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

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4
votes
1answer
282 views

Debugging errors of SAGA interpolation algorithms in QGIS 2.0 Processing

I encounter recurrent problems with the geoalgorithms that perform interpolations. No matter technique I use I end with the following errors. As state in OGR tab QGIS is unable to open a file in C ...
2
votes
2answers
66 views

Join by location on Qgis when target layer has multiple layer

I posted here a while ago about spatial joins. I have a huge dataset (20,000?) of bird and mammal ranges. I have another dataset of all the countries. In qgis, I was attempting to link the two ...
2
votes
2answers
67 views

How can I display a spatialLite view in a custom data sheet with print composer

I created a spatiaLite Database with a point layer (every point is a tree). Additional I created several tables to fill the columns of the spatial layer with attributes using the editing widget “value ...
3
votes
1answer
304 views

How do I access QGIS program settings programmatically?

I am trying to temporarily enable the option in QGIS using PyQt4 to suppress the attribute dialog popup after a feature is added. I found an example in the cookbook but it doesn't indicate how to get ...
2
votes
2answers
2k views

How to cut a line feature in QGIS 2.0?

I want to shorten a feature (a polyline representing a road) in QGIS 2.0. I tried the 'cut features'-tool that look like a pair of scissors. First I chose the right layer, and then clicked 'Toggle'. ...
2
votes
1answer
389 views

Display plugin icon [closed]

I'm unable to setup the display of the toolbar icon for a plugin in QGIS 2.0. I have compiled the "resources.qrc" with the correct path and filename, and checked possible spelling errors in the code. ...
2
votes
1answer
568 views

Creating a custom attribute table in qgis print composer

is it possible to arrange header and content of an inserted attribute table in qgis print composer? I want to create a custom datasheet with a small map and listed feature information as follows: I ...
1
vote
1answer
667 views

How to apply svg symbols as point markers in QGIS 2.0

I must be overlooking something obvious! I've just downloaded and launched QGIS 2.0. I'm trying to edit a layer's symbol markers to use a more descriptive icon. Opening layer properties and then ...
3
votes
1answer
2k views

how to fix greyed out edit button

I created a QGIS map, which I was able to edit (right click on layer and select toggle edit, or use button in tool bar). Having returned to work on the plan, most layers now have this button greyed ...
2
votes
1answer
165 views

What prevents GRASS and SAGA integration into QGIS when users aren't administrators?

Windows version of QGIS 2.0 using the stand alone installer. I have been able to tie up the functionality using the Options and Configurations settings in the Processing menu. This works fine in a ...
0
votes
0answers
91 views

QGIS 2.0 Performance issue when selecting by location on a complex dataset

I have an issue when I use the select by location tool in QGIS 2.0 to select points within a very complex polygon. It is flood data, so has something like 350,000 nodes and is generated as a single ...
0
votes
1answer
75 views

Dissolving polygons closers than 50m into a single shape QGIS

I’m new with GIS (coming from a CAD background) and using QGIS 2.0.1. I have a very detailed map of urban fabric in a UK region, to the detail of individual buildings. I want to simplify that map by ...
1
vote
2answers
748 views

Alternative repository for QGIS 2.0 plugins

Is there any alternative to the official repository for plugins of Qgis 2.0. I prefer to be a tested and trusted. EDIT: I found a source which refers to OpenGeo Explorer For more info: ...
4
votes
1answer
362 views

lookup forms in QGIS

Bit of an open question but.... Is it possible to design a form in qt designer that will be used as a form against a qgis layer but interacts with a different table in postgres/postgis as a lookup ...
0
votes
1answer
106 views

error in overlapping layers in QGIS

I created two tables with PostGIS, within which I have inserted a shapefile of an Italian region (Apulia) in the first, and the coordinates in the second table. In both tables are set with the ...
0
votes
0answers
111 views

Point features disappear when moved using QGIS 2.0

When I move, either by the node or the move function, a feature symbol on the map canvas, it simply disappears, not just the label, the whole thing. CTRL-Z brings it back. I'm using a MAC OS-X. I've ...
2
votes
4answers
956 views

Merge large number of polygons using QGIS

I have a series of polygons that are the output of another GIS program - I need to merge the polygons into a single polygon. I have tried a couple of different methods with no luck. I have tried to ...
5
votes
2answers
893 views

How to define leaders to a label in QGIS 2

In QGIS 1.8 and 1.9 I used a plugin called Easy Labels to develop leader lines that would be saved as a memory layer. I have not been able to replicate this with QGIS 2.0, I cant even find the Easy ...
3
votes
3answers
575 views

How to calculate peaks in a DEM

How could I extract all peaks from a DEM (large mountainous area)? Peak means something like: a pixel which is sourrounded by other pixels with smaler elevation numbers in a area arround the ...
5
votes
3answers
522 views

How to visually sort the order of Points with QGIS, GDAL, …?

The following Points layer is the basis of a rendering in a Android application. Android allows to draw a shape from the provided points. I cannot use LineStrings. However, the order of points ...
2
votes
1answer
212 views

How to show in a custom QGIS form the feature and/or geometry info?

I need to show point coordinates on the from dialog used to edit the attributes of a point.. I see that in the formOpen the dialog receives a layerId and a featureId, but no iface object, so how can ...
6
votes
3answers
291 views

How to find out if OpenStreetMaps contains low emission zones?

Since I never really digged into the data contained in OpenStreetMap I ask myself what would be the recommended way to identify layers or tags within the overall data. In my current use case I want to ...
1
vote
1answer
302 views

Is it possible to load automatically a customization file in qgis?

I have customized QGIS menu and toolbars thanks to the customization option and I have created a configuration.ini file that I can load on several machines. Now, is it possible to create a project ...
2
votes
1answer
734 views

QGIS OS grid overlay

I'm totally new to GIS. However, I've proudly managed to create a map, which is correctly geo-referenced with a Great Britain Ordnance Survey (OS) background (streetview level) and I've added some ...
6
votes
1answer
964 views

How do I convert a .dxf to a .shp containing a field with height information in QGIS?

I received two .dxf for my project that represent my area of interest. One of them contains buildings, the other one terrain elevation. They both are 3D. I can convert them to shapefiles successfully ...
2
votes
1answer
2k views

Replacing all null values from attribute table with zeros using QGIS?

I have a new column in my attribute table with a lot of null values and I want to replace all them to zeros. How can I do that in field calculator? I'm using QGIS 1.8
1
vote
1answer
85 views

Mismatch in area calculation using Field Calculator vs Group Stats in QGIS 2.0

I have two polygon files (A being my area of interest and B being a categorised land cover layer). Both layers were in the same projection (projected and not geographic). Using QGIS 2.0, I used the ...
0
votes
0answers
108 views

QGIS and raster calculator - not working

I have installed QGIS 1.8 on a Mac OS v10.8.4 (with GDAL and installed), and trying to create an NDVI map from a three-band GeoTIFF multispectral image. Even the simplest calculation (e.g. band@1*1) ...
2
votes
3answers
123 views

How to highlight polygons within another polygon?

I want to symbolize public buildings in OSM data. For Example: There is a polygon and in column "amenity" it has the value "school". But i don't want to highlight this polygon, but the buildings ...
2
votes
0answers
345 views

QGIS, “Handle bad layers” and empty layers

I'm a novice in GIS, so forgive me all possible mistakes I might have here... I'm using QGIS 2.0.1. (Dufour) with Mac OS X (10.6.8). I have couple of dozens(?) of vector layers added on a project. ...
2
votes
1answer
110 views

Irrational feature ID behavior in a PyQgis script

I've written a script to determine the coordinates of a point shapefile and insert them into its attribute table. It works perfectly when the ID sequence of the indiviual features begins with 0, yet ...
1
vote
0answers
108 views

How to load a SVG-File from QRC

I have a vectorlayer and want to give the points a svg-symbol. If I give the constructor an absolute path to my svg-file it works fine. Then i put the svg to my ressource file (qrc) and try to load it ...
2
votes
0answers
322 views

QGIS 2.0.1 connecting to ESRI WMTS jpeg vs jpg

I'm currently trying to troubleshoot an issue I have connecting to ESRI WMTS services. Esri ArcGIS Server seems to provide the format as JPEG via the rest service, but in the get capabilites ...
1
vote
1answer
988 views

How does MMQGIS geocoding tool work?

Hi all and thanks for any help. I try geocoding locations from csv file in qgis using mmqgis with no success. is there a log file where i can see the error massages? lets use one of the record as an ...
1
vote
1answer
240 views

Problem changing CRS to enable clip function

I have two layers, one point file and one polygon. The point file is in WGS 84 and polygon in NAD83-UTM10. The project CRS is NAD83-UTM10. They project fine with on-the-fly projection turned on. I ...
1
vote
0answers
264 views

QGIS Graphic Modeler issues with Raster Calculator

A colleague and I have downloaded QGIS Dufour and are trying to use the Graphical Modeler to carry out a raster subtraction with a DSM and a DTM. This fails using both the Grid Difference and Raster ...
0
votes
1answer
98 views

How can I access second (or even third) level attributes in a vector layer and add them to the attribute table? [closed]

I got some .dxf file containing buildings I need for my map. The file loads nicely into QGIS and I converted sucessfully to shape. I still can find the Information I need (the buildings height) in the ...
0
votes
0answers
309 views

export from .shp to .gpx and .kml fails

I've just upgraded to QGIS Dufour and I am having some problems with the exportation of a simple track from .shp to .gpx and .kml format. I imported from mi smartphone a .gpx track (SR WGS84 ...
3
votes
1answer
169 views

Workflow Scripting in QGIS

I have created a hexagonal grid shapefile using MMQGIS and want to use this for hexagonal binning. I have another point shapefile which contains patient records for three different types of hospital ...
1
vote
1answer
170 views

What is the best way to display point data (with standard deviation) using QGIS/SAGA/Manifold? [closed]

I would like to display point data values (indicating biomass at a point) but also to show the standard deviation value for each point. What would be the best method to do this in QGIS (I'm a basic ...
1
vote
1answer
86 views

My Coordinate Reference System listing is in the wrong language

I just installed QGIS Desktop 2.0.1 on a desktop (Windows 8-64). All the menus are in English-US (as they should be), but the CRS listings -- when I try to change them for a project are a layer -- ...
0
votes
0answers
38 views

Sorting individual points by shapefile overlay

I have a couple hundred individual locations across Australia saved in a KML/KMZ file. Is it at all possible to use QGIS or something similar to sort these individual locations into a statistical area ...
1
vote
1answer
303 views

Polyline (shp) layer not displaying correctly in QGIS

I'm a new QGIS user. I'm trying to convert a polyline vector layer to polygon. I tried to it in ArcMap 10.1 but it misses a lot of polygons. So, I'm attempting to this in QGIS running the process ...
-2
votes
1answer
562 views

Making Map Matching Points to Roads [duplicate]

I'm having some trouble while map matching these points for some streets. Could you lend me a hand?
3
votes
2answers
729 views

Delete files that were used in python code

I have a code that creates some tif images in .qgis2 folder, but I want, in the end, delete these files. How do I do that? I try with os.remove but it gives me the error32, that said that the process ...
1
vote
1answer
204 views

Creating a point buffer along a road network [duplicate]

I have a road network and have added points indicating fire hall locations. How would i go about creating buffers on those points following the road line. The result am i looking for would create a ...
0
votes
0answers
307 views

Why does my QGIS plugin MainWindow start with some widgets not drawn?

I have a QGIS plugin written in Python which uses a MainWindow to hold a few other widgets. When the window first gets shown, some widgets are drawn and some are not. When I resize or minimise/restore ...
0
votes
0answers
52 views

SQL questions testing pgRouting 2.0

Following the post:pgRouting 2.0 for Windows quick guide, cuz I have some problem with DB manager(here is the problem I posted:DB manager in QGIS 2.0), I skip DB manager and save the test shapefile, ...
1
vote
1answer
166 views

DB manager in QGIS 2.0

I followed this post:pgRouting 2.0 for Windows quick guide, and I want to use DB manager to load the test data into my PostgreSQL database. I used url to get the test data: I have set up the ...
1
vote
2answers
410 views

Splitting discontiguous vector feature in QGIS

I'm a QGIS novice. I'm trying to correct a map of Europe in QGIS, and it's incorrectly assigned Corsica to Germany. I can't seem to split Corsica off of Germany because when I use "split features" to ...