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

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4
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64 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 ...
4
votes
0answers
60 views

QGIS Atlas: Filter maps based on attributes (more than one)?

I have a series of maps with the same geographic boundaries but with different set of points (from the same layer). I would like to create an Atlas where the change is based on the attributes. A ...
4
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72 views

Can I clip a geodatabase vector layer in QGIS?

I have a Vector layer loaded from a .gdb (geodatabase directory). I'm seeing my contour lines fine. I've drawn a polygon on top of the area I want to crop on a new layer. I select Geoprocessing ...
4
votes
0answers
127 views

Different styles in same label

I have a multiline label made of 3 attributes made through an expression like: "Length" || '/' || "Level" || '/' || '→ ' || "Bearing" || ' ←' I'd like to make the Length and Level lines in ...
4
votes
0answers
72 views

QGIS Profile Tool shows no profile

I have installed and followed the process to produce an elevation profile from the Route Profile plug-in in QGIS, but for some reason I am getting no profile to appear. The grids are from OS ...
4
votes
0answers
79 views

Custom forms feature in QGIS: QMessageBox.warning closes QDialog as well

I am attempting to work with custom forms in QGIS. I have included a validate function in my code that will pop a QMessageBox() if the validation fails. My problem is that when I close the QMessageBox ...
4
votes
0answers
45 views

Combine multiple adjoining parts of a single feature

In QGIS, one polygon feature resulted from merger of several adjacent polygons. This one new polygon feature has a single line through it that I would like to eliminate. When hovering over individual ...
4
votes
0answers
76 views

OS terrain 50: .vrt from zip files

I tried to follow what was suggested in How to use OS Terrain 50 in QGIS, but I got the following problem: in spite of being generally able to generate .vrt files using gdalbuildvrt from unzipped ....
4
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0answers
39 views

Stretch to MinMax results in blank render output in QGIS?

I am a new QGIS user, and I can't figure out if I encountered a bug. If I have a multi-layer image, and "Multiband color" -> "Stretch to MinMax" selected I get the following behaviour. QGIS takes a ...
4
votes
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57 views

Positional accuracy assessment methods in qgis

I'm doing an quality assessment of openstreetmap's street data. As a comparism dataset I have to use an administrative dataset, which is highly accurate and comes in polygons. Here's a sneak peek: ...
4
votes
0answers
82 views

QGIS 2.10 Can't load georeference plugin?

Apparently my problem was already present in older versions of Qgis. I don't know how to fix it, knowing I have a Linux system (Fedora 23). Somethiing similar here : Where to download QGIS 2.10? So, ...
4
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0answers
71 views

Buffer neighbouring polygons without overlap using QGIS

Is it possible to create a buffer around neighbouring polygons, so that the new polygons do not overlap? Preferably in QGIS but any other tool will do. So instead of the first result I would like ...
4
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0answers
47 views

QGIS Georeferencer is stretching image

I'm trying to Georeference an image. I've followed the guide from QGIS, but for some reason, it's stretching, and offsetting the image from the points. For example, my input of the southwest corner ...
4
votes
0answers
31 views

Center my contour values in QGIS

In QGIS have an issue with my contour value labels being pushed to the edge of my map, instead of lining up at the center where they seem to have more space. Does anyone know why this happens for some ...
4
votes
0answers
249 views

“Error” on Advanced Digitizing Window in QGIS

I have the word "Error" that has appeared on my Advanced Digitizing Panel since upgrading to QGIS 2.12.0 Lyon. It doesn't appear to actually affect anything negatively... has anyone else seen this or ...
4
votes
0answers
74 views

SAGA Tool in QGIS Error: Load table: Proj.4-WKT Dictionary… failed

I have some problems with running SAGA tools in QGIS. I've downloaded and installed the software via the OSGeo4W Installer. It downloaded QGIS 2.12 and Saga 2.1.2. I wanted to use the Tool "Shapes To ...
4
votes
0answers
217 views

How can I properly rename a table in a SpatiaLite DB?

Spatial layers (tables) in SpatiaLite include various supporting objects and metadata, including triggers, indices, and entries in (at minimum) the geometry_columns table. I'm looking for (preferably) ...
4
votes
0answers
241 views

QGIS 2.10.1 & SQL Server 2014

I'm struggling to load spatial data into QGIS from SQL Server 2014. I have a table with 4 geography columns (3 are polygon layers, one is a point layer). The table has a primary key column that is a ...
4
votes
0answers
111 views

Integrating numeric scales into a text or HTML box in QGIS print composer.

I am trying to embed the scale of a map in the print composer expression builder or HTML frame. Effectively the value of the scale in the map item properties would come through into the text and be ...
4
votes
0answers
509 views

QGIS on UHD screen

I've got a new laptop that came with a 4k UHD screen. The GUI on QGIS doesn't scale well making most of the menu elements too small to easily see. Is there a way to change the scale of the gui?
4
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232 views

QGIS procedure for Multidirectional, oblique-weighted, shaded-relief?

Is QGIS capable of the multidirectional, oblique-weighted,shaded-relief method described at http://pubs.usgs.gov/of/1992/of92-422/of92-422.pdf ? If so, what are the steps necessary in QGIS to ...
4
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0answers
335 views

Error when using r.watershed in QGIS 2.10.1 with Grass

I am running r.watershed within QGIS processing the I get the error below. I draw your attention to: GRASS_INFO_WARNING(2205,1): Subprocess failed with exit code 256 GRASS_INFO_END(2205,1) ...
4
votes
0answers
701 views

Connect to QGIS 2.6 Python Plugin function via button on custom feature form

I am trying to connect to a QGIS 2.6 Python plugin function via a custom feature form button. On my feature form, I'm attempting to do a few things : enable the updateButton only if the ...
4
votes
0answers
266 views

How to digitize in stream mode in QGIS, using a tablet?

How to digitize in stream mode in Qgis, using a wacom cintiq tablet? freehand it's no use. i need something like MNDR stream digitizing extension for arcview 3.x, which allows continuous tracing, ...
4
votes
0answers
127 views

Merge Raster Layer Specific Order in Graphic Modeler

I'm using the Graphic Modeler/Processing Modeler to automate a process. The last step in this process is Merging three different Raster Layers. I'm using the "Merge Raster Layers" from Saga 2.0.8. Is ...
4
votes
0answers
102 views

Is it possible in QGIS print composer to include a numeric scale in an html box?

For work I always have to create a table with my name, project name, date etc. into my map layouts. I also need to include the scale like "1:150000" in that table. So far I am solving that by ...
4
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0answers
165 views

How to set posgis default sequential value in a QGIS “editable” view?

Introduction In a QGIS project I have a VIEW, that I want to became editable (I'm trying to replicate the versioning system used DB Manager with some tweeks). Therefore I created a few rules to ...
4
votes
0answers
1k views

Why can't QGIS connect to MS SQL Server?

All, Up until yesterday, QGIS connected to my SQL Server 2012 database no problem. However, yesterday I installed SQL Server Management Studio (SSMS), and the SQL Server Client tools, and now I get ...
4
votes
0answers
358 views

Display a color ramp legend (of a vector layer) in the qgis map composer

I would like to have a color ramp instead of 10 categories of color when displaying my vector layer in the map composer of QGIS. Is it possible ?
4
votes
0answers
414 views

How to debug Quantum GIS PlugIn Visual Studio DLL?

I have developed a Quantum GIS plugin layer using Microsoft Visual studio and placed it in my plugins folder of my customized QGIS application. I now intend to debug the DLL using Microsoft Studio. ...
3
votes
0answers
25 views

Rasterize in QGIS using point as centroid (not vertex)

I'm attempting to make the full switch from ArcGIS to QGIS, but there are a few snags I'm hitting along the way, one of which is in the GDAL "Rasterize" function. My process goes like this: I have a ...
3
votes
0answers
47 views

QGIS QgsAttributeTableModel only loads when called without a function in Python

I tried to load QgsAttributeTableModel into QgsAttributeTableView or a plain Qt QTableView but it could run from inside a class method or function but it runs without any function or method. Below is ...
3
votes
0answers
45 views

How to use the 'Check Geometries' plugin for polygons?

I've a few hundred polygon features with many duplicate nodes, gaps, overlaps and other geometry errors. Fixing all errors seems to be quite tricky. I had to run the duplicate nodes check twice to fix ...
3
votes
0answers
30 views

How to access qgis module from my virtualenv

I am running an Ubuntu 14.4 and I have installed a python virtual environment. Then I pip installed several python libraries (gdal, lxml, psycopg2 etc.) Also in my system I have the module for qgis. ...
3
votes
0answers
45 views

Python QGIS crashes within categorized renderer setup

I'm hassling around with QGIS renderer definitions in python with QGIS 2.8 at debian wheezy. At least I want simply build step by step a categorized renderer to fill a polygon. The script crashes, ...
3
votes
0answers
39 views

Style rule based on feature adjacency?

Is there a way in QGIS to use an expression to define a polygon feature's color based on whether it's adjacent to other features? I would like to achieve something like the following: -If a feature ...
3
votes
0answers
53 views

How to handle large tables in QGIS using python?

I'm currently writing a plugin that calculates values based on a QgsVectorLayer's attributes. To display and print the values I'm using a QgsComposerTextTableV2. I have several problems with my ...
3
votes
0answers
47 views

Using dynamic terrain in cesium?

I've been looking into tools for displaying dynamic terrain (x,y,z(t)) via the browser and I just recently came across cesium.js which looks like a wonderful tool at first glance. Many of the demos ...
3
votes
0answers
35 views

Creating a virtual raster produces gaps along the edges in QGIS

I've got almost 1500 .adf raster files of LiDAR data that I need to merge/mosaic into one raster. The most efficient way that I found was to create a virtual raster of all of the files: gdalbuildvrt -...
3
votes
0answers
66 views

Download OSM data with QuickOSM and QGIS Modeler

I've been using QuickOSM plugin for some time and I would like to create some model that allows me to automate OSM data dowload in order to make sure that I am always working with the most updated ...
3
votes
0answers
28 views

Zonal Statistics calculator differences between QGIS Lyon and Wien

I am trying to implement a process that uses the Zonal Statistics menu function. In Lyon, the menu that pops up had a field with a list of calculations, each with a check box. Here you can select what ...
3
votes
0answers
34 views

Rotate feature by angle (QGIS)

Trying to offset a line by 10 degrees, rotating around an endpoint. I've read up on the older plugins and the new Rotate Feature tool, but am having trouble. I am using QGIS 2.8.9 Wien, reinstalled ...
3
votes
0answers
104 views

Error on running Saga GIS inside QGIS

I have installed QGIS (2.14.3-Essen) along with SAGA GIS (Version: 2.2.7) in Ubuntu (14.04 trusty). I am trying to fill the sinks in a DEM in QGIS processing using SAGA provider. I have used both the ...
3
votes
0answers
54 views

Multiple watershed delination with QGIS

I am trying to divide a DTM model in subbasins but I have set specific outlet points for the subbasins, and not to use a thershold. Is there a tool similar to r.water.outlet but with multiple outlet ...
3
votes
0answers
43 views

How to build a raster (population density) dependend diagram in QGIS?

I'm using QGIS and trying to solve the following problem. I got 2 layers: 1. population density raster 2. point layer with the information about number of people could be hosted/served etc in this ...
3
votes
0answers
92 views

Assigning different colors to different parts of text in labels using QGIS?

I'm using QGIS 2.14.3. It is now possible to assign different colors (or fonts) to different parts of text in one label (I have seen How to make a different font and color of text in labels? )? If so,...
3
votes
0answers
56 views

How to draw a longest and shortest straight lines through centroid in polygon?

I have a task I thought some of you might have idea how to solve it. I have shape and a centroid in it. I need to find longest and the shortest straigt line from the borders of the polygon. I use ...
3
votes
0answers
64 views

What is 'data source encoding' in QGIS?

I'm running QGIS 2.1.4 and Windows 7. For each layer, under properties there is a drop down box called 'data source encoding'. Mine is set to 'system'. I am wondering what this means, there seems to ...
3
votes
0answers
69 views

QGIS canvas refresh & rendering control from plugin?

Plugin Description I have been working on a plugin which essentially doing the same as "GPS information" live tracking but with capability of displaying two GPS streams. I am comparing streams and ...
3
votes
0answers
37 views

QGIS, deleting last placed vertice while digitizing, can I custom keyboard shortcut this task?

Upon searching this topic, I found the answer of using the delete or backspace key to delete the last placed vertex while editing. My question, Is it possible to reprogram this delete function to a ...