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

learn more… | top users | synonyms

1
vote
1answer
67 views

Importing XML data into QGIS

I've got a problem importing XML data in QGIS Wein. I've exported the XML data from an interactive PDF map viewed in Adobe Acrobat Pro DC. When I try to import the XML file into QGIS using the ...
1
vote
1answer
45 views

Raster calculator fails with large raster in QGIS

I'm working in QGIS 2.14.1 with a DEM ranging from 200 feet to 1600 feet elevation called "dem_3m_Zft1b" (geotiff, 16822 X 33349 cells, No-data =-9999) If I enter "dem_3m_Zft1b" > 0 in the ...
2
votes
1answer
29 views

using PyQGIS to subsample a region of a raster layer's pixel data

I am having trouble sampling multiple pixels from a raster layer at oe time. If I want to sample pixel data from a layer at a particular coordinate I can write. ident = ...
4
votes
1answer
35 views

PyQGIS toggle group visibility (and recursively subsub…group visibility)

I would like to set visibility of a layer group and all of its children (and grand-children and so on...) using PyQGIS (QGIS 2.14.1). Assume the groups name is g0 with subgroups g0[1...n] and ...
0
votes
1answer
70 views

Save raster layers in a python script

Is there a way to loop through every selected layer in qgis and save it as a .tif file with the same layer name using a python script? This is the code I am using, but it does nothing at all. It runs ...
1
vote
0answers
57 views

QGIS on Samsung GT-N5110 - invalid Qt version

I want to install QGIS Experimental on my Samsung GT-N5110 tablet. When opening QGIS cannot open additional libraries and there is an error message: "Invalid Qt version" and QGIS crashes. I use ...
2
votes
1answer
40 views

Retreive pixel value from raster layer in pyQGIS

I am trying to access the pixel data in all bands from a raster layer in QGis from the Python Console. I have looked at several online resources including ...
3
votes
1answer
43 views

Scripts to automate conversion from DEM to contour shape files

I am using the DEM files in the Cornell CUGIR repository to build contour layers in QGIS. The problem I have is that while it is easy to do, it requires many manual steps in QGIS that are both ...
1
vote
0answers
21 views

Publishing in QGIS Server (WMS, WFS-T) only certain map extent

I am trying to publish a layer in WFS-T but I only want to publish a certain zone ( 10% of the whole layer ). So I choose my extent in QGIS canvas and I go to Poryect Properties / OWS Server and I ...
3
votes
1answer
31 views

How can I aggregate coordinate points attributes from multiple similar layers into one layer following a specific route in QGIS

I'm new in QGIS (and GIS in general). I posted a screenshot to help you understand my question. I have data from 3 different runs measuring air quality in the streets shown in the screenshot. As you ...
0
votes
0answers
37 views

How to open ArcGIS personal geodatabase (*.mdb) in QGIS installed under Ubuntu

I did open easily ArcGIS personal geodatabases (mdb files) under my previous Windows version of QGIS by using "Add Vector Layer" > (Source type) File, but I cannot use the same method under Ubuntu ...
1
vote
0answers
40 views

How to find a layer by name in the QGIS layer panel?

I have a large QGIS project organized with several groups in the QGIS layer panel. It happend to me a couple of times that, when the computer is operating with low resources (low free memory-high CPU ...
3
votes
2answers
114 views

Changing polygon boundary thickness/color

How can I make the polygon boundaries of admin 1 thicker than thous admin 2? I. e. I want to make the province boundaries thicker than its district boundaries.
3
votes
1answer
44 views

Qgis2threejs installation problem

I have just downloaded Qgis2threejs plugin from: Plugins/Manage and install plugins but the tool doesn't appear in the toolbar. Does anyone know what is wrong? I'm using QGIS 2.14.1 Essen.
0
votes
0answers
11 views

QGIS's Print Composer forces PDF export in raster format only when Grid is added/activated

It happens from QGIS 2.6 up to most recent 2.14 that Print Composer forces PDF export to be fully raster image instead of exporting raster layers as raster and vector layers as vector. It is not ...
0
votes
1answer
34 views

Convert this CSV to a qgis usable format

I have been given a CSV (which has been converted from a RDF). I want to convert the CSV file to a usable format so that I can display these polygons in QGIS. The original file and some other ...
1
vote
1answer
47 views

Qgis 2.14 & spatiaLite : MakeLine and aggregate function

I want to create a line between points 104 and 74. This works : select 1 as axe, make_line(p1.geometry, p2.geometry) as geometry from MR200_amers_plan p1, MR200_amers_plan p2 where p1.matricule = ...
3
votes
1answer
71 views

How to add OpenSeaMap to QGIS QuickMapServices?

I'd like to add OpenSeaMap to QuickMapServices. Their wiki http://wiki.openseamap.org/index.php?title=De:OpenSeaMap_in_Website has some usage examples and lists the following tile servers: ...
2
votes
0answers
41 views

Converting from unknown coordinate system into common one using fiducial points?

I have a thousand of points that I want to project in a different coordinate system. These points were generated using an old and odd coordinate system (let's call it CS) so it's not possible to use ...
2
votes
1answer
46 views

Update column/Join in QGIS similar Mapinfo

Looking somewhat similar to UPDATE COLUM option ( for join) MapInfo in QGIS. This exists ?
2
votes
2answers
37 views

QGIS - How to determine the length of a KML line tracing

I have a KML file which contains a line feature representing the passage of an Optical Fiber connecting two cities. I can trace them nicely in QGIS and OpenStreetMap. I would just like to know how ...
1
vote
1answer
59 views

QGIS 2.14.1 Open Layers plug in Missing

I have installed QGIS 2.14.1, I am looking for Open Layers Plug In which I could not find under Install Plug ins as well as Web menu.
2
votes
1answer
41 views

Using Shortcut for QGIS Processing Script

I grabbed code from here to assign shortcuts for quickly changing to preset scales. When I did it for one shortcut, it was working - but then, when applying several ones it didn't anymore - though ...
2
votes
1answer
33 views

Does QGIS offer the possibility to identify overlapping features in a single WMS layer?

I work in QGIS 2.10.1-Pisa and use the 'Identify feature' tool to get the feature info of building polygons found in a single layer of a WMS. Some of these building polygons overlap. When I select ...
1
vote
0answers
30 views

Forcing polyline to offset from polygon border

I am currently working on a site with polygons and polylines and am looking for a way to ensure that the polyline does not overlay the site boundary. I am creating a habitat map and do not want the ...
0
votes
1answer
45 views

How to export a 3D map into a image file?

With qgis, it seems to be possible to visualize 3D with two tools : nviz and Qgis2threejs. But i would like export the result into an image file. Is it possible to do that with qgis?
3
votes
1answer
132 views

How to change a project variable using Python?

I'd like to change the value of a user-defined project variable (can be manually edited in Project Settings | Variables) using the Python console. I tracked down the setVariable() function in the ...
1
vote
1answer
71 views

How to cleanly upgrade QGIS on Windows?

I'd like to upgrade QGIS from 2.8.1 to the lastest LTR version. I'm looking for a clear explanation on how to achieve that on Windows (I'm on Windows 7). Such information is not easy to find, ...
1
vote
1answer
20 views

Export data from “Identify Results” table to Attribute Table

I am working on a street network in QGIS. I needed to increase the resolution of the street segmentation in an area of my network, so I copied and paste this area from another layer. I selected all ...
0
votes
1answer
50 views

Plugin with QT Creator and Python [closed]

I would like to develop a selection-plugin in qgis. It doesnt run because there is a Problem with the python script. I can select the layer. However, I dont know how can i choose between "ZD", ...
1
vote
1answer
43 views

Pythonic solution for changing shape files properties in QGIS

I'm loading several shape files into QGIS using the python console. The script works by reading a list of directories and a list of shapefiles to load from each directory, then it loads each file. ...
1
vote
1answer
47 views

Resample Raster File in Qgis [closed]

I have an Arc/Info image and I want to resample it in QGIS but I don't know how.. Anyone could help? I have already tried raster-> reprojection -> warp but it didn't work.
2
votes
1answer
22 views

Error message in QGIS using Timemanager

I am using QGIS version 2.14.0 (Essen) and have dowloaded the latest version of the Time Manager plugin in order to do some spatial-temporal analysis. I have imported a csv file into QGIS and made a ...
1
vote
0answers
54 views

Qgis C++ hello world example

i am new in developpement with C++, i try to realise an application with C++ which can read and display a *.qgs file from Qgis, i tried the code bellow but it doesn't work, it always show me errors ...
2
votes
1answer
25 views

How to filter in the attribute table within an attribute name?

I have to create a map with the corridor information in it (in German: Flurstücke). For that, I have one shapefile with the lines and another shapefile (points) with the information about the corridor ...
2
votes
3answers
69 views

DEM polygonize (raster to vector) doesn't work for contour lines less than 1 meter apart? (QGIS)

I tried to make polygon from DEM (geotiff) in QGIS. My requirement is that elevation value was every 0.5m of polygon. If I use the function polygonize (raster to vector) , polygon is created but ...
1
vote
1answer
41 views

QGIS Minidump on opening qgis file

I've a problem with QGIS and I don't know how resolve. A message error "minidump" appear when open a qgis file and I can't work. The QGIS is the new Essen version 2.14. Someone know how I can ...
2
votes
1answer
36 views

csv - CRS undefined, QGIS

I wonder why some csv files when imported (with long and lat) can not set a proper CRS system and other do (CRS undefined). For example: 1) if I export my data in csv with Microsoft Excel it does not ...
2
votes
0answers
38 views

QGIS 2.14. minidump crash when closing program

Every time I close QGIS, I get an error message like this: minidump written to C:\Users\name\AppData\Local\Temp\qgis-20160412-100443-7416-5376-ea85bef.dmp This happened also in the former ...
1
vote
1answer
31 views

QTiles generating blank tiles on QGIS

I need to generate tiles from shape files (which contain contour lines) I've loaded into QGIS. I'm trying to use the QTiles plugin to generate these tiles, but when I run it, it only generates blank ...
2
votes
1answer
46 views

Georeference automaticlly in QGIS

In ArcGIS the function called "Auto Registration" and it can automatically georeference raster Is there a way in QGIS to do the same? I seek in the transformation settings and in the setting ...
1
vote
0answers
14 views

How to export dynamic track (video) from QGIS?

Is it possible to export a file video with QGIS with a dynamic track from point A to point B? I need something like a presentation of a race where a dot is moving along the track from the start to ...
0
votes
0answers
25 views

Problems with QGIS 2.14.1 and GRASS 7.0.3 [duplicate]

I been having problems with modules GRASS / GRASS 7.0.3 in QGIS 2.14.1 I did the installation with Standalone Installer QGIS Version 2.14 (64bit) QGIS-OSGeo4W-2.14.1-1-Setup-x86_64.exe My OS: ...
1
vote
1answer
34 views

Reprojecting: trouble converting MapInfo data to shapefiles in QGIS

I was given a dataset generated in MapInfo. I need to use these files in QGIS, so I imported the .TAB files and saved them as ESRI shapefiles. I then realised the original dataset uses a custom "user ...
1
vote
0answers
29 views

Forcing labels to not overlap in QGIS?

Is there an expression that can be used to force labels to not overlap specifically when there are more than one label per point. I have a map that has over 1000 school names and I am printing it on a ...
2
votes
1answer
27 views

To see the geodata in a PDF is necessary to process something first in QGIS?

I want to see if a pdf file has geographic data and how to access them. In the properties of the PDF document I see the pdf file was made in "AutoCAD Map 3D 2013," and have 6 layers. In QGIS 2.14, ...
2
votes
1answer
18 views

QGIS CPP multi-platform plugin deployment

We're starting to look at porting some of our plugins over from ArcMap to QGIS and we're pretty excited about it. Currently everything we have is written in C++ so it would be nice to use that on ...
0
votes
0answers
27 views

QGIS : How to add points from GPS stream data

I try to place points on QGIS using the GPS plugin but it does not like me. GPS stream is good, I have the read on the data on port com 66, QGIS seems to be good with it since it locates correctly ...
1
vote
1answer
40 views

How to do diagram block with open source software?

I would like to do a block diagram (topographic and geological representation). Is it possible to do this with QGIS (or other open source software), in Windows 7?
3
votes
1answer
43 views

How to display different SVG icon in the same layer in QGIS based on attribute value

Based on this question: How to display different SVG icon in the same layer in QGIS is it possible to add multiple svg files in qgis to the same layer automatically based on attribute value? I have a ...