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

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254 views

how to make transparent layers with Google earth layer?

with your help, i solved most of my problems, but here is another one - i guess, a smaller issue... I managed to get Google earth layer, but when I add my GPS gpx files, are all hidden under the ...
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2answers
1k views

QGIS conversion of Microstation .DGN to .SHP?

I'm attempting to convert a .dgn file to .shp using QGIS. I'm reading that support is only provided for v7 microstation files, is this still the case? I've been using ogr2ogr -f "ESRI Shapefile" ...
3
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2answers
380 views

how to add orthophoto layer in qgis

I am not an advanced user, but I try to be oneday :) here is my issue: I have tracks (just waypoints) from my GPS in gpx format. I also have orthophoto pictures in tif format, that I would like to ...
0
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1answer
31 views

Is the Qspatialite 6.0.8 font for SQL free text supposed to be huge?

A week ago I upgraded my Qspatialite plugin in QGIS 1.8, which I frequently use in parallel with Spatialite_GUI, to get the best of both Sqlite worlds. I immediately noticed that my SQL free text ...
6
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3answers
2k views

How to digitize a raster automatically

I have a raster (.sid extension) file. I want to digitize roads automatically in ArcMap, QGIS..etc. Digitizing by hand would be too time consuming. How can i do this ? Thanks
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2answers
295 views

How to create a MultiLineString feature with a postgis layer in QGIS

I have troubles handling with MultiLineStrings in QGIS. I added the table where I defined a column as geometry(MultiLineString, 31468) as a postgis layer in QGIS. Now I want to create features with ...
4
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1answer
82 views

Automatic selection of legend object in QGIS

I'am using the Corine Land Cover data for a projet. There is around 40 types of land use in this database. In my print composer with my scale (1:20 000) I neve have more than 10 type of land use. I ...
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1answer
165 views

Is it possible to rotate labels in Print Composer?

Is it possible to rotate a label in Print Composer (QGIS 1.8)? Thx.
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1answer
67 views

How do I delete multiple data points from a .csv file through QGIS?

I have a .csv file with points in North America, but I only want to focus on a section through North America that excludes places such as Alaska and Greenland. I've selected the points below, but ...
2
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2answers
725 views

QGIS crashes when using dxf to shp converter

this is my first question on Stackexchange. I use a GPS to capture data in .dxf, manipulate it in a CAD program that I know how to use, then the dxf2shp converter (I think Python is mentioned) to let ...
3
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2answers
211 views

How to show just some labels based on feature intersection of layers?

I'm trying to use "expression based" labeling in QGIS, but I'm stuck with a particular case. I managed to use it for a project with the help of other topics and FAQ but I'm not skilled enough to ...
2
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1answer
198 views

Adding temporary graphic or vector layer to QGIS to replace the slow select feature method

I have a custom QGIS 1.9 dev (so 2.0 I guess) plugin which collects and displays a list of polygons in a QTreeWidget. I would like to select a list item and it immediately display a highlighted ...
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1answer
187 views

how to export mdb to dgn file in qgis

I am having an (.mdb) file .I want to export this file to (.dgn) format .How can i do this in Qgis ? Is there any plugin available ?
0
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1answer
159 views

How to solve sqlite_rtree_geometry_callback error?

I have just installed qgis 1.8 and it show error message the procedure entry point sqlite3_rtree_geometry_callback could not be located in the dynamic link library sqlite3.dll How to fix ...
3
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1answer
180 views

Bar graph - cartodiagram in QGIS

Can I create a cartodiagram in QGIS 1.7.3? I need one bar graph in every territorial unit of one layer. It must vizualize organization on X and number of research in one organisation. Is it possible? ...
1
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1answer
172 views

QGIS Regex substring for Labelling

I'm trying to plot a series of contours in QGIS based on dxf data exported from some specialised mining software. The attirbute output is pretty ugly and merges a few fields together. DXFName=C$5 ...
1
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1answer
275 views

Problem loading PyQGIS

There is a problem on my system when starting QGIS. I get this error. I am running openSuse Tumbleweed 64bit and openSuse 12.3 64bit. Same problem on both systems. Couldn't load PyQGIS. Python ...
0
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1answer
136 views

Importing UK Land Registry data into Quantum GIS

We have purchased data from the UK Land Registry to import into Quantum GIS however when I do so using the Coordinate referencing systems of OSGB 36/ British National Grid (EPSG:27700) the data ...
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0answers
127 views

Label problem on QGIS

It's my first question here so, I hope not to be too bad at it. I'm using QGIS 1.9.0-Master on mac osx. I think I have some question and some bug issues, so also posted a message on ...
1
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1answer
241 views

Qgis - raster values become integer when Polygonizing

When using the GDAL plugin, "Polygonize (raster to vector)" any values in the resulting vector layer is truncated to integer. I have a raster showing windspeeds in squares of 500*500 meters, in the ...
0
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1answer
122 views

With QGIS, how can I create a layer from a .csv file?

I have a .csv file with ~16k points with lat and long to plot onto a map. I'm completely new to both QGIS and GIS in general and have got to a point where I have downloaded the OpenLayers and ...
1
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1answer
180 views

Can't view PostGIS rasters after changing schemas

I have loaded a few rasters into the Public schema of a PostGIS 2.0 database. Using the db manager in QGIS 1.8.0 I can add the rasters to the map canvas. After moving the rasters to another schema in ...
2
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1answer
103 views

Changing projection for field calculator

I've just succeeded in getting the area of a polygon using field calculator. The polygon was drawn on a Google hybrid aerial photo. There are no units given in the calculation and I assume the area ...
16
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1answer
611 views

How to create a QGIS Installer for Windows with GUI customization?

I'm trying to build a custom QGIS installer for Windows with a stripped down GUI. I customized the GUI using the customization function of QGis and saved it as a .ini file. The question now is: How ...
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1answer
151 views

Unable to create shapefile in QGIS

I am very new to QGIS and although I've been able to download the software and get aerial imagery using the plugins menu, I'm getting nowhere with creating a shapefile that I can use to draw a polygon ...
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0answers
153 views

Covisibility with QGIS/GRASS : r.los issue

I try to use r.los for a viewshed calculation. I specify the dem (Aster DEM clipped on a 2km*2km region). I specify x and y coordinates and run the command. Nothing append. I waited for 20 minutes ...
8
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1answer
255 views

How does Spatialite handle concurrent access?

I understand that Spatialite is meant to be used by a single user/machine at a time. However if the data is stored on server, there is no guarantee that someone on another machine will not also open ...
2
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1answer
144 views

Plugin error in Qgis

I just now downloaded a plugin named "XY tools"from fetch plugins option . I am a user of Qgis v 1.9.0.It shows me the following error: An error has occured while executing Python code: Traceback ...
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2answers
74 views

Where to find 'Identify feature' tool in QGIS?

It used to be an arrow with i. Now I have different version, I have gone through all the buttons and panels but cannot find it!
2
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1answer
139 views

How to reproject vector data?

I am evaluating QGIS with a view to visualize and manage geological exploration data. The information is currently stored in different local coordinate systems that I am looking to overlay with ...
0
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1answer
608 views

OS Vectormap GML files into PostGIS

I am having difficulty in efficiently dealing with OS Vectormap data that comes in GML format. In the past I used the Plugin for QGIS (OS GML Tools) to batch convert folders of compressed GML (.GZ) ...
1
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1answer
249 views

clip one layer with the current map layers

I work in a little companie where the main goal of employees in GIS is to have a quick view of the issues on a study area. It would be very useful to have a tool wich clip all the layers of the ...
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0answers
74 views

Merging US counties in QGIS?

I'm doing research on US cotton price fluctuations from 1877-1930. Here's the problem: my data is county-level, but county borders changed from 1877 to 1930! To solve this, I plan to "aggregate ...
2
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2answers
112 views

How to hand over polygon attribute to new point while digitizing?

My task is to work with bird observation data in an area, that is divided into zones as different polygons (A1, A2, etc.). I have the hand-written lists of observations and want to bring all entries ...
2
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2answers
1k views

Are there only two methods of interpolation in QGIS?

I did recently a map of maximum temperature for specific area in Quantum GIS 1.8.0 and its interpolation. However, I was wondering if there are only two method of interpolation, apart from ...
2
votes
2answers
225 views

Why does the buffer take up whole screen?

I am trying to create buffers around the Hurricane Sandy path I created in QGIS (points are lat/long). I have both points from each day she was tracted and the line I created from it with Points2One. ...
3
votes
1answer
248 views

Why can't I share project files with another QGIS user?

I am working with another QGIS user at a separate location and we want to share the projects that I have already created using QGIS. However, the other user is unable to open the project files in ...
0
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1answer
461 views

QGIS very slow I don't know what to do

I'm new in QGis and I already have a big Problem with the speed of this Program. Till now I have only worked with ArcGIS and have never had a problem like this. Everytime I start QGIS and add Layers ...
0
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2answers
231 views

how to load gps information in my map and track way points?

i am using QGIS 1.8 in ubuntu 12.04 . i am working with ROBOTIC OPERATING SYSTEM(ROS) and QGIS simultaneously . My ROS system is connected to LIDAR(sensors) that will publish gps message so i could ...
2
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2answers
233 views

How to add non spatial sqlite table to map using python in qgis?

Is it possible to load pure sqlite 2.0 (without spatial extension) table into qgis using python? I would like to get the same result as in the case of using Add Vector Layer -> All files. I have ...
1
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3answers
4k views

Export shapefile to KML for Google Earth - using QGIS

I am a real beginner with QGIS. I have shape files of my study site. I would like to have the nice google earth background. I would like to be able to see my files in Google earth, then I can zoom ...
5
votes
3answers
432 views

Very poor performance of QGIS and PostGIS2. User error or feature?

I have a large table in Postgis2. It has >500 million polygon, line and point features all happily living in there and the table performs brilliantly in other GIS. I am now trying to just add that ...
0
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1answer
80 views

I cannot start up QGIS and get an error message [duplicate]

When I start up my QGIS, the following appears on the screen and it closes down. Please help me; I really need my files that are there and do my work as well. The message says: The ordinal 284 could ...
5
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3answers
260 views

Should We Be Using a GIS?

I'm actually a graphic designer - the manufacturing company I work for wants to develop a map with layers for Regional Sales Managers territories, Internal Sales Associates territories, Local Rep ...
2
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0answers
245 views

Plotting X, Y coordinates generated from MySQL database in QGIS

Currently running QGIS 1.8.0 on Mac OS X 10.8.4. I can plot points on a map using the "Add delimited text layer" plugin to get x-y coordinates from a text file. However, I'd like to be able to ...
1
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1answer
323 views

QGIS Time Manager with Multiple Vector Layers

I have to animate a map of Europe (31 countries) which contains three separate vector layers: The first layer is a simple map (with just the political boundaries) of Europe with 31 countries (each ...
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0answers
404 views

Problem compiling UI file generated by QGIS Plugin Buidler

I have used the plugin builder QGIS 1.8 to create an empty plugin. The next step is to compile the ui file using pyuic. pyuic.py runs but halts at the line with from PYQt4 import QTCore and an error ...
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3answers
507 views

Can I use Openlayers Plugin with a different Datum/Projection?

There is probably already a post for my problem, but after long searching, I could not find a solution for my issue. I am working with QGIS und I am using the following projection/datum: MGI / ...
0
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1answer
58 views

HELP with installing QGIS 1.7.3 for a mac

Could someone please help me install QGIS 1.7.3 for a Mac and possibly give step by step instructions? I have already installed QGIS 1.8 for a Mac, however I have heard that the 1.7.3 will run ...
3
votes
1answer
125 views

QGIS - How to add a geometry to an existing feature that has NULL geometry?

I have a PostGIS table with some polygons having NULL geometry. The rows are correctly displayed in the attribute table in QGIS. As expected, there is no geometry draw in QGIS. My question is how can ...