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

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3answers
20 views

Qgis Shapefile Lines contain no data in Attribute Table

I am trying to make a shapefile line contain all the data that the GPX file has. So i load the gpx file into Qgis, (prompts me for tracks, waypoints, trackpoints, routes, etc) When i choose ...
2
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1answer
26 views

How to build a query/expression to select specific points within a buffer? (in QGIS)

I have a point layer in QGIS. Each point represents a tree and each tree has information about its height as an attribute. I would like to build a query/expression to select all those trees that have ...
1
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1answer
13 views

export more than one but not all attributes with qgis2web

Using the qgis2web plugin: Is it possible to select more than one but not all attributes to be shown as popup? I can select all attributes or only one attribute to be shown. but not for example two ...
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0answers
6 views

module object has no attribute classFactory

I asked this question several days ago on the QGIS developer list but didn't get any love. I'm hoping someone can help me resolve this error. I have a custom repo and a custom plugin that I'm ...
0
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0answers
10 views

GRASS unable to download any extension from GRASS Addons

I'm trying to install some add-ons to GRASS, but each time I try to download an addon, I'm getting the same error: g.extension.py extension=v.autokrige ...
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0answers
5 views

raster doesn't redraw to fit the canvas after a zoom in and a pan

i am working with qgis 2.8.2, c++ api and qt 4.8.5 i have a layer in the mapcanvas, this layer contains a raster ( a georef tif picture ) when i zoom in, the raster fill the entire canvas , ok but if ...
2
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1answer
15 views

In QGIS combine multiple polygon parts of a single feature

This is a repost of my unsolved QGIS dilema. The image shows a single selected feature that consists of two polygons and the corresponding attribute table. Some nodes of the left poly have been ...
3
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1answer
23 views

How to toggle group visibility in QGIS using Python?

I've tried this, but it doesn't work out. root = QgsProject.instance().layerTreeRoot() group1 = root.insertGroup(0, "PGB") legend = i.legendInterface() legend.isGroupVisible(group1) ...
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0answers
21 views

Building QGIS 2.8.6 on Win 7 32bit?

I'm trying to build QGIS 2.8.6 on Windows 7 32 bit using MSVC Express 10. The build process completes without errors, but with a bunch of warnings. When I run the qgis.exe after installation, it only ...
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2answers
53 views

CRS is not correct, how to define it?

I have the correct coordinates in a excel file, but when I import the file, the point always goes to the wrong place. (I need it in Croatia, and it puts the point in Africa) I've tried chaging CRS ...
1
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0answers
13 views

distributing QGIS via OPSI

Is anyone experienced in distributing QGIS via OPSI (Open PC server integration, http://www.opsi.org/en)? I think this requires an msi package, has anyone built one from the qgis.exe installer?
2
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1answer
143 views

What algorithm does QGIS use to calculate Nearest Neighbor Index?

I'm carrying out nearest neighbor analysis on a set of geological features in QGIS, trying to find out whether they're clustered or not. I've calculated the nearest neighbor distances using the ...
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1answer
30 views

How to quickly change EPSG in QGIS (Openlayers; 4326 vs. 3857)

I'm using Qgis 2.12.2-Lyon on Ubuntu 14.04 LTS. With the OpenLayers plugin I added some OpenLayers to my Canvas. I usually use the WGS 84 (EPSG:4326) projection for my project, but I have to switch ...
0
votes
1answer
25 views

Error with brush style while working with Qgis2leaf

I am getting following error while working with QGIS2leaf. it saying that QgsSimpleLineSymbolLayerV2' object has no attribute 'brushStyle'. I didn't understand why its coming . Full error what i am ...
1
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1answer
36 views

Color gradients to show direction in polylines

I am referring to this very useful hack to change the color gradient of buffered polygons in order to show direction (with a gradient from red to green, for example) hack The only problem is that ...
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0answers
36 views

Add a Delimited Text Layer in QGIS [duplicate]

Does anyone know how to put manually decimal coordinates in QGIS 2.12.3 Lyon? I have the georeferenced topographic map. I've tried to add feature point and then change the coordinates of the point but ...
3
votes
1answer
24 views

How to make a line shapefile converted from a gpx track file display over basemaps such as OpenStreetMap?

I have created a line shapefile from a Garmin gpx track file using QGIS 1.12.3 Lyon. Resultant vector file displays properly with other vector shapefiles. Problem is that created vector file (line ...
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1answer
27 views

Point in Polygon: Aggregation does not work

I'm working with these data: click here. The task is actually pretty simple but somehow it won't work properly. I have a point and a polygon layer. In most polygons there are a couple of points. The ...
1
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0answers
12 views

Export/print QGis: dismatching OSM data on an OSM-layer

On QGIS (2.10, winXP). is there any known problem by exporting or printing .osm-data (from JOSM) onto an Openstreetmap-Mapnik-layer? The imported waypoints always shift from the left less and less ...
2
votes
1answer
55 views

Concatenate values using spatial join in QGIS?

I have a layer (SQLlite) of city lots and would like to accomplish the following: For each city lot, concatenate the list of unique lot id's which are bound within a radius of 30m from the given ...
4
votes
3answers
18 views

gdalwarp to geographic coordinate system

I'm getting the folllowing Error when trying to re-project a raster from NAD_1983_Albers to GCS_North_American_1983. I used the proj4 defenition from going to Properties in QGIS of the layer whose ...
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0answers
19 views

Foreign Key error, creating new splite db?

Attempting to use a plugin in QGIS (midvatten) that utilizes splite. I am attempting to create a db in a different EPSG than the plug in defaults to, im getting "foreign key constraint failed" as my ...
2
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1answer
29 views

How to import a digital elevation model in Germany Gauss Krüger from .dat file?

i am very new to qgis. I want to create a hillshade file and also calculate the inclination. The structure of the digital elevation model data looks like this: 5390.0125 5659.9875 251.8 5390.0125 ...
2
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0answers
29 views

Buffer for network roads in QGIS [duplicate]

How can I create "buffers" or vector from values ​​from a layer of points, where the "buffers" are "tied" to the streets? Example: A bus station, I would like to create vectors within 100 m range ...
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2answers
23 views

Isochrones for public transport [on hold]

Is there a way to compute isochrones for public transport while using the plug-ins available in QGIS? Or is there another way for making them? Note: I am not a software engineer which means that some ...
-1
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0answers
25 views

QGIS 2.2 - Split line feature at node [on hold]

I've tried several times to split a line by feature and by parts on a node but I haven't got the expected result. What should I do?
1
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1answer
21 views

How to add legend in Qgis2Web plugin while exporting maps?

currently i am working with the publishing web maps with the Qgis2web plugin. but i didn't find any kind of legend window or event to add legend. Is there any other source to add Legend?below is ...
1
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1answer
23 views

Pattern fill for raster contours in QGIS

How do I fill the area within raster contours with a pattern fill, instead of colors in QGIS? Is this even possible?
0
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1answer
19 views

Unable to export map in Qgis2leaf

I am trying to make web map with the help of Qgis2leaf plug in. i added all layer to be plot but when i clicked on OK after setting all parameters i am getting Python coding error. Here i am attaching ...
1
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1answer
52 views

Virtual fields are lost when duplicate layers

I've just upgraded to QGIS 2.12.3 - and hoped that the issue which was really time-consuming in 2.12. <3 could have been solved ... On duplicating layer - with tons of joined tables and virtual ...
2
votes
1answer
36 views

QGIS - PYQGIS Import gpx as vector layer

I'm trying to use the python console to import some gpx files as vector layers. When I do it manually I have to choose which layers to add, my options are: I've tried various versions of the code ...
2
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1answer
24 views

QGIS: Only view raster data within polygon

So i have this raster dataset in .ASC-format. I defined a bounding box polygon of my study area: Now i want QGIS to only show the raster data within this boundary box without changing/adapting the ...
1
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0answers
21 views

How can I connect seven schools worldwide to create and share QGIS projects? [on hold]

I am looking at a possible programme to connect seven schools ( all English capable ) located around the world to set up and share QGIS data and projects about their own local area among the group. ...
2
votes
0answers
29 views

Z values in kml

My goal is to create a KML line and/or polygon where the z-values of the vertices equal the z-values from point data (where the csv has a Z field). So far, I have created a spreadsheet which, given a ...
6
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0answers
39 views

Project an attribute from one polygon layer to another

I have 2 polygon layers which can be found here. The two layers are overlapping. The first contains a map of the German counties in 1928 and the second the counties how they are in 2014. The 2014 ...
4
votes
1answer
29 views

Edit polygon borders in QGIS preserving topological correctness (planar partition)

Given a layer of polygons that is topologically perfect, i.e., has no overlaps or gaps between the polygons, is it possible to manually edit the edges of the polygons in QGIS in a way that preserves ...
1
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1answer
22 views

How to dissolve polygons that overlap both on each other in QGIS?

I have two layers of polygons with landcover classes(meadows, cropland, forest, ect) They overlap in both directions, i.e like a zipper. I need to dissolve them by one attribute (Class) so I can have ...
2
votes
1answer
37 views

QGIS2Web - how to include additional mapping functions

It is my understanding that the QGIS2Web generates a web map from my QGIS project by taking aspects of layers, styles and extent. What would it take to include map functionality to the web map such ...
1
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0answers
12 views

Change pixel size of 30m for 23.5m in QGIS [duplicate]

I need to change pixel size in raster file file with Pixel Size = (28.086057277202915,-28.086057277202915) using Qgis for Pixel Size = (23.951601289061028,-23.952379920305706) what kind of function I ...
2
votes
0answers
21 views

QGIS 2.12.1 crashes on Mac OSX-11 because of Incompatible PROJ library version

I have just installed QGIS 2.12.1 on my mac OSX-11 El Capitan and all relevant libraries - on running QGIS and loading a previous project the program shuts down. The error reported is: Dyld Error ...
1
vote
2answers
37 views

What PostgreSQL version to use with QGIS 2.8 (on Linux/Fedora 21)

I'm looking to install QGIS on my Linux/Fedora 21 laptop. QGIS ver. 2.8 seems to be the new/stable version (Feb. 2016) What PostgreSQL version should I use with that?
2
votes
1answer
32 views

forest classification using SCP and QGIS

I am using QGIS 2.8.6 and I want to use SCP for forest classification from Landsat 8 oli. I have already installed the SPP plugin. What else do I need to install for operation of the software?
5
votes
2answers
366 views

Does QGIS have any plugin to work with WhatThreeWords?

Does QGIS have any plugin to work with the WhatThreeWords mapping project? If not now, are there any plugins in process?
5
votes
1answer
46 views

How to measure angle in QGIS

While measuring an angle in QGIS using measure angle tool, it is showing as 0 to 180 degree for clockwise direction and -1 to -179 for anticlockwise. What I need is, interior angle between vertices of ...
2
votes
2answers
104 views

How to label one point bigger than all others in a layer?

I have a point dataset in one layer. I labelled all points but I would like to label one point larger size than other point labels. How can I do it? Merzifon and Bahçecik are in the same point ...
0
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1answer
48 views

QGIS loop/iterator with python in function editor (field calculator)

I am trying to create a loop to rename the fields of my attribute table. The fields should start at 1 and increment by one until the end of the table (e.g. 1,2,3,4,5,...,n) my code on the python ...
4
votes
2answers
55 views

How to merge and dissolve adjacent polygons and sum up their attributes in QGIS?

I have many polygons that are adjacent to each other, and others overlap slightly. I need to merge them and sum up their attribute (Area per class). I attach an image of my problem (Screenshot of my ...
4
votes
0answers
47 views

Calculating angle using three WGS 84 points

I am looking for a way to calculate an angle between two points at a specific third point. My coordinate system is WGS 84. I can measure the angle with QGIS clicken on those three points, but I want ...
0
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0answers
25 views

GDB for offline viewer

I'm newbie for geographic information systems, I want to build Mapping offline. I have data with GDB file, before i use map source to open that file and we can view online in google earth, but now i ...
2
votes
0answers
19 views

Problem with adding non spatial view from MSSQL to QGIS

I have QGIS 2.12.3 app installed on one server (servername1) and MSSQL server database installed on servername2. The database is password protected and I have made connection successfully using QGIS ...