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

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9
votes
6answers
4k views

How to georeference a vector layer with control points?

I have a non-georeferenced vector layer that I need to be georeferenced. With raster layers the task is easy and straightforward, but I have no idea what should I do with my vector layer. I have a few ...
2
votes
1answer
175 views

Keyboard shortcut for GPS data capture in QGIS

I would like to setup keyboard shortcuts for GPS data capture with QGIS. Using GPS Information dialog box, I could use Mouse-Left-Click to "Add feature" and "Add track point", but I would like to ...
4
votes
4answers
240 views

How to measure without coordinates?

My current Project is to "map" a turntable in qgis. I know, very unlikely but that's what my teacher wants. My teacher also wants me to measure something in this project (Very specific, isn't it?). ...
4
votes
2answers
541 views

How to enable GRASS plugin in QGIS 1.8.0 (Linux Mint 13 - 64 bit)?

Every time I enable GRASS plugin in QGIS (Plugins -> Manage Plugins -> GRASS), I got a message: Exception - G_getenv(): Variable GISDBASE not set. I googled and found some information here but don't ...
3
votes
1answer
899 views

How can I use MOBAC atlases in GIS Software (e.g., QGis, uDig)

How can I use the output from MOBAC (Mobile Atlas Creator) as background layer in open source desktop GIS software (e.g., QGis or uDig, TileMill etc.)? My goal: To put my question into context: I ...
2
votes
3answers
315 views

How to save a QGIS workspace with database link for offline use?

Is it possible to save current workspace of QGIS for offline usage like in mapinfo? My workspace has link to database. and when I reopen workspace unlink in mapinfo it can't open it.
4
votes
2answers
296 views

QGIS Two Raster Data Sets with black line between the two sets where they join?

Where the two Digital Raster Quad sets (topo maps 7.5 Quad) overlap there is a significant thick black line (not a single line but wide and is wider the further south you go on the map). I am looking ...
2
votes
1answer
600 views

How to split geometry collection into its items using Python and QGIS API?

I'm getting some geometries via intersecting lines by polygons (somewhat blindly - I don't really know if intersection exists and actually I don't need to know) using python and QGIS API: ...
3
votes
1answer
1k views

GDAL VRT Format - do i understand the concept?

Okay, so im a little fed up with different raster-in-database solutions that I tried over the last 2 weeks which don't work currently (Postgis raster) or cant handle my volume of data (Rasterlite), so ...
-2
votes
2answers
377 views

Problems with upload waypoints to GPS unit

How can I upload waypoints from QGIS to my Garmin GPSmap 62 by using GPS Tools in plugins? I only manage to do it with an older Garmin GPS. Regards Kaja
-2
votes
3answers
992 views

Define area of study in Google Earth before Import in Qgis

First, I would like to thank you, for your answers. Here is my problem: I wish implement a GIS solution to manage a water and wastewater network. In my project I have any map for use it like ...
3
votes
2answers
1k views

Extract WMS Data

I am trying to extract geological information from the onegeology portal unfortunaley most of the data there only consists of WMS data. For example, is it feasible to extract a particular legend ...
2
votes
2answers
566 views

Trimming Specific Text Values in QGIS Field Calculator

Sorry if this is a dumb question, but I am wondering if there is a way to copy the text from one field to a new field, but eliminate specific words. For example: **Old Field** ...
1
vote
1answer
82 views

Reordering Category Layers in QGIS

I was wondering if there is a way to reorganize the layers when applying a style based on a categorizing value? I have many values, but I would like to rearrange them alphabetically. In ArcMap there ...
4
votes
2answers
1k views

How to draw polygons in QGIS perfectly aligned

I would like to draw polygons for an indoor map test and would like to draw perfect rectangles (horiz. and vertical edges). How to set QGIS options on polygon edit /draw to do that ? thank you for ...
5
votes
3answers
5k views

How to add my own symbols to the single-marker or svg-marker selection list?

I was creating an arrow for a line layer. So I was adding the triangle as a single marker to the line. So far so good. But when I would like to create my own single-marker symbol or svg marker how can ...
10
votes
2answers
1k views

How to buffer a line with different distances for left/right sides

How can I buffer a line in QGIS using one attribute for the left side of the line and one attribute for the right side of the line? I am trying to buffer a river with its bank width, which is ...
3
votes
2answers
917 views

Can I fix 'qodbc3:unable to execute statement' when querying SQL Server 2008?

I was testing features of QGIS and its really cool.I tried to query each table using right click and query but I can't query sql server 2008 database : Error: An error occured when executing the ...
1
vote
0answers
315 views

Import KML or KMZ files into Qgis [duplicate]

Possible Duplicate: Can QGIS open KMZ files? Is it possible to import Google Earth generated KML or KMZ files into QGIS and then use these files as background data for a project? I intend ...
4
votes
2answers
1k views

Adding a hotlink to an attribute field in QGIS

How to add hotlink to QGIS? I saw this but had some problem. I want to open network location like \\fileserver\filefolder\file1.excel but it ends with error. Edit: The network location is stored ...
3
votes
1answer
575 views

QGIS installation on lubuntu (LXDE)

I'm unable to install QGIS on lubuntu (LXDE desktop). This is what it says on the terminal: Package qgis is not available, but is referred to by another package. This may mean that the package is ...
2
votes
3answers
398 views

Problem with v.in.ogr.qgis in QGIS

I received a shapefile containing data from a topographic survey of a farm. The file has a lot of lines containing elevation data. The person who made the survey did it with a GPS set up on a ATV. ...
1
vote
1answer
387 views

Is there alternative to tools like MIPT and Discover in QGIS?

I am getting fond of QGIS but I am unable to find tools for frequency plannig and other stuff. Are there any alternative to MIPT and Discover of Mapinfo in QGIS? MIPT is used for frequency planning ...
3
votes
3answers
1k views

import kml in qgis : kml.kml is not a valid or recognized data source

When I import kml.kml (generated from ArcGIS) into Google Earth, there is no problem. However, when I try importing this file as vector layer in QGIS 1.8 on XUbuntu 12.04, I get this error : kml.kml ...
1
vote
1answer
340 views

Error occured decoding the epsg code - 3857 (Web Mercator) [closed]

I'm trying to add the following wms service to QGIS using EPSG:3857 and get the following error: Service (running on L/A/P/P geoserver): http://66.228.57.208/geoserver/wms?tiled=true or non-cached ...
3
votes
0answers
165 views

How to do bivariate or multicriteria line symbolization in QGIS?

Bonjour, je cherche à faire sur Qgis un tracé d'un itinéraire avec comme légende une couleur pour le type de route et la largeur du trait pour la fréquentation de cette route. J'ai vu qu'il était ...
0
votes
4answers
832 views

How to use Dealul Piscului 1970/Stereo 70 (EPSG:31700) with Google Mercator?

To open Google layer I use OpenLayers 0.93 plugin, the base layer has CRS "Dealul Piscului 1970/Stereo 70 (EPSG:31700)", the Google layer is set to "Google Mercator (EPSG:900913)". The same base ...
4
votes
2answers
988 views

Snapping two polygons together

I have a problem with two vector layers, both polygons. I have been digitising an historical map which contains large areas called townlands, filled by smaller areas called fields. I digitised both as ...
1
vote
1answer
184 views

Qgis mapserver - Can it use plugins you use in qgis desktop?

Im thinking about developing a small python plugin for qgis which would access postgis raster database and return data via ST_AsPNG() for example. But since i need this in my wms, would it be possible ...
1
vote
2answers
1k views

Exporting selected feature to google earth in QGIS?

Does anyone know if there is a plugin for QGIS that will export features to google earth similar to the one for MapInfo? Thanks, Alan
5
votes
2answers
954 views

How to create curved labels in QGIS

I added an image, that explains my demand (see Schiefelsbach river). How can I do this? thanks
2
votes
1answer
451 views

Are features of new labelling tool available to control via Python API?

I am writing a plugin using Python and currently using methods that set the label similar to those seen under Layer Properties. Some of the features under the new labelling engine available on the ...
3
votes
0answers
170 views

How to create unfilled circles (style) for point layers?

I have a point layer and want to visualize it with unfilled circles. It is only possible to change the colors and size of the symbology layer (single mark). But I would like to change the filled ...
3
votes
3answers
336 views

Installing the development files libqgis-dev in Ubuntu 12.04

I am trying to install development files which include the headers and the libraries for qgis in Ubuntu 12.04. I used Ubuntu software center, synaptic and the terminal and am still getting the same ...
1
vote
0answers
126 views

How can I make my labels scale dependent?

I present labels from a textlayer and make the visibility dependant from the zoom. However when I save the project and reopen it, the zoom is grayed out. The project does not keep the inserted zoom ...
6
votes
2answers
666 views

Can I install two versions of QGIS on the same computer?

I thought a few weeks ago someone asked a question about running multiple versions of qgis on the same computer. But I can't find it back.
1
vote
1answer
570 views

How to convert a polygon to a grid of polygons using QGIS?

For example, the city of Rotterdam represented as a hexagonal grid.
4
votes
1answer
1k views

Can I access a raster attribute table in QGIS?

I have some Python code that makes Raster Attribute Tables for GeoTiffs using GDAL. In ArcGIS I can see these attribute tables fine and they behave how I like (as classifications). But in QGIS the ...
1
vote
0answers
87 views

System policies prevent QGIS installation - false alarm?

I get the following message during install Quantum GIS 1.8.0-Lisboa on Windows 7: I tried doing the install as administrator with the same result. The install finishes after the 'ok' button is ...
0
votes
1answer
249 views

Problem using qgis when I upgraded to osx 10.8.1

I have been running qgis in Mountain Lion for a few weeks now, but when I upgraded to OS X 10.8.1, qgis would no longer work. I get an error saying: QGIS cannot be opened because of a problem. Check ...
4
votes
1answer
337 views

Can I run tools from QGIS using shell commands?

Is it possible to script rutines in QGIS (python) and then runing them remotely? To illustrate, can I through a shell (ssh or telnet) ask to QGIS to transform a shapefile into a gjson format? Mostly, ...
2
votes
1answer
198 views

How to apply the same style to different columns of the attributes table?

How do I apply the same Categorized style, including same custom intervals and respective labels, to more than one column, if I have a shapefile with an extensive attributes table? If I save a style ...
10
votes
4answers
8k views

Is there a SVG symbol library for qgis?

Im currently using default simple symbol capabilities or dingbat fonts for point objects. Is there maybe a SVG symbol library for qgis that is a bit more extensive than that which is included? I've ...
10
votes
8answers
18k views

How to import a DWG into a QGIS project?

I have a lot of DWG files like base map, and water and wastewater network. I am lookin for the principal steps to import my files into my QGIS project.
5
votes
3answers
959 views

How to produce a singlepart featureclass with unique IDs for each spatially non-connected polygon?

What is the best method to convert a singlepart shapefile (i.e. one record that contains several non-connected polygons) into a mutlipart shapefile? --EDIT For clarification the original question ...
3
votes
1answer
86 views

How to exactly copy one installation to another PC?

I've installed qgis on one workstation using OSGeo4w. I've launched the installer from a local folder and I have downloaded source files on a remote mapped drive. Frequently I relaunch OSGeo4w to ...
3
votes
0answers
364 views

How to set up a QGIS project in MVS 2008?

I have built QGIS using Visual Studio 2008. I would now like to start using the QGIS API for Windows Development. Of course I have Qt installed on Studio I hope correctly. I am new to Visual Studio ...
3
votes
1answer
331 views

How to open a Spatialite non-spatial view in QGIS

I'm using Qgis 1.8.0, and spatialite 2.3 in a Windows Vista machine. I have a database in Spatialite, and I have created a view from one of its tables. When I open it in QGIS, using add Spatialite ...
1
vote
1answer
316 views

How to draw lines for diagrams?

Just before submitting bug: in Diagrams, there is possibility to use Position AroundPoint or OverPoint. Whatever I choose Line Options selection stays gray: I can't choose any line. So, I suggest ...
1
vote
1answer
204 views

It is possible to add A* to the pgrouting plug-in?

I am using pgrouting layer plug-in as described in this post: http://underdark.wordpress.com/2011/12/18/osm2po-part-2-pgrouting-on-osm-the-easy-way/ I am now able to calculate the shortest path using ...