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

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1answer
236 views

How to select features where attribute is not NULL?

I have an OS AddressBase shape file. One of the attributes is 'paoText'. It is either a text string like 'Anchor House' or is NULL. I want to extract all the records where there is a text string ...
2
votes
1answer
197 views

How to get all attributes from a non geometry PostGIS layer with Python in QGIS?

I want to extract all attributes from a non geomety layer in QGIS with Python, but there is only the function uniqueValues(fieldIndex) More specific: I have a postgresql table which is loaded into ...
5
votes
1answer
450 views

How to view a 155 MB raster stored in PostGIS?

I am using the following command to load a raster into a postgres database: raster2pgsql -I -C -e -Y -F -s 3086 -I -C -M myraster.tif myraster -F -t 30x30 | psql -U postgres -d database -h localhost ...
6
votes
1answer
173 views

Is there a 'QGIS Browser' app on mac?

Starting at 1.8, there's a standalone Quantum GIS Browser application on Windows. I am unable to locate that app on Mac. There is a 'Browser' panel for Mac but its functionality is limited.
3
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1answer
483 views

How to use QGIS Photo import plugin?

I have a lot of Photos with lat, long, and altitude information. When I start the import, I get an error message. Do I need to prepare a blank point layer before importing? Is there another python ...
1
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1answer
154 views

Is there any python function to rotate map layers?

Is there any python function allowing a user to rotate map layers in the map canvas. If so, could you please point this out for me? I want to rotate a map layer, using a factor of rotation in ...
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0answers
267 views

How to run actions in QGIS web client?

In practice the QGIS web client will be a companion to an existing cloud database with a portal and forms. My intent is to run 'actions' (like in QGIS) where clicking on a feature launches the portal ...
3
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2answers
1k views

How to edit Shapefile Attributes?

How might I go about exporting a polygon shapefile (e.g. CSV) so that attributes (not geometry) are editable by others, and importing it with the changed attributes (of which there are several columns ...
2
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3answers
394 views

In QGIS, layers properties dialog box is active but not visible. How do I get it back?

When I right click on a layer, then click on 'Properties' I would expect the Properties dialog box to appear so I can change the style, add labels etc. For some reason the box doesn't show. It ...
1
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1answer
206 views

Can QGIS Web Client be used with SQL Server based QGIS project?

question: We are running a QGIS project with the majority of data coming from a SQL Server 2008 database as well as some third party WMS feeds. Will QGIS Server and QGIS Web Client be compatible ...
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2answers
232 views

QGIS regular points around each polygon in a layer (vs ALL polygons)

I have a number of buffered points (some where polygons intersect & are dissolved. I'd like to create regular spaced points grid around EACH polygon -- not ALL polygons. When I do Vector -> ...
6
votes
2answers
481 views

Why don't GRASS tools work in SEXTANTE? (QGIS, MacOS)

I've got both SEXTANTE and GRASS installed on my platform. GRASS-SEXTANTE report an error when I'm trying to create the Modeller, however, other tools (R) work fine in SEXTANTE. Do these tools have ...
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1answer
124 views

QGIS and Ubuntu 'browse' dialogue causing crashing

Below is an image of 'the suspect dialogue' in Ubuntu that when you encounter it in QGIS you are most definitely going to crash the application. http://ow.ly/i/ZGNc/original You find this ...
6
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2answers
3k views

Create a polygon layer from point data

I'm currently using QGIS 1.8.0 I would like to create a polygon layer from a point dataset, where the size of the polygons relates to the resolution of the grid reference. The ultimate aim would be ...
3
votes
1answer
284 views

Is it possible to programmatically add calculated fields?

In the Memory provider described in PyQGIS Cookbook or in question How to create a new empty vector layer programmatically? I can see how to create a vector layer programmatically using standard ...
4
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1answer
583 views

How to zoom to point and place a pin?

Is there any means to combine the function of zoom to point and place a pin plugins in QGIS? Would it be possible to enter a xy co-ordinate and a pinpoint is placed at the point of the grid reference. ...
5
votes
3answers
802 views

Can I open ArcView 3 project files (*.APR) with Qgis? Is there a converter?

I would like to open files from an old ArcView 3.x project with Quantum GIS to work with the data. But this project data is saved as an APR-file, which I can not open with Quantum GIS. Is there any ...
3
votes
1answer
287 views

How to lock map labels for inset map in Print Composer?

OK, so I am making a print layout which has two maps, one an inset map with just a skeleton of a line layer and the other is the detail map at higher resolution. In the detail map, I want to show the ...
4
votes
2answers
254 views

Is there a way to load a kml raster super-overlay in QGIS?

I have created a set of tiled rasters as a super-overlay in Google Earth, and it performs remarkably well. Is there some way to load a super-overlay as a layer in QGIS? I am wondering if this could be ...
4
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3answers
362 views

Can I have Points, Lines and Polygon features in one QGIS layer?

I have a situation where planning is done on a "base map" consisting of rivers, contours, roads etc. There is a need to create a "overlay(s)" over the "base map" consisting of drawings, that could be ...
4
votes
1answer
599 views

How to automate the drawing of polygons (square) around a number of points in QGIS?

In QGIS (or alternatively any other scripting + GIS stack), how can I automate drawing a 100km x 100km square around a number of points, with the point being dead in the center? I'd need to loop ...
2
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1answer
291 views

Issue installing Qgis 1.8 Openlayers Plugin on Win XP

I recently installed Qgis on a Win XP PC. All seems fine. I went to install the Openlayers plugin using http://build.sourcepole.ch/qgis/plugins.xml and I get and error saying the plugins directory ...
2
votes
1answer
150 views

How extract data from a SNODAS file

I'm trying to extract data from a raster file from "Snow Data Assimilation System (SNODAS)" and convert it to a MMQGIS (plugin) grid layer (Hexagon) with QGIS. This raster file stores the snow depth ...
3
votes
1answer
292 views

Zoning and land lot map in QGIS

Our office is using QGIS to design zoning maps. Our maps display the zones in colors (area shapefile with "Zone" text attributes) and the parcels with a thin outline and the number as label (area ...
4
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1answer
293 views

How to start from scanned maps in qgis

What I have: A large TIFF covering parts of several contiguous sheets of the British OS 6 inch first edition. It has no georeferencing. It's just a series of scans which someone has stitched ...
3
votes
2answers
126 views

Connect QGIS to the custom application server

I'm new to QGIS and investigating how to migrate one home made GIS application on QGIS. The biggest difficulty for me now is to find the way how to plug QGIS to the application server that is being ...
2
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2answers
487 views

How to georeference a LANDSAT scene in QGIS 1.8?

I tried to georeference a LANDSAT scene in QGIS 1.8 but I failed. My first question is Can I use geografical coordinates as x,y coordinates of control points? or I need projected coordinates (from ...
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0answers
99 views

QGIS 1.8 map composition problem

I have recently installed QGIS 1.8 when I make a map with the adequate layer I switch to the map composition menu and try to insert a map in the white page. I draw the rectangle but nothing appears ...
2
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1answer
124 views

How to lock the legend in print composer?

I locked in the print composition (Druckzusammenstellung) the legend (attachment1). Then I saved the print composition and opened it (attachment2). But the locked legend is not locked? The changes ...
3
votes
2answers
603 views

How to upload polygon shapefiles to my GPS?

I used QGIS to create a table (*.shp) containing 3 polygons. These polygons represent "forbidden zones" that I would like to export to my Garmin GPSmap62st so once on the countryside, I'll can see my ...
10
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1answer
264 views

Open-source software for managing terabytes of different formats of geospatial data?

I have a problem that I am sure many GIS Teams or Departments have which is how to find, keep track of and manage multiple different datasets from multiple sources. I have read the responses from a ...
1
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1answer
182 views

run sql on Qgis

I want to do simple demo to our manager with quantum gis. i have buildings from my city with wgs84 projection on postgre sql database and also have non gis table which have who leaves this buildings ...
3
votes
1answer
193 views

Why can't I save my custom CRS?

I am unable to create custom CRSes in QGIS. The 'save' button doesn't seem to have any effect. My best guess is that I don't have permission to save in the folder or database where custom CRSes go. I ...
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2answers
282 views

Cannot get changeAttributeValues() to work in a loop

I'm trying to use QGIS to loop through a set of points, find their elevation from a DEM and use that value to update the point layer's attribute table. The loop works fine until I try to use ...
3
votes
1answer
853 views

Is it possible to increase/reduce features proportionally?

Is it possible with QGIS to increase or reduce features (polygons or lines already drawn) proportionally? Preventing me to redraw several times new polygons :) See picture above: Making it possible ...
5
votes
2answers
279 views

Can I load a country-size OSM file in QGIS?

I've tried several ways to display OSM data in QGIS, but none of them really worked well for me. For example, I've tried WMS layer, but when I try to print high resolution, it won't give me enough ...
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0answers
357 views

How to Sextante model builder within QGIS to convert KML to shapefile?

Are there any tutorials on how to use Sextante within QGIS? How I could use Sextante model builder in QGIS to convert KML to shapefile? This is a routine task and Sextante would really help. I am ...
3
votes
1answer
79 views

How to merge rasters with negative extents?

I'm trying to form a mosaic from two overlapping images of an old tithe map. I've used the georeferencer plugin using one of the images as canvas to generate a modified version of the other. I then ...
3
votes
0answers
127 views

Does QGIS have WMS-T (WMS with time) support?

Does anyone know if there's support for WMS-T in QGIS? Through the app I can add WMS layers, but I can't work with WMS-T (there's no place to set the time parameter). I been going through the the ...
5
votes
1answer
2k views

Importing KML in QGIS - what are all the node elements that QGIS looks for other than Name and Description?

Of all elements given at (ref: http://service.kmlvalidator.com/ets/ogc-kml/2.2/) only Name and Description seem to be recognized on importing KML using QGIS 1.8.0-Lisboa. I would like to know if this ...
0
votes
1answer
1k views

QGIS: creating lines from starting to arrival points?

Is it possible in QGIS to create lines from a table storing the X,Y-coordinates of starting and arrival points? So that a line.shp is automatically created? Or exists a plugin to achieve that? ...
5
votes
2answers
935 views

How to link to external files with relative path in QGIS actions?

Objective: I have point layers with attributes contain paths to external files (visio, autocad dwg...). I want to put them all in one folder together with the project file, compress the folder into a ...
3
votes
1answer
201 views

How can I reload a csv-file within qgis

I use Qgis to illustrate the results from my Matlab simulation. Matlab produces a csv-file which is connected to a shapefile within Qgis. At the moment I have to close and reopen Qgis to show the new ...
1
vote
1answer
175 views

How can I recalculate an attribute based on overlap with another layer?

I have 2 layers: The first one is a point Layer (converted from SRTM) with height information. The second one is a polygon layer (shows the forest). I want to reduce the height value - let's say ...
2
votes
2answers
550 views

How do I fix an error starting QGIS 1.8.0 on Windows XP?

I note that the installation of qgis completed successfully. However, the log procedure returns this message: "...... Estrazione: wvhpgn.gsb Estrazione: wyhpgn.gsb Cartella di destinazione: ...
3
votes
1answer
455 views

QGIS custom CRS for map of manufacturing shop floor

I'm working on a web app that shows a map of a manufacturing plant's shop floor. I've built it in Inkscape and QGIS, but when I try to load it into Tilemill, I get a CRS error. Specifically, it ...
2
votes
1answer
167 views

Why does the map legend not update in print composer?

I'm having trouble with the QGIS map composer: If I change the map in QGIS and reopen the map composer and click on update, the legend elements DON'T update! For example: Before one certain country ...
4
votes
2answers
592 views

How do I get the path of a project, or layer file in PyQGIS?

I am generating new raster files from vector layers on a project. I would like to save them in the same directory as the project or layer files. How do I find this path using PyQGIS?
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0answers
38 views

Only one row displayed when opening attribut table

When running the example data for Alaska, the attribute table view for Lakes only shows the first row. All lakes are displayed in the map view.
0
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1answer
226 views

How to debug QGIS installation problems on XP? [closed]

I'm installing Qgis (Standalone 1.8) on all the PCs of the town planning office where I work. All good for 4 computers, on the fifth installation does not work. Computers have all XP with SP3. In ...