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

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2
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2answers
3k views

Can I create a TIN from contours lines (shp) in QGIS?

I need to do a slope analysis, and would like to make a TIN from 2m contours lines. Or do a slope analysis directly from contours? The only DEM available is not precise enough. I do not have any ...
2
votes
1answer
277 views

Problems with NAD27 projection in QGIS

I have some data that is in NAD27, but I am having a hard time displaying it in QGIS. I think that the problem is with the CRS. I cannot seem to find the correct NAD27 option. The closest one seems ...
2
votes
3answers
10k views

How to convert shape files (.shp) to Cad (.dwg ) format using Quantum Gis 1.7.0?

How to convert shape files to .dwg format using Quantum GIS 1.7.0 ? Thank you
2
votes
2answers
700 views

Couldn't load plugin fTools due an error when calling its classFactory() method

When I start qgis I get a python exception: Couldn't load plugin fTools due an error when calling its classFactory() method ... 309, in _import mod = _builtin_import(name, globals, locals, ...
2
votes
1answer
2k views

How do I get and install the latest version of QGIS in Ubuntu?

I'd like to get the latest 64-bit dev build of QGIS on my Ubuntu setup. How exactly do I go about it? I assume it's some kind of arcane terminal command...
2
votes
2answers
137 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 ...
2
votes
2answers
863 views

How to delete rings automatically using QGIS/Grass

I'm cleaning up a (very) messy shapefile in QGIS/Grass. I now have several large polygons with numerous (100s) of small rings. Is there a quick and easy way to remove/ fill all these small rings. ...
2
votes
1answer
239 views

How to create/add features without geometry?

I have a simple SpatiaLite geodb loaded in QGIS with one table. There is a POINT geometry field and some alphanumeric fields. In some cases I can record data about a specific site, but the ...
2
votes
1answer
858 views

Reprojection from WGS to Slovenian Gauss Kruger in QGIS

I have gpx file (track) in WGS84 (EPSG: 4326) coordinate system from Garmin GPSMAP 62 which is right projected in BaseCamp and MapSource. When I save track as *.GPX and import it to QGIS and use ...
2
votes
1answer
436 views

Is there lat/lon grid option in QGIS?

For example, I have georeferenced layer loaded and I want lat/lot grid or at least some ruler in QGIS display canvas, to suite me as a helper. It looks like only reference is cursor tracking in status ...
2
votes
1answer
847 views

How can I fix QGIS PostGIS Manager error 'shp2pgsql' is not recognized?

I have QGIS 1.8.0 installed via OSGeo Installer and work on win 7. All I need is to upload the shapefile to the database via this plugin. Unfortunately I am receiving an error: Something's wrong: ...
2
votes
2answers
622 views

Why is Spatialite delivering “Invalid SRID” error message

Qspatialite in QGIS 1.8 (and also Spatialite-gui) delivers an "Invalid SRID" error message when I try to load shapefiles with a SRID value of 3814 (Mississippi Transverse Mercatur). The SRID is ...
2
votes
1answer
222 views

How to label a selection of an OSM layer depending on certain tags?

I just imported original OSM data to export a pdf-map by assigning graphic attributes to the features I need. The label tool in QGIS 1.8 allows to select certain features, like I can do with the ...
2
votes
1answer
883 views

Rendering GML in QGIS 1.9.0

I have a set of GML geometries (see here), which I try to load in QGIS. The set contains both points and polygons, but when loaded into QGIS, only points are shown. I tried to follow this thread, but ...
2
votes
1answer
249 views

How to avoid map refreshes in print composer?

I am trying to make a report with the QGIS composer. This report contains multiple maps. I don't have any trouble to make it, I just have to lock the maps with a right click to avoid them being ...
2
votes
2answers
607 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: ...
2
votes
4answers
6k views

How to import shapefiles into MS SQL 2008 and then view that data using QGIS?

I'm a QGIS users but not a database person and I need some help on the DB side. I'm currently in the need to import several shape files into MSSQL 2008 and I have no clue how to do that and my IT guy ...
2
votes
4answers
1k views

QGIS locked into fullscreen mode on Ubuntu 12.04

No crash in this case, but I made the mistake of toggling to fullscreen mode on my netbook running Ubuntu 12.04. It's now impossible to escape this "No Menus" view, and it seems to have disabled the ...
2
votes
3answers
799 views

Is there any way to reproject multiple layers in QGIS?

I'd like to be able to consolidate not only the layers of a QGIS project (using QConsolidate) but also the projections used by each layer. On-the-fly projection reduces performance in QGIS, and this ...
2
votes
3answers
1k views

An error has occured while executing Python code while doing home range analysis (Qgis 1.8.0)

It keeps appearing: Traceback (most recent call last): File "C:/Users/Worten/.qgis//python/plugins\HomeRange_plugin\HRplugin_dialog.py", line 80, in QObject.connect(self.buttonBox, ...
2
votes
1answer
2k views

Why is my .prj file not being read by QGIS?

First off, I am new to GIS. I am using qgis (1.8.0), and have been given a shapefile containing .shp, .prj, .shx, .dbf, however qgis will not load the .prj file stating an invalid data source. ...
2
votes
1answer
235 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?
2
votes
1answer
268 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.
2
votes
0answers
422 views

Mean coordinates in QGIS

I am using QGIS v 1.7.4 for MAC and I am trying to calculate mean coordinates for a set of points using ftools. To calculate my result I am going to Vector -> Analysis tools -> mean ...
2
votes
1answer
669 views

Python 3 support in QGIS?

As python3 is getting standard more and more I wonder wether there is or will be support for python 3 in QGIS?
2
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0answers
175 views

Polygonize problem [duplicate]

Possible Duplicate: Polygonize function doesn’t overlay the shape file over the raster file When using "Polygonize" in Quantum GIS, I'm getting a polygon shapefile output that is a mirror ...
2
votes
0answers
1k views

Qgis 1.8 fails to install

QGIS 1.8 will not start on Windows 7 Basically a similar issue as the above post. Version 1.8 fails to install with the standalone installer; with OSGeo4w, while it doesn't run into trouble during ...
2
votes
2answers
3k views

QGIS 1.8 will not start on Windows 7 [closed]

I have downloaded QGIS 1.8 and installed it on my windows 7 system. When I click on the desktop icon, nothing happens. I am currently running QGIS 1.7.4 with no problems and the installs of previous ...
2
votes
2answers
2k views

How to access attribute data type in QGIS?

I've been developing a plugin on QGIS platform using PyQGIS. So far plugin does the following: You can select any feature of the already loaded vector layer in QGIS. After selection, plugin displays ...
2
votes
3answers
1k views

Transforming a polygon to ESRI shapefile?

First, apologies - I am a complete newb at this stuff and don't know what I don't know. I may use incorrect language. Essentially, I want to convert the shapes in a Microsoft Visio diagram into a ...
2
votes
1answer
245 views

how to extract overlap from non-dissolved buffer zones in qgis 1.7.4

I have a shapefile with the inventory of all limetree in a region. I made a buffer around each tree. So, the place where buffers overlap each other is the best place to put beehives. Is there a way ...
2
votes
1answer
552 views

How to transpose the lat/lon coordinates of a shapefile?

I need X to be Y and Y to be X (switching lat/long) within the polygon shapefile. If it were a point shapefile I know I could simply reverse the lat/long or x/y parameter and import from a table. I'm ...
2
votes
3answers
903 views

Cut many lines with many polygons: Too much for my CPU/RAM?

I have a line-shp (80mb) and a polygon-shp (5mb) and want to intersect them. In result, the lines (contours) should be cut by the polygons. After using one of the tools "Vector -> Geoprocessing ...
2
votes
2answers
361 views

How to import .dbf with long text values?

I'm trying to join a .dbf I made in LibreOffice with a shapefile. The .dbf contains ~10 columns, three of which have a large amount of text (~100 words). When I import the .dbf into QGIS, all ...
2
votes
5answers
2k views

Where to find qgsaffine in the menu?

I installed the plugin qgsaffine but cannot find the entry in the menu bar. Where do I find this. Can anyone here help me with this? best regards desputin
2
votes
2answers
1k views

QGIS is not able to find GRASS. Choose the path of installation folder of GRASS

I've downloaded and then correctly installed QGIS 1.7.4 for windows (Win 7 64bit is my version) in C:\Programs\Quantum GIS. But everytime I start QGIS this popup appear: "QGIS is not able to find the ...
2
votes
1answer
287 views

How to port QGIS C++ plugins to other QGIS installations?

I developed a C++ plugin for QGIS using VC++ express 2008 and a QGIS dev release (1.9.90 alpha), my plugin works fine on this release and now I want to port it to other QGIS installations, so I copied ...
2
votes
1answer
2k views

How to correctly specify coordinate system?

Using QGIS v. 1.9 (1.7 does not seem to be available for Ubuntu Linux 12.04), do the following: Create new project, specify coordinate system by clicking on button in bottom right hand corner, ...
2
votes
1answer
4k views

How to add points to a point vector layer - QGIS

I have a point layer with multiple data points in QGIS, but I want to add some extra data points to it and adjust some info that we missed because the ground was wet and we needed to go around it. I ...
2
votes
3answers
2k views

How to use SRTM30 Plus data with QGIS or other GIS tool?

I am trying to access the new Bathymetry data published here: http://topex.ucsd.edu/WWW_html/srtm30_plus.html Is there a way QGIS or similar tool can read these files. Nothing seems to be working, ...
2
votes
3answers
1k views

How to search feature in Qgis?

How is it possible to search feature on Qgis? I have lots of points with Id. Is is possible to search points using ID? Update: I'm looking for a solution that centers the map to that point.
2
votes
2answers
3k views

How to exclude missing values from raster layer?

In my raster layers the value -999 means "missing". Those points completely mess up any colormap in qgis because qgis treats them as normal values and includes them in the classification. I would ...
2
votes
0answers
542 views

Trouble with Python plugins on QGIS [closed]

This question has been bugging me for a while now, and I still haven't managed to solve it, so I'm giving it another go, hopefully someone may help me out. I've been having problems loading several ...
2
votes
2answers
440 views

Error when setting projection of a tif file in QGIS. Any ideas to solve this? [closed]

I get this error when trying to define a projection for a tif file in QGIS: ERROR 1: Too many points (3249 out of 3249) failed to transform, unable to compute output bounds. How do i work this out? ...
2
votes
1answer
1k views

Transform polygon to equivalent circle, QGis

I have a polygon and I'd like to find the radius of an equivalent circle from a particular point within the polygon. The polygon would have a large (infinite) number of points evenly distributed ...
1
vote
0answers
16 views

Update WFS Layer with QGIS - Commit errors

In QGis: Importing WFS Layer from Server, changing Attributes, trying to save. I get Commit errors: Could not commit changes to layer ah_neu:mylayer. The geoservers logfile says: 2015-01-21 ...
1
vote
3answers
45 views

Can't use Raster Calculator with two different rasters

So, I have several maps like this one: And with the proximity tool and a coastline shapefile I made this output, representing the distance to shoreline: Now, I want to combine both using the ...
1
vote
1answer
32 views

Where do I find the legend for netCDF files in QGIS?

I'm using QGIS to make maps of the maize, rice and wheat cultivated area at global level. I found these great netCDF files: http://www.geog.mcgill.ca/landuse/pub/Data/175crops2000/NetCDF/ Here's an ...
1
vote
1answer
85 views

Why is the QGIS map composer grid showing unreasonable lat/lon?

I need to print a map with coordinates in the format of Degree, Minute and second. CRS is set to WGS 84 (EPSG 3857) for both layers and on the project properties it is set to enable transformation on ...
1
vote
1answer
52 views

Adding items to DEM in QGIS

Working with QGIS and Grass I would like to produce a ZTV. I have the bare land DEM happily ready to go but would like to add buildings and woodland to the calculation. Can anyone please point me in ...