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

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Link QGIS to Anaconda Python Distribution: Spyder, iPython Notebook, pip, scikit-learn

I have Anaconda as my primary Python distro, and want to route Python related QGIS scripts through it. With Anaconda, I have Spyder, can easily install packages with pip, and can launch a iPython ...
2
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0answers
53 views

Matplotlib error when installing Molusce or lifemapper in QGIS Brighton

I am installing plugins via the QGIS desktop internal interface, and have had twice now messages associated with matplotlib. The first error was for something called lifemapper and now for MOLUSCE. ...
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0answers
27 views

QGIS symbols using “advanced — size scale field” aborts rendering if encounters negative [closed]

Not sure if this is new in QGIS 2.6 Brighton, but I was struggling to get my points (small area centroids) to properly scale in size based on attribute values (population growth). Only a few dots ...
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1answer
23 views

Is there a way to configure QGIS to prevent the st_extent call when adding a PostGIS table?

I'm trying to add an extremely large table with a points geometry field to QGIS and QGIS appears to hang. After some investigating in the postgresql database, I tracked it down to a st_extent on ...
2
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1answer
63 views

How to keep georeferencing from ArcGIS when importing raster into QGIS?

I tried searching for the answer to this, but I didn't see anything, so here it goes: I have previously georeferenced some .png raster images in ArcGIS 10.2.2, and could like to import them into ...
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11 views

Connect and modify map through localhost in ubuntu (content management system) [closed]

How can i set cartaro in linux,facing problem with installation instruction given on site.
2
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1answer
60 views

How to get the difference between two versions of a Shapefile?

I have two shapefiles that are the same in terms of the type of information they contain (same attribute fields). One is essentially an updated version of the other, so the newer version contains all ...
2
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3answers
36 views

Change projection didn't change position in a vector shape in qgis

I got a shape of points and when i save it with another datum and open it again, it stays in the same position. I was hoping for a slight change in position when save from epsg:5361 to epsg:32719.
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1answer
49 views

How to install QGIS on Centos 7?

I tried by following the instructions described here but they don't work. It looks like the repository mentioned in those instructions is actually not working: ...
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1answer
48 views

Reading .csv file in QGIS [duplicate]

I am trying to join a .csv file with a .shp file in QGIS but QGIS is unable to read the data in my .csv file as it indicated that the variables are string of length and precision 0. As a result, I am ...
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0answers
16 views

Georeference Plug-in not Opening in QGIS? [duplicate]

for some reason georeference plug in will not open. I click on it and nothing happens. I have never had any issues with it before. I have also just installed version 2.6.0 to see if that solves issue ...
3
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1answer
49 views

Select duplicate attributes in same shape file in QGIS

I have this vector layer of lines between 2 nodes. I need to select all second entries that have the same length of the previous one. Can someone help me with this?
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0answers
23 views

different data range of raster file in mapserver and qgis

a NetCDF file with only one band with a data range from [0,1.1]. IDV & QGIS identifies it correctly, however gdalinfo finds the data range [1,26505]. Or could it be possible that gdalinfo is right ...
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1answer
43 views

Are there any options/plugins to allow labels in busy screens to be visible in QGIS?

I have quite a busy screen, showing a large number of polygons in a small area. I would like each of these to be labelled neatly, without the 'crowded' feel of overlapping labels, as suggested in the ...
2
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0answers
55 views

Error 5 Pixel type must be FLOAT32

I am trying to create a DEM from topographic contours vector. I have already sucessfully created a raster using the interpolation plugin. Firstly, I don't know why or how to ccontrol the output ...
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0answers
38 views

Create Polygon from coordinates? [duplicate]

I have coordinates in string format like POLYGON ((7.4986406 6.431006900000041,7.498971 6.43207,7.499096 6.432481,7.499398 6.43182,7.499522 6.431524,7.499529199999982 6.431510499999964,7.499529 ...
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1answer
85 views

How to fix python ImportError: DLL load failed: The specified module could not be found?

During import fiona, I am getting following error. Error is different from other user so I asked this question may be it is repeated. import fiona Traceback (most recent call last): File ...
4
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1answer
92 views

Finding maximum radius of circle within irregular polygon without using ArcGIS Spatial Analyst?

I have a problem which I think could be handled by using the toolset "zonal" / zonal geometry in the ArcGIS Spatial Analyst toolbox. However, I do not have a license for Spatial Analyst, so I am ...
3
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1answer
40 views

How to filter QGIS layer from python?

Using QGIS 2.4 python console, I'm trying to display only a subset of a layer features. I've managed to get the features both from the layer : featuresIterator = ...
3
votes
1answer
23 views

Control points display location changes with scale

I'm trying to georeference an image by choosing points from Map (imported from Google hybrid) however the resulting tif is in no way located similar to the points (in fact the control points don't ...
2
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2answers
58 views

Cannot Install QGIS Mapserver On Ubuntu 12.04

I'm trying to install qgis-mapserver on my ubuntu 12.04. I just installed qgis desktop 2.6.0-brighton successfully. Here is my steps when installed the desktop : sudo apt-get install ...
0
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1answer
26 views

SAGA Cluster Analysis for grids projection issue

I am having an issue with the SAGA cluster analysis for grids tool within QGIS 2.4. I am actually taking this as an online class through Del Mar and we are going over supervised and unsupervised ...
3
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2answers
77 views

How can I determine which raster attribute covers the highest area of a polygon?

I'm relatively new to GIS and QGIS but I have a problem that I'm not certain how to solve. I searched here for relevant information but found none. (Or, I used incorrect search terms.) My problem ...
3
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0answers
19 views

QGIS Cross Section Profile Distance using Ellipsoid?

I am working with QGIS 1.8 and 2.6 and can't get any of the Cross Section Profile tools to provide the ellipsoid ("proper") distances. All the distances use geographic coordinates which are too ...
2
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1answer
43 views

How can I place a ETRS89 layer to WGS84 project in QGIS?

I've got a QGIS project with several layers with SRC EPSG·4326 - WGS84. I have downloaded from a government website a layer projected in ETRS89. I have tried my very best to match this new layer with ...
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3answers
59 views

how do I group layers in QGIS 2.4.0 [duplicate]

As written in the Title: How do I group layers in QGIS? I have tried dragging them on top of each other and looked in the layers setting but could not find anything.
2
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1answer
41 views

How to add documentation for QGIS Processing algorithms?

In the Processing modeler, many of the algorithm help tabs say: Sorry, no help is available for this algorithm. In the QGIS sourcecode, the processing algorithms seem to reside in: ...
3
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0answers
54 views

How to submit user scripts for Processing Toolbox (QGIS 2.6)?

QGIS 2.6 change-log says that now there is some kind of repository where users can submit their scripts to make them available for everyone. Unfortunately I was unable to find any details about how to ...
2
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2answers
87 views

Programatically use Openlayers plugin layer in Print Composer

I created some PyQGIS functions to set up a print composer, modify the layout (adding maps, legend, title...) and print the result as an image file. This works fine with one or several vector layers - ...
3
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1answer
49 views

GIS through Games: Ideas or Links [closed]

I'm managing a project - http://nepanode.anl.gov aimed at improving data awareness and sharing around Environmental impact analysis. I'm struggling to come up with ways to engage users and show them ...
3
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0answers
13 views

Action: Move pointfeature to other layer - Point becomes Multipoint

I'm trying to write an action that moves a pointfeature from one layer to another. It works fine until i try to save the layer with the new feature on. He says he can't save a MULTIPOINT to a ...
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1answer
36 views

how to split/cut a linestring with another a linestring

Is it possible to cut a linestring with another linestring where both of lines are coincidence using SQL to get a multilinestring?
2
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0answers
26 views

How to calculate 'off track' error from GPS data?

I'd like to analyse navigational accuracy, comparing planned transects with the actual track flown from GPS data. For example, the planned transects below (green) don't match perfectly with the actual ...
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1answer
24 views

importing shapefiles to postGIS on QGIS1.8

I am trying to import a shapefile into postgis from within QGIS 1.8. The QGIS is based on a server that is not managed by myself. I have requested an upgrade to QGIS 2.0 ...but this may take ...
3
votes
1answer
54 views

QGIS Plugin installed but reported as invalid

I'm just discovering QGIS so please excuse my ignorance! I have QGIS 2.4.0 installed, and am trying to install Ordnance Survey Mastermap data. I have installed the OS2OGR translator to handle the ...
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0answers
48 views

How to create shape file and show in map using Python?

I have calculated distance between longitude and latitude by import .csv using python. Now I want to show this points or distance between points in map. So how can i do it by using only python? and ...
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1answer
79 views

Installing QGIS for Viewing purpose only and not edit?

I would like to find out if it is possible to install QGIS to be able to view and query data but not be able to make edits,is this possible.Can someone please advice how to do this.
2
votes
1answer
35 views

How to export subset of data in QGIS to DXF

I have QGIS loaded with multiple layers. I want to save to .dxf but the map is so massive it results in a very large file. I only need a small portion of the map, so I was wondering how I can crop the ...
3
votes
1answer
52 views

QGIS Quantile method

I have a question about the quantile classification in QGIS (2.6 and master, windows or linux). I used the points in polygon fonction. I have 100 polygons. In the attributes of my 100 polygon I get ...
2
votes
1answer
55 views

Zebra grid style does not works in map composer

in Qgis 2.6, in Map composer, while selecting grid frame style as Zebra, it does not works. Also while drawing coordinates points as exterior in map convas, it is not displayed. Actually I am facing ...
2
votes
2answers
44 views

Exporting from Draftsight: how to set correct co-ordinate system

I'm trying to import a DXF into GIS (I have QGIS, Arcmap 9.2, GVsig ) The file has been given a coordinate system & appears to be the right size, just in the wrong place. In Draftsight (or any ...
3
votes
2answers
54 views

PyQGIS: Speed up for adding features and attribute arrays?

Context: I'm writing a dynamic import tool for QGIS (2.2 to 2.5) with python. Datatype: Binary Datasets with environmental simulations from HPC which might contain millions of features and terabytes ...
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2answers
44 views

how to know distance of a point to a shape in a certain orientated direction?

I have a point (in the middle of the sea) and I have to measure the distance from this point to the land. No big deal, I can use the measure tool. But what if I have to know exactly the distance ...
3
votes
1answer
56 views

Gaps and overlaps appear after cutting a previously topologically clean shapefile?

I'm using QGIS 2.2 and I have a polygon shapefile which was created by someone else. I have managed to get the shapefile to a topologically clean state by running v.clean but when I tried to cut the ...
1
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1answer
77 views

How can we merge the two selected features in a vector layer

I have taken one feature and find which are the neighbouring features to the feature which i have taken and then i have combine all those neighbouring features with my feature to make one feature. i ...
3
votes
1answer
36 views

Label points at regular interval using qgis

I have a point shapefile with a point index. Like the first picture. I'm trying to label the point index every 30 points to obtain the second screen capture. I also have an attribute R3 or R4 to ...
2
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0answers
47 views

How to add column to attribute table using field calculator with $length function?

I used the following code to add a separate column to the attribute table with the length of features. from PyQt4.QtCore import QVariant from qgis.core import QgsField, QgsExpression, QgsFeature ...
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1answer
36 views

Open Source counterpart to Euclidean Allocation

I'm looking for a function that can perform something similiar to the Euclidean Allocation process in arcGIS ...
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1answer
109 views

QGIS 2.6 Curriculum Redo?

We are in the middle of creating GIS curriculum based on QGIS. When we started in June 2014 it was still 2.2, then 2.4, now 2.6. You think it's worth returning to step 1 and begin again in 2.6?
2
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1answer
97 views

How to load a WMS layer using PyQGIS?

Although there are some posts on this matter, there is no answer in anyone of them. This is why I am asking it again. One post I found was Raster layer invalid I read information from the following ...