thought that finding Helmert transformation parameter ...
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6 views

Filling SRTM DEM 1 arcsec with 3 arcsec DEM in QGIS

I have a 1 arcsec (30 m) SRTM dem with some missing data. I want to fill the missing data with the values of the 3 arcsec SRTM dem (90 m), which is complete. How can I do this? Is that a good ...
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2answers
33 views

I want import a *.svg file in qgis

I installed the new version of QGIS 2.16 and I want import an image (SVG file) as symbol for my point, but the Setting style supports only xml format in import. Before, with an older version of QGIS, ...
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2answers
52 views

Find line segment that is not between other lines with QGIS

As shown in below image, I have a project with rivers(blue) which are bordered by fences(green). I have to identify the places that are not guarded by fences. The fences can be further away from the ...
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0answers
27 views

QGIS - Get unique values over multiple fields

For creating a legend of a map, I need to get a list of unique values over multiple attribute columns of a layer. I know how to get a list of unique values within one column - is it possible to get a ...
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2answers
110 views

QGIS 2.16 installed together with QGIS 2.14 standalone?

I have just downloaded and installed QGIS Standalone Installer Version 2.14 (64 bit)from this site for a Windows 7 OS. It seems that version 2.16 has been installed too! When I launch a QGIS project, ...
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12 views

Problem with dicttoxml module import

I have python 2.7 and I have just installed (via pip) a module named 'dicttoxml'. This module should work with 2.6+ python version. I am importing it to my *.py file and using it in my plugin code. ...
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1answer
81 views

QGIS update failed

Until yesterday my whole qgis and python-qgis worked fine with version 2.14 under Ubuntu 14.04. After a simple sudo apt-get update and sudo apt-get upgrade qgis failed to update... Several attempts to ...
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1answer
16 views

QgsVectorFileWriter returns false output

I am trying to make a script that reads the content of a .dbf-file and exports it as a shapefile. Equal to the manual pattern "Save as.." when rightclicking the imported layer in the Qgis Desktop. I'...
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17 views

QGIS python pyd extension and execute python command from pyd

I create python extension as pyd in visual studio. This test made in Delphi. Extension run python command use PyRun_SimpleString or any RUN function. If this extesion import from python console ...
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28 views

How to save a georeferenced image in jpeg2000 in qgis?

I'm georeferencing an jpeg2000 image in qgis, but qgis is only capable to save it in geotif, but gdal would be able to save it in jpeg2000. How should i modify this script: "gdal_translate -of GTiff -...
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1answer
45 views

Counting attributes from line intersections with polygons on QGIS?

I have a line layer with 1300 features and a polygon layer with 19,000 features that represents buffers of points. I need to determine how many polygons does each individual line intersect. And have ...
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17 views

Can I ignore this error when registering a Geopackage file in QGIS DB Manager?

Although Geopackage and SpatiaLite are both built on SQLite, QGIS does not treat them the same. For one, while SpatiaLite has its own "Add SpatiaLite Layer" dialog, which also allows you to register a ...
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2answers
47 views

Comparing layers in QGIS and finding overlay?s

I'm a newbie to QGIS. I have run into a thing I can not solve despite trying to search for a solution and working through the functions in the tool. I have two layers I want to compare. One is filled ...
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22 views

Creating 3D Geo-Database System with QGIS

Currently I am working on a project to create a Virtual 3D City Model. I have Digital Aerial Photos, Digital Terrain Models, Geo-referenced Thematic Data, 3D Geodata, Digital Architecture Models, and ...
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13 views

QGIS Plugin -> QgsVertexMarker points missing: Anyway to find out which points are not visible?

I am trying to plot live feed of three GPSs running at 10 hz using my own QGIS plugin. I was using QgsRubberband initially which worked fine. I recently added QgsVertexMarker to plot every data points ...
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1answer
63 views

Drawing concentric circles that correspond to free space loss formula?

I want to be able to draw a circle with 50km radius and then fill the circle with values corresponding to the free space loss formula below: FSPL(db)=20 log10(d)+20log10(f)+32.44 for example: a ...
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1answer
49 views

Adding ArcGIS Online Services to QGIS

Looking for info on how to add web mapping services from the Ohio Department of Natural Resources website to QGIS. I've tried nearly a dozen different things online and still can't get results. Don'...
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0answers
20 views

How can I reorder the panel tabs in QGIS

I know I can rearrange the panel tabs by undocking a panel and on redocking it becomes the leftmost tab, but is there a more direct way to re-order the tabs? QGIS 2.12 Lyon Windows 7 64 bit
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2answers
72 views

Drone aerial imagery to QGIS

I used Phantom DJI Standard 3 drone for some aerial photos of an archaeological site. When I view the properties of the jpeg file, it contains Longitude (like this: 22; 14; 37.701258239) and Latitude (...
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1answer
28 views

How to resize a raster SUMMING the values of pixels in QGIS?

I would like to be able to resize a raster such that the values of the resized pixels are based on the SUMS of the original raster pixels, rather than the averages. The output should be generated thus:...
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13 views

OpenLayers will not show PostGIS layer hosted on Geoserver [duplicate]

I'm new to this. When I try to create an Openlayers map using the Web App Builder in QGIS of a PostGIS layer hosted on Geoserver I get the following error: Server for layer does not support JSONP. ...
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2answers
46 views

Is it possible to arrange multiple attribute tables in tabs in QGIS?

Is it possible to arrange multiple attribute tables in tabs in QGIS? It annoys me that when opening a new attribute table it appears beside the old ones and even shifts other parts of the GUI around ...
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1answer
22 views

how to have french menu/bar in qgis with arabic windows

I have windows 7 in arabic. now I dowload qgis 2.14.3-2 in french. But when I intalled it, it come with arabic menu/tools ... Please how I can have a french menu.
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1answer
31 views

Process MODIS bands on QGIS

I would precess MODIS images on QGIS (in particular swath images MOD09A1). I use MODIS Reprojected Tool Swath to trasform .hdf file in GEOtiff but there are different avaible bands (16) and i don't ...
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14 views

Rescale raster files in QGIS

I want to construct a surface of predictions in QGIS, using several probabilities I otained previously in R, by constructing GLMM. But I rescaled my variables before constructing GLMM, so I also need ...
2
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1answer
54 views

How to use the QGIS GDAL Toolbox Offset lines?

I try to create a single sided Offset line for a line. I used the GDAL-Tool "Single sided buffer and offset lines for lines" but I fail. The error message says "wrong number of arguments to function ...
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2answers
62 views

How do I convert XYZ coordinates to another projection system

I am trying to convert between coordinate systems in QGIS. I have a point file in NZGD49 coordinates (EPSG:27200) (referenced to the geoid) which I am trying to convert to NZGD2000 coordinates (EPSG:...
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1answer
46 views

Why is QGIS project in recent projects greyed out?

When I open QGIS, there are projects which cannot be chosen. They work when I start browser of files and click in directory where the projects are. Are there options to change it?
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1answer
51 views

Reset Python libraries modified by QGIS on Mac OS X to original versions

I am facing problems in python after installing QGIS. While installing QGIS, it mentioned that it would override my matplotlib and numpy python libraries. I am facing trouble with executing python ...
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1answer
28 views

Attribute Table [closed]

I have geological data in shape-file, I do not know which data to open and how from attribute table in QGIS. I need just a map but I do not have an experiences with GIS.
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1answer
42 views

Showing years 1995-2000 in “Select features using expression” in QGIS

I have an attribute table that shows states, years, and other specific things of that state in that year. How do I create an expression (so I can export a shapefile with these selected features) that:...
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1answer
99 views

QGIS 2.16 GRASS geoalgorithms don't work?

I have problem again almost like version QGIS 2.14. I did not solve the problem. QGIS 2.14 GRASS geoalgorithms don't work? I install C:\MinGW and now QGIS grass geoalgorithms don't work? There is ...
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23 views

Land cover generation

I am working on a river watershed on QGIS and I need a land cover map. I have a good raster of land use data with 15 m resolution for year 2015, but it covers around the 90 % of the basin. I have ...
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1answer
60 views

How to build Final Web App from QGIS Web App Builder

I have used Web App Builder plugin from Boundless to build web app,but the app only shows in browser when i Click |Preview|. App created using |Create App| does not open up in browser. It says |Build ...