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

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3
votes
2answers
159 views

How to create a hectare raster from vector input data in QGIS

I have a vector file containing points with an attributed value (no. of employes at that location). I need to create a hectare raster with the sum of employes for each grid cell. I'm using QGIS and ...
0
votes
2answers
557 views

How to install Shapely, but got stuck into Python language

I have a MAC OSX 10.7.5 and am trying to learn how to use QGIS. Following a couple of tutorials I came to know I have to install shapely. I followed the instructions by the multi-cited ...
2
votes
1answer
598 views

How to open *.aux file in QGIS?

My university desires to switch from using ArcGIS to using QGIS and therefore I have to figure out whether the exercises that are used in lectures can be performed using QGIS. I have an .AUX file ...
1
vote
3answers
210 views

How to calculate line centroids for 460,000 features?

I have a large shapefile of lines, and want to run a mmqgis function (Plugins --> mmqgis --> Modify --> Convert Geometry Type.) The problem is the file is very large and crashes the program. What ...
1
vote
0answers
70 views

Problem with nviz and QGIS 1.8

I am using QGIS 1.8.0 on Windows 7. In nviz (via SEXTANTE), after selecting an altitude layer and the GRASS region extent, I hit OK; the progress bar quickly reaches 100% and then absolutely nothing ...
1
vote
1answer
68 views

How to move a value from field1 to field2 using Field Calculator?

Hi I would like to move value in field1 to field2. Purpose is to after that delete the column 'field1' to get a better column naming standard /Jan
1
vote
1answer
274 views

Import garmin Topo map to QGIS

I would like to import my Garmin Topo Maps to QGIS. I want to use the Topo Map as a Layer to create Shapefiles. Can anybody tell me if it is possible to import the Garmin maps including waypoints as ...
2
votes
1answer
426 views

Label callouts in QGIS

Has anyone been using callout labelling with QGIS, either trunk or stable? Used for clustered points. That means the point stays where it is, the label maybe moved if required and a leader (plain or ...
1
vote
1answer
138 views

QGIS 1.8 tries to use UTM in spite of geo projection file

I'm wrestling with a problem that I am sure I've created for myself, but cannot resolve. I received a set of shapefiles that were expressed with UTM, and I want them to use lat/lon. QGIS will do the ...
1
vote
0answers
75 views

Unable to Add Features to PostGIS Layer in Quantum GIS 2

I am testing out Quantum GIS 1.9-master and I've noticed that I am only able to add features to a PostGIS 2.0 layer if that layer is in a schema with the same name as my login. For example, if my ...
2
votes
1answer
58 views

using “abs()” function in QGIS field calculator?

I'm pretty new to GIS in general and I'm trying to take an absolute value of the difference between two fields in field calculator when creating a new field, but using ABS () returns an invalid ...
1
vote
0answers
151 views

problem overlaying osm with os-derived data in QGIS - both British National Grid

I am currently working alongside city council datasets derived from Ordnance Survey; this is projected in their ArcSDE system as "British National Grid" or EPSG:27700. My problem is that I am trying ...
1
vote
3answers
579 views

How to setup a debugger for QGIS Plugin development?

As the title of the question implies, I wish to know how to set up a QGIS Python Plugin Debugger so that I can develop plugins more efficiently. Any information regarding this would be much ...
5
votes
2answers
441 views

Changing Data Source of Layer in QGIS

Is there a way to source a shapefile to a layer file in QGIS much like how you do this in the properties of an ArcGIS layer? (i.e. Go to layer properties, source tab and then just depress the 'Set Dat ...
1
vote
1answer
500 views

Import SketchUp created KML contour lines model to QGIS

There's a neat trick to create contour lines based on the GE 3D terrain using Sketch-Up. The resulting KML however is a model I have looked at ways of importing KML layers to QGIS, like it was ...
1
vote
1answer
69 views

Error output with gdalwarp

Following is my raster file and mask shape file files I use qgis 1.8.0 to clip the raster with shape file by gdal tools but after I run warp in gdal tools it's just give me no data in the output ...
0
votes
0answers
31 views

Qgis dynamic web maps [duplicate]

I am new (Mac lion 1.8.3) Qgis 1.8 user . It was very easy till now to make a map. But now I am facing the next step that is out of my knowledge. I want to publish dynamically the map to my web page. ...
0
votes
1answer
151 views

QGIS plugin WORKS under Windows but NOT under Linux. How to get fîle path properly under Linux?

I am currently working on a QGIS plugin which depits node to node discreet flows. Let' say adaption of Tobler's Flow Mapper to QGIS. Plugin currently tested and working under Windows. But not under ...
0
votes
0answers
56 views

How to simplify vector lines into an overlaid grid in QGIS?

I'm a relatively new user with GIS software (primarily QGIS) and I'm sure this is probably quite simple but I've been trying to find an answer for ages! I have transportation network data for an area ...
1
vote
2answers
615 views

Can I use QGIS with Qt5?

I want to use QGIS with Qt 5.But i don't know the exact relationship between Qt and QGIS.Will there some problems if i use qgis with qt5 or it will not depand on it...
1
vote
1answer
69 views

Qgis 1.9 issues with python [closed]

I already installed the version 1.9 of Qgis and when i runned e Script python on i could this error 'NoneType' object has no attribute 'children' however it works fine on qgis 1.8 could someone ...
0
votes
2answers
649 views

Is QGIS suitable to create maps with image popups?

I am a new user of QGIS and was wondering if I came across the right software to achieve my goal. Long story short, I am trying to create a map with markups of various buildings. Once I click on a ...
2
votes
1answer
190 views

How to configure Geoserver WMS to make it printable from QGIS/ArcGIS?

I have installed geoserver 2.3.1 - I am using this to create a WMS of some data held in PostGIS. I can view the WMS in QGIS and ArcGIS, but it won't print from ArcGIS (blank sheet) and in QGIS I get ...
0
votes
1answer
116 views

Run fichier.sql in QGIS python console

i use QGIS and i want to know how to run a sql code (fichier.sql) in python console in QGIS I have used this : impost os os.system("psql \i C:/fichier.sql -d test2 ") but it doesn't work Any ...
8
votes
2answers
1k views

How best to share QGIS data with an ArcGIS user?

I mainly use QGIS and have a large project to complete. Once I am done I'll need submit my data to an ArcGIS user. The data will consist of mostly point and polygon shape files. Is there a best ...
1
vote
1answer
1k views

Overlay lat/long graticules on projected map QGIS

I am using an equal areas projection of North America and would like to overlay a lat/long grid. I can do this in the print composer, but only for the coordinates. Can QGIS do a distorted grid for ...
3
votes
1answer
830 views

Unable to install QGIS 1.8 on Ubuntu [duplicate]

Can someone please walk me through installing qgis on Ubuntu 13.04. I keep getting 1.7 no matter what I do and I would like 1.8 if possible. I am a new Linux user. This was addressed in a previous ...
1
vote
1answer
418 views

unable to install qgis 1.9 on Lubuntu 13.04 [closed]

I tried to install qgis 1.9 in my laptop. I use Lubuntu 13.04 (64bit). I used the repository deb http://qgis.org/debian-nightly raring main deb-src http://qgis.org/debian-nightly raring main ...
1
vote
1answer
188 views

Why does the Clipper tool lack the mask layer option?

Fairly new at QGIS, but everything's gone well so far. I'm running QGIS version 1.8 on a Mac (OSX 10.8) and GDAL 1.10, and other GDAL tools (like Merge and Georeferencer) work just fine. When I ...
2
votes
2answers
95 views

How to overcome the layer limit on OSX?

I am trying to add many layers to a project in QGIS. After adding approximately 80 layers, QGIS returns this error: "not a valid or recognized data source". There is nothing wrong with the shapefiles ...
0
votes
0answers
70 views

How to transfer absolute node position to latitude and longitude? [duplicate]

I am new to gis and also a newbie using QGIS. I have got a Layer with one shape. I extracted the nodes from the shape. Now I have got the absolute X and Y value of my Layer in the attribute table. ...
1
vote
1answer
67 views

For each polygon, return yes/no value if it intersects another layer

I have a polygon grid overlaying several other polygon vectors. I wish to visit each polygon in the grid and ask yes/no if each of these layers fall within the grid cell or not. I can do this easily ...
2
votes
1answer
151 views

How to get a correct scalebar in QGIS?

I apparently have a problem with getting meaningful scalebar values referred to a shapefile in QGIS. I think I tried all solutions suggested in other discussions, but still I don't get it. I use QGIS ...
6
votes
1answer
113 views

Database Diagrammer for PostGIS [duplicate]

Is there a application, or QGIS plugin to generate database diagrams (specifically for PostGIS) similar to the ESRI Diagrammer? Thanks...
3
votes
1answer
267 views

Why is Spatialite showing dates in MM-DD-YYYY format?

I have a table with a dates column that is formatted in MM-DD-YYYY format, as shown in SQL SELECT statements. I'm using Qspatilite (QGIS 1.8) and Spatialite GUI. When I ORDER BY the date column it ...
1
vote
1answer
610 views

How to use GDAL-commands in QGIS?

I recently used a GDAL-command working with the OSGeo4W command line, but it does not feel that comfortable. Is there a way to somehow execute a GDAL-command directly in QGIS? Right now the ...
1
vote
1answer
39 views

How to cycle thru items in print composer?

In print composer I have many items placed on the "paper". These items include borders, one map, bar scale, logo and an arrow. When the items overlap each other I am only able to select the item on ...
1
vote
1answer
85 views

Help with trying to track ice and polar bears on a map. No idea where to begin

I was asked create a little google map showing the location of Polar bears. I've been given the location data in lat-long format. For each bear I've been given a file containing the following ...
2
votes
0answers
118 views

QGIS - Android, loading a .tif file

I have a .tif file I would like to use as my base map on the Android version of QGIS. However, when I try and load it as a raster layer, it states that this is not a correct raster source. Is there a ...
0
votes
1answer
94 views

Strange problems with project crashes and bad:alloc in QGIS 1.8 linux

during last days I had to prepare some maps from field data. I mainly worked with point shapefiles and openlayers map background. After some time I always noticed some problem like just partial ...
1
vote
0answers
181 views

Oracle Spatial support QGIS 1.9-0-Master (Ubuntu)

I just installed QGIS 1.9.0-Master (Build 480) on a Ubuntu virtual machine. I am running/compiled against GDAL/OGR 1.9.2. My question is why I cannot add Oracle Spatial Layers as I am able to do ...
1
vote
2answers
100 views

How to clear attribute columns from a Shapefile?

I want to clear all columns from a SHP. Only need geometry of features. I use QGIS and Sextante with grass and saga. Is there any tool for this job...
0
votes
1answer
297 views

Which CRS fits “Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20”?

I am trying to georeference a VFR chart in qgis and I can't figure out which CRS to use. Map projection - Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20. Any ideas which ...
2
votes
3answers
594 views

How to add QGIS Python API Intellisense support in Aptana Studio3/Pydev

I'm developing QGIS plugins using PyDev in Aptana Studio 3 and I would like to know if it's possible to make it aware of the QGIS API and add some "intellisense" functionnalities when programming. For ...
0
votes
2answers
338 views

georeference IMG file in qgis

I have a problem: I'm trying to georeference a satellite image (ASTER, Erdas Imagine file *.img) in QGis. I have georeferenced with QGis before and never had any problems. The file is georeferenced ...
0
votes
1answer
69 views

No legend in QGis Web Client

I have a QGIS Web Client working, but it lacks a legend and metadata panel as is shown here What do I need to have the referred legend panel?
1
vote
0answers
35 views

can the Identify Features button in QGIS list data in natural order

Is there anyway to get the Identify Features button in QGIS to list my attribute data in their natural order, NOT in alphabetical order?
2
votes
1answer
230 views

Solution for slow display of postgis-tables ? (qgis 1.8 + postgis 2.x)

I have the problem that my postgres-tables are displayed very slow when I scroll them in QGIS. I have no problem with other tested GIS (e.g. UDig, GVSig, ArcGIS). The number of objects isn't large ...
0
votes
0answers
172 views

SEXTANTE runalg and QgsVectorLayer issue

I'm trying to make a script for converting polygons to lines. But I'm having some issues while generating temporary layers. In this script, I iterate through all the features of the input layer to ...
4
votes
3answers
567 views

How to find the polygon inside which a point lies?

I have a layer with polygonal features. Each feature has attributes and values. I also have a list of co-ordinates and I would like to know which feature (or polygon) the co-ordinates lie in. Could ...