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

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1answer
119 views

How to change QGIS install paths on Windows?

I will be installing QGIS on client machines soon, and we need to have the .qgis2 folder on the D:\ and not to C. (Windows 7) Is there a way at install time to have it moved to a specific location? ...
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1answer
182 views

QGIS web client - ERROR generating pdf under Windows

If I push the print Button at the toolbar, i will get the menu which works fine. But then i want to print the map the pdf doesn't generate. That's why i look into firebug and i get following ...
2
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0answers
100 views

Not able to get the PostGIS Layer Viewer running in pgAdmin or command line

I've installed PostGIS Layer Viewer as a plugin for pgAdmin. I've downloaded postgis_viewer.py from the official repository on GitHub! and followed the install instructions described on Web site!. ...
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0answers
25 views

QGIS Summarize entries by a column [duplicate]

My big problem is as folows: I have one field named (OBID) identificator of an municipal. Second field is ZAPOSL which indicates the number of employees in several stores in this municipal. I wolud ...
2
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0answers
85 views

ESRI/Mapinfo MGA56 prj vs QGIS MGA56 prj

I am trying to understand why the degree unit is different between ESRI/Mapinfo and QGIS: ESRI/Mapinfo ...
2
votes
1answer
134 views

QGIS Python - raster as point layer, coordinates issues

I would like to create point layer for storing values retrieved from a raster file. My idea was to iterate through all raster cells. If cell value is different than NULL, I wish to create a new point ...
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0answers
120 views

QGIS: How to displace points close to each other (but not overlapping) and save as a layer?

I'm preparing a point vector file for printing, and I would like to displace the points within it so that the markers will be far enough apart that they do not overlap. I am not using QGIS to render ...
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0answers
25 views

Error adding feature to centroids in QGIS [closed]

I want to map forest stands. I have the compartments as centroids and I am trying to add a feature by snapping to them and creating polygons. Each time I click, however, it displays a box titled ...
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1answer
132 views

Is it possible to write a pyQt5 plugin for QGIS 2.8?

I have just installed QGIS 2.8 and the changelog says Qt5 is now supported in QGIS 2.8. Can anyone say me if is it possible to write a pyQt5 plugin for QGIS 2.8? Has anyone tried to do this?
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0answers
24 views

how to create shapes for each node in network based on azimuth [duplicate]

I am new to QGIS. (I used Esri Arc more than 10 years ago). I have several thousand points on a map. Each point has an associated azimuth it points and a variable wedge it covers; ie it points at an ...
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0answers
62 views

PyQGIS - Syntax for importing WKT file

I couldn't find any proper example of how to import a .csv with WKT coordinates (Polygon) in PyQGIS. Here are more details on my .csv. I am working with polygons. The delimiter is a semi colum, and ...
2
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0answers
644 views

Running Python outside of QGIS - (ImportError: No module named qgis.core)

I'm trying to run simple scripts on QGIS from outside the QGIS environment - as here How to run a simple python script for QGIS from outside (e.g. Sublime Text)? My code: import sys ...
3
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1answer
124 views

Is there a way to create multipart from singlepart features based on selected features only?

QGIS has a tool for creating multipart features in the Geometry Tools section. However, this is applied to a whole layer, which leads to the yellow selection in the image below when used (selecting ...
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2answers
105 views

How to open a layer in QGIS from another application?

Let's say I have some metadata about a layer stored in some custom application, and I would like to open or view the layer in QGIS. What, if any, are my options? Edit: formats include shp, wms, ...
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1answer
110 views

Plotting two Maps on one sheet in QGIS?

I am trying to put two different maps on one sheet, one of them should show the raster image of a survey, the other one the vector-rendering of anomalies of the same area, but without the raster ...
3
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0answers
222 views

Performance difference between focal statistics (ArcGIS) and neighbor (GRAS or QGIS)

I tested minimum, maximum, and average neighbor (circle radius = 161 pixel) using ArcGIS, GRASS and QGIS: ArcGIS (10.1): it takes only one minute GRASS (6.4.3): it takes 123 minutes for every output ...
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1answer
102 views

Georeferencing Old Mining Maps (Floetzkarte des Oberschlesische) in QGIS?

I am trying to georeference some old mining maps (Floetzkarte des Oberschlesische) in QGIS 2.9. I have already tried to do that by marking known points on present satelite photos, but the results were ...
3
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0answers
94 views

QGIS atlas generation - batch process for many atlases

I have many different QGIS projects, each one is designed to create one particular atlas or map book in pdf format (one different book per every QGIS project). Month by month I must actualize each ...
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0answers
68 views

Why would Nearest Neighbor Analysis give 0 observed mean distance?

I am working with small datasets (around 100 points or less) with Nearest Neighbor Analysis in QGIS 2.8 (although I also tested in 2.6 and the result is the same). I have the layers referenced with a ...
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0answers
148 views

Add Surface Information alternatives in QGIS?

Is anyone aware of a single tool or possible routine of tools in QGIS (2.6) which emulate the results of the ESRI 3D Analyst tool 'Add Surface Information'? I have several polygon shapefiles (some ...
2
votes
3answers
320 views

QGIS - Geocoding addresses to coordinates

I've got an Excel file which includes known locations with their exact address (street, house number, city, state). This Excel file does not have a geographical column. Also, I have a .shp file inside ...
5
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3answers
90 views

Is it possible to have the attributes fields already filled from the previous object?

I need to create a lot of points with lots of attributes, but most of the fields are the same, so I don't want to edit all the fields all the time. Is there a "remember previous fields" function ...
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0answers
71 views

How to convert points distribution toward surface information?

I'm working with QGIS 2.6 I have a points layer representing different bus and train stops. I applied a categorized symbology; each colour represents a class of value (field regarding time access ...
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0answers
178 views

How to change symbol size in QGIS map composer legend?

I need to set an identical size to several symbols inside a QGIS map composer legend. The 'Symbol' menu in the Legend properties allows to set a height and width but this has no effect on the size of ...
3
votes
1answer
46 views

Generate a raster with a uniform value using QGis

I'm working on a project using the qgis-modeler and i want generate a raster with a uniform value. i'm using r.surf.random function of GRASS which need min and max value but i want have only one ...
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1answer
221 views

I want to compare multiple raster layers against each other to identify changes in pixel values over time

I am using LAI values to assess vegetation growth over large areas. I want to be able to identify areas that are doing well and areas that are decreasing based on the changes in pixel values. Ideally ...
5
votes
1answer
126 views

QGIS and the South Pole: bug or feature?

I am trying to work with some data from Antarctica in QGIS. I have defined this new projection: +proj=laea +lat_0=-90 +lon_0=0 +datum=WGS84 +units=m +no_defs And started adding a few vector layers. ...
0
votes
1answer
82 views

Radiometric Indices error

I have successfully included otbApplicaton in my python code. Tested the otb inclusion it is working fine. I am using the following code to generate NDVI output from the landsat image. from sys ...
1
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1answer
166 views

qgis refresh button for attributeactions

QgsVectorLayer* vLyr=static_cast<QgsVectorLayer*>(aktLayer->qgsLayer); vLyr->actions()->addAction(QgsAction::ActionType::OpenUrl, "Link im Webbrowser öffnen", "[% "+sAttribute+" %]" , ...
2
votes
1answer
145 views

How to update a column in a layer with NULL currently to nearby value in QGIS?

Currently I have a layer with construction year attributes in it. Not all of these are filled out and I figure it is reasonable to update them with the construction year of the nearby elements as they ...
3
votes
1answer
132 views

Misalignment of EPSG:4326 and EPSG:3399 coordinates

I'm having a QGIS project in local coordinates (Gauss-Kruger, EPSG:3399) with some layers in the same reference system. On top of that, I want to display point coordinates, which I digitized using ...
0
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1answer
44 views

Problem calling qgis2leaf outside the QGIS

I am a computer programmer starting with PyqGis-Python, and I’d need to automatize the creation of a webmap using the plugin of qgis2leaf from a QGIS Project. I have reached to call “import ...
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3answers
989 views

Is it possible to perform automatic snapping of polygons in QGIS or ArcGIS?

Note: in the picture below white space between the polygons is blank space – it does not contain any polygons as a result of Intersect or Union functions.
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0answers
60 views

qgis Points data from KML file

Forgive me if this question has been asked before. My search of the site did not turn up anything relevant, so I decided to ask this question. I have a KML file with Waypoints and several Tracks in ...
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0answers
40 views

Multi Label with Multi Placement

is there any way to add multiple label at different placement in qgis. Suppose I have a vector layer for line geometry and my attribute are name and route number. Now i want to add the route number to ...
2
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2answers
330 views

How to use `layer.getFeatures()` in a standalone script?

I am following the QGIS Cookbook and this post where it concerns reading attributes from layers. I would like to exploit this method and implement it into a standalone script. Essentially, I want to ...
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0answers
20 views

Error in projection Qgis [duplicate]

qGIS- when I try to project using +proj=robin +lon_0=-150 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs In order to centre on the Pacific I get this: Any advice? Thank you!
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0answers
325 views

How can I export symbology and labels with QGIS Leaflet to webmap?

If I make a map in QGIS export it with Leaflet the symbology and labels don't appear on the webmap. Is it possible to export them? If yes, how to export the all map?
2
votes
1answer
168 views

use gdal python bindings from the QGIS folder in a custom script

I have QGIS installed (on Windows) and can import this line from the QGIS Python console: from osgeo import gdal When I try the import in a python file it doesn't work Traceback (most recent call ...
0
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1answer
101 views

Resolution problem

I have a Landsat TM image and in QGIS I used Clipper to crop my image. Then, I tried to reprojected it via Warp (Reproject) and the pixel size goes 29.9936,-29.9936. I do not understand why this ...
2
votes
2answers
233 views

Change line into multiple segments where they overlap with nodes and vertex (qgis)

I have one (very) long line (e.g. line 2) I also have another line (line 3) which nodes are snapped with two vertexes of line 2. I want to break line 2 up in three segments. Is this possible by using ...
2
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0answers
109 views

Error while loading shared libraries libqgis_core.2.9.0

I have complied QGIS version 2.8.1 from source, according to the instructions from https://github.com/qgis/QGIS/blob/master/INSTALL Now after successfully running ccmake .., make and make install ...
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votes
2answers
78 views

Fractional Area Calculation

I have a file (in both raster and vector) of different districts in a country. I have also made a grid of 1 deg * 1 deg (both vector and raster) of the country. I want to calculate the area of each ...
0
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0answers
20 views

Grouping layers in QGIS? [duplicate]

I'm trying to group a large amount of layers together. They are a mix of Polygons and Points, I would like to create individual groups by the layer's name. Anyone have any ideas?
3
votes
2answers
246 views

Can't export customer's shapefile to latitude and longitude

I'm very new to this application so bear with me. I hope that I am missing something very elementary. I have a shapefile supplied by my customer. I need to get the latitude and longitude for each ...
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0answers
60 views

Gradient fill based on scores (similar to elevation)

I'm rather new to using GIS (QGIS, specifically). I've mapped out a cohort of around 550 patients across Long Island, New York based on their full address by using MMQGIS plugin. This data is ...
0
votes
1answer
148 views

Creating slippy map from large shapefiles? [duplicate]

I am trying to create a map of the UK based on a number of open data sources (Ordnance Survey Open Data, OSM, some CSV files etc). My end goal is to create a map of the whole of the UK that I can ...
5
votes
2answers
774 views

How to digitize building footprints with orthogonal edges?

Using QGIS, I am trying to digitize an old raster map, and because I ultimately want to load these 2d layers into sketch-up to turn into 3D models, I need everything to be square. Here's a sample of ...
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0answers
297 views

ECW support for QGIS 2.8 (Wien) and Ubuntu 14.10 (Utopic Unicorn) [duplicate]

Getting QGIS 2.8 (Ubuntu 14.10) ready for ECW files is really a pain. I've no terminal experience and it took me several hours to install the ECW JPEG 2000 SDK 3.3. What I did so far: #download ECW ...
5
votes
2answers
627 views

How to add a legend to a canvas in a standalone PyQGIS application?

I am trying to develop a standalone PyQGIS application. The map display does not pose any problems, but I do not know how to add a legend to the canvas.