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

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2
votes
2answers
109 views

“show only visible features” doesn't seem to work

I'm trying (unsuccesfully) to place the attribute table next to a map containing the same in print composer. Let's say for example my map in the primary window contains 6 districts and my map in the ...
4
votes
1answer
707 views

How does QGIS handle opening files and how can I improve this?

We are using shapefiles with a large attached database to it (162 Mb for 133000 features) Opening this shape file on a remote server takes about 5 minutes whereas DivaGIS takes 7 seconds for the same ...
4
votes
1answer
232 views

Surface covered by buffers in QGIS

In QGIS, I have plotted buffers around points. I would like to calculate the area which falls under buffers without over counting due to buffer overlaps. Is there a quick and easy way to do this?
2
votes
1answer
187 views

Point count within borders, in two different layers, using QGIS

I have a layer of georeferenced points, and a layer of vectorized borders. Is there a way I can use QGIS to calculate how many points fall within each area of the borders layer?
8
votes
3answers
1k views

Creating regularly spaced, defined # of points within polygon in QGIS

I used the research tool "Regular Points" to produce a certain number of points within a polygon, but it forms a rectangular grid of points rather than only within the shape of the polygon. Since I ...
1
vote
2answers
150 views

How to save label scales?

When I open a QGIS file, QGIS 1.8 resets the scale factors for all labels. Is there a way to save the file so that it knows to also save the label scales?
2
votes
1answer
759 views

Where can I find QGIS Cartogram plug-in?

Can anyone point me in the right direction of the cartogram plugin please? I've had a look on the net but can't find what I'm looking for. Thanks
3
votes
3answers
355 views

Unattractive image artefact when exporting from QGIS's Print Composer

When I export my map from Print Composer in QGIS 1.7.4, an odd red band appears across the middle of the image. This happens when I export to both PNG and PDF. Its not visible on the screen before ...
4
votes
1answer
426 views

Moved labels in QGIS 1.8 disappear on saving vector file

From other posts I worked out how to activate the "move label" icon and was successfully able to move a number of labels into the positions I wanted. However when I untoggle the "edit" function for ...
6
votes
1answer
369 views

How to create a drop down list?

I want to show a drop down list in the feature attributes dialog. Example: I have 3 different building zones. The hot Wohnzon A, B residential zone and residential zone C. Now I have an attribute ...
2
votes
1answer
274 views

How to avoid overlapping SVG icons and labels?

I've dropped a point and then selected a svg icon. But now I'm right next to the other points I want to label. Now you have the svg icon, but be on the label, that is, the label may no longer be seen. ...
3
votes
2answers
1k views

Update point coordinates in QGIS after manually moving locations in edit mode

I have imported point coordinates from a database, but I need to manually adjust a lot of the locations. Is there a way for QGIS to automatically update the point locations in the attribute table ...
4
votes
1answer
3k views

Import polylines and polygons into QGIS from CSV

I'm assuming this is a simple question, though my efforts have not yet found the answer! I want to import a large number of polylines and/ or polygons into one one or more QGIS layers in order to ...
2
votes
1answer
215 views

CMYK Lines and Fills in QGIS

In QGIS, you can apply CMYK to text, using the CMYK sliders palette. However, I can only find an RGB colour picker for lines and fills. Is there a way to apply CMYK to these elements? Thanks. Sean.
0
votes
1answer
171 views

Qgis - Running SDA4PP [duplicate]

Possible Duplicate: How to install SDA4PP plugin for Kriging in QGIS? I'm trying to use the SDA4PP plug-in for QGIS but it doesn't work. The software says to me that I need the rpy2 plugin ...
6
votes
4answers
254 views

How to map districts without showing features in other districts?

We want to have a map of each individual district, with the shops on it, so that the person responsible for each district can have a map of their territory. The reason I want to merge them is so that ...
2
votes
1answer
2k views

How to install fTools and Table manager

I've just make clean install of Qgis Lisboa under Ubuntu Precise. Latest Qgis version under Windows XP is very unstable (crashes every few minuter while editing shp file). After new installation ...
5
votes
1answer
197 views

Save user specified settings on flash drive

With some help in this forum I already managed to successfully setup Quantum GIS 1.8 on a flash drive (see my post on Running QGis from flash drive). QGis starts and runs stable on different ...
3
votes
1answer
360 views

How to connect a PyQGIS plugin with Postgres?

I have some questions for you: I created a python-plugin in QGIS, then I created a Qt gui fom my plugin and at last I created a Postgres DB now I need to make a connection between Qt-gui and ...
1
vote
1answer
531 views

Is there a way to set a fixed scale in QGIS?

In Arc, I am used to setting a fixed scale for the Data Frame, so when you zoom in and out the objects get larger or smaller. Is there a way to set a fixed scale in QGIS? At the moment, if you zoom in ...
0
votes
2answers
3k views

How to export a layer to DXF from QGIS?

How do I export layers as a dxf? When I go to Layer > save selection as vector file the resulting dxf file is empty.
1
vote
1answer
259 views

Cordenadas 2d transformacion a postgis desde QGIS

This is a three-dimensional shape file, I checked in ARCGIS, where the shape attribute indicates POINT ZM, This is the table fid 0 shape* point ZM atribut1 A atribut2 B ESTE ...
5
votes
2answers
624 views

rpy2 installation on Mac OSX. A still unresolved problem on StackExchange and rpy-list [closed]

following lgautier's advice on rpy2 installation on Mac OSX, I posted my request on rpy-list and got in touch with Yair Benita who said he could only install rpy2 through his default Mac OS X python ...
1
vote
2answers
271 views

Start-up error message in QGIS: Unable to load the extension GoogleLayers causes an error when calling its method initGui () [duplicate]

Possible Duplicate: Problems with Google layers plugins Impossible de charger l'extension GoogleLayers provoque une erreur lors de l'appel de sa méthode initGui() Traceback (most recent ...
9
votes
4answers
9k views

How to change a CSV layer attribute value from text to number?

I read in a CSV file for linking to a .shp file. All the variables that are just numbers came in as text. How do I change the text variables to numeric in QGIS?
2
votes
1answer
331 views

Bathymetry of Quarry Lake in QGIS

I've been asked to do a project that maps the bathymetry of a quarry lake. It seems like I've seen a feature in QGIS that would help with this if I took a bunch of depth points in the lake. Any ...
9
votes
1answer
5k views

How to run a simple python script for QGIS from outside (e.g. Sublime Text)?

I would like to run a few small and simple python scripts for QGIS (Mac) from "outside" of QGIS. With outside I mean in this context, either the normal os command line (terminal.app) or even better, ...
5
votes
2answers
805 views

How to automatically add vertices to lines every x meters?

I've made a vector grid using lines; the grid coverage is 100 km x 100 km and the lines are at vertical and horizontal intervals of 1000 metres. Each line in the grid is defined by two vertices, one ...
5
votes
1answer
505 views

Custom Geographic Transformation on QGIS

Is there a way to create a custom geographic transformation with specifics parameters in QGIS like in ArcGIS? Okay, I want to tranform SAD69 system into WGS84. Well, I'm in doubt because in ArcGIS ...
1
vote
0answers
251 views

QGIS Web Client Setup mapserv error

I have my web map up and running and am now trying to clean up a few recurring errors in the qgis-web-client-error.log. The error in question is: [error] [client 123.456.789.1] script not found or ...
5
votes
1answer
2k views

Setting up an application in QT Creator that uses QGIS API

I am a 15 year veteran of Java making my first entry in to C++ applications. I have a specific need to develop a desktop application that produces graphics type output as well as displaying imbedded ...
5
votes
2answers
4k views

How to draw a Circle with a set radius?

I have a site and want to draw an indicative line in a 5km buffer around the centre of the site. So I want to draw a circle with a radius of 5km. I have a tool for drawing circles and ellipses and ...
2
votes
2answers
304 views

What is better for spatial data analysis? REST or SOAP?

I am working on agriculture forecasting project. It is the integration of SOA, web services, ontologies etc. What is better for spatial data analysis ? REST or SOAP ? WMS, WFS are used but either use ...
8
votes
6answers
4k views

How to get “.GDB” Esri File Geodatabase in QGIS for MAC OSX 10.6?

I understand there are programs like OSGeo4W that allow windows users to work with File Geodatabases, but is there something similar for Mac OSX?
0
votes
1answer
561 views

How do I get feature count of a QgsVectorLayer?

I'm using this code to get features from QgsVectorLayer QgsVectorDataProvider* provider=theVectorLayer->dataProvider(); if(!provider) { return; ...
3
votes
1answer
283 views

Impossible to open the .qgs file I've just saved with QGIS 1.8

I'm using QGIS 1.8.0 on Mac OS X 10.6.8 (last stable version of QGIS I downloaded yesterday). After working yesterday and this morning on it, I'm trying to open it again, and QGIS asks me the ...
1
vote
1answer
3k views

How to create a circle with specific radius? [duplicate]

Possible Duplicate: Conflicting measurement units with buffer ftools I have a shapefile as input. How could I create a circle with a radius of exactly 500 meters, using QGIS?
5
votes
2answers
2k views

How to add links to PDFs in a Shapefile?

I have a problem. I want an attribute in a shape file named "Link" to add. The works are all fine. But then I would like to add a link in my directory. This link accesses a PDF. Now, this PDF is not ...
1
vote
2answers
300 views

Routing issues with pgrouting

I was using the pgrouting plugin to display the shortestpath. I used the plugin as suggested by underdark to display the shortest path in qgis. My source node is 283 and my target node is 172. When I ...
1
vote
3answers
611 views

can QGIS for Mac OSX 10.6 handle (both read and generate) GeoPDF files?

I would like to know if QGIS for Mac OSX 10.6 can handle (both read and generate) GeoPDF files. Can anybody help ?
2
votes
1answer
438 views

Plot the nodes of the shortest path found by dijkstra algorithm

I am using qgis and pgrouting plugin to find the shortest path between two nodes and display the route. Currently, the plot shows the shortest path. However, I also want to know which nodes the path ...
0
votes
0answers
165 views

Installation does not work

I tried to install QGis on my computer (Windows XP Professional) but it does not work at all. I do get the installation wizzard and I can complete that, but nothing happens. After completion, the ...
2
votes
2answers
179 views

Determine the furthest driving distance from a road layer to the nearest point of a point layer using OSM/QGIS

In a specific geographic area, I have a road layer and roughly 30 points dispersed around the geographic area as part of a point layer. Both layers are in SHP and PostGIS formats. The records from the ...
11
votes
2answers
2k views

How to concatenate labels in QGIS?

I'm using QGIS 1.8 on windows XP machine and I try to do a concatenation of several fields to label the names of my local roads in the attribute table, but I can not find the correct syntax. The first ...
2
votes
2answers
293 views

Unable to open QGIS after Installation [closed]

I have a Windows Vista (32 bit) computer. I tried installing and reinstalling (by uninstalling the software first) QGIS 1.8 a few time then went to version 1.7.4 and still encountering the same ...
1
vote
1answer
122 views

Node Visibility Within Layer

Is there a way within QGIS to hide/display (freeze/thaw) an individual node feature within a layer or does this control only exist at the layer level.
4
votes
3answers
1k views

Is there any way to add a google maps layer in a qgis web client project?

Is there any way to add a google maps layer in a qgis web client project? I made a qgis project using a google maps layer from OpenLayers Plugin. In my desktop project, this layer works fine. But ...
1
vote
1answer
429 views

How to get a signal when the geometry to a line in QGIS is changed

I am working on a plugin in QGIS and want to get a signal when the geometry to a feature(in this case a polyline) in my layer is changed. For example if I use the node tool to drag one of the nodes. ...
1
vote
4answers
3k views

ECW on QGIS 1.8 (Ubuntu 11.10)

I'm trying to deal with an ECW file with QuantumGis 1.8 Lisboa, on Ubuntu 11.10. Obviously it tells me that .ecw is not a supported kind of file on QuantumGis. I have tried to install all the ...
4
votes
1answer
2k views

How to create a hole in a polygon in QGIS?

I'm trying to use the tool "delete ring" in order to create a hole in a polygon. The geometry of the hole is another feature of the same shapefile I cannot manage to delete the part of the polygone. ...