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

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1answer
222 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
199 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
290 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
172 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
88 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
164 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
834 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
318 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
85 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
126 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 ...
3
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2answers
2k 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
255 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
344 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 ...
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1answer
661 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 ...
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2answers
266 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
votes
2answers
297 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 ...
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3answers
5k 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
538 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 ...
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1answer
91 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
272 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 ...
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0answers
322 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 ...
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1answer
427 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
553 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 ...
2
votes
3answers
648 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
72 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
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1answer
145 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 ...
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1answer
215 views

Mapquest in Qgis, why the blur?

I'm trying to do a simple map in Qgis using mapquest has background. I have read that and followed the scale values but even while using those, I get some bad blur on my map. I can't figure out to do ...
2
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0answers
240 views

Umlaute not displayed correctly when loading .mdb MS Access into QGIS (1.9.0-Master) with eVis

Good evening, I am loading an .mdb (MS Access 97 or 2003) to QGIS (1.9) via the eVis database conection. Connecting to the mdb, selecting a table and displaying it as a point-layer through the ...
4
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2answers
128 views

How to translate WIGeoEU projection from ArcGIS to Qgis?

I have a Layer with this projection in ArcGIS: ...
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2answers
456 views

How join attributes for point feature from nearest points in road network

I have two layers: 'linear' - road network and 'point' - points in each linear features intersections. Point layer have in attribute table name for each point features: A,B,C,D,E,F, etc. How add in ...
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1answer
287 views

Create new regions in layer by filling in between polylines on existing layer

I'm not sure if this is possible but would save me hours of work. I have a layer which consists of polylines. Most of those polylines bound areas; houses, roads, etc. Currently I am required to ...
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0answers
429 views

Setting up Pyscripter for QGIS dev

I have been trying to set up PyScripter so that I can make use of code completion for QGIS python code. So far, I have been unable to get things to work. PyScripter when set up as per instructions ...
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2answers
2k views

How does manual Label Placement in QGIS 1.9 work?

There are a bunch of questions here related to labeling in QGIS, but it's not clear which version they are referring to, and I know this is something that has changed recently. Hopefully it makes ...
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2answers
908 views

How to display arrows on pipes from upstream to downstream using QGIS?

I am trying to display arrows on pipes of a sewer network so their direction is from upstream to downstream edges of the pipes. I have managed to display those arrows on a polyline layer (which is ...
8
votes
1answer
338 views

How to automatically populate fields instantly?

I am looking to create an attribute table where the first field is a drop-down menu (I have achieved this by using the 'value map' edit widget), but I'm struggling to find a method for the next part; ...
5
votes
1answer
174 views

How does QGIS reproject data?

Projection systems are always troubling and I cam across and issue yesterday. I created a buffer and did a select by location using that buffer, however it was producing the wrong results. It would ...
5
votes
1answer
339 views

Can QGIS access cartodb tables via OGR?

I see that it is possible to access Google Fusion Tables in QGIS using OGRs Virtual Format layer. Shown here and details about the Google Fusion Table driver here. I was wondering whether something ...
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2answers
34 views

Help with 'Invert Overview' QGIS v1.9

I'm using the Atlas functionality in QGIS 1.9 to create a set of maps. So far, so good. But I want to be able to create a smaller map in the margin that acts as a map index. I've seen a blog post by ...
4
votes
2answers
497 views

Are there any COGO tools in QGIS 1.9+?

The "Azimuth and Distance" plugin does not appear to be maintained any longer, and has not been transitioned to the new QGIS 2.0 plugin repository. What are the current options for entering COGO in ...
2
votes
1answer
455 views

How to get a city road network as line segments?

I want to have road-network information of different cities(New York for example) in the format of line segments(i.e. every road is represented by segment(s)). I want this for experimental purposes in ...
2
votes
1answer
97 views

How to set default bad layers handler in the python plugin?

I am trying to write a python plugin for QGis. My python plugin will copy a template qgis project into data catalog with ESRI shapefiles. Because data catalogs can vary in its content there will be ...
2
votes
2answers
649 views

Manually Adding a Decimal Field to the Attributes Table

I am fairly new to QGIS and search as I might in the manual, training manuals and widely on the net I can't find an in-depth explanation of how to set up a Decimal Number (real) field in my attribute ...
7
votes
3answers
809 views

What are QGIS Arcpy Equivalent Functions for Update/Delete Row/Field?

I am trying to reprogram some scripts from arcpy to qgis (1.8 or 2.0) and there are some simple functions that I want to be able to redo but unfortunately documentation in qgis is lacking in certain ...
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0answers
260 views

Qgis libqgispython.so failed to load

I am using Qgis 1.8 and Python (on Ubuntu 12.10) for a couple of month now, but today i got suddenly the error Couldn't load Python support library: Cannot load library /usr/lib/qgispython: ...
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3answers
821 views

Why can't I open postgis layers in QGIS?

I've set up a table in PostGIS using OSM data (converted using osm2pgsql). I know this database is good, because I'm able to import it and work with it in TileMill, but whenever I try to interact with ...
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5answers
643 views

How can I count overlapping polygons, resulting in a new set of polygons?

I have 100 polygons in a GeoJSON file that partially overlap each other. I would like to produce 100 new polygons as follows: The area covered by any of the original 100. This is their union. The ...
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1answer
310 views

When is Qgis 1.9 being released

I've been working in the alpha of 1.9 for quite a while (because of doing bug reports) and I like it a lot. It's more than a year since 1.8 was released, so I wonder when 1.9 is expected out.
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0answers
112 views

QGIS - How to avoid -2147483648 value from imported CSV?

I am attempting to join a spreadsheet containing all the CIA Factbook Country Comparison Data (many columns) to the existing Natural Earth world countries shapefile. I followd the tutorial here, but ...
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0answers
116 views

QGIS layers not adding properly

using QGIS 1.8.0 lisboa on windows 7 pc adding vector layers and they are not adding properly they don't show up in the layers list but they are there when I happen to merge the the layers ...
1
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1answer
195 views

How to sum the values for bins with the same location?

I have two maps in csv form, each has a latitude, longitude, and value column. Since not all the positions in one map are in another map, is there any way in QGIS to display a new map which only shows ...