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

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0
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0answers
39 views

Only one row displayed when opening attribut table

When running the example data for Alaska, the attribute table view for Lakes only shows the first row. All lakes are displayed in the map view.
0
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1answer
252 views

How to debug QGIS installation problems on XP? [closed]

I'm installing Qgis (Standalone 1.8) on all the PCs of the town planning office where I work. All good for 4 computers, on the fifth installation does not work. Computers have all XP with SP3. In ...
4
votes
2answers
1k views

Create custom projection using either QGIS (or ArcGIS)?

I have searched for an answer to this but don't see anything relating to what I am trying to do. What I have are a series of Geographic Coordinates, Latitude, Longitude, Ellipsoid heights. What I ...
1
vote
1answer
135 views

QGIS python plugin, segmentation fault, what can I do?

I'm trying to write a python plugin to create an input file for an urban climate model out of three shape files. Unfortunatelly QGIS closes when I try to load the plugin. When I start QGIS from the ...
2
votes
2answers
1k views

How to create a map with states by attribute value?

I'm using Qgis, but I am quite familiar with R and python. So I could use any of these. I want a map of mexico but want to color the stats according to a certain variable. It goes from 0 to 100. So ...
2
votes
2answers
335 views

How to identify image footprints of an aerial photograph

I need a tool that will take aerial images with Lat, Long, and Alt in their EXIF data and produce foot prints of the images. We need to verify that the images cover the photographed area with proper ...
10
votes
2answers
4k views

How to check Topology in QGIS?

I have two Shapefiles with Polygons ( City and Forerst) Is there a Plugin who is able check the topology (QGIS)? Like "Knots do not overlap" or something like that? I dont want that they overlap. ...
6
votes
3answers
2k views

Loading geotiffs into PostGIS using raster2pgsql

I have an issue with loading some Ordnance Survey raster data into PostGIS. I have been using the following raster2pgsql command to load a tif that I have placed in my C:\Program ...
3
votes
2answers
572 views

How to densify a polyline according to a specific length? [duplicate]

Possible Duplicate: Add vertices to lines I am using QGis 1.8.0 I would like to densify a polilyne according to a particular length of segment (ex. 200 m). I know it is possible with other ...
5
votes
1answer
517 views

Create point between two points with given distance or length

What I have: Coordinates of Point A and Point C and therefore vector and azimuth from A to C What I want: Coordinates of Point B (between A and C) with a distance from A to B of 35.2 meters. ...
3
votes
2answers
315 views

Looking for qml specification

Where I can find qml specification which is used for store symbology information in QGIS? Try to googe it - no result.
0
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1answer
691 views

Ogr2Ogr doesn't work with QGIS 1.8

I'm trying to use Ogr2Ogr.exe to import some shapefiles. It came installed with QGIS 1.8. When I try and run it, i get the following error: C:\Program Files (x86)\Quantum GIS Lisboa\bin>ogr2ogr ...
6
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2answers
6k views

How do I change the data type in attribute table in QGIS

I have county data in which the FIPs (actually State FIPS and County FIPS combined). I have data imported as CSV with the sames FIPS data titled STCounty. However, the shapefile FIPS is listed as a ...
3
votes
1answer
2k views

What's the proper format for WKT linestrings when importing into QGIS?

I'm trying to run the following test CSV through the Delimited Text plugin as WKT data: oid,Line 1,LINESTRING((45.554194 -122.686101, 45.433001 -122.762632)) 2,LINESTRING((45.432505 -122.598327, ...
2
votes
1answer
183 views

How can I add individual geoprocessing tool, for e.g. buffer onto the toolbar in qgis?

I am no programmer so I do not understand how to create a plugin to add a button to the toolbar. Is there another simpler way to do so? I only need a few tools from the ftools suite and do not want ...
1
vote
2answers
176 views

How to apply v.transform on a set of vector layers (GRASS 6.4)?

I have 64 vector layers, all of them must be warped using the v.transform module; the pointsfile is the same for all vectors. How can I apply the transformation recursively to all layers? I'm not ...
1
vote
0answers
91 views

Categorized Style : showing all possible values, not just the ones in use

I am new to QGIS and experimenting before rolling this out to my colleagues. I have a shapefile with some codes, and i have a csv with those codes and other information that i need. I have joined ...
3
votes
1answer
213 views

How can I preserve date field format when importing to QGIS?

I have a slight learning curve working here, is there a work around to importing spread sheet data without changing the type of data in the fields? i am importing some water test data along the rio ...
1
vote
0answers
331 views

Why won't this PostGIS query display in QGIS

I am having trouble rendering the following PostGIS query in qgis1.803. SELECT s.musym, st_intersection(s.the_geom,f.the_geom) as geo, nextval('"soilsplittersequence"'::regclass) as k From ...
1
vote
1answer
349 views

Is there a way of viewing a photo has a point tag from Photo2shape in QGIS?

Is there a way to view images (photos) that have location point from Photo2shape by clicking on the point in QGIS?
2
votes
1answer
337 views

Is it possible to add rings using other polygons?

I would like to "Add Rings" but using other polygons. Example: https://www.dropbox.com/s/ue1k3b646ivqedo/holes.JPG I would like to delete the two selected polygons and create holes under them in the ...
1
vote
1answer
680 views

how to get the projection from a vectorlayer in qgis?

Hi I am trying to set the projection on a raster to match that of a vector point layer. Thus I need to findout what is the projection of a give layer, to use it in the GDAL.Dataset.SetProjection() so ...
0
votes
1answer
334 views

Polygonizer plugin halts in Windows

I've had some success and some problems using the Polygonizer plugin in the past. I'm using Polygonizer 2.1 in QGIS 1.8 on Windows 7. I'm aware there are sometimes problems using Polygonizer in ...
2
votes
2answers
533 views

How do I import specific Coordinates from Namibia in QGis?

I have a map here with Coordinates from the Schwarzeck Map Datum Format 1903. They have the following format e.g.: y: 41 944,31 x:363 810,71 I want these point to be pictured in QGis... how is it ...
6
votes
1answer
596 views

Clean small artefacts from polygon shapefile

With some success, I've been generalising and cleaning Ordnance Survey OpenData VectorMap District woodland polygon shapefiles to make them fit for mid-scale mapping. However, the resulting ...
1
vote
1answer
880 views

Change coordinates of a polygon

I wanted to know whether it is possible to change the coordinates of a Polygon by typing them in. I don't want to have to manually drag them into the right position.
15
votes
5answers
16k views

How do I create point features with exact coordinates?

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: -Add point, type ...
3
votes
2answers
2k views

Adding georeferencing data into tiff image

I want to create a georeferenced .tiff file from a .png file. So I convert the .png into a normal .tiff file using the following command line : convert image.png image.tiff Here, all works fine, I ...
2
votes
1answer
540 views

QGIS identify features button issue

Is there anyway to get the Identify Features button in QGIS to automatically select a layer and provide the information without having to highlight it first in the layers TOC? MapInfo and ArcGIS ...
2
votes
1answer
1k views

How to save a vector layer from QGIS to Sql Server 2008 or 2012?

using QGIS, i've loaded up some administrative boundary data of New Zealand. I wish to now import this vector data from QGIS into my Sql Server 2012. Is there any way to do this with QGIS ...
1
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0answers
332 views

QGIS: opening a shapefile without an exclusive file lock [closed]

UPDATE: I did some analysis of what happens with the locking and it looks like QGIS doesn't use an exclusive lock. It just requires (non-exclusive?) write lock to the file. So this C# code fails: ...
5
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2answers
808 views

Where can I find documentation on QGIS C++ Plugin Development?

Is external C++ plug-in support available for QGIS? I'm having a really hard time getting started here. I followed the doc here: ...
1
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0answers
84 views

Why does Rotate Point Symbols tool not work on QGIS 1.7.4?

I'm having trouble with Rotate Point Symbols tool on QGIS 1.7.4, installed via the standalone installer. It just doesn't work. I can see the button on the Advanced Editing toolbar and in Configure ...
12
votes
2answers
567 views

Need a spatial database that can be used by QGIS and R

I'm quite new to QGIS and I'm searching for a simple way to create a Database that allows me to use the tables in QGIS and R. I have a lot of data stored in Excel spreadsheets wich will be used for ...
1
vote
1answer
453 views

Problem with Orfeo Toolbox integration in QGIS

I'm getting this error: OTB execution console output '"C:\OSGeo4W\bin\otbcli_MeanShiftSegmentation"' is not recognized as an internal or external command, operable program or batch file.
0
votes
2answers
455 views

How can I remove the menu bar in QGIS?

I want to create a clean user interface for my students to use QGIS. I tried to remove the menu bar using the customization in setting but I am not able to remove everything, e.g. Database, plugin, ...
2
votes
0answers
121 views

How can I trace an ANALYSIS_EXPORT error when building QGIS?

When building qgis1.8 using QT 4.7.4, I encountered the following error. I am unable to trace it: src/analysis/raster/qgsrastercalculator.h:31:24: error: variable ‘ANALYSIS_EXPORT ...
0
votes
1answer
89 views

QGIS exporting shapfile with proper projection

Can someone walk through the proper way to set a projection and export the shapefile so it will properly open up in another GIS program? I'm having trouble.
0
votes
1answer
118 views

Deleting large portions of shapefile

I'm have a huge shapefile and I'm trying to delete large portions of it. I can't seems to do it in the edit mode. Can someone please walk me through this process? I'm using QGIS 1.8.
4
votes
1answer
499 views

How to Create a raster layer from a numpy array using pyqgis?

I am working on a plugin for Qgis to calculate spatial Kernel density maps. I have all the calculations working, all I am missing is a way to turn a Numpy Array, with density values into a multiband ...
1
vote
0answers
59 views

Can't open exported data

I downloaded data here: https://nycopendata.socrata.com/dataset/Pavement-Edge/gydf-ksfn I opened this up in QGIS but when I export it I can't open it up in another GIS program called indiemapper. ...
2
votes
0answers
48 views

How to open GDB files using QGIS in a Mac? [duplicate]

Possible Duplicate: How to get “.GDB” Esri File Geodatabase in Qgis for MAC OSX 10.6? I have some data located here: ...
4
votes
1answer
853 views

Using QGIS calculate distance of point along a line

I have lots of points, and a road (lines) and I would like to calculate from point A to point B (the distance must route through the roads (lines). I found this QGIS calculate distance of point along ...
6
votes
4answers
298 views

How to avoid holes in polygons from lines?

I am trying to convert a dataset of lines that contains the coast of New Zealand into a big polygon. However using the vector -> geometry tools -> lines to polygon command in Quantum GIS results in a ...
8
votes
2answers
2k views

Converting ms-access database into easy to use spatial database

I've recently come into ownership of an MS-Access database (2007 accdb), which I want to be able to use in a GIS. I know a little bit about GIS (I've used QGIS and ArcGIS quite a bit) but very little ...
4
votes
3answers
3k views

Measuring the distance between lines and points in QGIS

Using QGIS - I have a vector of fault lines. I have point data in the form of a csv which I have also loaded into QGIS. I need to know how far each point is from the nearest fault line then enter ...
4
votes
1answer
616 views

Retrieve path and file name of current qgis project in python

Is there a way to get the path and the file name of the current project from a python script? I'm currently trying to develop a python plugin for qgis and I need to create a file with a similar name ...
3
votes
3answers
226 views

How to compare a set of images with a shapefile?

I have around 150 images (rasters), each one is just a map of certain "classes", e.g. pixel value 1=forest. I also have a shapefile that consists of roughly the same area as the 150 images constitute ...
1
vote
2answers
184 views

How to get only one feature from MySQL?

I would like to get only one feature from a MySQL database. What am I currently doing? I use the Add Vector Layer functionality in QGis to get the features (polygons) from the MySQL database. They ...
1
vote
1answer
227 views

How to change the path to the mysql socket in Quantum GIS?

I would like to use Mysql in QGIS. But when I want to create a new connection to the database (Add Vector Layer), I can't connect because QGIS is looking for /tmp/mysql.sock But I'm using XAMPP ...