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

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2
votes
2answers
89 views

Problem with PostgreSQL View layer in QGIS

I have a PostgreSQL table and view: CREATE TABLE lines ( geom geometry(MultiLineString,4326), type character varying(254), login text, gid serial NOT NULL, ...
1
vote
0answers
12 views

How to SetVisible a layer without redraw all the mapcanvas

I am working with QGis 2.8.2 API c++/ QT 4.5 I am displaying a lot of layer in a mapcanvas, I am looking for a method like setVisible(boolean ) in order to setvisible or not a specify layer ...
4
votes
5answers
141 views

GPS Track Editor to crop tracks with select by clicking start and end points

I'm trying to take a bunch of gps tracks of mountain bike rides and turn this in to a trail map. I want a single track for each trail. I'm looking for an editor that will allow me to select a ...
1
vote
0answers
40 views

CSV file locked for editing after join

I have created a table join between a vector shape-file and a csv file using pyQgs. Now i want to edit the csv file (not from inside QGIS) . But when i double click on the csv file , it says that ...
2
votes
1answer
33 views

How to calculate the form (or shape) factor of a polygon?

I am using QGIS to calculate the form (or shape) factor of polygons following what Louf and Barthelemy did here: http://rsif.royalsocietypublishing.org/content/11/101/20140924 The form factor is ...
1
vote
1answer
35 views

QGIS export attribute table to csv and keep value relation

If i export my joined table to csv i get the numeric id value instead of the value relation name from the joined table. Can I export my table with the value relation value? Best regards
1
vote
0answers
34 views

Calculating minimum distance using “Distance Matrix” in QGIS

First of all, I'm very rookie in using QGIS. I want to calculate minimum distance between points and a line in QGIS. I use "Distance Matrix", point shape file contains 1337 points data, and I made ...
2
votes
1answer
64 views

How to add loading bar in QGIS Plugin development?

Every time i use tool or plugin in QuantumGIS, i saw a kind of bar like this for indicating loading progress : The different between that bar and Progress Bar is that progress bar will increase ...
4
votes
1answer
50 views

Projecting a world map on 6 segments to print on ball

Working with QGis and data from Natural Earth I would like to prepare a world map (1:50 000) for a globe that can be printed in 6 segments, which glued together build a ‘sphere’ (ball) according to ...
1
vote
2answers
69 views

Python and QGIS multiprocessing documentation?

Where can we find better documention for python QGIS multiprocessing. Especially regarding the multiprocessing of python and QGIS.
0
votes
0answers
30 views

Postgis ST_Azimuth only returning a small range of angles

I have a puzzler with postgis and ST_Azimuth. I have a table of points (taken from country borders, and run through the QChainage plugin). I want to find the azimuth from a fixed point (15.0,50.0) to ...
1
vote
0answers
44 views

Print/Export Attribute Table in Form View (QGIS 2.10.1)

Is there a means or available plugin which works to enable a direct print of the attribute table in form view? I recall this feature was on many a wishlist back around 2.6, but I'm unaware if the ...
0
votes
1answer
42 views

QGIS Vector Data with blank attribute tables

I have vector data shapefiles for Manitoba, but there is no names in the attribute tables. It seems Manitoba is still working on their attribute data. Is there a shapefile I can download to get these ...
1
vote
1answer
26 views

QGIS - Level curves - Voronoi Polygons

I am facing a difficulty in QGIS (2.8.2): I have three layers: layer 1: layer with points layer 2: layer of level curves (contour lines) layer 3: layer of Voronoi polygons obtained from the points ...
3
votes
1answer
49 views

Standard user interface for QGIS plugins

QGIS plugins found in "processing" all have the same user interface. In particular, to open a file, the selector either show the list of already downloaded files, or have a "..." button to browse and ...
1
vote
0answers
31 views

Opening shapefile and Tiff layer Coordinates do not match up

I am new to using QGIS and am having a major problem. I have the UK Ordnance Survey (OS) 1:25000 raster layer in Tiff format open. When I open a shapefile or mapinfo vector layer on top of it the ...
1
vote
1answer
40 views

I am using “Hindi and Gujrati” font then I am getting “Black Squre Dots”?

At the time of generating PDF file when I am using “Hindi and Gujrati” font then I am getting “Black Squre Dots”. Below I am using code. Here I am trying to convert in UTF-8 but it’s not converting. ...
2
votes
1answer
148 views

Same Raster but different min/max in ArcMAP and QGIS

since I am abandoning windows to stay only with Linux, I started learning how to use QGIS. So far so good. However, trying to reproduce a python script from Arcpy to PyQGIS I noticed something. When I ...
10
votes
5answers
185 views

Fisheye-like projection

I need a special projection for the purpose of effective presentation on a poster. I'd like to present the study area (Czech republic) in a context of whole Europe in such a way, that the Czech ...
0
votes
1answer
59 views

How to connect QGIS to PostGIS? [duplicate]

I want to establish connexion QGIS and PostGIS in order to run the pgRouting Layer, how can I do it?
1
vote
1answer
24 views

Convert Shapefiles into Raster — C++

I'm coding an algorithm which uses as an input a map from QGIS. The software has been implemented in C++ and my idea is to convert, automatically, a shapefile into a raster one. Is there any function ...
1
vote
0answers
40 views

What could be making QGIS 2.10 crash when loading a project file?

On QGIS 2.10, running on Ubuntu 15.04 Linux, I have a project file that has a fairly large number of mainly shapefile layers, which gets to 99% on the slider to the right of where it has a message ...
1
vote
0answers
30 views

Suggestions of route optimization algortihms to implement on QGIS

I need to compute routes on a QGIS project with time and distance associated. Is there any route optimization algorithm to compute routes given the points that one want to connect?
1
vote
0answers
30 views

QGIS 2.10.1 : Function editor tab indents generating errors …?

i'm trying the function editor in QGIS 2.10.1 (windows 32 bits). I always get "indents" error as the function editor inserts TAB indents instead of spaces ... How do i solve this issue ? Thanks ...
0
votes
0answers
26 views

QGIS Spatialite tabular updates are very slow

I am exploring Spatialite in QGIS (2.10.1), and it is very slow to save tabular edits (with 1200 records, several minutes once I click the pencil button, versus less than 1 second with the data as a ...
0
votes
0answers
22 views

Can we integrate QGis with Java? [duplicate]

Inegrateion of java with Qgis and its extensions? In case, If integration is possible can we use multi-threading qgis and java?
4
votes
2answers
175 views

How to correctly install QGIS 2.8.3 with GRASS plugin on Ubuntu 14.04?

I already tried to install QGIS 2.8.3 using the procedure described on: http://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubunt, but grass-plugin do not compare on plugin list! I tried ...
1
vote
0answers
38 views

QGIS open tif file larger than 10 GB, '*.tif is not a supported raster data source'

When trying to use QGIS to open a tif file larger than 10GB, I encountered an error says "*.tif is not a supported raster data source." Is there any way or other software to open large tif files?
1
vote
0answers
56 views

How to integrate QT User Interface with QGIS Python Plugin?

I created a very simple python program using GDAL to calculate the summary and reduction between two raster value like this : import os from osgeo import ogr, gdal from gdalconst import * ...
1
vote
1answer
37 views

QGIS label spacing

Wondering how to space out the road names on my QGIS map to make it look cleaner?
0
votes
2answers
26 views

What is the expected QGIS behavior when adding an ArcGIS Rest vector MapServer layer to QGIS?

The instructions here: https://hub.qgis.org/wiki/17/Arcgis_rest are straightforward, but I'm getting the same 1000 features regardless of extent (with the 1000 feature outside the viewable map extent ...
2
votes
1answer
35 views

How to create Time-Space Maps in QGIS or ArcGis?

im wondering if its possible to create a Time-Space Map in QGis or ArcGis. As i already found one can use rubber sheeting in ArcGis to create such an effect but as far as this goes you are about to ...
-1
votes
3answers
95 views

Getting error while opening excel file in Python [closed]

Hi I am very new to python, here i m trying to open a xls file in python code but it is showing me some error as below. Code: from xlrd import open_workbook import os.path wb = ...
1
vote
0answers
22 views

Quantumnik plugin replacement?

I am looking for export QGIS Style in MapNik (so, his .xml format) I see that Quantumnik plugin can do that, but is not supported anymore (and cannot be installed at all) . Is there any alternative ...
1
vote
1answer
24 views

QGIS is not starting because of deleted file libgeos_c.so.1,How can I fix it

QGIS is not starting because of deleted file libgeos_c.so.1,How can I fix it It was originally running but some how I have deleted this file for some porpose installation of postgis for postgress but ...
3
votes
2answers
54 views

QGIS: Creating Circles Around Points Imported from a Excel File (Lat, Long)

I am new to the QGIS platform and have been experimenting with the tool. I currently have a Basemap layer and a Shapefile layer on top of it. Now, I want to import a .csv file containing (lat, ...
2
votes
1answer
47 views

How to get a legend label on multiple lines in QGIS

This question was posted in 2011, and someone has said that QGIS now allows multiple lines for legend entries, but no one mentioned how to do this. I am running wein 2.8.1 and I cannot figure out how ...
0
votes
1answer
23 views

QGIS print composer atlas shortcut next feature

I have 25 features in the atlas of the print composer and I need to check every feature before exporting. It's quite annoying to click always the field in the status bar, so I wanted to use the ...
3
votes
1answer
60 views

How can i generate PDF file in python on QGIS?

I am following these instructions: https://bitbucket.org/rptlab/reportlab but i am getting this error: Couldn't load plugin Importtool due to an error when calling its classFactory() method ...
3
votes
0answers
18 views

QGIS Print composer Label Icon in Legend

In a legend of a map I want to label the icon with a number, just as it appears in the map. As example, I have different parcels and every parcel has a number. In the map, the parcels are labelled. In ...
1
vote
0answers
28 views

QGIS: automatic generalization

I'm trying to generalize my line features with QGIS. I've tried the "Generalizer"-Plugin, but can't get the results i want. I'd like to generalize my line as shown in the image. I've tried the ...
2
votes
1answer
52 views

GRASS: Landsat 8 GeoTIFF import error

I'm trying to import some Landsat 8 GeoTIFFs into GRASS (in QGIS), and I can't work out why I'm getting this error, or how to fix it. No amount of Googling has been able to tell me anything at all. I ...
0
votes
0answers
29 views

Is there a “1-band color raster color table” plugin substitute for QGIS 2.10?

I'm currently using QGIS 2.10 and I'm having some difficulties with creating color tables for raster files. I've been looking for the 1-band color raster color table plugin or something similar but ...
1
vote
0answers
15 views

Create and save composer with Python

With Qgis 2.8 I need to create some composers based ona template, and save them using Python. I've found how to load a template in a composition, but I do not find how to save this composition in the ...
0
votes
0answers
13 views

Gis2web - QGIS plugin troubles

I have QGIS 2.6.1 and when I want to get some results using gis2web (by Tom Chadwin) plugin, in fact, to get a webmap in OpenLayers, it seems that plugin doesn't work properly. E.g. I have a point ...
0
votes
1answer
26 views

r.report giving only per-class cell count

I'm trying to extract the count of each pixel value in a raster, like in this question: How to extract pixel value counts from a raster in QGIS? However, when I run r.report (from QGis (2.10) ...
2
votes
1answer
36 views

QGIS Contour Plugin Says No Shapely; can import shapely in QGIS console

I'm keen to create some contours (isochrones for a pedestrian 'ped-shed' catchment) from a point dataset in QGIS, using the contour plugin from the Plugins repository. I installed the plugin, but ...
0
votes
0answers
23 views

Missing items in DXF from QGIS export

I'm new to QGIS so this might be an easy answer. For my masterthesis I need contour lines of quite a large area. I imported an .asc file into qgis and used the contour command to get the contour ...
2
votes
0answers
16 views

QGIS TimeManager plugin: how to define the settings from the python console?

rather than defining interactively the 'Settings' of the QGIS Time Manager plugin, I would like to have the possibility to set them using the python console. This would save a lot of time in case one ...
0
votes
1answer
25 views

Checking the registration accuracy of already-orthorectified images

I acquired several Landsat 5-8 images corrected at Level 1T. I also have aerial ortophotos of the same area. From a visual assessment the co-registration between the images seems good, but I need to ...