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

learn more… | top users | synonyms (1)

2
votes
1answer
70 views

Are there any document icons for the qgis mimetype?

In a default Ubuntu install (QGIS 1.8.0) no document icon is associated with the mimetype 'application/x-qgis-project'. As a consequence every saved QGIS document is interpreted by the OS as being a ...
4
votes
0answers
306 views

How to automatically format the legend labels? in QGIS

I have to do 10 maps (for a start) with "style" -> "graduate" with quantile mode. I need to format the label of the different ranges so that the legend looks comprehensible: Instead of having 1.0000 ...
19
votes
2answers
8k views

How to convert .shp into .gpx using QGIS?

I'm newbie using QGIS. I would like to convert .shp into .gpx. So, using Qgis, I open my shapefile and I tried to "save as" gpx but it gives an OGR error: creation of field ObjectId failed (OGR ...
1
vote
1answer
1k views

rpy2 installation ERROR “Tried to guess R's HOME but no R command in the PATH”? [closed]

I tried to install rpy2 (pip install rpy2). I want to use the SDAPP4 extension with QGIS (QGIS shows up the message missing rpy2...). The system tells me always the same error: Tried to guess R's HOME ...
5
votes
2answers
515 views

How can I make segmented roads appear as one line?

I am footling around with Quantum GIS and the British OS Strategi dataset. If I render the roads with a simple line style they look fine: However, if I apply something slightly fancier, it looks ...
5
votes
1answer
507 views

How do I allow users to select features with the mouse?

I am using PyQGis API to create a custom application. How do I allow users to select features with the mouse? Is there a mapTool for this? Surely with a product as powerful as QGis there must be. ...
7
votes
1answer
263 views

What constitutes a valid spatial layer when connecting QGIS to MySQL?

I'm trying to work with a MySQL 5.5 table using QGIS 1.8. I can do "Add Vector Layer", choose "Database", and successfully connect to the MySQL connection I previously set up. QGIS shows me a ...
1
vote
0answers
130 views

How can I access lost panels in print composer? [duplicate]

In QGIS, I no longer have access to the panels in the composition for printing window (layout, history, object properties). QGIS 1.8.0 on a Mac. What I already tried : The right click on the ...
5
votes
2answers
385 views

Extract certain area of contours/satellite images

I have 2 satellite images (jpeg2000 format) and 2 xyz-files from the same area. I am trying to extract certain region from the area including contour lines and the satellite image in order to import ...
1
vote
0answers
74 views

Problems with CRS in Qgis [duplicate]

Possible Duplicate: Raster incorrectly reprojected to OSGB(27700) The crs is clearly off when the gridlines run straight and the map lines run at an angle. I have set the crs to match the ...
18
votes
3answers
3k views

How to easily edit attribute data using Regular Expressions?

I am writing a tutorial for MSc students that uses QGIS. One of the tasks requires the attribute data to be modified (see pdf draft of tutorial here if interested ). The question is how to get them ...
2
votes
1answer
112 views

plugin 'hook' when writing with Python

Just a conceptual question... when writing a plugin using Plugin Builder 1.8.3, where does the script get connected to the application instance objects? As an example (taken from ...
1
vote
0answers
22 views

Qgis printing bug [duplicate]

Possible Duplicate: How to reopen hidden panels in print composer? I am new to QGIS and I have a problem with printing, After a bug, I do not have longer access to the functionality of ...
5
votes
2answers
387 views

Can you print cross-hatch area fills like they appear on screen?

I'm trying to use a cross-hatch symbol on polygons in QGIS. When displayed on screen, they look just fine - both in the map and in the composer. The problem is when they are rendered to an image ...
1
vote
1answer
358 views

Does “size scale field” in QGIS actually work?

I'm having mixed results with the 'size scale field' aka graduated symbols in QGIS. Some forum posts out there say this feature is broken - others can get it to work.
2
votes
1answer
63 views

What units are used in GRASS Rasterize?

What units are used in GDAL Proximity or GRASS Rasterize? - 'new size' parameter
1
vote
1answer
711 views

DLL load error with Gdal polygonize in QGIS 1.8 (windows 7) [duplicate]

Possible Duplicate: Qgis polygonize problem - DLL load fail [I had already posted this question, but was closed and redirected to a supposedly duplicate question. I'm re-posting since I ...
2
votes
0answers
137 views

How to make lines styles with offset join properly?

I want to draw the lanes of a two-lane street in different colors. I tried to apply an offset to a symbol layer which works fine for a single line but the ends of two connected lines do not join ...
4
votes
1answer
219 views

Exporting 3D geometry from PostGIS 2.0

I have a table containing 3D geometry in a PostGIS 2.0 database (the geometry is of type LINESTRING Z). I need to get the geometry out and into a DXF, DGN or 3D Shapefile. What is the easiest way to ...
5
votes
1answer
491 views

How to call GRASS modules in pyQGIS?

I wish to use a Grass module (v.to.db) in QGis, without the grass toolbox. I tried with the Python console, but to no avail : Using Sextante plugin but obviously it didn't know all the grass ...
1
vote
2answers
144 views

Is it possible to import SAGA colour styles in QGIS?

iam still using QGIS and SAGA independently in my productive use (despite the excellent SEXTANTE toolbox, which is sometimes a little buggy). SAGA has some very nice default styles and i am wondering ...
1
vote
1answer
135 views

Is there a straight way to copy or clone a QgsVectorLayer Object?

Is there a straight way to clone or "deepcopy" a QgsVectorLayer Object with python? Unfortunately the python module "copy" is not successfull with that. Thanks in advance! nikolaus
8
votes
3answers
928 views

calculate area of vegetations in a raster file

How do I calculate area of several vegetation types in a raster (.img file type) image. They are color coded. Am using QGIS (1.8.0) and ERDAS 9.2.
5
votes
1answer
345 views

How can I create a pollutant dispersion raster in QGIS?

As my previous questions have indicated, I am working on an air quality problem where I have a dataset of industrial emissions that consists of a location (long, lat), and an annual volume of ...
4
votes
1answer
638 views

Raster incorrectly reprojected to OSGB(27700)

Ubuntu 12.04, QGIS 1.8.0, GDAL/OGR 1.7.3, GEOS 3.2.2 Open a Spatialite db with OS Mastermap poly layer (EPSG:27700); Add OpenLayers Plugin (1.0) from QGIS offical repository; Add a Google Satellite ...
0
votes
0answers
431 views

Export dxf files for use in Sketchup

the export to dxf seems like it worked, but Sketchup will not import it. I don't think this is a Sketchup issue, as Sketchup imports other dxf files just fine.
2
votes
1answer
187 views

Problems with QGIS (v 1.8.0) layer labels [closed]

I have a PostGIS (v 2.0) layer representing lakes. The attributes "chinchar" and "chintrans" contain Chinese characters and Pinyin (Roman) characters in UTF8 format. When I use Layer -> Labeling in ...
2
votes
2answers
1k views

QGIS - extract raster values greater than 0

How can I extract values > 0 from an overall raster? I have a water level grid and a DTM from which I've derived flood depths (using the raster calculator) but obviously the final result contains ...
2
votes
2answers
600 views

QGIS 1.8 Did Not Install Properly— Will not recognize modules or DLLs— conflicting with existing PyQt?

I know this has been asked and re-asked, but I can't seem to get any of the proposed solutions to work. Upon clicking the start menu shortcuts to QGIS desktop, nothing happens. When I run from ...
2
votes
1answer
342 views

how to load a raster into the Map Canvas using QGIS Action

Is it possible to write an Action in QGIS that will load a raster into the current map canvas based on a url/path of the raster as specificed in the attribute table of a shape file? The shape-file is ...
3
votes
0answers
328 views

Problem connecting QGIS to MySQL [closed]

I'm trying to create a new vector layer and store it in a MySql-database, but when I test the connection I get an error with no detailed information at all. If I give an erroneus password I get a ...
2
votes
0answers
70 views

queried layer is not updating after drawing new feature in original shapefile

I have a project in qgis 1.8 where I added the same shapefile 3 times. On 2 of them I made a query. The third one is for edditing purposes. When I change the value of one of the features (in the ...
1
vote
1answer
2k views

How can I fix “ImportError: No module named qgis.core”?

First of all, I'm using Python 2.7.3, QGIS 1.8 (Lisboa) on Windows 7 pro 64 bits. Now let's go to the actual question: I have written some code (Python) that works well within the QGIS built in ...
2
votes
1answer
745 views

QGIS Attribute Table Not Displaying Data

Using QGIS and one minute I could see the attribute table, the next minute I couldn't. Using QGIS on Linux Mint 13. I tried purge/autoclean/reinstall to get a completely new download of all ...
3
votes
1answer
553 views

Where is the Road Graph panel?

I am trying to use the Road Graph plugin within QGIS 1.8 (running under Windows 7 64-bit). When I click Vector -> Road Graph -> Settings I get the settings-panel: But, I don't know how to enable the ...
1
vote
0answers
88 views

On the fly projection not working in QuantumGIS [closed]

I am trying to put a point layer of cities on top of a shapefile of counties in QuantumGIS. I have on the 'On the Fly' turned on and both files are in the same projection system. However, the point ...
1
vote
0answers
452 views

Why is my .csvt not recognized? [closed]

I am trying to associate a .csvt file with a .csv file, so QGIS doesn't insist on calling all the fields text strings (thereby preventing the use of graduated symbols). I used the syntax described by ...
16
votes
4answers
747 views

How to do kernel density estimation with a physical barrier/ boundary in QGIS?

Does anyone know of a programme that will allow kernelling that takes a boundary into account in its calculation rather than simply masking areas that are impossible? So far I have found: GME add on ...
2
votes
1answer
201 views

How can I select enclosed features within the same layer?

My problem: I have a single shapefile from a habitat-survey and need to select all hedge-features that are enclosed in meadows.The features that are to be selected were created by filling rings. ...
6
votes
0answers
148 views

KML (KMZ) to layer including all attributes [duplicate]

Possible Duplicate: How to convert KML to shapefile without losing attributes? This question is here in many variations but though I went through it I still don't have any good solution how ...
2
votes
1answer
356 views

How to fix problems opening JPEG2000 in QGIS Mac version 1.8?

I am running QGIS v. 1.8 on both my Windows and Mac partitions; Every time I try to open a jpeg2000 (jp2) raster on the mac version the program locks up and I need to force quit. Does anyone have any ...
1
vote
1answer
183 views

Why is transparancy of GRASS rasters missing when imported into QGIS?

I have a raster map in QGIS imported from a GRASS mapset with the QGIS GRASS plugin. The problem is that I have null() cells in the GRASS map that appear "colored" in QGIS. How can I set the ...
3
votes
3answers
220 views

Setup a map server that runs from USB to whatever computer it is connected?

I would like to have a USB that I can bring with me to any computer. That USB should hold a map server, so that the client computer wont need internet and avoid using OSM or Google maps or any other ...
1
vote
0answers
77 views

How to import ESRI geodatabase into QGis? (GIS beginner's question…) [duplicate]

Possible Duplicate: How to get “.GDB” (Esri File Geodatabase) support in Quantum GIS (osgeo4w - qgis) First, I would like to apologize as I know that this topic has already got a lot of ...
2
votes
1answer
573 views

How to meet “Contour plugin” and “Profile Tool” dependencies in OSX?

So I have two similar but different issues than my previous question, one I may have mentioned already. When attempting to install the Contour plugin I am told I need matplotlib, which I have on my ...
1
vote
1answer
186 views

QGIS Profile from Line tool requiring shapely.wkd?

I am trying to install the Profile from Line tool for QGIS, and the system informed me I need shapely.wkd. A search on the QGIS site for shapely takes me to the Contour Plugin...can anyone help me out ...
6
votes
2answers
3k views

Converting point sets to polygon boundaries

I'm trying to convert sets of points to their respective polygon boundaries. I think this is something like a Voronoi diagram or Convex Hull, but not quite. I'm sure there's a technical term for it, ...
2
votes
1answer
719 views

QGIS GDALtools plugin problem

I am trying to use the GDAL merge tool and receive the following error message: The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to ...
5
votes
3answers
288 views

What's the centerline of a peninsula?

Given a peninsula stretching north south and the two coast lines connecting in the south, I want to find out which is the place, or rather line, which is furthest away from both coastlines on the ...
2
votes
1answer
90 views

How large is the QGIS community?

How large is the QGIS community? Im interested in understanding the shift from traditional proprietary software to open sourced solutions. Thanks