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

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Is there a tool that is similar to the ArcGIS repair geometry tool in QGIS?

I need a tool in QGIS that has the same functionality as the repair geometry tool (native of ArcGIS).
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30 views

ImportError: No module named processing

this question may have been discussed before but i was not able to find any answer. I am developing a stand alone python script that will invoke methods from processing module. I am seeing error ...
2
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0answers
53 views

Cartographic-complete Maps in PDF On Request using Open Source?

Currently I have some data in PostGIS. I want to implement the following: users will make a request via web, with parameters like location, scale, layers to be displayed, etc. and I need to provide ...
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1answer
29 views

align scale bar with PyQGIS

I am making several maps from a template with a PyQGIS script and I am having problems to align the scale bar on them. My code is: # create scale bar item = QgsComposerScaleBar(comp) ...
3
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1answer
28 views

Save project with layers as one compiled file [duplicate]

this may be a rookie question: Is there a way to save a QGIS project as one large file that includes the layers it points to? I am working with Tecplot quite a bit, which has the option of referencing ...
4
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2answers
232 views

How to identify polygon/point shapefiles in python?

I have a script which performs various functions on shapefiles, most of which are polygon-based. However, some shapefiles are point-based and I have to specify where these files are by editing the ...
2
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1answer
23 views

QGIS - Edit UI - Python Init function localization with QTranslator

I have interaction with layer defined by custom designed UIs. In layer properties the following settings: Edit UI - customline.ui and Python Init function: customline_set.py. #coding: utf8 from ...
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0answers
36 views

Error running polygonize from QGIS!

I'm trying to vectorize a raster image and when I'm running polygonize within QGIS 2.6.1. I'm getting the following message: Traceback (most recent call last): File ...
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1answer
26 views

is possible creating Geowebcache tiles offline

When I start geowebcache seed mechanism, my server CPU is working %120 persentage. And I can not use WMS service on my openlayers application because it is working very slow. Server sources are ...
2
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1answer
47 views

How to make label show up on contour vector in QGIS? [closed]

I'm new to QGIS (version 2.6.0). I think my question should be easy to solve but I still get stuck at making labels show up on contour lines. These lines were generated from extracting raster (asc ...
2
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0answers
18 views

dxf to shp conversion areas mismatch

I have added a dxf file in QGIS and saved it as shp file. the problem it that the area of the the polygon in shp. file is 1% more than the area of polygon in dxf. just to double check i have exported ...
1
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1answer
31 views

QGIS search works, layer save does not?

Im using QGIS 2.6.1 Brighton on an IMac with OSX 10.8.5. QGIS 1.8 worked on the same machine, as did QGIS 2.0. AFter installing 2.6.0 and then 2.6.1 I opened a file I'd used before and several queries ...
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1answer
30 views

buffering very short line segments with a flat end

I need to buffer a collection of line segments, with a flat shape (corners) at the line ends, as opposed to round. 99% of them work fine in ArcGIS, but some individual line segments are quite short ...
2
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1answer
96 views

Why can't I open .asc files in QGIS?

Further to my earlier question, I have .nc and .asc files of crop area and production for maize, rice and wheat. It says here, about QGIS importing .asc files: QGIS has native support for this ...
2
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0answers
36 views

How to install QGIS with ECW support on Mac?

I bought a imac recently and I tried to install qgis: without success! It is not possible to read the raster files. I installed GDAL ECW plugin, but it is necessary to copy and paste another file ...
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0answers
17 views

proj.4 definition for (obsolete) UK War Office “Italy South” grid

I'm helping a friend convert his late father's war diary coordinates to WGS84. I have a proj.4 definition that appears to work in QGIS, but if I transform a scanned map with gdalwarp, it's not even ...
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0answers
16 views

Qspatialite not loading in QGIS 2.6.1 for Mac

I am running QGIS 2.6.1 on MacOS (Mavricks). I have reinstalled the Qspatialite plugin, and am still encountering the same issue. The plugin will not open. Has anyone seen/over come this issue? Any ...
1
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1answer
27 views

Where do I find the legend for netCDF files in QGIS?

I'm using QGIS to make maps of the maize, rice and wheat cultivated area at global level. I found these great netCDF files: http://www.geog.mcgill.ca/landuse/pub/Data/175crops2000/NetCDF/ Here's an ...
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52 views

First steps on QGIS (examples)

I have just installed the QGis dev library to use it with qtcreator. I have also download some examples. So I use the .pro file in qtcreator and I compile it. The compilation result send me errors: ...
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33 views

Alignment by expression is not working after using “wordwrap” instead of “wrap on character”

I'm using wordwrap in the expression dialog to wrap the field "name" after the 12th character (first line) and the 20th character (second line): wordwrap( wordwrap("name"),12),20) So far so good. ...
5
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0answers
70 views

Split polygon by area using ArcGIS for Desktop (or QGIS)?

I'm interested to split a larger, irregular polygon into smaller ones. I know the area of the resulting polygon, and I know that the line I want to split it by should be parallel to one of the sides ...
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29 views

can't install qgis qgis 2.6.1.1+unstable1 by ubuntu software center

When I click install get an error : InstallArchives() failed: Extracting templates from packages: 56% Extracting templates from packages: 100% Extracting templates from packages: 56% Extracting ...
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23 views

QGIS SAGA Channel network error: Input layers do not have the same grid extent

I am trying to follow along with this exercise using my own DEM. I have done the first step, creating the catchment area, with no trouble. When I try to run the Channel network algorithm, however, I ...
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1answer
35 views

QGIS Change file browser/chooser default location

Is there a way to change QGIS file browser default location? Currently it points to bin folder of QGIS installation C:\Program Files (x86)\QGIS Brighton\bin.
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0answers
13 views

GRASS 6.4.4 vector command in crashes QGIS 2.4 (g.gisenv.exe has stopped working)

I am running Windows 8.1 64 bit, and have QGIS 2.4 and 2.6 installed. When I try to use a GRASS 6.4.4 vector command (specifically v.clean), I receive an error message in an endless loop, and the only ...
2
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1answer
71 views

Getting started with QGIS, but can't find sample data files on my machine

I'm just getting started with QGIS. After installation, the User Manual directs you to load raster and vector data. It says "browse to folder qgis_sample_data/raster/." Well, that folder does not ...
2
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1answer
76 views

How to host the results of qgis2leaf on google drive?

I am wondering how to host the results of the plugin qgis2leaf on google drive to create a free hosted webmap? Here is an example: ...
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1answer
57 views

Adding a Style to QGIS

I've downloaded the VA Geological Survey data set (http://mrdata.usgs.gov/geology/state/state.php?state=VA) that I have already on Google Earth as a kmz. The various formations are color coded. ...
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1answer
28 views

How can I add a graticule similar to the DeLorme Atlas to a map in QGIS? [duplicate]

I've got a map in NJ State Plane (Feet) projection and want to add a grid to it with lat and long intervals of 1 minute, and 0.1 minute tick marks. I'm trying to do this in the grid tab in the print ...
2
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0answers
18 views

In version 2.4 vector layers with labeling switch off caching

I am developing a map display stand alone application using the C++ API. With version 2.6 the caching mechanism is ignored for vector layers with labels. The reason is to avoid conflicting labels. ...
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1answer
24 views

Repair Corrupted QGIS Map Document

I have a series of QGIS map documents that have all branched out from a common ancestor that are, as of QGIS 2.6 causing quite a few crashes and issues while using print composers or while doing a ...
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16 views

Microstation Elements created in QGIS

In my workflow I typically, in Microstation V8 2004 Edition, manually place a shape element around a series of imported coordinates to use as a fence for loading point cloud data in TerraScan. I am ...
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23 views

Error installing Photo2Shape QGIS 2.6 for Mac

I am trying to install the Photo2Shape plugin for QGIS on a Mac (10.9 Mavericks) but I am getting the following error: The plugin is broken. Python said: No module named exifread I have installed ...
3
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0answers
69 views

Preserve datatypes when using SQLite and QGIS

Following Nathan's SpatiaLite/DBManager solution in this answer, I find that once the layer is loaded from DB Manager into QGIS (2.6.1), any calculated fields are appearing as text values instead of ...
2
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1answer
28 views

Relocating & resizing complex shapefile with OpenSource Software

(please excuse my poor english) I do have a polygone shapefile of an archaelogical site with elevation data of 10cm steps and I dont get hands on the raster data as it was collected by the drone. My ...
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0answers
41 views

How to eliminate sliver polygons with QGIS [duplicate]

I need to remove sliver polygons within a shape, but using QGIS 2.6 generates some failures to the process. I mean the program freezes or shuts down and I don't know why. Maybe there's a bug or it ...
3
votes
1answer
67 views

How to perform tree birthrate and mortality research with GIS [on hold]

I'm using QGIS 2.6 and have 4 layers of polygons. Each of these polygons describes the outline of a tree, based on airborne imagery. My goal is to find the relations between every synchronously ...
2
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0answers
17 views

PyQGIS: Using a Simple Coordinate System (Cartesian Space)

Is there a built in non-world coordinate system that represents simple cartesian space? I want to use PyQGIS but have a canvas set with 0,0 origin and infinite planar space in each direction. In ...
2
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1answer
40 views

How to calculate area using QgsDistanceArea?

I am trying the following code as given in the QGIS documentation: d = QgsDistanceArea() d.setProjectionsEnabled(True) print "distance in meters: ", d.measureLine(QgsPoint(10,10),QgsPoint(11,11)) ...
0
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1answer
47 views

Delete duplicate geometry in postgis tables

After - I dont know what happend - all my entry's in my postgis tables are doubled! I tryed that to delete them but it does not delete any/all duplicates: DELETE FROM planet_osm_point WHERE ...
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0answers
43 views

QGIS Topology checker wrong results?

I am trying to understand topology checker results and frankly i dont get it - probably i am doing something wrong. Source - Point layer Target - Polygon layer Must be inside - that is working as ...
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0answers
22 views

How to delete lines that do not overlap a polygon? [duplicate]

I'am new to QGIS and I run into a problem. I have two shapefiles, one with line data and one with polygon data. I would like to remove all the lines that do not overlap the polygon. So remove all ...
3
votes
2answers
67 views

How to combine two string replace functions in one expression?

I would like to change some of my street labels like "Musterstraße" into "Musterstr." or "Muster Straße" into "Muster Str." I already did that for the first case: replace("name", 'straße', 'str.') ...
2
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0answers
34 views

How to split a polygon into quadrants in R/Qgis?

I am solving the same problem as How to split a polygon into quadrants?, except that I am looking for a solution in R or QGis. So I have a polygon layer shapefile, which is unfortunatelly not exactly ...
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0answers
32 views

How to develop c++ standalone QGIS C++ Application

I want to integrate QGIS in QT\C++ application. I try to write basic C++ apllication to render map and build it using MSVC 2010. class PostGisViewer: public QMainWindow { public: PostGisViewer(): ...
2
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1answer
34 views

Is there a python version of qTuio? [closed]

Is there a python version of qTuio? qTuio is implemented in C++. However, I am currently trying to use pyqgis due to problems with C++ environment (I cannot even create a raster layer). Any help is ...
1
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1answer
36 views

QGIS Calculate distance between polygon vertices / find vertices that are within distance

I have polygon layer and i need to find (select, so i can export selected to new layer) all the vertices that are in provided distance to each other (like 2 meters). I already tried: 1. Export ...
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1answer
32 views

QGIS how to align existing polygon borders

I'm looking for a method to align the borders of two overlapping and already existing polygon layers. I'm aware of the node tool and its tolerance snapping option, but the area I'm working with is too ...
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0answers
14 views

Importing Data Dictionary (DDF) into QGIS (Fields)

Are there any tips/tricks on getting all the Attributes from a data dictionary for a GPS unit to sync with the Fields in a QGIS style? Right now, in order to update the drop-down options in QGIS, I ...
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0answers
22 views

Interpolation plugin from PyGIS? [duplicate]

How to run this plugin from PyQGIS?? http://docs.qgis.org/2.2/en/docs/user_manual/plugins/plugins_interpolation.html