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

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2
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1answer
76 views

Line Chart QGIS

I need a plugin or related which displays a line chart easily. I googled it, but nothing seems what I need. I have a K's Ripley table generated with R, which has one column with distance and other ...
2
votes
2answers
88 views

Is there function to know raster's size (KB) with python?

I am doing a script with python. There I have many raster in canvas (qgis) which I would like to know size in MB. I am searching function in python that give me this result. Anyone can help me? Thank ...
1
vote
0answers
24 views

How to handle QGIS Server: Failed to download capabilities?

i am trying to connect to Qgis Server (windows 7) in Qgis Browser but i get this error I have just installed Apache and the module "mod_fcgid.so"
1
vote
1answer
50 views

Using the Live tracking with internal GPS?

We have some Panasonic ToughPads (FZ-G1) with a GPS a module built in. I know where it is and can locate in it in COM 3 and it connects, registers a signal, shows satellite locations, but refuses to ...
2
votes
1answer
75 views

'QgsVectorDataProvider' object has no attribute 'select'

I want to create a tool layer in QGIS 2.4 that will select any vector features that intersect with that point. In my script I tried the following function: def selectFeature(self, point, button): ...
1
vote
3answers
44 views

Disconnect QGIS from database without closing the whole program

I'm making PostGIS queries to a GIS database from python and I'm using QGIS to visually check the results of my queries, but every time I want to run a new query I have to close QGIS because it keeps ...
1
vote
1answer
44 views

How to set an x-offset for my whole linestring/layer?

Supposing I have a layer imported from GeoServer succesfully, and it looks like this: (some will remember me from my previous question. And, yes, that is my city Volos, Greece. There is a map and a ...
1
vote
1answer
48 views

Calculate azimuth of vector for QGIS 2.0 Python plugin

I calculate the azimuth of a vector and update a field in my QGIS 2.0 Python 2.7 plugin. This works currently, but it takes much longer than i'd like to. I believe it is because i'm querying the data ...
1
vote
1answer
31 views

Adding shadedreliefarchive imagery to QGIS

I'm trying to add some relief imagery that is found at shadedreliefarchive.com Specifically, I'm trying to add the SEAsia one found here. I've tried making a custom CRS to match the details found on ...
1
vote
2answers
73 views

Create Intersecting lines and remove dangles

I have 3 cases shown in the image..In all of them i want to intersect the lines and remove dangles using python in Qgis python console so afterwards i can make a plugin for this work in qgis.In case 1 ...
1
vote
1answer
28 views

QGIS 2.0: Date Field for Custom Feature Form

I see a lot of posts regarding a customizable date field for a QGIS custom feature form such as this one and this one. I cannot bind my fields with a line edit, combo box, nor dateEdit. Is there any ...
0
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0answers
26 views

What Software Quality Control procedures used by QGIS developers?

Does anybody know of a link contains information about Software Quality Control procedures used by QGIS developers?
1
vote
0answers
44 views

QGIS print composer won't export map with base layer

I have a map that when I try and export it from the print composer to a jpeg, I get the map but the base layer has tiles with "map data not yet available". If I print from composer, it prints ...
2
votes
1answer
32 views

How to build custom CRS to export QGIS to Google Fusion Table

I want to export my layer from QGIS as a CSV to import it into google fusion tables. The problem is the qgis export for the geography column is in the wrong format for what google wants. QGIS ...
3
votes
1answer
57 views

Qtiles on QGIS + QGIS Server

I have just created some tiles on my project on QGIS with the plugin Qtiles; now I get several tiles in .png! My question is, how could put these tiles .png on QGIS Server? Is it possible?
2
votes
0answers
24 views

Project lines onto surface in QGIS

This question may already be answered so please point me in the right direction. I am designing a water distribution system for a rural village in Guatemala. I have created contours for the area. I ...
0
votes
0answers
24 views

Raster georeferrencing does not open in QGIS?

Windows 7 64 QGIS 2.4.0 I am new with QGIS (3 months). I can not open any more Raster georef I did reinstall QGIS without success with georef
2
votes
0answers
41 views

How do I use data from a zip file? [closed]

I am using QGIS 2.4 and how do I use data from a zip file.I am trying to add a layer of a base map for south africa into my workspace by am not getting any joy.
4
votes
1answer
77 views

How to split a line into a specific number of parts?

I've seen a lot of questions involving splitting a line with the help of a point layer. I want to split a line in fractions of its length. For example, I have a line 400 meters long, I want to split ...
2
votes
1answer
50 views

create polygons and fishnets of specific size and orientation and buffers

I want to study 6 areas in the field and in order to do so I want to divide each one of them into smaller areas/parts. What I would like to do is find an average square or rectangle area surface ...
1
vote
0answers
23 views

How can I configure composer to update all the elements when the project is opened?

I have designed standard layout to display a map, multiple tables, images, etc. Every time I open this project I have to update/refresh all the elements in the composer even if the layers have the ...
1
vote
0answers
36 views

QGIS 2.0 Catchment areas by using a 1 hour walking time

i would like to have catchment areas around my points which show the area of an one hour walk. I looked around and found information about using the hiking funktion for calculating a distance with the ...
2
votes
0answers
30 views

What are my options to handle Raster Clipper ERROR 6: ADRG driver doesn't support 4 bands?

I have a tif file which contains 4 bands (RGB + alpha). The clipper does not work and gave me the message below; ERROR 6: ADRG driver doesn't support 4 bands. Must be 3 (rgb) bands. Any patch file ...
1
vote
1answer
31 views

WMS layer in a QGIS 2.4 stand alone Python script

What is the best way to add a WMS layer on a map, in a stand-alone python script with QGIS 2.4? The methodology explained at the bottom of the official QGIS documentation page seems to be outdated and ...
1
vote
0answers
27 views

QGIS 2.4 Clip function in Raster layer Style Single band pseudocolour not working?

I've been using QGIS for a while and recently upgraded to 2.4, but now find that displaying raster layers is difficult. In particular, the clip function (tick box bottom left of "Style">"Singleband ...
3
votes
1answer
38 views

Export Raster Attribute Table using Open Source software

I've got 120 or so geotiff files that I'd like to build and export the raster attribute table to something a little more friendly (e.g. csv). I'm curious if there is an open source way to do this. ...
0
votes
0answers
16 views

Trouble with reading Leaf area index (LAI) Modis on QGIS

I am having trouble reading my Modis LAI data on QGIS. I imported my Modis hdf files and I used the QGIS raster calculator to apply the scale factor and all I get is a blank gray tile. My goal is to ...
4
votes
1answer
44 views

Loading same layers every time

I recently started using Qgis python console for Qgis development. My first task is to load the layer and print its attributes.I firstly load a point layer using code mylr = ...
3
votes
1answer
46 views

Zonal Statistics Tool on raster

I am working on a one-band raster with pixel values from 1 to 7, each representing a land-use class. I also have a grid of polygons and what I need is to obtain the percentage of each class in each ...
0
votes
0answers
13 views

PyQGIS: Coordinates to TextBrowser

I'm doing tutorial: http://www.qgisworkshop.org/html/workshop/plugins_tutorial.html#tie-qgspoint-output-to-the-gui Right now I at the "Tie QgsPoint Output to the GUI". I did everything similar to ...
2
votes
1answer
30 views

r.recode rules file issue

I have a raster that I want to reclassify and I'm using GRASS r.recode from within QGIS v.2.4.0. The rules file I am using has this content: 0:149:1 150:229:2 230:379:3 380:459:4 460:*:5 The raster ...
11
votes
1answer
113 views

Identify points in a shapefile that have no other point within x km with QGIS

This is probably a naive question but I am struggling as a new user to QGIS. I have a very large shapefile (275,000 points, but can break this into about 10 subregions if necessary for faster ...
2
votes
1answer
38 views

Plotting NAD83 zone 8 points atop OSM or Fusion Tables

A geologist has given me a bunch of points to plot on a map I'm doing in WGS84. Her points are in NAD83, and she says they're in "zone 8." Here is one of the points. 440244 7599457 She says the ...
4
votes
1answer
35 views

How do I consider entity alignment against slope direction?

I am a newbie to QGIS and don't know if the following is possible so would be grateful of any thoughts. I have a hill, most of which is given over to rectangular pasture fields. I hypothesize that ...
2
votes
0answers
28 views

Is it possible to sync multiple radio buttons on a QGIS 2.0 custom feature form?

Is it possible to sync multiple radio buttons on a QGIS 2.0 custom feature form to one attribute? For example i have three choices (owner, renter, and other) and choosing the radio button would fill ...
1
vote
1answer
42 views

how to open shp file which created by using python-ogr in qgis?

I have done following steps, so how I open that created shp file in Qgis driver=ogr.GetDriverByName('ESRI Shapefile') out=driver.CreateDataSource('pts.shp') ...
2
votes
1answer
33 views

How to define QgsVectorLayer by QDomNode?

I am using QGIS 2.4, Python 2.7.5, win 8.1. I am trying to read layers from QGIS project. When I try define QgsVectorLayer using QDomNode and readXML function, following error appears: ...
2
votes
0answers
33 views

Changing grid orientation of a raster

I'm trying to load some XYZ data into a program called OpendTect. However, the orientation of the existing data is different from the grid orientation of the XYZ file. this makes it imposible to load ...
1
vote
3answers
100 views

How to export streets in a certain area from one shapefile to a new shapefile?

I have a shapefile with the roads from Europe and I want to export in a new shapefile only the roads from Greece. I tried to delete the other roads but there are too many and I have no attribute to ...
1
vote
1answer
60 views

Suitability Analysis using QGIS? [closed]

I want to do an overlay analysis to find most suitable locations to live in an area. My criteria are road network, water lines, hospital locations, and schools. My steps are: Convert all layers to ...
1
vote
0answers
41 views

Is QGIS Server Properly Installed?

I just installed qgis server using the instructions provided here. I am pretty sure that I have installed QGIS properly, but I am not sure. I am using Windows 7, and XAMPP. I typed the following into ...
1
vote
1answer
21 views

Flow mapper not working

Hi I am trying to run the test files for flow mapper plugin in QGIS but I run into an error message.
4
votes
2answers
100 views

Split lines at intersection points

I've got some linestrings covering a road network, and need to split them at the crossroads. Does anybody have any idea on how to do it? I'm using QGIS 2.4, with a Postgis 2.1.3.
2
votes
1answer
40 views

Compiling custom plugins for QGIS on Windows

I've made my first plugin using plugin builder and I want to compile it. I read that I need two commands to do it under windows: pyuic4 and pyrcc4. But when I use any of these commands I get this: ...
2
votes
1answer
44 views

QGIS reference system problem

I'm working with Quantum GIS 2.4 and I would like to overlap a DTM (.asc) and a shapefile. The shapefile is a copy from the another, to make some trials, who had WGS84 as original CRS; I saved it by ...
1
vote
0answers
37 views

How to change color ramp in graduated classification with standard deviation using pyqgis

I'm using graduated clasiffication with standard deviation to style my shapefile (see code below). But I need to use different color ramp for classes below mean (-1std, -2std etc.).I'm thinking of ...
3
votes
2answers
93 views

Create grid where points is centroid? QGIS

I want a grid around my points(100 x 100 m), where points are center. Creating a grid from Vector -->Researh Tools--> Vector Grid creates grid, but not centered around my points How do I do this? ...
3
votes
3answers
100 views

Is there a union function for multiple layers comparable to ArcGIS in open source GIS like QGIS?

I need a union function for a lot of polygon layers (protected areas of all kind, nature, water etc.) comparable to the union function in ArcGIS. I have only the desktop version from ArcGIS and so it ...
1
vote
1answer
28 views

Speeding up length calculation in QGIS 2.0 Python plugin

In a qgis 2.0 plugin for windows, I calculate length and update a field with the values. It works, but takes a lot of time. Execution for this part only takes about ten minutes. Can anyone suggest ...
2
votes
1answer
33 views

Why is too long connecting to Oracle Spatial database from QGIS client?

I am having trouble connecting to an Oracle Spatial data with QGIS client. I use QGIS Version 2.2 (Valmiera) to connect to a database schema in Oracle Spatial. I asked our DBA access to our database ...