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

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504 views

How are .mif files loaded to QGIS?

I have downloaded sources of Qgis 1.8. I would like to know how it accepts mif file. As I have learnt after choosing add VectorLayer. Method addVectorLayers is called. Then openvectorlayer dialog ...
9
votes
2answers
289 views

Options for a historic Web Map?

EDIT: I'm an intern at a small local history museum. We have a budget of $0. Project overview: I've got a bunch of old paper maps. When I say old, I mean 1800s and up. They've been scanned into ...
2
votes
1answer
648 views

Extract all the intersections from a polyline shapefile

I would like to extract all the intersections from a polyline shapefile and print their addresses as text using either ArcDesktop or Quantum GIS, is there a straightforward way to do this? My ...
3
votes
1answer
270 views

Why does QGIS Polygonize ignore the no data value?

I'm running into an issue georeferencing a number of PNG image files. The files simply contain an image where each pixel is either transparent or a single color, forming a coverage mask. In the past, ...
4
votes
1answer
738 views

merge selected features and programming

I have a shape file with UK districts and unitary authorities. In the past, using commuting patterns, I worked out a new geography which is close to travel to work areas. I now would like to create a ...
4
votes
1answer
239 views

QGIS Globe UnsupportedOperationException

My QGIS Globe is not working: After starting it, that massage pops up in a endless loop: UnsupportedOperationException: GeometryGraph::add(Geometry &): unknown geometry type: ...
2
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1answer
499 views

How to design a road with a certain slope

Is there a way that you want to connect two different points of altitude with a constant slope of 7% or another, to draw a line in the 3D model?
10
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1answer
485 views

How to convert fake donut holes in polygons to real ones?

I have this problem where I have to import shapefiles into our system which must be geometrically valid, but the software that everyone uses to produce them seems to output files where every polygon ...
2
votes
2answers
133 views

Are there no italic fonts in Print Composer?

QGIS 1.7 doesn't seem to have an 'italic' choice when annotating a map in Print Composer, only 'regular' or 'bold' fonts, a rather surprising omission if correct. Is there some other way to create an ...
4
votes
3answers
998 views

Convert an arbitrary meta-data-free map image into QGIS project

My background: experienced programmer, amateur historian, complete beginner to GIS (so I'm using QGIS). I did learn to use the QGIS georeferencer tool though. The input: suppose I have an image like ...
2
votes
3answers
2k views

QGIS Web Client in Windows does not load map

I have installed QGIS (1.8 Lisboa) desktop and server on a Windows XP machine. I am now trying to configure the QGIS Webclient. I downloaded the zip file from GitHUb, and made the changes to the ...
0
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1answer
384 views

Python 3 support in qgis

as python3 is getting standard more and more I wonder wether there is or will be support for python 3 in qgis. Thanks
3
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4answers
2k views

Add UTM labels to grid in qgis

I try to use qgis to create a custom topographic map for outdoor use: UTM, 1:50000. What these maps usually have is a 1km x 1km grid, which at the bottom is labeled with a shorthand for the ...
2
votes
1answer
279 views

Geo Tiffs overlap in QGIS

I am trying to stitch together several GEO Tiffs that come in pairs (north -south) but when i load them into QGIS they display completely overlapped. That is the north south pair match up ok (display ...
6
votes
1answer
466 views

Where are the Expression-based Labeling options in QGIS?

I have imported a layer into my map to show the location of towns/cities. However I had to set graduated styling so that only cities over a certain population show. I now want to label the ones that ...
5
votes
1answer
2k views

Is there a way to export QGIS layers to KML?

has had anyone had any luck with the new experimental plugin qgis2kml? I keep getting the error msg layer : format not yet supported I had a look but the author has not provided any documentation, ...
2
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2answers
360 views

QGIS – Batch maps (atlas plugin style) in same location

I've got more than 200 shapefiles of points representing different information for the same location. I would like to make as many maps as shapefiles with identical background and extent. I'd rather ...
2
votes
2answers
390 views

Selecting Part of a Polygon

I have a dataset, in shapefile format, for agricultural land grades in England. It is divided into 7 categories in its attribute table. As the file is a large file and I only want a small section I ...
3
votes
1answer
1k views

Why can't I download the georeferencing plugin for QGIS 1.7.4?

I used the georeferencing plugin with QGIS 1.6 and now that I've upgraded to 1.7.4 I'd like to do it again. But when I search for the georeferencer plugin, it's not available! Am I doing something ...
3
votes
2answers
264 views

How do I specify the position, style and units of the ScaleBar in pyqgis?

I would like to add a scale bar to my composition using the python console and then export it to a raster image. I am following the MapRendering tutorial with the "output using map composer " approach ...
3
votes
2answers
344 views

Google/OSM style map layer labels

I am currently using the OpenLayers plugin to import google maps as the base layer for a heat map. The map is of population by census tract. The more populous census tracts are red and less populous ...
10
votes
2answers
2k views

Running QGis from flash drive

How can I setup a portable QGis to run from a flash drive / USB-Stick? In the userguide for QGis 1.7 Wroclaw there is only mentioned the option of "--configpath". But to me it is not clear how to deal ...
3
votes
3answers
1k views

Missing tools (icons) QGIS

I lost selection and navigation tools from the GGIS 1.8 toolbar when I tried drag then to different place. I can't get them back anymore. Where they disappear? All these tools are checked but are ...
2
votes
1answer
397 views

How to load a postgres view using pyQgis?

Under Qgis 1.8 on Windows 7 I have this problem with my pyArchInit plugin: I need to load on the map canvas my geometries from a postgis layer. Till the 1.7.4 version I use the method explained on the ...
7
votes
1answer
1k views

Unable to Install External QGIS Plugins

I'm using: QGIS version 1.8.0-Lisboa on Windows XP, installed using OSGeo4W I am behind a proxy but I have configured it in Options > Network. When I go to Plugins > Fetch Python Plugins.. All of ...
0
votes
3answers
5k views

How to publish my map on the web? [closed]

I want to publish my map is created in QGIS 1.7.4 version on to the web.Can u pls suggest me how to publish the map with proper documentaion and screen shots if possible?
3
votes
1answer
241 views

how can I obtain the areas where my rasters overlap, using Qgis?

I have a bunch of raster files showing the distribution of different species of mammals, and I would like to obtain the areas where they overlap, the areas in whitch more than one species can be found ...
2
votes
0answers
174 views

Polygonize problem [duplicate]

Possible Duplicate: Polygonize function doesn’t overlay the shape file over the raster file When using "Polygonize" in Quantum GIS, I'm getting a polygon shapefile output that is a mirror ...
8
votes
4answers
1k views

How to run sextante algorithms outside of qgis python console?

I'm kind of stuck trying to figure out the way to run sextante from a standalone python from OSGeo4W distribution. The reason I want to do this is that I got tired entering parameters in the dialog ...
1
vote
2answers
333 views

Need help getting started with QgsComposition

I am using QgsComposition for the first time, but I fail at the first step :-( mapRenderer = iface.mapCanvas().mapRenderer() line 31, in mapRenderer = iface.mapCanvas().mapRenderer() ...
2
votes
1answer
356 views

How to add EPSG:5235 to QGIS?

First of all I should say I am new to EPSG and QGIS world.Then I want to Georeferced Raster image to EPSG:5235 in QGIS. But in Qgis I can't found above EPSG. How I add this EPSG to Qgis ? Pls help ...
1
vote
1answer
223 views

QGIS Projections

I am new to the GIS world and have faired pretty well with ArcGIS 9.3, learned and still learning on the job. I would like to get a better handle on QGIS though. I linked the files from my dropbox. I ...
5
votes
1answer
617 views

Qgis polygonize problem - DLL load fail

I have a raster file and I want to perform the method "polygonize". Then the problem occurs, that is shown on the screenshot. It doesn t have anything to do with the rasterfile format, I veryfied. ...
2
votes
2answers
3k views

How to add a google/OSM/bing etc style map layer to Quantum GIS

I am just getting started using QGIS. I am aiming to create a heat map of Census tracts in Georgia based on population. I have all of the data - the population for each census tract in Georgia. I've ...
7
votes
2answers
658 views

How to get latitude /longitude in Degree Minute Second (DMS) using QGIS field calculator?

I have come up with the following expression to convert 5.1234 to 5° 7`24.24" toint ($x) || '° ' || toint((($x) - toint ($x)) * 60) ||'`' || substr( (tostring(((($x) - toint ($x)) * 60) - ...
3
votes
2answers
556 views

How to create a polygon based on view extent in QGIS 1.8 ?

I am looking for a very simple thing. I want to create a polygon based on the current view extent of my project. In fact I want to 1) open google satellite layers 2) zoom to my area of interest ...
2
votes
3answers
455 views

Communication Between Browser and QGIS Server/QGIS API

Suppose I have QGIS server up and running with some vector data. Now a user accesses this data from a webpage. Would it be possible in some ways for the user to send a request to the QGIS Server and ...
3
votes
2answers
574 views

Normalize raster values to 0-255

I need to normalize the values attained from a band ratio to 0-255. I'm using QGIS. How do I do this? Any ideas?
4
votes
1answer
1k views

Performing Geoprocessing SQL Queries in QGIS from a PostGIS Database

This may be a dumb question, but is there way to run a PostGIS geoprocessing SQL query in QGIS? Specifically, I am thinking of running SQLs such as ST_Union, ST_Split etc etc. I have tried the ...
0
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1answer
252 views

How to convert the python plugins into dll file for QGIS application?

How to convert the python plugins into dll files for QGis application? Thanks in advance.
1
vote
1answer
389 views

Where is Table Manager in QGIS 1.7.x?

I would like to ask you, if is available funcionality like "Table Manager" for QGIS 1.7.x? I need to move fields in attribute table and then save changes. I don't see "Table Manager" or something ...
2
votes
0answers
180 views

How can I apply “natural breaks” classification to a raster symbology in QGIS?

Anyone knows how can I apply "natural breaks" to a raster symbology in QGIS? Cause I only see the "Equal interval" option.. I'm using QGIS 1.9
1
vote
2answers
121 views

Fetching field values from uncommitted features on Qgis

I'm trying to fetch a feature's field value on Qgis, I use QgsFeature.attributeMap().value(cont int & key).toDouble() This works fine for committed features but it always returns " 0 " if the ...
2
votes
1answer
353 views

QGIS apply style to shapefile

I'd like to create a Categorized style in QGIS, classify with it data in a shapefile and then save the shapefile with the new categorized style. Is it possible?
2
votes
0answers
171 views

QGIS: WMS misalignment

I am experiencing a small screen space offset when using a WMS layer (origin is GeoServer 2.1.4): The image shows a red square which is the top left pixel of a tile (GeoTIFF). An exact copy of the ...
1
vote
0answers
257 views

QGIS & WMS: Different aspect ratio between width/height and bbox

I am experiencing a small screen space offset when using a WMS layer (origin is GeoServer 2.1.4). Looking at the requests from QGIS (1.7.4) to my GeoServer I realised that the aspect ratio between the ...
1
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0answers
752 views

Which Open Source GIS Software is preferable either QGIS, mapWindow or gvSIG?

Which open source GIS software is preferable: QGIS, mapWindow or gvSIG. On the basis of: GIS analysis. Digitization. Quality checking.(Data correction). Store of data(i.e. storage in db as well as ...
1
vote
3answers
349 views

Automatically assign numbers to point file in various order in QGIS

I know how to automatically assign numbers to a new point files using the $rownum function in the field calculator. However it does it from the top-left over and down like reading a book. I could ...
0
votes
1answer
183 views

Will there be QGIS for Playbook?

Does anyone know if a mobile version of QGIS is planned for the Blackberry Playbook. I know there is an android version, I tried converting it to .bar and gave up when it wouldn't load because it ...
2
votes
2answers
349 views

QGIS Newbie Rendering Time

I am new to QGIS and have just installed 1.8.0 on a Gateway laptop that is about 2 years old. It is running Windows 7, has an Intel Core i3 2.13 GHz processor, 4 GB of RAM. I've just brought in my ...