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Questions tagged [qgis]

QGIS is an open source program used to process and visualize geospatial data. It is available for most desktop and mobile operating systems.

QGIS (formerly Quantum GIS) is a user-friendly, cross-platform Geographic Information System (GIS) application with support for Linux, Unix, MacOS X and Windows. News updates are available from the QGIS blog.

QGIS supports numerous vector, raster, and database formats and provides numerous features for exploring, creating, analyzing, converting and exporting geospatial data. The core functions can also be extended through external plugins written in .

QGIS is an official project of the Open Source Geospatial Foundation (OSGeo) and is licensed under the GNU General Public License.

The gis.stackexchange.com site covers QGIS use cases in detail.

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Unresolved symbols while building QGIS

I've been able to get ahead from this step: Building QGIS source code on Windows 7 - Not working I'm trying to build the latest QGIS(2.10.1) using Visual Studio 10 Express but getting these unresolved symbols while building "ALL BUILD". In the…
user5858
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How do I change a QGIS buffer size?

I am trying to make buffers around points on a map in qgis. For some reason, when I try to make buffers, they take up a lot of space on the map. I ensured that my CRS is the same as the map, which is WGS 84. Does anyone know why the buffers are so…
Madeline Lawler
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How to profile performance in a QGIS Python plugin?

Is it possible to use kernprof.py, line_profiler.py, or something similar to profile a QGIS plugin? I can't run the plugin outside of QGIS because the plugin requires state from QGIS & will make calls to the QGIS API. It seems like I might be able…
jakop
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using python multiprocessing package inside a qgis plugin code

I spent quite a bit of time looking on how to use the multiprocessing package, but couldn't find anything on how to use it inside a plugin in QGIS. I am developing a plugin that does some optimization for several elements. I would like to…
Olivier
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How to install pandas library in QGIS python?

I'm building a QGIS plugin and using Python Pandas library. How to install Pandas library in QGIS python? Please help me !
Lion Pham
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QGIS PyQt4 missing QString class

i was trying to use a QString in the QGIS Python Console. from PyQt4.QtCore import QString but it says: ImportError: cannot import name QString In my Python IDLE it works fine, but i know that QGIS brings its own PyQt4. What could be the problem…
Hinne123
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Count number of points in multipolygon shapefile using Python

I have a polygon shapefile of the U.S. made up of individual states as their attribute values. In addition, I have arrays storing latitude and longitude values of point events that I am also interested in. Essentially, I would like to 'spatial…
wuffwuff
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Import csv into QGIS using Python

I am attempting to import a file into QGIS using a python script. I'm having a problem getting it to accept the CRS. Code so far from PyQt4.QtGui import * from PyQt4.QtCore import * from qgis.core import * from qgis.utils import iface ----1 Set…
Markm0705
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QGis 2.4 C++ helloWorld

In the project I'm working on (C/C++/Qt application), we are trying to integrate QGis (latest version desirable, 2.4 for the moment). But there is very little information in the web on how to use QGis C++ API. To start I wanted to write a simple…
Kalitine
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How to align QProgressBar label in QGIS messagebar?

Unable to align the QProgressbar label in Qgis Messagebar. see the image below While progressbar is updating,the label is vanished. so i tried the alignment for progressbar as shown below but its not working. My code is: widget =…
venkat
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Qgis web client / Openlayers

I need your help. I use the Qgis web client and I want to use codes like this: map.events.register("click", map , function(e){ var opx = map.getLayerPxFromViewPortPx(e.xy) ; ... ... I tried to insert this code in nearly every js-file in the…
user1857019
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Qt Creator build project - No such file or directory

Sorry to being a noob, but I just moved from Window, Eclipse and Java to OpenSUSE, C++ and Qt Creator, and I met a problem. I am working to create a QGIS application, I have the *.h files in /usr/include/gqis, and *.so files in /usr/lib. I added…
Anh Tuan
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Shapefile dBase Data (naturalearthdata.com)

I'm researching using natural earth for a software project, so I pulled down a sample data file and had a peek into its dBase file, namely ne_50m_admin_0_countries.dbf Here is a sample row from said file: ScaleRank = 1 LabelRank = 1 FeatureCla…
fieldtensor
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Workaround for 60 maximum results limit from Google Maps Platform

i've been working with googleway packages to retreive information using place_type key, but i've been stuck with the 60 results limit restriction. I'm trying a slightly different approach to deal qith this restriction: divide an conquer. In my work,…
Neri David Martinez
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Why does QGIS creates multiple connections for PostgreSQL Server?

We have a PostgreSQL database with PostGIS running and today we ran into the issue that too less connections were available. Mostly we are using QGIS to access the database. We realized that issue because multiple users got the following…
JBecker
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