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

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2
votes
1answer
2k views

How to create a line in a given distance to an existing one?

I am looking for a possibility to create a second line in a given distance to an existing line. The existing line is curved, so simply create parallel line segments with CAD tools will not work. Any ...
1
vote
1answer
147 views

QGIS 1.8 Desktop and Ubuntu 11.10

I'm working with QuantumGis 1.8 Desktop on Ubuntu 11.10. Two days ago the program crashed while I was working with some WMS layers and then it hasn't been working anymore. When I open QuantumGIS ...
2
votes
1answer
228 views

How can I apply correct colours to an elevation raster?

I have a problem to display elevation data with pseudocolours. The channel 1 is from -3.40282e+38 to 149.717 . A colleague used 1.7. and it looks like it should (from blue to Red) when I use QGis 1.8 ...
1
vote
1answer
267 views

Why are Postgis sequences not automatically updating in QGIS?

I'm adding new features to a polygon datasets in QGIS. The data is held in PostGIS but when i have a look at the attribute table for the polygon the gid field is not automatically updating, the entry ...
4
votes
1answer
2k views

QGIS: How to load feature (.qml) styles from python? [duplicate]

Possible Duplicate: How to style a layer from console? I'm trying to set the styles for a vector layer by loading the .qml file in the python console. The qml-style file contains all ...
15
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6answers
1k views

Which topics are essential for a crash course in QGIS?

What topics do you think are essential in a 25-hour "crash course" introduction for Quantum GIS? What topics do you think are nice extras to be included in such a course? Target audience: Zero or ...
0
votes
0answers
484 views

How to do a spatial join if QGIS 1.8 keeps crashing?

I am trying to perform a simple spatial join (adding polygon data to points) in QGIS 1.8: target vector: points join vector: polygons take attributes of first located feature keep all records ...
2
votes
4answers
1k views

QGIS locked into fullscreen mode on Ubuntu 12.04

No crash in this case, but I made the mistake of toggling to fullscreen mode on my netbook running Ubuntu 12.04. It's now impossible to escape this "No Menus" view, and it seems to have disabled the ...
6
votes
1answer
967 views

C++ Code Examples in Quantum GIS 1.8

I am trying to utilize the C++ code examples from blog.qgis.org, specifically Tutorial 4, Adding Rasters to QGIS Map Canvas. I am successfully able to run the example loading a GeoTIFF with QGIS ...
3
votes
1answer
537 views

How to make a minimal distance matrix for polygons using QGIS?

I have a set of polygons and I want to find minimal distances between the edge of each pair of them. It's similar task as in this question: How to find the minimum edge to edge distance of polygons? ...
2
votes
4answers
2k views

QGIS File Read Error when opening an existing project

My computer will not open a project i have been working on for weeks! it is coming up with an error of Project file read error: unexpected end of file at line 1 column 1 for file ...
1
vote
0answers
25 views

Why can I not start Quantum GIS? [duplicate]

Possible Duplicate: How to fix QGIS error “Entry Point could not be located”? Why can I not start Quantum GIS? What do I do about this following error message? "The procedure ...
2
votes
1answer
813 views

merge raster images: error message procedure not found

I am using QGIS 1.8.0. Whenever I try to merge raster images I get the following error message: Traceback (most recent call last): File "C:\PROGRA~1\Quantum GIS Lisboa\bin\gdal_merge.py", line 36, ...
6
votes
1answer
5k views

Is there a way to export data with coordinates from QGIS to a csv file

I have saved waypoints from my Garmin as gpx and have successfully imported them into QGIS. Is there a way to now export the layers into a csv file with coordinates? I've tried the export to csv but ...
2
votes
1answer
451 views

how to modify shape extents in qgis

I want to change the shape extent of some shape files, I would like to know how to do it in Qgis, since I rasterized some shapes and when I used the calculator to add them, the resulting raster had ...
0
votes
0answers
40 views

Modifying shape extents in qgis [duplicate]

Possible Duplicate: how to modify shape extents in qgis I want to change the shape extent of some files, I would like to know how to do it in Qgis, since I rasterized some shapes and when I ...
1
vote
2answers
241 views

Break between two raster layers (topographic maps)

I have the following problem [in QGIS]. In displaying two raster layers (topographic maps), a white area appears between the two. If I apply transparency to one of the layers, this white area still ...
4
votes
1answer
215 views

Dropdown menu to select vector layer from current displayed layers in qgis

I'm trying to write a python plugin to create an input file for an urban climate model out of three shape files. One of the shape files contains the buildings (polygon), one the trees (point), and the ...
14
votes
3answers
1k views

Is there an automatic function in QGIS to package all files in a project for transferability?

In my project, I use a lot of geodata from different directories. Now I want to give the QGIS project to a colleague (eg on a CD). Is it possible to copy the shapes from different directories ...
1
vote
1answer
1k views

Why can't I install python-qgis on Ubuntu 12?

I am with ubuntu 12 and Qgis 1.8. I have installed QGIS and grass plugin but I can't install python plugin. How to install python plugin with dependeny in Ubuntu? ~$ sudo apt-get install python-qgis ...
2
votes
0answers
83 views

How to call a method when self.iface.actionSelectRectangle().trigger() is released?

In my QGIS python plugin I use "self.iface.actionSelectRectangle().trigger()" to select features. I also have a button which changes the attributes of the selected features. Is there a way instead ...
0
votes
1answer
798 views

Print Composer Problems with Export as PDF [duplicate]

Possible Duplicate: QGIS Crashes when writing to PDF My QGIS crashes during the export of maps to pdf. I already uninstalled and installed QGIS twice. The function worked for several times ...
3
votes
1answer
279 views

What is status of OpenSceneGraph (OSG) plugin for QGIS? [closed]

Does anyone know if the OSG plugin for QGIS is working? If so does anyone knows what the future plans is for OSG plugin in QGIS? I am using QGIS version 1.8.0-Lisboa. I keep getting the following ...
3
votes
0answers
257 views

How to access tiles in Tilecache using QGIS?

I've Mapserver set up with a mapfile that points to a tileindex. In QGIS I can call the mapfile and view the rasters dynamically. I've got access to tilecache and I've seeded the same mapfile/rasters ...
2
votes
0answers
197 views

qgis and embedded ajax (bing map)

I need to load in a docked QWebView this html: < html > < body > < iframe width="100%" height="499" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" ...
4
votes
1answer
1k views

Qgis - How to change GDAL version

im working on Ubuntu 12.04 server; i noticed this when i installed additional support for ECW format into the GDAL 1.9.1 which worked ok. Then i tried to add ECW files to Qgis but it said they still ...
2
votes
1answer
301 views

Is it possible to set a layer style (e.g. set the color ramp) before loading the layer using pyQGIS?

I am implementing a tool which allows an user to calculate some statistics with some data from the registration office. My question is, can I set some layer styles using pyQGIS? The analysis part is ...
2
votes
1answer
1k views

encoding problem with QGIS 1.8 and CSV import

I have following problem with QGIS 1.8. Lisboa (standalone installer, Win 7 Pro 64bit) - I import CSV - text in CP1250 separated with ";" and using "," as decimal separator. I correctly set the ...
1
vote
0answers
152 views

How to export dxf of window view from postGis MasterMap layer

I have managed to get qgis to show my Mastermap data which is stored in a postGis database. It's national coverage so seems to take ages to load but that's another question. I basically want to ...
5
votes
2answers
2k views

How to compare two DEMs and show their difference?

I want to compare my DEMs (ASTER GDEM2 and SRTM4.1). I know, that the GDEM has some extreme "holes" with totaly wrong elevations (I found 3 of them in my working area). Now I need to know, if there ...
3
votes
3answers
3k views

How to delete duplicate lines?

I was wondering if anyone could help. I have a tab file in MapInfo consisting of just polylines. Each is meant to have its own reference number, however some are duplicated (e.g two lines occupying ...
5
votes
1answer
4k views

How to configure QGIS Sextante to use SAGA?

I have been trying to set up SAGA to work using Sextante in QGIS. I have followed the instructions to configure SAGA in Sextante, with the following input in the path for the SAGA folder C:\Program ...
10
votes
7answers
8k 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
229 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
269 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
601 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
1k 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
409 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
387 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
883 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: ...
5
votes
1answer
3k 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
484 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
4answers
2k 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
2k 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
772 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
101 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
2k 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 ...
6
votes
3answers
10k 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
2k 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
1k 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 ...