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

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3
votes
1answer
269 views

How can i merge lines with same name and intersect each other?

I have shp file with 50k lines (roads). Many roads have same name like 'high road' . some of them are the same road (they intersect each other) and some are located in different places of the city. I ...
5
votes
1answer
591 views

How to change QGIS back to English?

When I booted up my windows machine this morning my menus had switch from English to what I think may be Russian and I can't read the menu options. I have tried unistalling, rebooting and then ...
3
votes
2answers
301 views

WMS layers don't draw in QGIS or ArcMap but do in OpenLayers

WMS Map was published by myself in AutoDesk Infrastructure Map Server 2013. I can connect and load detials (properties / metadata) in QGIS Browser, ArcCatelog. I can load the wms into QGIS desktop and ...
5
votes
1answer
542 views

How to force RGB in a raster in QGIS?

I have rasters in 1 band 64bits float that represent real data values and for which I can set min and max using the stretch to min and max option in QGIS. I would like to convert these rasters to RGB ...
0
votes
1answer
257 views

How do I repair NVIZ error: 'Can't find a usable init.tcl'?

How do I repair the following problem: The error occurred while I was trying to run NVIZ in the GRASS environment in QGIS. NVIZ however runs perfectly in GRASS. On checking the directories ...
1
vote
1answer
185 views

Is the GIS Repository In Ubuntu in a different stream than the main repository?

I was checking out this: https://wiki.ubuntu.com/UbuntuGIS and it outlines how to install PPA for GIS. I performed a basic apt-cache search on a few things and QGis and mapserver are available. Such ...
1
vote
3answers
976 views

Where is the QGIS Parallel Line Plugin?

Somehow I believe to recall there does exist some ind of "draw paralel line" plugin for QGIS. Could anyone please point me to - I cant find it :-/
1
vote
1answer
287 views

QGIS crashes when adding vector layer from mysql or testing connection to mysql

For a while I have been adding layers from my mySql database and all went well. Then I got crashes when adding new vector layers. Then I only got crashes and it is not possible to add layers from ...
3
votes
1answer
143 views

Why can't I edit polygons once they have been saved to MySQL?

I have a simple table with an id field and a polygon field in mySql. Using QGIS I can add new polygons and give them an id. Before saving them I can also edit them. But once a polygon has been saved ...
2
votes
2answers
345 views

Keeping package dependencies for QGIS master up-to-date

Not for the first time, QGIS has broken due to unsatisfied package dependencies. This is not surprising, as I'm using the 1.9 Master version which is released nightly, and the package dependencies ...
2
votes
1answer
76 views

remember QGIS instance

it would be absolutely great if someone could help me with the following problem: I have a simple Python-Plugin that starts another executable in a subprocess. From within this application (which ...
6
votes
1answer
192 views

How to consecutively number polygons from north to south following a polyline?

I have a shapefile (polygon) with a large number of polygons (roughly 10,000) that form a narrow but very long belt that windes through half a country and another shapefile (polyline) that represents ...
2
votes
1answer
241 views

How can I merge segments to one segment in QGIS (picture inside) and than get the center of each road?

I want to run a process that will make a table with lots of roads into distinct table of roads and than calculate the center of each road. How can I auto merge segments with same name to one long ...
3
votes
2answers
110 views

How to use geometry functions in rule based styling?

Edited: I'm trying to style some OSM data such that short fences, walls, etc just don't render. I only want to display barriers over some certain length. I've tried this rule, tags LIKE '%barrier%' ...
2
votes
1answer
127 views

Error when importing vector layer into GRASS

I am trying to import a vector layer into GRASS, but I keep receiving the same error. The values in the vector layer are important because I would like to use them to create a heatmap. What could I ...
3
votes
3answers
355 views

How to install the QGIS Statist plugin in Mac OS X?

I'm trying to install the Statist plugin. I'm running MacOSX 10.7.5. with Python 2.7.3. and Numpy 1.5.1. I have also installed matplotlib 1.1.0 (for python 2.7). When I try to install the Statist ...
5
votes
1answer
674 views

Distance Matrix tool in QGIS. How to get result in metric? [closed]

I'm trying to calculate the distance between points in layer with distance matrix tool. And keep getting strange results no matter what. Like this MASTER ------------SLAVE ---------------- DISTANCE ...
0
votes
2answers
166 views

QGIS equivalent to “Features to Line” ArcGIS tool

I have a python script in Arc10 that uses the features to line tool. I however don't have the license to run it. I was wondering if there is a Qgis tool or process that would essentially do the same ...
5
votes
2answers
965 views

Where can the GDAL executables be found in a QGIS installation?

I run QGIS 1.8.0 Lisboa on a Windows 7 machine. Yesterday I attempted to install the TauDEM plugin using these instructions: http://lists.osgeo.org/pipermail/qgis-developer/2012-June/020807.html ...
5
votes
1answer
239 views

How to create a heatmap using values?

How do I create a 'heatmap' in QGIS based on the values of the different points? I did do this once before with rainfall, but can't remember how!
1
vote
1answer
84 views

Have editable label locations (dynamic) on a layer on which there is query

Is it possible to have dynamic labels, set by editable x y parameters in the attribute table, on a layer which also has a query applied, in QGIS? i.e. I want to set the query and get all the ...
0
votes
2answers
802 views

How to increase RAM allocation to QGIS? [closed]

I am using QGIS 1.8.0 and it runs slowly (with huge layers the size of NSW, Australia) and it appears that QGIS is limited in its RAM allocation to 128.9MB. How can I increase the speed with which it ...
1
vote
1answer
321 views

count lines in polygons

I found the following link to a post saying that a count lines in polygons had been added to ftools for QGIS: http://hub.qgis.org/issues/4712 However I can't find how to access this feature nor any ...
1
vote
0answers
232 views

How to update polygon field with point count for multiple rows? (Temporal point-in-polygon)

I have a shapefile with several regions. It contains basic info like ID, Code, Name1, Name2, etc. It is overlaid with a shapefile of points (nearly 200k). Each point represents an event with a type ...
6
votes
1answer
120 views

How to change all values in a field in one operation?

I am setting up a couple of shapefiles with text x, text y, text rotation and text size fields in order to utilize the labeling toolbar where I can move and rotate labels. I would like the values for ...
6
votes
1answer
641 views

How to calculate te area between contour lines on a DEM with Qgis 1.8?

Does anyone know how to calculate the area in km² for each altitudinal band (between 100 and 200, 200 and 300...) based on a DEM? I added the contour lines with a distance of 100 metres but could not ...
4
votes
0answers
99 views

Is there a way to run the spatial query plugin from QGIS python console? [duplicate]

I want to get all contiguous polygons for every county. In QGIS I can do this manually with a Spatial Query, but for a large data set this result impractical. Is there a way to run the spatial query ...
2
votes
1answer
359 views

Orthogonal Height Profile along line (sextante -> v.segment, r.profile?)

While trying to find a way to find "valleys/ridges" within a DEM, I'd like to know if there are tools, plugins or "methods" known or available to automatically generate height profiles along a given ...
5
votes
1answer
155 views

Calc bottomline of valleys

Which way do I calculate bottomlines of valleys or even more preceise: which way do I "find" valleys (for example suggested tectonic faults). Sample below shows a height profile (profile from line) ...
6
votes
1answer
115 views

Styling broad lines with short dashes

I'm looking to style some lines in QGIS to look like the steps in OpenStreetMap's default style. Actually, I'm styling those same steps on my own machine. Basically, unless I'm missing something, ...
6
votes
2answers
2k views

How to calculate Network Service Areas in QGIS?

Is there any way in QGIS to apply service area buffers e.g if I have a point on a map I wish to show the service coverage of 1 mile, 2 mile, 3 mile, breaks using the road network?
4
votes
3answers
2k views

Where can I download the exercise data for The Free Quantum GIS Training Manual?

Where can I download the exercise data for The Free Quantum GIS Training Manual? The pdf of the manual just mentions the sources of the data, but doesn't give any links.
4
votes
2answers
2k views

How to Split a vector file into several different files using a Grid in QGIS?

I have a shapefile containing contour for a large area, and I want to split it into different shapefiles each covering a 1KM X 1KM area. I have already created the required Grid shapefile in QGIS. ...
3
votes
1answer
353 views

Qgis analysis on polygon

I have a data table mapped and the table also contains further information of interest, beyond the lat/long of the specific data points. I want to be able to draw a polygon and then simply have a ...
3
votes
0answers
263 views

Building Qgis-1.8 on Scientific Linux - a sip error occured

I'm on Scientific Linux 6.3 and after trying to build Qgis 1.8 fter "ccmake" I got the error: [ 89%] Built target translations [ 89%] Generating analysis/sipanalysispart0.cpp, ...
1
vote
2answers
692 views

Exporting shp into a GPS [duplicate]

Possible Duplicate: How to convert .shp into .gpx using QGIS? I'm trying to convert a shapefile with some random points into a gpx file, but I'm having some problems: when I upload the gpx ...
3
votes
1answer
71 views

QGIS projects - collaboration on different platform

on my computer, I have both - Ubuntu and Windows - operating systems. Since I work on both of them and QGIS save path to particular layers using absolute path, it's very inconvenient to store ...
2
votes
1answer
64 views

Different typesets for labeling within one project

I'm searching a way to show labels with a western typeset, as well as a differnt one. In my case thats western (English/German/...) PLUS Russian, which I don't speak at all. But I'd like to be able ...
0
votes
0answers
106 views

Can osm way records in SQL spatial be merged to one geographic record if they have same Id?

I've imported England shp file of roads to mssql using OSM2MSSQL and I've noticed that the same road has couple of records with same Id but different geographic (probably it was segmented). Is there ...
5
votes
5answers
2k views

How to calculate distances in a point sequence?

I'm looking for help calculating the distance between a sequence of points that are in a single Shapefile in QGIS. Below is what my data look like and a blank distance column I've added to show how ...
2
votes
1answer
536 views

How can I use QGIS to convert points with elevations to DXF?

I'm trying to convert points (with their elevations) into a dxf file for use in AutoCAD LT. I've tried "save as" to dxf for the layer, which appears to almost work...the dxf has x and y location ...
3
votes
2answers
916 views

How did QGIS fix a shapefile's character encoding, and can I do this on the command line with ogr2ogr?

Solved: I'm not sure why, but it works fine if I specify --config SHAPE_ENCODING "ISO-8859-1" in my ogr2ogr command. For whatever reason, this allowed ogr2ogr to go from the original TigerLine ...
3
votes
2answers
456 views

Why do I get “Failed to transform” when reprojecting from WGS84 to Google Mercator?

I am attempting to re-project a vector shapefile from Natural Earth, following a qgis tutorial. Another user reported this error, but a solution has not yet been reported. Given this post, and the ...
6
votes
3answers
2k views

How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0?

I'd like to ask whether there is a way to read greek fonts in a shapefile's attribute table within QGIS 1.8.0.
3
votes
1answer
126 views

Button to add a new line in a non-spatial table without opening the table itself using QGIS?

While using QGIS and having loaded a non spatial table (from PostGIS), is it possible to add a new row to its table attributes without having to open the attribute table first as in here Is it ...
2
votes
1answer
316 views

How to bulk delete shapefile columns?

I have shape-file with next attribute table: - name of features, unique number for each feature of layer I must split shape-file by NAME field, but in result in attribute tables of layers should be ...
4
votes
1answer
1k views

How to remove duplicate point features?

I have created many .gpx datas with my Garmin device, but due to the amount of data, I have imported the mapping data from my device several times (also because I didn't want it to be lost)... As a ...
0
votes
2answers
228 views

How do I drop the z value from the geometry and transfer it to a new field?

Having a points shapefile with z values, how do I keep in the geometry only the x,y values? I also want to move the z values to a newly created double field.
0
votes
1answer
472 views

Why do I get an OGR error when attempting to save an edited Shapefile?

I often get an ogr error when I try to save a shapefile after working on it in Qgis ( adding features, removing, modifying attributes.. ) The error says : "OGR ERROR : Attempt to delete shape with ...
1
vote
0answers
308 views

OGR-Driver GML axis order handling (GDAL, QGIS)

By default the OGR-Driver will swap the axis order to longitude, latitude for geographic coordinate systems. "Since OGR 1.8.0, the GML driver has coordinate system support. This is only reported ...