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

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23 views

Diverging Colour Scale in QGIS

I'm trying to plot a map of the residuals of a linear model. My residuals centre around zero and can obviously go in either direction. Is there an easy way to apply a graduated colour scale to these ...
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0answers
9 views

Provider feature filter causes QGIS rendering to stop

I'm running QGIS 2.14.0 Essen on OSX 10.11.5. I would like to create a simple thematic map showing a subset of points over a basemap with state and county boundaries. I used an IN query in the '...
1
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1answer
30 views

Labeling every feature using QGIS?

I'm working on a wall map that needs to include labels for EVERY street and address range. I recognize that I will have to do a lot of editing to make it work, but I can't even get QGIS to put the ...
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0answers
12 views

future-proof labels when data is updated

I have a layer that I have processed heavily in FME before using it in QGIS. In the future I will have to reprocess it periodically when the source data is updated. It's a municipal street layer, ...
2
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1answer
15 views

Locking panels in QGIS

I am new to QGIS. I have set up several desktops with QGIS to be used by mostly GIS novices in our agency. One of the problems I have encountered is that they accidentally close off one or another of ...
2
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0answers
10 views

Finding vectors with wrong direction in river network

I have a shapefile containing network of rivers for the whole country. The description of the layer is saying that orientation of the vector should be the same as the river flow. This is true for most ...
1
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0answers
10 views

Getting the activeLayer() in Eclipse

I've been working on a plugin in python for qgis. I'm using Eclipse-pydev with remote-debug. I believe I'm set up correctly; I've followedthe Cookbook instructions completely. When starting remote-...
2
votes
1answer
24 views

Python to create new fields in many layers / QGIS

I have a number of line layers on which I need to perform the same task: add 4 columns with the start and end points of each line. The expressions that I use to do this are: $xat(0) $xat(-1) $yat(0) ...
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0answers
13 views

Loading and using 600k+ entities (from Oracle DB) in QGIS?

I'm new to QGis and working on some land register's datas. I tried to load an Oracle spatial layer, but with more than 600k rows, it took a very long time to process, when it didn't crash. After the ...
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0answers
22 views

QGis 2.14 Essen windows 7 not working

I Installed QGis 2.14 Essen, but when I run it I can see the splashscreen for few seconds, then it disappears and QGis is not running at all. Before to install the new version (2.14) I had QGis Lyon ...
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0answers
12 views

How to implement a Plotting widget into already existing PyQt4 Interface

I am using Python, PyQgis for about one week and already built a plugin for GIS 2.14 which is -so far- working pretty well. As my next step I want to add a widget to plot data to my already existing ...
1
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1answer
20 views

How to connect QtDesigner with python console on QGIS

I've created a script with python console on QGIS and an interface for my plugin with Qt Designer with QGIS 2.14.0 custom widgets. I would like to connect my sript with the interface but I can't find ...
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0answers
21 views

QGIS: startup.py executed twice?

To test something I have a very simple startup.py file in my .qgis/python folder: import qgis qgis.utils.iface.actionShowPythonDialog().trigger() print "Welcome chump" Python console launches fine,...
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1answer
20 views

Invoking QGIS style dialog from Python standalone script

I can load a layer, open a canvas, and draw the layer in the canvas using the Qgis python API. Can I bring up the properties dialog, or even just the "Style" tab of the properties dialog, from such a ...
-3
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0answers
21 views

Error de JavaSQgis en Qgis [duplicate]

Cuando intento cargar la imagen de Google en Qgis 2.2 Valmeria me sale este error "Esta página no pudo mostrar un elemento de Google Maps. Contacta al administrador del sitio. Si eres el ...
2
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1answer
21 views

Trouble using “Clip Raster by Mask Layer” algorithm QGIS

I'm having issues using the "Clip Raster by Mask Layer" algorithm to clip a raster by a shapefile. When I run the algorithm, I get an error saying that the mask layer could not be loaded, even though ...
2
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0answers
14 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 ...
2
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1answer
15 views

ASCII Raster Statistics?

I have downloaded the following precipitation data in .nc4 format(attached). I have opened the 'PRECIPITATION' variable in the file in QGIS and I have made a note of its statistics. As working with nc ...
-1
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2answers
33 views

Applying SLD file exported from QGIS in GeoServer - why is color not applied?

I was trying to put style of color classification that was created in QGIS. It works in Geoserver but the colors are not shown. It is always single color. I have read that this is often a problem with ...
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0answers
22 views

How to use Qt3 Support widgets in QGIS plugin?

Similar to this post: My plugins crashes with “No module named qgsprojectionselectionwidget” in Windows. Except I would like to also use Qt3 Support widgets (in particular, a Q3GroupBox). However, ...
2
votes
1answer
38 views

Google Maps / StreetView coverage layer in QGIS

I've come across a useful method for adding Google layers as a raster in QGIS: High resolution, printable alternative to OpenLayers plugin for QGIS? Does anyone know what the serverUrl is for the ...
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0answers
28 views

Overlapping despite topological editing

I am digitizing polygons from an ortophoto. In the snapping options, I enabled 'topological editing' and 'avoid intersection' of the polygon layer. I digitized some not-adjacent areas and then made a ...
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2answers
146 views

get lat/lon values of every start and end point of polyline

I have a polyline shapefile with 166 different line features. How would one populate the attribute table with x and y values of the start and end points of each line?
2
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0answers
31 views

Filling gaps automatically in QGIS?

Can I close the gap between these two polygons automatically, without using editing tools? Is there a plug in to do this?
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0answers
15 views

Explaining what number (highlighted location) represents in watershed basin?

Can anybody explain whats this number(highlighted location) represents in watershed basin?
2
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1answer
50 views

QGIS Symbol Categorisation

layer = iface.activeLayer() # get unique values for 'severity' field fni = layer.fieldNameIndex('severity') unique_vals = layer.dataProvider().uniqueValues(fni) # define categories to use in ...
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0answers
13 views

building qgis on windows, cmake error

I am trying to build the newest qgis project on windows 7 in my 32 bit machine. I followed the official instructions and during the cmake configure I get the following error. CMake Error at C:/...
1
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0answers
29 views

How do I get imported KML circles to appear as circles rather than ellipses in QGIS?

I have a QGIS project, CRS is WGS84 (EPSG 4326). I have OpenStreetMap as the base layer. I have loaded some point features. I have created a buffer zone around some of these features with WGS84 as ...
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0answers
31 views

QGIS Custom Query Plugin

I am very new to QGIS plugin development. Is it possible to create a custom form (Field will be fixed and User can select only operator and enter value for field) to do custom attribute expression ...
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0answers
20 views

Qgis open street layer google street layer not open [duplicate]

When the google map street layer plugin starts I see the error in the image below. How can I make this plugin work?
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0answers
9 views

QGIS Openlayers PI stopped loading Google Satellite today? [duplicate]

The QGIS Openlayers plugin returns the message: "This page was unable to display a Google Maps element. Please contact the site administrator. If you are the administrator of this site, please ...
0
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0answers
18 views

QGIS Server : Premature end of script headers: qgis_mapserv.fcgi.exe

I've installed QGis Server on my computer (Windows 8/64Bits). I didn't get any error while installing it. But when i try to get an XML response from my server using : 127.0.0.1/qgis/qgis_mapserv....
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27 views

QGIS persistent connection to MS Access tables/queries

I am new to QGIS and currently on a steep learning curve. I need to access tables/queries in an MS Access database and have managed to do so via the eVis plugin. The problem I have is the fact that ...
0
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0answers
12 views

Using QGIS like ArcPad to average coordinates from GPS reading for point feature?

I have been able to sync my SXBlue GPS receiver to my tablet with QGIS via the GPS Information Window / bluetooth. I can view our coordinates, PDOP, etc and want to create a point shapefile that ...
1
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1answer
27 views

Fixing python error in QGIS Freehand raster georeferencer plugin?

I am using QGIS 2.8.9 stable release in the 32bit form on a Windows 7 64 bit compatible PC. I want to use the Freehand raster georeferencer plugin. It installs without difficulty but when I try to ...
2
votes
1answer
34 views

Why the table fields imported from a .csv file have a length of zero?

I've imported a .csv file (with relative .csvt) in QGIS 2.8.4 adding a delimited text layer... the table was correctly been imported but the table fields have a length of zero... the fields types ...
1
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0answers
8 views

How to import USGS SDTS ddf file into Qgis

I have downloaded SDTS dem files from the USGS. These extract from tar.gz files as ddf files. I have tried importing these files into Qgis using "add raster layer and choosing .ddf or .DDF from the ...
1
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2answers
35 views

Import Shape File Then Export Coordinates

I have received some shape files which I believe are from ArcGIS. Each "file" consists of a number of physical files, e.g. kv_27.dbf kv_27.shp kv_27.shp.xml kv_27.shx I need to extract the ...
1
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1answer
33 views

How do I know which way line features are oriented?

I'm working on QGIS on a street shp file which has Left From, Left To, Right From, Right To fields fields, building a geocoder. I need to know which way these features are oriented, which I think is ...
1
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2answers
73 views

Exporting contour lines from CAD to GIS

I've been using GIS softwares in the past few years by I'm new using AutoCAD. Well, I have contour lines in AutoCAD and I want to export it into QGIS (I also have access to ArcMAP). I saved as .dxf ...
1
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2answers
37 views

QGis: Deleting columns in the attribute table - takes quite long campared to ArcGIS?

In QGis, I recognised that deleting columns takes quite a while - is there a faster way than doing it in the attribute table (in editing mode?). I am speaking about a table with ~ 300 000 lines... ...
1
vote
1answer
19 views

Help using offline QGIS API documentation

I have downloaded the QGIS documentation for offline usage, am I correct in thinking that the qgis.qch file is the one I need to open to view the documentation, using Qt Assistant? I have a Qt ...
1
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0answers
19 views

How to create basic GB region postcode area map [duplicate]

I want to make a simple map of SW England that shows polygons over the postcode areas (e.g. EX1, PL19, each in an shaded area with boundary line). If I search the postcode area on google maps (online) ...
1
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1answer
61 views

QGIS set default style for layers based on name

I know that it is possible to apply default fill/line/point and colour ramp styles for layers within a project, However... I have a model which spits out raster layers with defined names (e.g. ...
2
votes
3answers
49 views

Change display of a shapefile to draw the smaller polygons in front of the bigger ones

I have a polygon shapefile, with overlapping elements. Currently, QGIS displays the biggest one on top of the others, which hides the smaller ones behind. Is there a way to change this behaviour and ...
1
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1answer
39 views

QGIS - choosing layers for geoprocessing tools

Am I right that if I want to choose layers for geoprocessing tools I always have to choose the shapefiles via the path directory? I can't drag and drop them from the layerwindwow on the left like in ...
2
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0answers
16 views

Can not install Microsoft SQL Server 2012 Native Client on windows 10

I am trying to compile QGIS project myself. I am following the instructions below, which seems to be official guide but outdated. https://htmlpreview.github.io/?https://github.com/qgis/QGIS/blob/...
2
votes
3answers
90 views

Adding excel table to QGIS print composer?

Can anyone suggest some ideas to add a excel table to the print composer which will then be exported as a A3 png while retaining resolution. Attempted pasting in word as an enhanced meta file then ...
4
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1answer
105 views

Loading GeoJSON into QGIS

I am a beginner with QGIS. I am trying to learn it through lynda.com. I have tried downloading the nanaimo crime map in GeoJSON format, but I get a message saying that the data source is invalid. I ...