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

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1answer
259 views

how activate qgis features selection toolbar in the main window

How can i activate and desactivate qgis features selection toolbar in the main window using a signal in a python plugin?
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2answers
74 views

Adding shp files to PostGIS in QGIS 2

I followed this tutorial to set up Postgresql 9.1 and PostGIS 2 on my Ubuntu Server 12.04. I also installed pgAdmin III on my Windows 7 client. I set up a database landarch and user chadmwade, ...
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116 views

Is it possible to create standalone installers for QGIS plugins?

Plugin in QGIS are managed by the internal plugin manager, and this requires active (and fast) internet connection. Another way to do it offline is answered here How to install a QGIS plugin when ...
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136 views

Problems with QGIS plugin traceDigitize on Mac?

I'm trying to get the traceDigitize plugin to work with QGIS 2.0.1 on my Mac while following this tutorial but I get this error as soon as I ctrl-click: An error has occured while executing Python ...
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0answers
85 views

Installation of SDA4PP

I have downloaded the plug in SDA4PP for QGIS. I'm trying to install it but I don't see the Add 3rd party repositories under the Repositories tab of the QGIS python plugin installer. This step is ...
2
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1answer
30 views

Selecting Polygon Features in QGIS Lisboa

I want to select and save as a separate shape file, a smaller section (polygon) from a whole island country which includes both land and shallow habitat coastal features (like coral reefs) and when I ...
2
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1answer
2k views

How to produce multiple maps with same layout for different layers' extents?

I have an area which is divided into several zones the borders of which I have defined as separate layers. The layers are defined by sql queries on a postgis table of line segments joined with a ...
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1answer
78 views

Using QGIS Icons in Private Projects

I am looking at a software development project where we will make the software open source. The GUI will have icons, and I like the look and feel of some of the icons on QGIS 2.0. Are there any ...
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1answer
103 views

Misaligned GADM shapefiles and the NE dataset

I am very new to using GIS programs, so please excuse me if this is a trivial question. I'm having the following problem: When adding a GADM shapefile layer for Uganda onto the Natural Earth set of ...
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4answers
1k views

Issues using geographic and projected coordinate systems QGIS 2.0

I am having issues with QGIS 2.0.1 working between local projected coordinate systems (such as OSGB36, NAD83) and Geographic systems (such as WGS84). The stock answer I have been provided is 'load ...
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1answer
83 views

How to load interlis1 files directly into QGIS 2.0.1 Dufour 64Bit (W7Pro)

with earlier version of QGIS (1.8) it was possible to load data in interlis 1 format directly. If I try now it says something like unknown format. Is this because I'm using the 64Bit version of the ...
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1answer
260 views

QGIS proximity raster with extent beyond original coverage?

I need a raster coverage of distances from points outside the geographic region of interest, and am having trouble doing this with QGIS. Questions like this one (Calculating distance to points in ...
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1answer
7k views

Why can't I edit attribute table imported through 'text as layer'

I imported the coordinates from an Excel table. They show as single points as intended. Now I want to add columns to the attribute table, but I'm not able to edit it. I wanted to import the following ...
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0answers
45 views

Stop QGIS opening in a new workspace in Ubuntu

Very basic issue I imagine other Ubuntu users will have encountered: every time you open QGIS, it does so in a new workspace - note the arrow in the sidebar is empty not full, just after opening QGIS. ...
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1answer
229 views

Different output from running algorithm in toolbox and from script

I am unable to get the same results when running the qgis:reproject tool from QGIS processing toolbox (QGIS version 2.0.1) as when running it from a Python script (console). In this example I am ...
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1answer
202 views

QGIS Python Composer Attribute Table has no content

I post 2 Month ago the same question. So I try it a second time with more code. My Problem still is that I add at the composer a attribute table and in this table there is no content. My Code: ...
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2answers
241 views

Issues with Selection and Viewing of Attribute Table using QGIS and SQL Server Express 2008 R2

I am having issues with Selection using QGIS 2.0.1. Dufour. When I select one point, all of the points get highlighted. Attribute Table dialog shows Errors for all of the attributes. It indicates that ...
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1answer
789 views

Where are the 'preloaded' images for the composer

Hi I am trying to add a North arrow to a map in the composer in QGIS 2.0 on a Mac. Googling tells me to simply add one from the preloaded images. When I click the add image icon I get a dialogue ...
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2answers
779 views

Exporting polygon shapefile with lat/lon points

By copying rows of the attribute table of a polygon shapefile, I figured out how to extract the points of the given polygon but to my surprise, they are formatted backwards: POLYGON(( ...
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2answers
4k views

Loading PostGIS raster layer into QGIS

I am unable to load a PostGIS raster layer into QGIS. I have looked through previous posts Loading raster from PostGIS DB into QGIS and Cannot add the PostGIS raster layer with QGIS but was not able ...
2
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1answer
210 views

How to handle plugins of two different QGIS installations on the same computer

I have a computer with 2 versions of QGIS. Both versions are running on Win 7 64 bits with 16 Mb of ram. One is Dufour 32 bits and the other one is version 2.1 OSgeo4W 64 bits. I am experimenting ...
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3answers
2k views

QGIS - Convert Vector points to GPS waypoints and route

I'm new here. I have a shape file with a series of points (around 300) using British National Grid. I need to put them on my Garmin Etrex 10 as waypoints. Can someone tell me how to convert this ...
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0answers
418 views

Saga Reclassify grid problem

I am using Qgis 2.1 ver. 5f5cd4c (64 bit version on win7 64) OSGeo installed. I was trying to reclassify a DEM in EPSG:32614. I used the SAGA's Reclassify algorithm in the processing toolbox. I ...
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0answers
60 views

Ádvance Python Field Calculator - Global Expressions [duplicate]

I am trying to create a global expression that populates a new field based upon existing values in an attribute table. I am using QGIS Dufour and the Sextante toolbox, and the "Advanced Python Field ...
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1answer
1k views

How to get custom colormap onto 3D NVIZ in QGIS GRASS

I am trying to create a 3D version of my 2D raster using QGIS GRASS NVIZ. I have been following these steps: ...
3
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1answer
178 views

Create a band mask based on pixel locations, not in pixel values

I have this image loaded in QGIS, with two possible values for the pixels: 1 = orange, 2 = blue For simplification, assume it represents a province of a country. I want to extract just the part of ...
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2answers
162 views

how to identify qgsvectorlayer area?

I need to identify the area from Qgis qgsvectorlayer anyone have an idea how to do that in python ?
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1answer
66 views

Questions about EPSG:6372

I'm using QGIS 1.8.0 and as CRS EPSG:6372 a projection for Mexico, defined by the Instituto Nacional de Estadística y Geografía (INEGI). I have the following questions: If I measure the minimum ...
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1answer
45 views

file type needed to add layer containing contour lines

What file format is usable/recognized by qgis to add contour lines to a map? I'm working with Linux Mint 15, and qgis 1.7.5
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35 views

QGIS rule-based point style responding to number of co-located objects? [duplicate]

I am mapping the geolocated location information for 5.5k Twitter profiles as point data. Many of them have the same location ie "London, UK" meaning that they return identical coordinates. On the map ...
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2answers
366 views

No prj file output from qgis:reproject

I'm trying to reproject a vector layer using the 'qgis:reproject' algorithm in the processing/sextante module of QGIS, from Python. This kind of works, but the .prj and .qpj files created after ...
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0answers
4k views

QGIS 2: How to create a regular vector grid at fine scale and for large area? [closed]

In QGIS, we wish to create a regular vector grid with 25*25m resolution and over an area of around 12000 km2. We tried to use: -vector>research tools> vector grid - and v.mkgrid function from GRASS ...
6
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1answer
2k views

Using in-memory vector layer with QGIS processing / SEXTANTE

I'm trying to run the qgis:clip algorithm from console, but am getting an error when using an in-memory layer as the overlay parameter. Is this to be expected, or am I doing something wrong? Code: ...
2
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1answer
211 views

How to change the colormap in QGIS 2.01?

I decided to say goodbye to ArcGIS and switch to QGIS which is nice, but it has given me a hard time to handle various problems. Few months ago, I made a map using QGIS 1.8 with a relief background ...
4
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1answer
275 views

qgis delaunay circumcircles

Is it possible to show the delaunay circumcircles in QGIS? I know how to make the Voronoi polygons and Delaunay triangles. I found a web page that shows the circumcircles at: ...
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3answers
1k views

QGIS 2.0 text delimited layer importing data as single row

I'm trying to import a text delimited layer using lat/lon, but the tool interprets the data as a single line. I've tried saving my csv using several different programs (Stata, python editor, text ...
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1answer
217 views

QGIS Grass Plugin fails with r.cost.vect

I tried the following in QGIS with the Grass Plugin: r.cost input=preCostSurface@albi start_points=OSMroads@albi output=cost0109 max_cost=0 And I get the following error: Dev note: Adapted sites ...
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0answers
444 views

WFS connect SSL handshake fails

I'm running geoserver on my own server at home. Everything works great usually but when I try to connect to WFS from QGIS over https I get a warning saying SSL Handshake Failed. This is probably ...
2
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1answer
217 views

Georeference image is mirrored

I'm working with QGIS and I'm trying to geo-reference a tobin lease map. The map datum: NAD27, projection: UTM Zone 14N. The process to georeference is fairly straight forward but the results I'm ...
3
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1answer
234 views

Why do area measurements from “measure area” tool and field calculator differ?

My problem is when using the "measure Area" tool on the toolbar I get the correct value but when using the field calculator in the Layer Attributes the area is very different including -ve areas. ...
2
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3answers
7k views

How to create points based on the distance and bearing from a survey point?

I am plotting witness tree data to calculate pre-settlement tree density. I have a shapefile with points along section lines (square miles) at each half mile. I am making another table that contains ...
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2answers
202 views

geoprocessing across multiple vector layers QGIS2

I have 6 layers of point data (each layer is one year), where data in each layer are distributed throughout a grid, and the grid is identical in each layer. I'd like to extract data from each layer, ...
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1answer
617 views

Select by SQL in QGIS Python

In the GUI there is the Query Builder, but that does not seem to be easily available in Python. The processing (SEXTANTE) module has the qgis:selectbyattribute algorithm, but that only supports ...
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0answers
238 views

How to find out Why a QGIS plugin is rejected for Version 2

I have a selection of python plugins (one rather large one) that I have developed under Qgis 1.8 and that I am migrating to qgis 2.0. The error that the Plugin Manager gives me when I load these ...
2
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1answer
335 views

how to use “data defined override” in qgis 2.0?

How can I use the new "data defined override"-funktion in qgis 2.0? I did not find any further information about it in the handbook an somewere else. I want to label my layer with different front ...
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1answer
382 views

Raster terrain analysis on QGIS 2.0.1 - No curvature analysis?

I need to perform a curvature analysis on a DEM. I've found this tutorial ...
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1answer
477 views

How to calculate the intersect two shapefiles [duplicate]

I have two shapefiles. 1. the clinic buffers 500m area. 2. the postcode area. Is there a simple way to calculate the intersect two shapefiles ? I'm using QGIS Dufour. I tried to use fTools to ...
2
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1answer
318 views

Reprojecting Natural Earth dataset to World Eckert I

My question is connected with QGIS 2. Could anybody explain me how I ought to reproject the Natural Earth dataset there in order my world map to look correctly? When I strive to reproject these data I ...
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1answer
381 views

How to automatically update coordinates in print composer?

I tried "$x" and "$y" for coordinates but it always give me zero "0" values too, and what I really want is to display the coordinates like in this image.
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0answers
73 views

Using QGIS plugins from Python [duplicate]

Is there a simple way to automate calls to QGIS plugins from a QGIS Python script? Either from console or a plugin? I am ideally looking for a way to specify input/output parameters and bypass GUI. ...