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

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3
votes
1answer
709 views

Hydrologic analysis with sextante-saga in qgis

(rough translation): Hi, I want to do hydrologic analysis of a DEM with sextante-saga in qgis. I found the plugin and the needed algorithms in SAGA, enabled them in the sextante toolbox, but when I ...
4
votes
3answers
282 views

How to subset X number of features from Shape file in QGIS

I'm looking for a means to take a rather large Shape file and split it out into separate, smaller shapefiles based on number of features. So for example, if I have a file with 1 million features, ...
4
votes
2answers
1k views

Spatial distance analysis in QGIS

I'm quite new to QGIS and trying to figure out how to analyze the following problem. I have three layers: settlements point layer with 253 entries waste treatment facilities point layer with 24 ...
1
vote
1answer
148 views

Why won't QGIS let me write to a file?

I am writing a QGIS Python Plugin. I am trying to write data to a file using with open("filename.txt", "w") as f: f.write("file text.") QMessageBox.information(None, "Test", "Written to file.") ...
1
vote
0answers
272 views

DLL problem with PyQGIS

I am having problems with Python Shell importing the module "qgis.core". When I type "import qgis.core" the Shell ("idle.pyw") gives me this error: Traceback (most recent call last): File ...
2
votes
0answers
174 views

How to Create a Vector Field from Separate u and v Data Files?

I am using Quantum GIS and trying to create a vector field using data from two separate netcdfs. One contains the u data, one contains the v data. Can this be done, and if so, how? Thanks. Jason
2
votes
3answers
1k views

Spatial join including attributes - kind of like right join

I've run in to a little problem. I have two sets of polygons with important attributes. I need to join over the attributes from the first set to the other, but I can't seem to figure out how. ...
2
votes
2answers
126 views

Are you able to buffer labels to prevent other labels within the buffer area?

I saw a post that talks about label offsets, but that was in 1.7. I did some internet research with no success. Is there a way to apply a buffer area so that labels from another layer are not placed ...
4
votes
3answers
2k views

How to install QGIS 1.8 plugin Georeferencer?

My question is about qgis 1.8 georeferencer plugin. I installed the new version qgis 1.8 but I don't have the georeferencer plugins, how do I install it? I used the georeferencing plugin with QGIS 1.6 ...
3
votes
1answer
140 views

Help with intersections in QGIS

I have a shapefile which defines for me the area of each oil field in the North Sea (~300 fields). I also have a shapefile which defines the location of every well that has been drilled (~13000) ...
0
votes
1answer
65 views

QSpatiaLite query syntax

Using the QSpatiaLite plugin in QGIS I composed the following query SELECT 'AddressPoint_2'.'buildingNu', 'AddressPoint_2'.'postCode' WHERE 'AddressPoint_2'.'postCode' = 'NR13 3AA' FROM ...
3
votes
2answers
88 views

How can I fix incorrect links in my QGIS install?

Today I installed QGIS 1.8.0 and I have the same error as this one: How can I fix QGIS 1.8 startup issues due to missing qwt5.dll library?. The sollutions how ever don't seem to work. What I have ...
1
vote
1answer
131 views

Error after installing QGIS 1.8

I have a problem with the installation of QGIS 1.8.0. After finishing the installation two icons show on the desktop: Qgis desktop and Qgis browser. When I click on these, it shows the same ...
4
votes
2answers
2k views

How to change length to 2 decimal places?

I'm trying to work out how to calculate the length of a line to only 2 decimal places in QGIS. When I use the field calculator to create a new field, it doesn't matter what changes I make to the field ...
7
votes
1answer
456 views

How to make working with Postgis vector layers in QGIS faster?

I have just imported a Spatialite database into Postgresql/Postgis. The problem is: using QGIS to work with them is much slower in Postgis (spatial indexes created) than doing the same in Spatialite. ...
7
votes
3answers
483 views

How to use ZonalStats plugin?

I am using QGIS 1.8.0 on a Windows Home Premium 7 machine. I have a single band TIFF that is 187 MB in size. My vector polygon shapefile represents a regular grid of a 147x112 36kmx36km grid cells. ...
1
vote
1answer
92 views

Python error when running SpatiaLite with OSGB(27700)

I have a project open in QGIS and am trying to import an Ordnance Survey Address Point layer into SpatiaLite. I have recently installed the Qspatialite plugin. I open SpatiaLite in the DB Manager ...
0
votes
0answers
23 views

postgis: no module named psycopg2 [duplicate]

Possible Duplicate: psycopg2 error with QGIS 1.5 When I open DB Manager in QGIS I get what appears to be an error message at the bottom of the window:- postgis: no module named psycopg2 ...
2
votes
1answer
288 views

How to fix encoding problems with Turkish characters? [duplicate]

Possible Duplicate: How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0? My shapefile contains turkish (latin) letters. (see: ...
3
votes
2answers
530 views

Can I import a .gml file into Spatialite in QGIS?

I have some Ordnance Survey Address Base data files which have a .gml extension. I have imported them to GGIS as vector layers along with some mapping data but would like to explore them with ...
1
vote
1answer
81 views

How to find obsolete plugin?

I just installed a brand new copy of QGIS 1.8 Lisboa and all of the associated software on a Windows Vista PC using the Windows Osgeo4W QGIS installer, and I get this message: "The Plugin Installer ...
1
vote
1answer
788 views

QGIS & GeoMedia .mdb .gws compatibility?

i cannot open Geomedia file directly from QGIS 1.8.0! Gdal driver >= 1.9.0 reference is made to below link qgis-connecting-geomedia-mdb-warehouse anyone have any experience in using GeoMedia file ...
3
votes
4answers
923 views

What are the advantages either way between GML and ShapeFiles?

After a good start many months ago of getting into GIS through QGIS, I had to drop what I was doing and did not touch it for quite some time. I am now able to get back into it and have a need to load ...
1
vote
1answer
126 views

Looking for complicated representations of an urban areas

I would like to display some features of an urban area using a map, showing something like telecomunications, roads, or parks, etc. Also, is it possible to get an understanding of how to show more ...
4
votes
2answers
5k views

How to Split Features in QGIS?

I am new at using QGIS. How can I simply split features in QGIS? The manual tells to simply draw a line through the polygon you want to split. But it doesn't work. The line disappears when finishing ...
1
vote
1answer
82 views

Road number boxes dependent on string length?

I would like to have a coloured box behind each road number on my map, matching the colour of the road it relates to and scaled to the length of the road number. I understand this could be done with ...
5
votes
1answer
3k views

How does snapping in QGIS work?

I have read a number of posts and tutorials, even the QGIS manual on snapping. I set the snapping options under settings>snapping options; selecting the two layers that I would like snapping on, ...
2
votes
1answer
896 views

Is it possible to place a point at a coordinate in QGIS?

Is it possible to place a point at a coordinate in qgis? I have a map, using irish grid reference and wish to place a point at an exact 6 digit coordinate. Is it possible to do it. Previous to this ...
1
vote
0answers
312 views

Creating points along lines? [duplicate]

Possible Duplicate: How to create a point along a line given distance How to create equidistant points in QGIS? I have some road survey data and each line has an individual value and ...
5
votes
1answer
431 views

Predefined CRS and Custom CRS problem with Borneo projection

I loaded a shapefile layer into QGIS and assigned to CRS of EPSG:29873 (Timbalai 1948/ RSO Borneo (m)) I copied the Proj4 parameters from EPSG:29873 (above) and create a custom user defined ...
3
votes
0answers
190 views

QGIS does not open (installation problem?) [closed]

I downloaded QGIS 1.8.0 (Windows) and installed the software. Installation was completed succesfully. However, I cannot open the software. When I start the QGIS, I receive an error message "qgis.exe ...
5
votes
3answers
724 views

How to center a map in Print Composer to the same center as in map window?

I can't figure out how can I center the map in Print Composer to layer/object/map center in the same way as in map window in QGIS 1.8. Let's say I have layer which I want have in the center of the ...
4
votes
0answers
297 views

How to Perform a Grouping Analysis of Points to Divide a Polygon into n Number of Sub-Regions?

I'm attempting to create n sub-regions from a polygon based on a cluster analysis of a bunch of overlapping raster layers (physical layers, eg. depth, currents, waves...). Briefly, I can create a ...
3
votes
1answer
85 views

Lower the level of a label in QGIS

I am finding when I use label vector lines using the newer labeling tool that the labels always appear on top of the lines of that layer. And they appear on top of all other layers in my project. Is ...
1
vote
1answer
276 views

How to Force the Showing of Labels of a Vector File in QGIS

I imported some OSM data. I then label the lines (roads) with their "name" field using the new label layering settings dialog box. When I zoom to different scale levels I find that while all the lines ...
2
votes
1answer
103 views

Licensing of QGIS libraries

what type of license are subject to the following QGIS libraries? libqgis_analysis.so libqgis_core.so libqgis_gui.so I would like to use the following libraries released in QGIS package in a ...
1
vote
2answers
1k views

How to convert a Shapefile from bessel1841 to WGS84?

I would like to convert a shape file which has +ellps=bessel to +ellps=WGS. In my understanding, even QGIS1.8.0, it is impossible. Let me know the free software which is able to convert shape file ...
3
votes
1answer
99 views

How can I use a custom font in QGIS?

I would like to use a custom font to mark certain features on a map. It needs to be defined as an attribute as the features in question are part of a unified text layer that includes various ...
0
votes
1answer
61 views

QGIS startup error (out of range pointer)

I downloaded QGIS (for Windows) and installed the software. However, when I start QGIS, I get an error message: "The Instruction at 0x04c20d55 referenced memory at 0xffffffff. The memory could not ...
4
votes
2answers
320 views

Setting rendering order of line layers in QGIS

I have a dataset where different road types are in separate layers, i.e. motorways, primary roads and secondary roads. In turn, each layer is subdivided by embedded codes into different sub-types - 4 ...
3
votes
1answer
467 views

Getting dataProvider from vector layer outside QGIS

I'm using PyScripter to explore PyQGIS API because of it's very handy auto-completion function. I've managed to get a handle on a PostGis vector layer by: >>> from qgis.core import * ...
2
votes
1answer
1k views

Launching QGis 1.8.0 Lisboa on Windows 8 getting an error “the procedure entry point could not be located in the dynamic link library” [Solved] [duplicate]

Possible Duplicate: How to fix QGIS error “Entry Point could not be located”? I have a problem with QGIS 1.8.0 Lisboa installed on a desktop with Windows 8 Pro. When I launch qgis.bat the ...
6
votes
2answers
397 views

How to Center Text in Multiline Labels

I used wrap text on "~" and now I have two lines of text from one attribute field. Is there a way to center that and not just choosing center as the horizontal alignment? QGIS 1.8.
1
vote
1answer
83 views

Easy Labels do not show when opening project on another machine

Love the easy label plugin, once I got the hang of it. I opened the project file on my desktop after setting up all the labels on my laptop and they do not show. I assume they will once I open the ...
2
votes
2answers
2k views

OpenLayers plugin and QGIS 1.9: Error after install

After I install the OpenLayer Plugin (1.0.0) on my QGIS 1.9 this error appears: Konnte Erweiterung openlayers_plugin nicht laden wegen eines Fehler beim Aufruf seiner initGui()-Methode Traceback ...
2
votes
1answer
102 views

Where did the texture fill option go in QGIS 1.9 Master?

In the previous version (1.8) of QGIS you could select to fill a polygon using a PNG or JPG image. This option seems to have gone from QGIS 1.9 Master. I can get it by selecting the "Old Symbology" ...
1
vote
1answer
72 views

I would like to change all the values in a attribute field to the same text

So I recieved a great answer to this question, How to change all values in a field in one operation?, although I need some further information. I would like to change the values in the entire field to ...
3
votes
1answer
389 views

Relative Hyperlinks in QGIS without end user's software dependency

I am trying to work out how can I add a relative path hyperlink to a shapefile in QGIS. I have found several great tips on various forums but only one has so far potential to be implemented. The ...
5
votes
1answer
157 views

Is it possible to grow QGIS symbol size over time?

I've got a data set of people movements within my municipality. (between points of places) I've managed it with the plugin for QGIS 'time manager'. Over time people come and go, and based on a count ...
0
votes
1answer
57 views

Where can I find a list of valid settings for expanded data defined labeling?

I have seen this post What are valid values for "data defined" labeling settings?. Does anyone have any insight to the values within attribute tables required to satify the expanded "Data ...