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

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7
votes
4answers
3k views

How to install “1-band color raster color table”?

I would like to use the "1-band raster colour table" extension. I'm using QGIS Wroclaw 1.7.4. In the plugin installer I can't find this extension, even I quote for third party extensions thing. Does ...
9
votes
3answers
3k views

Divide a complex shape file into a grid

I have a decently detailed shapefile with polygon/multipolygon features (the file is about 500mb). It's actually a shapefile of the entire world, with the features representing coastlines. I need to ...
1
vote
0answers
217 views

Installation problem with XY Tools [duplicate]

Possible Duplicate: How to install Pyton libs for XYtools to read Excel files I was using XY Tools plug-in for QGIS that converts Excel files into attribute table and shape files etc, but ...
1
vote
1answer
684 views

Cant install QGIS 1.7.4/1.8 after system update

after a routine system update my qgis got lost (xubuntu 12.04). After trying to reinstall 1.7.4 this massage apears in Softwarecenter (german): Die folgenden Pakete haben nicht erfüllte ...
6
votes
2answers
2k views

QGIS calculate distance of point along a line

I have a polyline (movement path) and points recorded along the line. I would like to calculate for each point the distance along the line in Quantum GIS. I hope for a result which will add a new ...
2
votes
3answers
408 views

QGIS: how to set data defined text angle without setting x and y coordinate using new style labelling

I have a problem setting angled text labels with the new-style labelling dialog. The situation is this: I have a shape file which only contains only labelling texts. This is a point layer, and it ...
1
vote
1answer
568 views

Working out percentage in QGIS field calculator

I have a project in QGIS where one of the things I need to do is work from a police data file with 9 months of crime information, linked to details of county population (age, employment, etc) to ...
2
votes
1answer
183 views

QGIS Cross Tab of Towns and Routes

Using QGIS, I have a layer with 100 towns. I have another layer with 200 cycle routes, each with a different name. I want to create (automatically natch) a table that will help the people in each ...
2
votes
1answer
416 views

How to display only one pie chart for polygon features in QGIS?

I'm working with Qgis on a project and I have a small problem. I have to do some demographic research and therefore I have a .shp file from a given country with 10 districts for example. Now, I know ...
1
vote
2answers
322 views

Select points within a relative number range

I need to select points that have attributes that are within a relative number range of each other. For instance; given the following numbers: 95,705,139,65,537,266,525 and 188; I need to find all of ...
4
votes
2answers
565 views

How to show two different labels of a particular vector layer with the help of QGIS?

I am working under a government project in Kolkata with QGIS. I want to show two different labels of a particular vector layer. just like we can show two different labels in Arc GIS with the help of ...
1
vote
1answer
214 views

hypsometric colors alà IMHOF, SYDOW or PEUCKNER

I need a hypsometric color-map to add it to my multishade-modell. (High Mountain between 800 and 4000m) There are a lot of differend typs explained in IMHOFS "Cartographic Relief Presentation". I want ...
5
votes
2answers
2k views

Layer misalignment with UK Ordnance Survey data and OpenLayers

I am in the UK and my QGIS projects are based on UK Ordnance Survey mapping data and are set up in EPSG:27700. Whenever I have tried dropping an OpenLayers layer (Google Satellite/Bing Maps Aerial) in ...
5
votes
1answer
383 views

How to open two projects at once in one QGIS window?

is it possible to have open two gis projects at once within QGIS? I want to compare the position of points between two different coordinate refercence systems. nice regards, jörn
5
votes
1answer
1k views

How can i delete multiple nodes, for a polygon, with Quantum GIS?

I know how to select a single node and delete it. I can also click-drag to select MULTIPLE nodes. But if i click delete, only one node (from the higlighted list) is removed. Can I delete all the ...
1
vote
1answer
271 views

Looking for QGIS Presentation info

I'm preparing a presentation of QGIS to release of the brazilian QGIS user guide. Thus, I would like insert some information about QGIS in global scale. Something like Tim's qgis-for-humanity ...
5
votes
2answers
270 views

Raster calculation confusion

I need to do some raster calculation, I've been trying to make it work but I am not sure everything is working properly. I need to apply a formula, but I am unsure if I am doing it properly. The ...
2
votes
1answer
854 views

Is it possible to integrate a route planner into QGIS?

I am looking for an open source GIS and now asking myself if it is possible to integrate a route planner into QGIS. The route planner should be able to calculate the distance from one position in the ...
14
votes
1answer
498 views

Hand drawn sketchy symbology styles for GIS software

Often times in planning projects, a hand drawn, sketchy look is desirable in order to convey the preliminary nature of a project. Is anyone aware of any utilities/plugins for desktop GIS software ...
1
vote
2answers
356 views

How to shift the Map a little bit?

I'm having trouble with two maps, both UTM33N/WGS84. They should be exactly on top of each other but there is a slight shift between them of probably a few hundred meters or so. I Tried to adjust ...
1
vote
4answers
2k views

Where to find qgsaffine in the menu?

I installed the plugin qgsaffine but cannot find the entry in the menu bar. Where do I find this. Can anyone here help me with this? best regards desputin
7
votes
3answers
5k views

How to access QGIS Plugin Repositories from behind a proxy?

I have been trying to teach myself QGIS by using this forum and others to help. Most of my questions can be answered by downloading plugins that are available through 3rd party repositories but for ...
3
votes
1answer
172 views

How to unload() a plugin in QGIS 1.7?

I am writing a python plugin for QGIS 1.7 (started it on QGIS 1.6 but switched to 1.7 recently). Since I switched to 1.7 my unload function doesn't seem to be working anymore. Whenever I implemented ...
4
votes
2answers
4k views

Which hardware configuration is necessary for QGIS?

What kind of hardware is necessary to run QGIS on Win XP? Closely related: Specifications for GIS desktop hardware
4
votes
1answer
315 views

Multishading: bring them together to one Raster-Image

I made a multi-hillshade with 4 different light-directions and colors and stacked one above the other, each with its own transparency. Now I want to "save" the result in one raster-image. Whats the ...
2
votes
2answers
287 views

QSpatialite install error in QGIS

I'm installing QGIS 1.7.4 in windows 7 & having problems with QSpatialite. I get 3 messages... Message #1 This DB a valid SQlite DB, but not a valid SpatiaLite DB. QSpatiaLite will now try to ...
2
votes
1answer
393 views

QGIS Time Manager Data entry

I have downloaded the Time Manager plugin for QGIS. I have created a simple test file with only 4 points, with a date attribute showing YYYY-MM-DD, each point moving forward one day. Yet it tells me ...
2
votes
0answers
122 views

Changing CRS crashes QGIS every time

When I open QGIS, and use the tools, setting -> project properties, QGIS will crash. When I also use the setting -> option -> CRS , Select new CRS also causes a crash. It looks like couldn't use the ...
18
votes
3answers
29k views

How to merge multiple layers to one layer using QGIS?

I've imported several shapefiles which where exported from an Mapinfo .tab. Several tab files are imported resulting in 20+ layers. Afterwards I want to export it to geoJSON; but I'm reluctant for ...
8
votes
2answers
738 views

Can QGIS Read Spatialite Views?

I have a spatialite database I created that spans several years of crime data. To facilitate a real-world scenario where I may simplify the interaction for a user by introducing a View that simply ...
5
votes
1answer
1k views

Can I change properties of several layers simultaneously?

I'm working on bulk data. I have a few hundred GeoTIFF images imported into a QGIS project, and I'd like to modify their layer properties - things like the no-data-value, transparency of certain pixel ...
3
votes
1answer
711 views

How to randomize colors by class in QGIS new symbology?

As a new user of QGIS, one of the tasks I frequently perform is creating a layer where polygons are colored by class, classified by some nominal field in the attribute table. I have developed a habit ...
8
votes
4answers
3k views

Open source software to merge large shape files

Some background: I have 2 polygon shape files with approximately 500,000 records each. The two files are identical in terms of field structure. Using ArcGIS 10.0 I can'nt merge these two files using ...
2
votes
0answers
799 views

OSGB36 to WGS84 reprojection 'error'

First off, I am a recent convert to QGIS and am greatly impressed with its ease of use and speed compared with the ESRI products with which I am more familiar - my congratulations and thanks to its ...
2
votes
2answers
1k views

QGIS is not able to find GRASS. Choose the path of installation folder of GRASS

I've downloaded and then correctly installed QGIS 1.7.4 for windows (Win 7 64bit is my version) in C:\Programs\Quantum GIS. But everytime I start QGIS this popup appear: "QGIS is not able to find the ...
1
vote
1answer
562 views

Reprojecting a shape to UTM33

I still have trouble reprojecting shape files :( I would like to reproject it to UTM33N / WGS84 (EPSG 32633) I think the projection of the shape might be Pulkovo 1984/ Gauss-Krüger Zone 4 (EPSG ...
3
votes
1answer
648 views

Cell calculations; QGIS,GRASS,GDAL,SAGA

I recently asked a question about trying to calculate the slope over distance (manually) using QGIS, but then I came up with another way of solving the problem, but I would have to get some help for ...
2
votes
1answer
812 views

Why does my PostGIS query fail with “current transaction is aborted”

I'm trying to create a vector layer in a QGIS project using a PostGIS query. QGIS is returning the following error: Query failed 1 cursor states lost. SQL: CLOSE qgisf1 Result: 7 (ERROR: ...
2
votes
1answer
506 views

QGIS Georeferencer - Image file imports too small

I am trying to georeference a largish aerial image (50MB) to some GIS data I have and import it as a background. However the image imports extremely small - so small I cant see it! I am using QGIS ...
4
votes
1answer
512 views

Using group by to set a PostGIS datasource using QGIS Python API

I am writing a QGIS Plugin and wish to obtain data from a PostGIS table using the Group By clause using something like the following code: uri = QgsDataSourceURI() uri.setConnection('localhost', ...
0
votes
1answer
954 views

Trying to Install on MAC OS Lion and getting Python error message

Brand new to this and struggling to install QGIS on MAC OS X with Lion, I am not a techy - but noticed in the install read me that /usr/bin needs to be added to the GDAL.frameworks path. Failing to ...
6
votes
2answers
1k views

Raster generalization - buffers in rasters, expand pixels?

Is it possible to create buffers for pixels of raster files? Actually I need to expand the pixels classified as 1 (in white in the figure) with a spatial range of 1 or 2 pixels, in order to perform ...
4
votes
2answers
1k views

How to create an animated map?

I am seeking to create an animated map illustrating the simultaneous movement of different objects across a large area over time. The display should be capable of playing automatically, or by ...
7
votes
2answers
3k views

How to use Heatmap plugin and its output?

I have a layer of points which I would like to depicted as a heatmap concentration of points for visualization. In QGIS 1.8 I tried the built-in heat map plugin, leaving the default values as is, and ...
0
votes
1answer
1k views

How to generate smooth contours from cropped raster?

I’m trying to create contours from a raster layer in QGIS. On my first attempt, I cropped my raster layer in Photoshop and reimported it, but it lost coordinate data I think. I made the contours ...
6
votes
1answer
5k views

How to crop raster layer?

Can anyone tell me how to crop a raster layer in QGIS? I want to make contours from a section of a layer, and including the whole layer will create far more data than I need and slow down the ...
1
vote
2answers
166 views

How to select only areas bigger than x acres?

I would like to create a new shapefile from another area shapefile. The new shapefile should only contain all areas that are bigger than 5 acres (10.000 m²). How do I do this?
2
votes
1answer
117 views

Generating plan sets using different layer configurations

I am working on a flood modelling project that will generate a very large number of plan sets. Each set will have several plans - say a general arrangement plan and say 5-10+ sheets tracking along a ...
1
vote
1answer
218 views

Spatial Query plugin broken in MacOS version?

I'm running QGIS 1.7.4-4 on a MacOS 1.6.8. I'm trying to use the "Spatial Query" plugin but it's not loading. The plugin is activated and I can see it in the main menu Plugins > Spatial Query > ...
3
votes
0answers
3k views

How to load and view .gri and .grd files in QGIS [closed]

An online GIS Repository called DIVA-GIS (http://www.diva-gis.org/gdata) offers data in three formats - ERSI files, "DIVA gridfiles", and DBF files The DIVA gridfiles have extensions .gri and .grd ...