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

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5
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1answer
859 views

Why do TIF loaded into PostGIS lose their colormap?

I have successfully loaded a TIF image (using raster2pgsql) into my PostGIS 2.0.1 database. I can load the raster image into QGIS and it displays in the correct space. However, it has lost all colour ...
0
votes
0answers
29 views

Multiline labeling [duplicate]

Possible Duplicate: How to create multiline labels in QGIS? I got it by following the second method mentioned by you.But my doubt is that how we can use multiline label property? You said ...
0
votes
1answer
140 views

Can QGIS wrap labels on second space?

The answer to this question tells us how to wrap labels on spaces. Is it possible to wrap labels on defined spaces? For example, wrap on just the first space or on just the second space. Secondly, is ...
3
votes
1answer
1k views

How to create multiline labels in QGIS?

How can I apply Multiline label option in the label property.Name field contains a lengthy name. I want to wrap it. How can I do it? please help me. My QGIS version is 1.8
3
votes
1answer
274 views

How to calculate buffer surface that falls within another layer's borders

The image below shows what two selected layers. One contains a series of borders, and the other a series of buffers. I am trying to obtain the buffered surface within each of the borders in the ...
2
votes
1answer
203 views

different labels at various scales

I have a locality layer of neighborhoods and suburbs from a spatialite database. How do I label this single layer with the neighborhood name at a lower scales, but as I zoom out, I would like the town ...
2
votes
1answer
754 views

Importing QGIS core into Python on OSX

I am interested in learning how to write standalone scripts using QGIS. An answer to my previous question directed me to the PyGIS CookBook which has the following instructions for importing the ...
3
votes
2answers
3k views

How to merge many individual KML layers into one?

I'd like to open a USGS KML file of bedrock geology for an entire county, but there are over 2,000 individual polygon layers. Does anyone know if there is a way to merge all of these layers together ...
6
votes
1answer
2k views

How to write standalone Python scripts using QGIS?

I've been learning how to use the Python Console in QGIS using references from qgisworkshop.org. I'm familiar with writing standalone scripts in ArcGIS and want to learn how to do the same with QGIS. ...
0
votes
0answers
27 views

Set buffer radius in metric units in qGIS [duplicate]

Possible Duplicate: What is up with QGIS buffer tool units? A similar question to this one has already been asked QGIS - Change unit of measure from degrees to meters, but none of the steps ...
4
votes
2answers
584 views

Looking for an explanation of QGIS Edit Widgets

I have noticed "Edit Widgets" under the Quantum GIS and would like to know in detail the use case and usage of this widget. For any opened vector file, under the Properties -> Fields Tab, for every ...
2
votes
1answer
128 views

interfacing multiple gps

I am trying to interface NMEA output of multiple GPS units transmitting wirelessly to a single PC, each GPS position can then be shown on georefance map of that area. My question 1.) How to ...
3
votes
1answer
2k views

How to draw a cross section in QGIS

Given my enthusiasm for QGIS, does anyone have a simple workflow for drawing cross sections of earth features? My thing is that QGIS is being used to present the plan view, but we have a little ...
3
votes
1answer
400 views

QGIS Polygon layer table of adjacent polygons

In a polygon layer, how can I generate a table of adjacent polygons?
5
votes
2answers
5k views

How to calculate polygon areas and perimeters?

If I load a polygon layer and make a new column, how do I fill that column with the 1) area of each polygon and another column with 2) the length of the perimeter of each polygon?
3
votes
1answer
1k views

How to import LAS to QGIS? [duplicate]

I need to import LAS files to Qgis. I´ve never worked with Qgis till now. Could anybody explain me this problem to the details? I´ve installed Quantum GIS v. 1.8.0. Thanks
1
vote
1answer
375 views

how to open layers with multiple geometry types in qgis?

I recently had some difficulties opening some MapInfo TAB vector layers in QGIS because each MapInfo layer contained two different geometry types: point and line. The MapInfo layers had originally ...
2
votes
1answer
889 views

SID and/or ECW support on QGIS for Linux

Running QGIS on Ubuntu 11.04 and QGIS for Android on Galaxy Tab 10.1 (which is an awesome project by the way) NEED to figure out a way to get SID and/or ECW files loaded. Saw some posts about ...
2
votes
2answers
110 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
717 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
236 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
190 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
764 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
357 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
428 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
375 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
277 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
2k 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
220 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
172 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
258 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
199 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
540 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
635 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
275 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
334 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
815 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
511 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
255 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 ...