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

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63 views

How to auto-fill a new point vector in a vector layer?

When I work in-situ I manually add points in my shape-file. I would like that when I add a new point some attributes would already filled with values calculated programmatically. E.g in my first ...
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1answer
45 views

Inserting attribute table into QGIS Composer is limited to 99 rows

Inserting attribute table into QGIS Composer is limited to 99 rows? Or am doing something wrong? Stems from How to import or incorporate formated Excel tab into QGIS print composer
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1answer
145 views

How to set field values as labels in QGIS2 Print Composer

I am mapping the distribution of 325 bird species, displaying circles in the grid cells each species occurs in. The data contains as many duplicates of the NAME as there are cells in which it occurs. ...
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2answers
322 views

How do i draw a route on Quantum GIS between nodes?

I have a requirement to trace path on the points present in the shapefile which is loaded in Quantum GIS. This should enable the user to specify their own routes within the present network. There ...
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0answers
153 views

how can i read an attribute value from qgsfeature?

How can i read an attribute value from qgsfeature ? i am trying to update some attribute using other and i have to read value from attribute in the qgsfeature . my source code: provider = ...
3
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3answers
342 views

QGIS spatial join, calculating distance from polygon to point layer

I am trying to perform a kind of 'spatial join' in Arcgis, joining to a polygon layer atributes of the closest feature of a point layer, as well as distance. But 'spatial query' doesn't offer an ...
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3answers
191 views

Research study participant mapping and analysis - comparison of software

I am new to everything GIS. I have been researching different software but have found more questions than solutions. What I want to accomplish: I'm working on a research project with participants ...
6
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2answers
2k views

Resources on using R in QGIS for R users?

This is a very basic question, but I'm having a heck of a time figuring it out because so much of the QGIS documentation is oriented toward use of the GUI. I want to be able to run R scripts in QGIS, ...
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1answer
511 views

How to activate a layer in QGIS layers legend

How can I activate a layer in qgis map legend automatically using python code . I am using qgis.utils.iface.setActiveLayer(self.theLayerToEdit) but the layer is still not checked in the maplegend. ...
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1answer
151 views

Species atlas (how to automate to create on page for each species with QGIS)

With the use of QGIs, I would like to create an Atlas for a batch of species, with: a background with the country (from a vector layer or from the openlayer plugin). a vector layer (polygon) to show ...
2
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1answer
91 views

Raster layer calculator

In PCI Geomatic, I have two raster layer.raster1 identified like %1 and raster2 like %2. if (%1 <= 10) then %2 = 60 elseif (%1 > 10 and %1 <=50) then %2=80 elseif (%1 > 50 and %1 ...
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2answers
60 views

Error point sampling tool

I'm usig QGIS 1.8.0 and I did some interpolations. Now I want to do some sampling with the point sampling tool but I keep getting this error (I attach a picture of the error message). Does anybody ...
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1answer
83 views

Missing a Geom field in PostGis

I am working in a Database preaparation for that I exported a shapefile from Qgis to PostGis.The Problem is this: In Qgis I can see a Polygon feature but when the same polygon feature is exported to ...
2
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1answer
179 views

How to create an animated map in QGIS which cycles through column values

So i have a shapefile with 40 polygons(rows) and 30 columns where each column represent values from different time period. I have created a map with graduated style by choosing values from one column ...
2
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2answers
453 views

How to load memory output from QGIS processing?

Many processing algorithms have an option to save output as memory. If ran from toolbox, this works fine, because you can tick the "Open output file after running algorithm" box. Looking at the ...
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1answer
187 views

QGIS-server and mapproxy. Management of the transparency of a layer

I have problems using mapproxy with QGIS-server via openlayers (mapproxy-1.6.0, qgis-server 2 and openlayers-2.13.1). I have a layer in which i defined the background of the polygon with ...
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0answers
162 views

Ecw not supported with qgis-mapserv-fcgi but supported in QGIS Desktop - resolved

I have problem with qgis-mapserver version 2 and ECW. Qgis Desktop works well with ECW (gdal support for ecw with the library ERDAS_ECWJP2_SDK-5.0) but not qgis-mapserver (not supported file in ...
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0answers
118 views

Touch up tool for rasters?

I was wondering if it were at all possible to manipulate/massage rasters (eg Geotiff) using Qgis plugins or Grass?? By manipulate, I mean manually smooth off interpolation artefacts, blended surface ...
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0answers
135 views

Points warped when exporting to shape file (position off in Qgis when imported)

I have just purchased a used Trimble GeoXH and I have done some surveys. I did the differential corrections in Trimble Pathfinder Office 4.10. I have exported the corrected and uncorrected files and ...
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1answer
67 views

Google Map API and OS Opendata in QGIS

I'm new to gis and having problems with matching reference systems for my two data sources. I have downloaded some OS Vectormap data which I believe is in 27700.. And I have some longitude and ...
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0answers
27 views

open shapefiles interpreted in Qgis, in ArcGIS [duplicate]

I set up a project with a Landsat TM image, and interpreted three shapefile layers with different line interpretations. I now need to open the layers in ArcGIS. The Landsat will open, but the ...
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2answers
718 views

install GRASS Addon in with QGIS

Win 7 QGIS 2.0 GRASS 6.4.3 Hi everybody, I want to install some GRASS-Addons to use them in QGIS. Therefore I run GRASS-Plugin in QGIS an open the GRASS-Shell type: g.extension GRASS opens then i ...
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1answer
129 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
70 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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0answers
82 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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0answers
121 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
74 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
25 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
votes
1answer
453 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 ...
0
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1answer
64 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 ...
2
votes
1answer
70 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 ...
3
votes
4answers
727 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
58 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
63 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 ...
3
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1answer
2k 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 ...
2
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0answers
41 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
121 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
131 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
160 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 ...
2
votes
1answer
368 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 ...
2
votes
2answers
333 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(( ...
4
votes
2answers
2k 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 ...
1
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1answer
109 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 ...
3
votes
3answers
977 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 ...
1
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0answers
216 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
49 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 ...
2
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1answer
692 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
votes
1answer
126 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
96 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 ?
2
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1answer
48 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, I hope you can help me out. ...