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

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1answer
221 views

Count the number of symbols in a 'new symbology' renderer from pyqgis

Background : I create a lot of symbology using 'saturation' ramps - for want of a better term, e.g. where the hue and value of each symbol stays the same, but the saturation changes. I couldn't figure ...
3
votes
3answers
2k views

How to sum raster image values with vector overlay

I'm new to this and haven't been able to figure out how to do this on my own. Here's what I want to do ... I have two files: a raster image of land use data and a vector-based shapefile of my ...
3
votes
2answers
1k views

QGIS How to use Query Builder with a Joined table

When I join a layer with another layer all the attributes are correctly displayed in the first layer. However when I use the Query builder (Layer - Query) and then use Zoom to layer, nothing is ...
0
votes
1answer
3k views

function, return, 'instancemethod' object has no attribute '__getitem__'

I'm still trying to write a python plugin to create an input file for an urban climate model out of three shape files. Now I stumbeled into another problem, that I think is an easy one, but I just ...
7
votes
1answer
329 views

How to migrate SVG-based styles for QGIS to other computers?

I'm working on a project that has involved creating many recolourable SVG icons and bringing them into QGIS. These are then used in layer symbologies, with these subsequent layer styles exported as ...
3
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3answers
8k views

Editing a KML file or converting KML to Editable format with attributes

I'm using QGIS. I'm trying to either edit a .kml file someone else created in Google Earth or convert it to another editable format (like a .shp file). I've read the following threads without really ...
3
votes
2answers
181 views

Can I Combine Areas in Quantum GIS?

I am working on a provincial annual health bulletin. I have a .shp file that has GIS data about the smallest divisions called "GN Area". Two or three GN Areas form one MOH area. I want to get the ...
1
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1answer
206 views

Analyse spatial data and extract results in tabular form in QGIS

I'm sorry if this question is badly framed, I only started with GIS and QGIS 2 days ago so I don't know any terminology yet - I'll try to explain as best I can. I have 2 layers in QGIS (1.8, on ...
4
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1answer
2k views

Installing QGIS on Mac OS 10.7. “The GDAL framework is required.”, and yet I have it

what did I miss? I'm trying to install QGIS on my MacBook (Mac OS 10.7). I'm following these instructions: https://sites.google.com/site/eospansite/qgis-installation/installing-qgis-1-6-on-macosx It ...
2
votes
1answer
943 views

How to fix The procedure entry point squlites3_open_v2 could not be located in the dynamic link library squlite3.dll? [duplicate]

Possible Duplicate: How to fix QGIS error “Entry Point could not be located”? I downloaded QGIS to my laptop (Window 7 64b) yesterday but when I click on the desktop logo I get the ...
1
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0answers
525 views

How to reproject a raster in QGIS? [closed]

I wanted to reproject raster file from UTM to decimal degree in QGIS version 1.7.1 or 1.8.0.. I could reproject one raster file before in QGIS Version 1.8.0. I have tried again, but now we cannot ...
13
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2answers
11k views

How to reproject a vector layer in QGIS?

I have some shape file which is in UTM. I wanted them to convert to Decimal Degrees in QGIS. Thanks.
2
votes
1answer
288 views

Hyperlinking to PostGIS Layers and Zip files with QGIS Actions

I previously asked a question about hyperlinking data in QGIS that gets loaded into QGIS (see post: Hyperlinking in QGIS - Add Data to current window). A user provided me with the code, which works ...
2
votes
0answers
60 views

QGis, add dialog and classes to plugin

what are the steps to add files that represent a uidialog(draw with QTDesigner), and add the necessary python class files, using the default makefile provided with qgis plugin builder? thanks,
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1answer
253 views

Imported points from csv file (latitude, latitude) don't show up in a post code shape file

I can produce a point vector layer by importing latitude and longitude info from a csv file in a new project. After saving this file as an ESRI shape file I can import it in a Postal Code shape file. ...
2
votes
1answer
252 views

Is it possible to rectify an aerial photo with known control points in 3d, in QGIS?

Bonjour, Peut-on avec Quantum GIS redresser une photo aérienne avec des points caractéristiques connus en 3D (XYZ) ? -- Translation: Hello, Is it possible to rectify an aerial photo with known ...
3
votes
1answer
632 views

Can I move points by editing x/y in attribute table?

Im new to QGIS and I just cannot figure out how to do this one hopefully simple thing: I have a bunch of points in shapefile and i need to move some of them around by hand / coordinates. I've ...
3
votes
1answer
911 views

Is it possible to change the plugin folder location?

Sorry for the vague header but i found no better one. This is the situation: I am teaching a GIS course in a local collage using QGIS (qgis4w). The way our lab pc's work is that they delete all added ...
6
votes
1answer
3k views

How do I edit shape file attribute tables so they all have the same information?

I am trying to merge several pipeline shapefiles using GEOMERGE but it cannot complete the function because they have different column definitions. So I need to edit the attribute tables so that ...
2
votes
1answer
919 views

When I finish drawing a polygon, it disappears again (although appearing in my attribute table)

I'm working with Quantum GIS at this moment. And as the title says, when I finish drawing a polygon, it disappears again. The new object does appear in my attribute table and in the legend/'filling of ...
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5answers
419 views

Error when starting up Postgis Manager plugin in Quantum GIS

I receive an python error when starting the postgis manager pluging in QGIS. This problem started when moving from QGIS 1.7.0 to QGIS 1.8.0 Lisboa. I reinstalled everything but that didin't fixed ...
0
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1answer
70 views

How to view the class files of QuantumGIS for further development?

I have been searching class files of QGIS for a while for customisation and edit it for a project..But I am unable to get or download the files...can anybody give some references if we can really view ...
12
votes
4answers
12k views

Feature comparison between QGIS and ArcGIS for Desktop [closed]

I am learning to use QGIS and ArcGIS for Desktop but I cannot find the differences between them. What are the differences between the capabilities of QGIS and ArcGIS for Desktop?
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0answers
209 views

How to view error feedback in qgis when testing connection to postgres database?

Using qgis 1.8 on Ubuntu 10.04 with Postgres 8.4.13 I am creating a new (and my first) Postgresql connection in qgis. I can connect to the user and the db using the pgsql client. ...
3
votes
1answer
789 views

Get extents of vector shape features in python

i am just wondering if it is possible to iterate through vector features and return the extent per feature without clipping the vector shape? The code looks like this and comes from the ...
1
vote
1answer
181 views

Unable to load the GADM data in QGIS

I have downloaded the shapefile of Mexico's Admin Boundaries from the GADM site but I am not able to load it in QGIS. It keeps giving me the following error, ...
7
votes
4answers
7k views

Using android phone to plot GPS points?

I was wondering if I could use my android phone (HTC Wildfire) to plot gps points and export these into GIS software (I have QGIS and MapInfo). Thanks, Alan
0
votes
0answers
76 views

QGIS anno labels

Is there a way to copy and paste Anno Labels in QGIS? I have a layer that contains Parking Restriction information e.g. No Waiting or Limited Waiting 1 hour Mon - Fri 9am - 10pm etc. There are lots ...
2
votes
1answer
99 views

Listing installed QGIS plugins via PyQGIS

Can you please tell me how I can programmatically (or from the console) access the loaded plugin list? I tried: QgsProviderRegistry.pluginList() but got: TypeError: ...
10
votes
1answer
393 views

Is it possible to edit layers from a FGDB - File Geodatabse in QGIS?

I think I've found the answer (you can't edit FGDB's) but there seem to be few reports around that it is possible to edit FGDB files in QGIS. Can anyone advise if it's possible to setup QGIS ...
4
votes
1answer
577 views

Is there a recipe for large shape files to be used in an Android App?

I am very new to GIS and I am diving into cartography and mapping because of an Android App that I am currently developing. I want to display environmental data, more precisely noise pollution data on ...
3
votes
1answer
166 views

How to draw parallel or curved labels for OSM data in QGIS?

I'm trying to recreate a Google style map using OpenStreetMap data and QGIS. I've been following underdarks many wonderful guides but am getting stuck at the labels. The OSM data was taken from ...
4
votes
1answer
216 views

Export shapefile to filegdb with specific projection

I tried to export a simple shapefile with polygons via "save as" > Format "ESRI fileGDB" and choose "DHDN / Gauss-Kruger zone 3". So there is the error message : "Error: Failed at creating table for ...
1
vote
1answer
209 views

How to add a custom SymbolLayerV2 to a Vectorlayer in QGIS

I'm trying to add a symbolLayer with a line-decoration (line-arrow) to a vectorlayer of linestrings. what i am trying at the moment is to create a new layer and set it's QgsLineSymbol with a list of ...
3
votes
1answer
634 views

Creating Selection MapTool in PyQgis Custom Application

I'm developing a custom GIS application using PyQgis API. How can I let the user select features on the map using Maptools? I would like to replicate the select feature there in Qgis to make the ...
1
vote
1answer
465 views

Converting arcpy based python script to OGR for semi-automated Metadata creation

I have created a script to automatically generate base ANZLIC standard metadata using arcpy based coding. Can anyone help me convert it to OGR/GDAL python? This is so that it can be run in QGIS and ...
2
votes
1answer
319 views

python multiprocessing error in QGis (Windows)

I have this error when I try to use Manager() from python multiprocessing library. (Just start QGIS open Python console and execute the two following lines) >>> import multiprocessing ...
2
votes
1answer
2k views

Import GPX to QGIS with WGS84 [closed]

When loading a GPX-File in QGIS it is not referenced on WSG84. It´s shown with wrong coordinates. Settings are WSG84.
-4
votes
1answer
393 views

Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS

what is a user-friendly (ease of use) and functionality comparison for ArcGIS and QGIS? derived from Which topics are fundamental for ArcGIS? QGIS and gvSIG comparison
3
votes
1answer
1k views

Measurements in QGIS 1.8.0

I am using qgis version 1.8.0. My project contains tiff and several "shape" layers. The CRS is WGS 84 (EPSG:4326). I am attempting to measure the areas of the layer polygons. However if I click on the ...
0
votes
1answer
170 views

How to add a label of a point to a polygon

i have several polygons with in each polygon a point with a label (number). I want to add the label in the polygon to the attribute-table of the polygon it belongs to.
3
votes
1answer
438 views

Measurement units not returned in project CRS units

I am attempting to calculate area of country polygons using the field calculator. The layer in question is unprojected WGS84, but I have set the project CRS to World Equidistant Cylindrical ...
2
votes
2answers
917 views

Different NoData values when processing a GeoTIFF in QGIS and bringing it to ArcGIS

I'm trying to process a GeoTIFF in QGIS 1.8 using SEXTANTE and GRASS via the r.neighbors tool. I'd like to process the image, then be able to utlize it in ArcGIS. The problem I'm running into is ...
1
vote
1answer
423 views

Can I use a PNG point marker?

I want to style a point layer from png file. Can i do this in quantum gis?
0
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0answers
645 views

Help needed with the rendering of QGIS Heatmaps

Please could someone give me some advice on creating heatmaps in QGIS? I have tried to create these through both QGIS and GRASS, and fail miserably each time. In QGIS, I either receive an error that ...
4
votes
1answer
922 views

How to create a 500m Regular Grid for KML input area?

I am hoping to create a point grid over the city of Edmonton. My workflow is: Import a KML of Edmonton neighborhoods from here Save the layer as a SHP Delete the layer and load the SHP Define the ...
1
vote
1answer
781 views

How to select features where attribute is not NULL?

I have an OS AddressBase shape file. One of the attributes is 'paoText'. It is either a text string like 'Anchor House' or is NULL. I want to extract all the records where there is a text string ...
2
votes
1answer
271 views

How to get all attributes from a non geometry PostGIS layer with Python in QGIS?

I want to extract all attributes from a non geomety layer in QGIS with Python, but there is only the function uniqueValues(fieldIndex) More specific: I have a postgresql table which is loaded into ...
9
votes
1answer
604 views

How to view a 155 MB raster stored in PostGIS?

I am using the following command to load a raster into a postgres database: raster2pgsql -I -C -e -Y -F -s 3086 -I -C -M myraster.tif myraster -F -t 30x30 | psql -U postgres -d database -h localhost ...
8
votes
1answer
332 views

Is there a 'QGIS Browser' app on mac?

Starting at 1.8, there's a standalone Quantum GIS Browser application on Windows. I am unable to locate that app on Mac. There is a 'Browser' panel for Mac but its functionality is limited.