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

learn more… | top users | synonyms

0
votes
1answer
11 views

Download data from webmap made with leaflet

Can I download the data from a webmap made available from leaflet? I am referring to these dataset (https://www.vectorbase.org/popbio/map/), for which I wish to download the data for Europe? Is there ...
4
votes
1answer
92 views

Programmatically finding polygons which are >90% overlapped by another vector polygon layer using QGIS?

I'm trying to figure out how to use python to extract the polygons in one vector that are overlapped by >90% by another vector. I would then like to have a vector/map that will only show those ...
0
votes
0answers
17 views

How to set “draw line inside polygon” using Python?

In the QGIS properties of a layer I want to activate "draw line only inside polygon" for a specific layer, but using Python. I don't want to use the GUI for it. Can this be done? I set the line ...
0
votes
1answer
27 views

Can't render my own map canvas

My goal is to make a standalone application using the QGIS library, but for now I'm trying to make everything work in a Qgis plugin. I need to create a map canvas inside my plugin window. There is ...
0
votes
0answers
14 views

PYQGIS Layer to KML?

I am aware that it is possible, in QGIS, to save your Vector Layer as a KML file manually, however, I want to know if there is anyway I can do this programmatically from an external Python Script that ...
0
votes
0answers
16 views

Unable to export in any format with Print Composer (QGIS) [duplicate]

Well, as title states, I'm not being able to export in any format (nor image nor PDF). Just to try this function I added a map (with OpenLayer Plug in as background which loaded just fine in the Print ...
0
votes
1answer
13 views

QGIS On the fly reprojection issue

i'm having an issue with QGIS 2.14.3 (Windows 10). I've two layers: PostGIS table (EPSG:23030) Shapefile (EPSG:25830) I setup on the fly transformation (23030) in QGIS, just for check, but both ...
13
votes
6answers
12k views

Why do OpenLayers layers appear shifted in map composer?

I'm having trouble with the OpenLayers Plugin of Qgis and the map composer: If I create an OSM-background layer and if I want to export this, the OSM-Layer looks perfectly all right in the normal ...
2
votes
1answer
73 views

Customising QGIS Map Composer default output directory and file name suffix?

I am using QGIS for map making , I am adding multiple vector and raster layers and then finally for map making I am moving to the map composer. When I am exporting the map from Map composer , I want ...
2
votes
2answers
555 views

Chinese characters appear in attribute table

I am running QGIS 2.4 on a mac, and all of the text in my attribute tables appears in Chinese. I've tried uninstalling and re-installing, changing the locale to U.S. English, and nothing helps. I've ...
1
vote
1answer
20 views

How to optimize QgsFeatureRequest with filter expression

I have a point PostGIS layer (my_layer) which has more than 66000 features. I am getting the features I want but it takes too long. My code is: resultList = [] req = ...
0
votes
1answer
19 views

QGIS 2.14.3 export PostGIS layer to dxf issue

I am trying to export a PostGIS layer to dxf in QGIS (2.14.3) via Project>DXF-Export using the following settings (German GUI): When I open the resulting dxf in DWG TrueView 2016 I see nothing, but ...
0
votes
1answer
39 views

Attaching toolbar in QGIS?

I have a similar problem to Getting back to side bar after detaching layer panel?, but with toolbars. So I accidentally detached digitizing toolbar (and other toolbar as well), and cannot put it ...
3
votes
1answer
558 views

Getting back to side bar after detaching layer panel in QGIS?

I accidentally clicked on the detach icon on the layer side panel of QGIS and now it floats and I cannot get it back to the side bar where I want it.
0
votes
0answers
27 views

How to automatically filter data from a table in the composer QGIS 2.14.2?

I have configured in the print composer 3 attribute tables with a filter to display values of a map. Currently the filter only shows the data area 27 and if I center the map to display another area ...
1
vote
0answers
818 views

qgis-bin.exe - System Error

I'm running QGIS 2.8 Wien on Windows 8.1. I got this error: The program can't start because qgis_core.dll is missing from your computer. Try reinstalling the program to fix this problem. I ...
2
votes
1answer
44 views

Merging raster files produces error in QGIS?

I'm trying to merge (Raster -> Miscellanous -> Merge) four raster files into one. Each file has same CRS and are saved as .tif files. Merge produces error: "The process crashed some time after ...
1
vote
1answer
13 views

TrainImagesClassifier (SVM) fails when executed from within QGIS modeler

I made a small model in QGIS that runs Second Order Image Statistics, the SVM Trainer, and Image Classification, all tools from the Orfeo provider. The problem is it fails everytime. When I run the ...
0
votes
0answers
15 views

QGIS Line overlap itself [on hold]

How can I tell to QGIS that if a line intersect itself in one or more points it must consider as an overlap?
1
vote
0answers
13 views

issue in DXF file

the problem of getting from DXF format, to display in QGIS correctly.we have loaded it in and fixed the rotation and TTF font mapping problems. That is all great however the objects are coming in ...
3
votes
1answer
52 views

Dynamic Linear Referencing of events in QGIS from Excel or CSV using virtual layer

I have a PostGIS table with a geometry type LINESTRING M to represent routes. Here is the table specification: CREATE TABLE routes ( fid serial PRIMARY KEY, r_name text NOT NULL, geom ...
2
votes
1answer
28 views

How to Select a Polygon beneath another Polygon in QGIS 2.14

We have a series of layers that contain polygons with additional polygons 'underneath' each polygon. How do we select the polygon beneath the existing feature without also selecting the feature ...
0
votes
1answer
25 views

Restore previous versions of Qgis file

I´m trying to recover a previous version of a Qgis file, because I started playing around with CRS, and saved the file and closed it, thinking next time it woud be easy to get everything back into ...
2
votes
3answers
8k views

Export shapefile to KML for Google Earth - using QGIS

I am a real beginner with QGIS. I have shape files of my study site. I would like to have the nice google earth background. I would like to be able to see my files in Google earth, then I can zoom ...
0
votes
0answers
18 views

QGIS error: 'NoneType' object has no attribute 'isGeosEmpty'. What's wrong with this union? [on hold]

I'm trying to union two vectors. The red + grey polygon layers shown above. When I run union I get the following error: 'NoneType' object has no attribute 'isGeosEmpty'. Any help with what may be ...
1
vote
1answer
350 views

How to set field values as labels in QGIS2 Print Composer

I am mapping the distribution of 325 bird species, displaying circles in the grid cells each species occurs in. The data contains as many duplicates of the NAME as there are cells in which it occurs. ...
0
votes
2answers
311 views

Remove sections, defined by a line or polygon, from a raster in QGIS

(QGIS 2.6.0 on Windows.) I have created a raster layer of heights using the TIN interpolate function. I also have another raster layer with more accurate information on the height of particular areas ...
1
vote
2answers
44 views

Remove small areas from SHP shapefile in Qgis? (Python R etc)

I have a very complex file showing remnant vegetation data. I wish to remove very small areas (preferably with a threshold that I can set) and generate a file that shows only larger blocks of ...
3
votes
2answers
38 views

Patchy country polygon after converting ESRI shapefile to KML

My goal is to render the country boundary of Scotland in KML format so I can use it with Google Fusion Tables. I’ve so far managed to do this but with chunks of its surrounding islands missing, so ...
2
votes
1answer
37 views

How to use the “Grid for Indexing” in the print composer QGIS 2.14.2?

I created a grid with plugin Create Grid for Indexing. Until now all fine. But how can I use the grid (Create Grid for Indexing) in the print composer? The task: I have a map and a overview. I want ...
7
votes
4answers
11k views

Viewing .las format LIDAR data in QGIS?

Is there an easy path to visualizing LIDAR data in QGIS? I have some USGS LIDAR data in .las format downloaded from http://lidar.cr.usgs.gov/. This means I have both the .las and metadata in .xml ...
4
votes
1answer
60 views

Importing LiDAR .txt in QGIS for map conversion

I have LiDAR data in .txt files (1000 to 26000 KB), where 2nd column marks x-coordinates, 3rd col y and 4th col z. 8 485000.16 6508997.48 1.84 66 Last 2 485001.27 6508998.92 1.86 82 Last 2 485001.02 ...
2
votes
1answer
43 views

Interpolation from WFS point layer

In QGIS, I added a WFS-Layer from my geoserver, containing few point data with a numeric attribute (Z-values). This works fine, and all the points display on the map. Now I just assumed, I would be ...
8
votes
2answers
2k views

How to add a toolbar via python?

Through tutorials I learned how to add a toolbutton to the plugins-toolbar via python. Now I wonder how to add a complete toolbar with toolbarbuttons via python. Can anybody give some example-code? ...
2
votes
1answer
182 views

About spatialite views and Attribute table

I try to use views with spatial column in spatialite. I can connect to spatialite database and load the layer without problems but when I try to view data in Attribute Table I can't get eny data; all ...
2
votes
2answers
52 views

How can I add a second Toolbar Button and Dialog to a QGIS plugin built with Plugin Builder?

I want to create a toolbar with 2 buttons, each button opening a different form. The steps I followed are: Created a plugin using Plugin builder Created a toolbar with 2 buttons by doing the ...
2
votes
1answer
54 views

How to create a custom coordinate grid in the QGIS 2.14.2?

I want to create a custom grid different from latitude / longitude, with letters and numbers on the axes. X = A, B, C, D, D, ... Y = 1, 2, 3, 4, 5, ... A B C D E 1 2 3 A B C D E I also ...
4
votes
3answers
131 views

Is there a way of labeling the number of points with the same coordinates?

After reading through the following question (which is kinda related but not quite what I need): How can I show points on the same coordinate as e.g. a bigger symbol in QGIS? I found out that there ...
2
votes
1answer
393 views

Unable to access R from QGIS 2.4

I have been unable to run R from within QGIS on my computer. I have R version 3.03 installed and QGIS 2.4 on Windows 7. R is located at C:\Program Files\R\R-3.0.3\bin\and this is the path e specified ...
0
votes
0answers
17 views

QGIS Qt Designer set current date and time in mask

I have created an input mask for QGIS using the Qt Designer. Everything works fine but I have a small issue with the date, the time and the date/time edit widget. Is there any way to display the ...
8
votes
1answer
536 views

Is it possible to have dynamic layer names in QGIS project?

I have a QGIS project with layers, based on PostGIS SQL queries that use current date. Since the data in the database changes, these queries return different data every new day. Is it possible to ...
1
vote
2answers
23 views

QGIS 2.12/14 Add GPS Point missing geography

I am trying to use the integrated GPS module from QGIS to add data points to a shapefile while in the field. I managed to get the connection between qgis and the gps working and my location is shown ...
0
votes
0answers
26 views

QGIS Mean coordinates, very slow?

I use Mean coordinates tool for a layer where the UID is a string and weights are real numbers. I find it very slow (literally hanging QGIS for few minutes) when processing datasets of more than few ...
0
votes
0answers
27 views

Qgis map is disfunctional

Of recent I have this problem with Qgis 2.14 that my map composer won't produce a map of my project but instead it goes all blank. I even used 2.12 and even after uninstall/install the problem still ...
2
votes
1answer
638 views

Visualizing a LiDAR point cloud in 3D with GRASS?

I'm new with QGIS and GRASS so I'm sorry if there is a straightforward answer for this question but I can't seem to get it done. I've imported a point cloud into QGIS from a datafile. Now I'd like to ...
1
vote
1answer
54 views

Importing Data with CSV

I am wondering what I would need to do in order to import a CSV file and then combined that with an existing layer. I would like to know which boxes I need to check in order to make this combine with ...
1
vote
1answer
31 views

Digitizing jpeg image or georeferencing it first?

I'm a new learner when it comes to QGIS. I have a jpeg image and I want to convert it into a shapefile. The problem is when I polygnized it, the resulting image is inverted. So i decided to just ...
3
votes
0answers
39 views

QGIS canvas refresh & rendering control from plugin?

Plugin Description I have been working on a plugin which essentially doing the same as "GPS information" live tracking but with capability of displaying two GPS streams. I am comparing streams and ...
0
votes
1answer
41 views

QGIS Processing Toolbox not valid

I have a 64 bit windows 10 computer with ArcGis 10.2.2 Installed. I just downloaded QGIS the newest version 2.14 64 bit. it downloads but the processing toolbox throws this error Couldn't load ...
3
votes
2answers
55 views

Semi, third, quarter circle and other compound style symbols in QGIS?

I think I used quarter (and other) circles in QGIS in the past. But it might be as well that it was only in different software. Anyway now I am not able to find in symbols any option for compound ...