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

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3
votes
0answers
50 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 ...
1
vote
0answers
18 views

QGIS 2.14.2 Rotating map quick map service

I am currently using an Esri basemap. Standard built in functionality of QGIS 2.14.2 allows for the rotation of vectors, rasters etc. When I use rotate, all the vectors I added personally rotate just ...
1
vote
0answers
18 views

How to customize DB Manager default parameters

I'm using QGIS 2.10 and DB Manager plugin. I regularly use this plugin to display tables from a PostgreSQL - PostGIS database. I particularly use the integrated SQL Window to filter a table's content ...
7
votes
3answers
324 views

Distance between centroid and farthest point of polygon

I have a village polygon layer which has more than 6,00,000 records. I have calculated centroid of each village. I want to find the distance between centroid and the farthest node of each polygon. ...
1
vote
1answer
31 views

Georeferenced images gives wrong scale

When I georeference satellite images with a CRS for my region (Hartebeeshoek94), I get a scale of 1:10 and larger. But when I use WGS84 the scale appears correct, e.g. 1:50 000. I am using QGIS v2.13....
2
votes
1answer
20 views

SAGA Raster Calculator in QGIS Graphical Modeller not subtracting [on hold]

I am using QGIS 2.8.1 to build a model. All is working fine until the raster calculator input. I understand that the raster calculator in QGIS Modeller is a SAGA tool. With this, I have tried both the ...
-3
votes
0answers
30 views

Incremental (dynamic) Delaunay Triangulation

Is there an incremental (dynamic) Delaunay triangulation in QGIS or using a plugin ? While the “batch” construction of the Delaunay triangulation of a set of data points, for example, is well known, ...
1
vote
0answers
22 views

batch convert geojson to shapefile [duplicate]

I have a directory full of geojson files that I need to convert to shapefiles for editing in QGIS. As far as I have searched, there are no resources in GIS StackExchange that explain how to do this ...
2
votes
2answers
30 views

Create time series graph with multiple rasters

I need to create a time series graph for a few random cells with known underlying attribute such as "forest" or "agriculture" based on the VCI (Vegetation Condition Index). I have been reading and ...
5
votes
1answer
133 views

How to close/remove QGIS welcome page (recent projects) with Python?

Is it possible to close the QGIS welcome page with Python? I have a permanently docked Python plugin, that uses showRubberBand to directly write into map canvas. Therefor I have to close/remove the ...
3
votes
2answers
95 views

Opening ECW files in QGIS?

QGIS 2.14.1 opened .ECW files simply via the open raster menu, without any problems. In 2.14.3, the entire ERDAS Compressed Wavelets option has disappeared from the file type drop down, and QGIS ...
2
votes
1answer
60 views

QGIS Filter layer by expression [on hold]

Can I make the filter by the value that is obtained by the function? for feature in iter: name_dot = feature['name'] print name_dot expr = QgsExpression("\"name\"=name_dot") selection= layer....
4
votes
1answer
130 views

Performing simple line-of-sight analysis in QGIS?

I've just installed QGIS on macOS in an effort to determine if two points in my neighborhood have line-of-site. I've got a 7.5 arcsecond DEM loaded, and a point layer with my two points (no elevation ...
1
vote
1answer
32 views

QGIS Offline Editing Tool

I tried to test the QGIS Offline Editing Plugin but it appears not to work at all. I'm using qgis 2.14.3 running on a Lenovo Yoga 900 and Windows 10 on the client side. For the server I'm running ...
1
vote
1answer
32 views

Array written by GDAL with Python script has numbers read as “nan” by QGIS?

I would like to write an array to a geotiff with Python script using the GDAL module. When I try to do something simple like copying an existing GeoTiff via reading it to an array, then, writing to a ...
0
votes
1answer
40 views

Mapping Australian election results using QGIS? [on hold]

I am interested in mapping Australian election results. There is a good tutorial here using British elections as an example. However, it relies on him joining two datasets using vlookup. I can't work ...
1
vote
0answers
11 views

QGIS import variable existing .qgs file

I need to include in the file containing geographical coordinates of my region a new external variable that I would like to use to grade the colour of the different parts of the whole map. I know how ...
0
votes
0answers
47 views

how to create geometry type(point,line,polygon)on esri personal geodatabase*.mdb?

Qgis can not read geometry type on ms access*.mdb's table connecting with esri personal geodatabase *.mdb? This can open as test file, but unknow geometry type. Point can create using with "point ...
0
votes
0answers
18 views

QGIS MSSQL on OSX

Could someone please help me or point me to the right resource with my Question. I have an OSX machine, with QGis 2.12.1, and a windows instance with MSSQL running on AWS. For the life of me I cannot ...
1
vote
1answer
38 views

QGIS “Raster->Georeference” menu item not showing up

I am using QGIS 2.12.0 Lyon. I have installed a plug-in called "Georeferencer GDAL" and the version of that plug-in is 3.1.9 . [I am working on a Mac which is running OS X Yosemite 10.10.5.] I am ...
6
votes
1answer
58 views

What are the units of the QGIS roughness tool results?

When I estimate Roughness, using QGIS [Raster > Analysis > DEM (Terrain models)], what is the unit of the values I get?
3
votes
3answers
125 views

Is there an automatic way to create a diverging colour scale centered around zero?

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 ...
1
vote
0answers
12 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 '...
4
votes
1answer
64 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 ...
4
votes
2answers
44 views

How to set up future-proof line labels for data that is regularly 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, ...
3
votes
1answer
32 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
votes
0answers
20 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
vote
0answers
12 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
53 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) ...
1
vote
1answer
21 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 ...
1
vote
0answers
40 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 ...
1
vote
0answers
25 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
vote
1answer
38 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 ...
1
vote
1answer
33 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,...
0
votes
1answer
23 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
votes
0answers
22 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
votes
1answer
66 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 ...
3
votes
0answers
24 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
1answer
19 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
votes
2answers
49 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 ...
2
votes
1answer
88 views
+50

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 Q3ButtonGroup). However, ...
3
votes
1answer
54 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 ...
1
vote
0answers
32 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 ...
1
vote
2answers
155 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
votes
0answers
36 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?
0
votes
0answers
16 views

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

Can anybody explain whats this number(highlighted location) represents in watershed basin?
3
votes
1answer
57 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 ...
1
vote
0answers
17 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
vote
0answers
37 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 ...
0
votes
0answers
32 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 ...