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

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Interpreting the geom_way in the table created using osm2po [duplicate]

Possible Duplicate: Issues while plotting the results of pgRouting shortest path I am trying to actually figure out what this column exactly represents and how to use that in my case. I ...
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0answers
47 views

QGIS DBManager error when selecting a feature [duplicate]

Possible Duplicate: Why does my PostGIS query fail with “current transaction is aborted” having loaded a PostGIS layer on the QGIS canvas using the DBManager plugin, I am unable to select ...
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0answers
181 views

QGIS 1.7.4 crashes when using interpolation tool

I am currently using QGIS with Lidar data to produce hillshade images. I have split the lidar data in 20 files (31kb). Some of the files are working some are not. I have checked the files xyz are ...
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217 views

Installation problem with XY Tools [duplicate]

Possible Duplicate: How to install Pyton libs for XYtools to read Excel files I was using XY Tools plug-in for QGIS that converts Excel files into attribute table and shape files etc, but ...
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0answers
347 views

error while trying to compile quantum gis: unresolved external symbol class QgsSearchTreeNode

i'm trying to compile the quantum gis sources code following the step by step how to compile guide, but i'm facing an error when code is linked. I'm compiling in Windows 7 x64 in Microsoft Visual ...
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45 views

How to load GeoJSON files directly onto QGIS? [duplicate]

Possible Duplicate: Plugin or script to get QGIS to display geoJSON in a layer Is there a way to do this? Or is there a way i can put it onto PostGIS and then load it onto QGIS? I actually ...
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384 views

how to create shape file table from text file in QGis python

I have a text file with all field information how can create new polygon shape file table with the text file.. text file having following content.. NAME LAYER GM_TYPE KML_FOLDER ID PERIMETER ...
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78 views

Is there a plugin that collects and allows you to just “turn on” open layers?

I'm thinking on a similar approach as gapminder.org, only that this plugin would contain GIS-data, not only statistics. I'm specifically interested in if there is a plugin like this for QGIS. If ...
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142 views

Polygon symmetry detection

I was wondering if there was any way to create main axis (axis of symmetry) lines for polygons. I have polygons that represents buildings. I will want to find main axes (axis of symmetry) for those ...
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94 views

How to maintain schema when copying feature from layer 1 to layer 2, where both layers have same schema?

If I load two unique layers, wherein each layer contains unique data, but both layers share the exact same schema, why is it when I copy a feature from layer 1, and paste it into layer 2, the ...
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1answer
948 views

How does “Show only visible features” work in Map Composer?

If I tick show only visible, I get no features. I have created an attribute table in the Map Composer in QGIS trunk QGIS version 1.9.90-Alpha QGIS code revision 4d6cc6d I note recent feature update ...
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143 views

qgis rgb raster layer: min/max-values definied by user not working?

I tried several times to define the min/max-values for the rgb-display under properties>style: Benutzer min/max-Werte (user min/max-values) but it is not working. By chance it worked once but now it ...
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609 views

SDA4PP not found? How to do Kriging in QGIS?

I need to make kriging analysis in QGIS (v1.7.4). I found out, that it should be a part of SDA4PP plugin, but I just couldn't find it in any repository (even third party). It looks, like it just ...
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0answers
225 views

Manifold 'Link drawing to query' - can I do this in QGIS?

Manifold GIS allows the creation of dynamic drawings linked to queries. Unfortunately I do not have access to Manifold as my employer refuses to pay for it, so am currently investigating ...
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437 views

How to do Kriging using SDA4PP in QGIS?

I am trying to do kriging using SDA4PP. I have added a delimitted text layer and wish to krige that. When I try I get an error message from SDA4PP as follows... This tool requires at least one ...
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1answer
257 views

Importing a PostGIS and a Delimited Text layer in QGIS, not overlapping

I'm a beginner in QGIS, and I have a PostGIS database and a CSV file I would like to visualize. I followed the instructions in this question and the answers, but it doesn't work for me, my two layers ...
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339 views

How do you convert a bounding box into the canvas CRS?

I need to convert the pixel coordinates of a bounding box to the same CRS being used by an existing layer. Here's the relevant code so far: # First, get the layer-coords version of the bounding box: ...
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1answer
9k views

How to fix Qtcore4.dll can't find procedure entry point? [duplicate]

Possible Duplicate: How to fix QGIS error “Entry Point could not be located”? I am working with QGIS, python2.5 and pyqt4 for py2.5. My system variables are as follows: ...
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1answer
474 views

How to refresh QgsMapcanvas?

I am using Qgis 1.7 and I want to refresh the mapcanvas so I am using refresh() function of QgsMapcanvas class and Nothing is happening to the Map Canvas. I am using Python for customizing
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0answers
158 views

Can I overlay layers in Dealul Piscului 1970 and WGS84 in QGIS?

I have a 10 Gb ECW file (mosaic of a whole county) that is in Oblique Stereographic projection with Datum: Dealul Piscului 1970. The problem was that no matter the Default CRS for new project was, ...
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455 views

QGIS Layer Properties Field Tab

When I setup my layer properties I selected some of the attributes to be hidden on the Fields tab. I would like to change the EDIT WIDGET from hidden to a different function however some of them are ...
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1answer
324 views

libnetcdf.so.4 error while installing qgis 1.6.0

I am trying to install Quantum GIS 1.6.0 from source on Ubuntu 10.10 64-bit OS. I have GRASS GIS 6.4.1svn installed on the machine. When I run 'make' I get the following error: [ 34%] Built target ...
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1answer
30 views

QGIS - View bathymetry info in the status bar

PolyGo suggested that I split my earlier twofold question into separate questions. So: I am new to QGIS or any GIS software so please forgive me if the answer is obvious to you. I wish to view the ...
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2answers
74 views

How to compute percent of a field

I have a layer with a column conaining population values. I want to write an expression to compute in a new field the percentage of population each polygon has in relation to the total population. I ...
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1answer
52 views

How to make river lines intact between confluences in QGIS?

I got a river shapefile below, and I found that there are many fragmental lines in this line shapefile, like, and, Most of these are located around the confluence(node), and how can I do to ...
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2answers
261 views

qgis 64 bit ODBC set up link to 32 bit Access on win7

I am trying to set up a an odbc link to access 2007 32 bit but not having any success. my system is a win7 pro 64 bit and I have qgis 64 bit installed.Here are the steps I have already tried. Set up ...
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2answers
320 views

Add Oracle Spatial Vector Layer with QGIS 2.0 on Mac OSx

I installed version 2.0 using the recommended mac installer (http://www.kyngchaos.com/software/qgis), and the installation went fine, but there is no option to add an oracle spatial layer (not in the ...
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1answer
99 views

Find directly joined neighbour points using a different line layer in QGIS

I have two layers of data: A set of points showing every significant point on the UK rail network (Network Rail Stanoxes). These are a mixture of stations, junctions, timing points and signals. An ...
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2answers
261 views

How to use centroid option in Field Calculator in QGis

I want to use Centroid option in field calculator in QGis .How to access it?
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1answer
81 views

How to find obsolete plugin?

I just installed a brand new copy of QGIS 1.8 Lisboa and all of the associated software on a Windows Vista PC using the Windows Osgeo4W QGIS installer, and I get this message: "The Plugin Installer ...
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1answer
175 views

Is there any python function to rotate map layers?

Is there any python function allowing a user to rotate map layers in the map canvas. If so, could you please point this out for me? I want to rotate a map layer, using a factor of rotation in ...
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1answer
3k views

Why can't I right click -> toggle editing Quantum GIS [closed]

I would like to delete multiple polygons at once: How to delete multiple selected polygons at once? Why can't I right click -> toggle editing Quantum GIS [ it is grayed out] ? My layer is polygon ...
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3answers
695 views

How to rasterize a vector map?

I am looking for a way to create a raster grid from a vector map. I have a map consisting of shapefiles which I want to export as a raster with UTM coordinates. I was thinking of something using the ...
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2answers
62 views

Is there a way to “zoom to feature” in QGIS?

I am the GIS Director of a city public works. I have a shapefile that I created of points on each structure and address in the city. We have been working in ArcMap Desktop for 6 or 7 years and depend ...
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1answer
353 views

How to convert a finished project in QGIS to PDF

I have finished my project and need to convert it into a PDF file. How can I do it?
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3answers
175 views

Any updates on problems with loading ESRI FileGDBs in QGIS 2.2?

There are many posts in different forums about people having trouble reading File GDBs in QGIS 2.2, but no real solutions. Is there any word on a resolution to this problem? I am using QGIS 2.2 ...
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1answer
540 views

How can I create a line with three points with Python in QGIS?

I'm new to Python and I'm having some dificulties. I want to create a simple layer with a line in the console of QGIS with Python. How can I do that?
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2answers
469 views

how to create gis like Uster?

I downloaded qgis, geoserver, openlayers, ext, geoext, qgis-web-client and osgeo. And i have map shape files. i would like create website like this site. i need help. can you send tutorial links thank ...
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3answers
7k views

How to publish my map on the web? [closed]

I want to publish my map is created in QGIS 1.7.4 version on to the web.Can u pls suggest me how to publish the map with proper documentaion and screen shots if possible?
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1answer
75 views

generate massive shapefiles

I have a shapefile with 1475 records, and I want to generate a shapefile for each record. What can I do to generate them avoiding selecting and exporting each record to do that?
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2answers
140 views

Converting .kml to different projection in qgis not working

I have run into a slight problem it would seem. Yesterday I downloaded qgis in the hope that it could convert a .kml overlay of some administrative boundaries from EPSG:3857 (Google maps) to ...
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2answers
233 views

Select / Deselect and Identify Features in QGIS

Sorry if this is all a bit 101, but I'm new to QGIS. I basically have a large Arc project that I can access in QGIS for reference, so will only really be using it to identify features. For example to ...
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1answer
135 views

How to edit a group of selected features in QGIS?

I am dealing with a large number of planning units across a very large study area. I am selecting a number of features using the advanced search in the attribute table, and would like to edit them ...
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1answer
70 views

QGIS still not rendering WMS layers

Similar to Neil's question of March 8th 2013: QGIS not rendering WMS layers I can down load the BGS 1:50K bedrock and superficial deposits maps OK, but they don't render except at scales greater ...
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1answer
41 views

Change Case in .dbf file QGIS

Asked another question below and this will develop on from this. The Bedrock 625K BGS mapping is all in UPPERCASE. It looks clumsey and wrong in the legend. I wish to change it to Sentence Case. I ...
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2answers
79 views

Calculate length of line across zones with at least m accuracy

I have created lines between multiple points that are across MGA 54 and 55S (EPSG 28355). I am trying to calculate the distance between points but different methods give different answers (~1km ...
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1answer
64 views

How to view attribute information in shapefile using QGIS? [closed]

I have a polygon shapefile (*.shp) and want to view its attribute data. How can I do this using QGIS?
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2answers
74 views

How to find polygons with area size between 300 and 500?

I have bunch of polyygons, all with different area-size. I want to find polygons with areasize between 300-500. Normally I would pick out everyone above 300 (query1) and then commit a new query on ...
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1answer
133 views

add wkt representation of the geometry as field in qgis

I have the shapefile of boundaries loaded in qgis. I want to add a field in the file which is WKT representation of the feature. Update As Nathan W answered I used geomToWKT( $geometry ) and got ...
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4answers
178 views

Buffer in QGIS/R is 650-670 m wide instead of 500 m

I am trying to make a 500 m buffer for my polyline layer. Unexpectedly, I receive buffer varying from 650 to 670 m, depending on location. As many resources recommend to use UTM before making a ...