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

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How can I connect MYSQL database in python for QGIS desktop Application?

I am following below process. 1 - Setting You must install a MySQL driver before doing anything. Unlike PHP, only the SQLite driver is installed by default with Python. The most used package to do ...
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0answers
9 views

How to place labels at the boundary of the current map extent

I have a layer of reference grid lines on top of several map layers. The grid lines should be labeled with coordinate values: vertical grid lines with x-values and horizontal lines with y-values. The ...
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6 views

Fail in searches on the joined table data

When a table is joined to a attribute table, the searches on the joined table data return a fail. Is there another way to solve this inconvenient without save the layer with joined table under a new ...
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2answers
31 views

Opening HDF data in QGIS on Ubuntu?

I try to open modis aqua data (HDF5 format: A2015208112000.L2_LAC_OC.nc) on QGIS 2.8 ver. And an error appears: No extra dimensions found. Could someone help me to solve this problem?
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0answers
17 views

Join tables in QGis 2.01. Dufour

I performed a "join" going to the properties option in a shapefile (in this case is just a table), in order to join the attributes from another shapefile that has a field in common, specifically ...
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8 views

dynamic styles for rasters in qgis processing

I am writing a qgis processing script that loops a table column and does interpolation and would like to know if it is it possible to generate styles on the fly for raster layers and how to do it. I ...
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1answer
12 views

Information about the setDataDefinedProperty

In the QGis C++ API v1.6 there is a function called setlowerValue to set a value for a specific Symbol In my application i use QGis C++ API 2.8.2, i try to understand how the function ...
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0answers
16 views

Using Multiprocessing inside a plugin in Qgis

I spent quite a bit of time looking on how to use the multiprocessing package, but couldn't find anything on how to use it inside a plugin in QGIS. I am developing a plugin that does some ...
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1answer
10 views

Relation Reference to simulate filtered drop-down lists

I have a layer of Land Uses that has a 3-tiered classification system (basically so that it can be broken down for different uses by other people). I have managed to create Project Relations and use ...
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1answer
17 views

How to automatically load QGIS actions

There is something that I like alot in QGIS, and that is actions. From automatic wikipedia search, to opening an image, this use makes QGIS feel very dynamic. Unfortunately I have no idea how to ...
2
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1answer
14 views

Share a qGIS sales territory database across a cloud based office

The business I work for has a network of dealers across America. Dealers are assigned ZIP codes. When we have a potential dealer, we would like to create a new territory for them and integrate it into ...
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0answers
15 views

Is it possible to animate a cartogram with FOSS GIS?

I was wondering if anyone knows of any FOSS tools to animate cartograms? By this, I mean 'tweening' between the geographic shapefile and the cartogram version of a shapefile. This means gradually ...
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1answer
31 views

How to make a square poly shapefile [duplicate]

I need a square polygon to clip layers to, in QGIS, a perfect square perhaps. It needs to be a certain size. Anyone have any experience or any good ideas? Thanks
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29 views

Finding out points overlapping with another polygon shape file

I have two shape files.. 1) HQ500(polygon flood shapefile which represents the level of flood in gridcode) and 2) transformer_Station(point representing location of transformer stations). ...
3
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1answer
37 views

Projection issues whilst opening shapefile in ArcMap created in QGIS

I created a polygon shapefile in QGIS. Projection was saved as EPSG: 3857, WGS 84 / Pseudo Mercator. When I open this shapefile in ArcMap the projection sets itself as WGS_84_World_Mercator which I ...
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2answers
29 views

Mean coordinate issue with multipart polygons

I've been using Mean Coordinates in QGIS to find weighted mean centers based on different attributes for the counties in a singular state of the US. However I have come across a problem in which the ...
2
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1answer
18 views

How do I create a bivariate map legend (3x3 cells) in QGIS?

I would like to create a bivariate map, and need to create a 2 dimensional legend to accompany it. How do I create a bivariate map legend (3x3 cells) in QGIS?
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2answers
32 views

How to join the attributes table from one input layer to another layer with unique id using python

I have one input layer with the attibute values and i wanted to join the attribute table of the input layer to the another layer with unique values using python. ...
2
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1answer
30 views

ST_Union based on attribute

I have a road network of center lines of MultiLinestrings.They have nodes at every intersection. I try to understand how I can merge roads together that have the same category as attribute (There are ...
3
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1answer
39 views

explode features based on numerical field

I have a set of data as polygons, each with a Number field with value X. Is there then a way to copy this into X number of polys at the same location? (ideally points distributed across the poly but ...
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1answer
37 views

Remove lines from inside a polygon in QGIS

Through a "dissolve" process in QGIS, I achieved some polygons that have some fails, like this one in the screeshot: Is there any automatic process I can make in QGIS to remove those lines inside ...
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1answer
82 views

Is there a Highest Position tool in QGIS

I am familiar with the tool Highest Position (Spatial Analyst) in Arcgis, but I am trying to replicate this tools function is QGIS. Is anyone aware if this tool exist in QGIS (possibly under a ...
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0answers
18 views

Vector layers don't seem to be exhibited properly [duplicate]

I'm a veterinarian that uses qGIS for making basic outbreaks maps, and am trying to branch out and expand what I'm doing. When I first started using qGIS 3 years (I believe it was 1.7), ago, when I ...
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34 views

how to use spatial index in spatialite query

I posted this question originally nearest neighbor query in SpatiaLite. Thanks to the answer given I was able to get the query working on some test data. However I am having trouble applying a spatial ...
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0answers
16 views

QGIS version migration of Styled Layer Files

I have a stand alone application which reads SLD files, to draw something on a map canvas (development started under QGIS version 2.0.1). Unfortunally I have to deal with these old SLD files version ...
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0answers
28 views

One-to-many join in QGIS

I am looking for a possibility to make a one-to-many table-join in QGIS. I have a shapefile with postal codes and would like to join them with survey results (more than one). In other words, there ...
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0answers
21 views

Can I use GeoJSON GeometryCollection in QGIS?

I want to create a GeoJSON that contains multiple geometries to be used in QGis later on. Now I red through the specs here: http://geojson.org/geojson-spec.html#geometrycollection When I simply copy ...
2
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29 views

How to run qgis scripts in parallel across remote server(s)

I have a stand alone python script using qgis that I wrote with the help of the SE question here The script takes three arguments being; an input file path, an output file path, and another input ...
2
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0answers
27 views

Adding elevation data to existing vector layer using QGIS?

I'm new to qgis and I'm having trouble adding elevation data to my existing vector file. I currently have two files: a road network with the all attribute information and a vector file with point ...
1
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1answer
42 views

Installing two versions of QGIS in Ubuntu?

I would like to have two versions of QGIS (2.8.2 and 2.8.10) in Ubuntu 14.04. I have tried to do it by using the SIG sem grilhetas tutorial. However, it didn't install qgis 2.8.2 in my ubuntu ...
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31 views

ZeroDivisionError

I was conducting Mean Coodinates process functions with weighted fields when I began faces ZeroDivision errors in some processes. The Shapefile Data has been joined together with imported Spreadsheet ...
3
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0answers
28 views

Path edges for interpolation output

I've built the following heatmap using QGis 2.8.2's Raster->Interpolation feature. It looks almost the way I want: The background layer is Google Maps tiles by using the OpenLayers plugin. ...
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24 views

raster layer color legend with range of values

Is there a way to make clearer legends in qgis? At the very least indicating the range of values and whether the color includes the upper/lower limit of the range. if I make a discrete color ramp for ...
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0answers
47 views

How to create contours from an IDW raster

I'm new to QGIS and am trying to create vector contours from this IDW raster. I followed Ujaval Gandhi's "Interpolating Point Data" tutorial step by step but am not getting the same results for step ...
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1answer
35 views

Is there a way to integrate my own custom tools into the Processing toolbox in QGIS?

Is there a way to integrate my own custom tools into the Processing toolbox in QGIS? I believe I have found where to strategically hack the stock processing scripts to ensure it picks up my custom ...
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3answers
27 views

How can I get the UK Land Cover 2007 25m raster data set from Digimap to work in QGIS?

I have downloaded the UK Land Cover 2007 25m raster data set from Digimap (which my university has a subscription to). I have uploaded the data into ArcMap where it works fine, with all 23 classes and ...
1
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1answer
33 views

How to calculate azimuth in QGIS field calculator?

Is there any way to calculate the azimuth of two points in the QGIS field calculator? The coordinates are stored in an attribute table. x1 | y1 | x2 | y2
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1answer
44 views

How to install QGIS 2.8/2.10 on Ubuntu 14.1? [duplicate]

I have installed QGIS 2.0.1 on Ubuntu 14.1, yet I am not able to update to 2.8 or 2.10 since the proposed repository paths installations do not work. Anybody who can guide me through with a click ...
1
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1answer
45 views

QStringList() error in plugin of QGIS 2.10

I have made a Dialog in PyQt for use it like a plugin under QGIS 2.10 The Dialog works fine like a standalone application, but if I try to call it like a QGIS plugin, I get this error: ...
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0answers
10 views

Can't get QGIS plugin translations (i18n) to work!

It's hard to be specific, but I'm having problems setting up translation files for the plug-in I'm building. The plug-in works fine, but I also want to enable translation of the GUI. I've tried to ...
1
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1answer
19 views

Failed to create memory layers in QGIS application on Linux

I have written a python class which reads properties of map layers from an XML file and creates appropriate memory layers. I have developed and tested this code with QGIS 2.8.2 on a Windows 7 machine ...
2
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1answer
25 views

How to dynamically change images in map reports?

I need to make a report about several cadastral parcels which data are contained inside three different tables of a database. Report must contain: Cadastral data taken from the three tables A ...
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0answers
23 views

Toggle Editing Mode issue with QGIS 2.8 [on hold]

Returning to QGIS after a long absence. Probably missing something basic, but I can't click on the Toggle Editing Mode (pen symbol) when I open an Attribute Table in QGIS 2.8. Any pointers?
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1answer
9 views

QGIS: why does simplesvg export plugin generate poor quality output?

I am exporting a QGIS project to SVG via the simplesvg plugin. However the output is of really poor quality: all coordinates appear to have snapped to a rather coarse grid (while original data, as ...
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1answer
41 views

nearest neighbor query in SpatiaLite

I am trying to find the nearest line to each point in a layer, and I have over 1 million points. I want to be able to associated the closest unique line ID with the point unique IDs. I have tried to ...
1
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0answers
18 views

How to write a test suite for QGIS standalone application

I have a rather simple QGIS standalone Python app (2.8.2, Windows 7/64), with some published methods to create different types of geometric primitives (rectangles, circles). class MyApp(QMainWindow, ...
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0answers
24 views

How to render the Sea depth level in different color?

I would Like to adapt an old code in c++ using the api qgis 1.6 : const QgsRenderer* lrenderer = pLayer->renderer(); if( lrenderer == NULL ) lrenderer = new QgsSingleSymbolRenderer( ...
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2answers
30 views

Where is the QGIS API action for “deselect”?

Where is the QGIS action for the “deselect” toolbutton in the 'Attributes" toolbar? I do not see this action in the QgisInterface class or do not recognize it by name. Is it missing from iface? I'd ...
2
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3answers
87 views

How to project a layer from WGS84 lat/long (automatic projection) to WGS 84 UTM Zone 23S in QGIS?

So I have a vector layer of polygons in WGS 84 lat/long (i.e. using the automatic projection for lat/long and WGS84 datum). I want to change that to WGS84 UTM 23S in QGIS. I tried doing like online ...
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0answers
24 views

Problem with making raster from Aspect and wind direction data [duplicate]

I know its not correct to ask for work flow, but I am learning by doing and now I don't know how to move on. I'm trying to make new raster which will represent the facing sides of hill around a ...