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

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1answer
14 views

QGIS Filter layer

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....
1
vote
1answer
8 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
84 views

ECW files not visible in qgis browser (or qbrowser as executed in console)?

version: 2.4.0-1ubuntu2 I'm following a web tutorial at lynda.com about QGIS. In one of the first videos I see there's this preview of raster files. There's the .dem files and the .ecw files among ...
1
vote
1answer
24 views

Add layers to Spatialite Database using PyQGIS

I would like to add layers into a spatialite database. I have used the QgsVectorFileWriter method: parcDisSHP='/xxx/xxx/xxx/xxx/FILE.shp' parcelasDis = QgsVectorLayer(parcDisSHP, 'Parcelas_Unicas', "...
3
votes
1answer
199 views

Loop to check multiple polygons overlap in r

I have a set of polygons (available here: http://ulozto.cz/x39ELbFt/polygons-zip) created in QGis and processed in R. I would like to know if they are overlapping or not, and if yes, where is the ...
5
votes
2answers
159 views

QGIS symbology: Change symbols outline color without loosing fill pattern

I have defined a layer symbology like shown in the screenshot below (categories are applicable laws however). The layer symbology is defined like this i.e. (no pattern fill): For these three ...
1
vote
1answer
27 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
563 views

How to select and zoom in features from a QGIS Python Plugin

I'm very new to Python. I'm trying to find a way to select and zoom to the features from a QGIS layer. I've created a plugin and built a custom form. I have 3 values from the form which I need to ...
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0answers
16 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
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0answers
9 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 ...
0
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0answers
30 views

Can Qgis read or access to WKT column on ms acesss?

On my ms access .mdb table, linestring (WKT) column are called from add vector layer selected database with odbc connection link. It is Successful but can't directly access lines from ms acess ...
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1answer
30 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 ...
2
votes
2answers
175 views

QGIS - Create equal length polygon along polyline

How can I create a series of polygons along a line? I need to assess the density of a number of targets along a line within a corridor. I have tried the following: creating a buffer, using the ...
2
votes
1answer
27 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, ...
0
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0answers
8 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 ...
1
vote
1answer
31 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 ...
3
votes
0answers
124 views

Snapshot command not producing high-res image

I'm trying to export an image of my project with a size of several hundred megapixels (32768x16384) via the snapshot command and all I get is an output file with 0 KB and no error message. I can ...
2
votes
1answer
248 views

gdal_calc works but I get a Python error at the end of each process

I have a problem while using gdal_calc by a .bat file. Here is the code : call "C:\OSGeo4w64\bin\o4w_env.bat" gdal_calc -A"D:\tuilage_script_1\tuilage\ndvi\4_810000_6370000_820000_6360000_ndvi....
2
votes
2answers
98 views

QGIS legend without print composer

I'm trying to export a series of images using the TimeManager plugin. I'd like to have a legend on each, to demonstrate why my datapoints are sized the way that they are (i.e. this circle size ...
1
vote
1answer
249 views

How do you extract the data behind a raster histogram

Bit of a newbie, so this may be a daft question. I have an .ecw picture - it is has no CRS, as it is a picture taken at ground level with an NIR camera. It was originally converted from a RAW image. ...
0
votes
1answer
186 views

QGis export part of map (box with coordinates) as raster

I would like to export a map of Switzerland (as part of googlemaps) to use as a background for a graph, but I need to know exactly where each corner of the map corresponds to (wrt spatial coordinates)....
2
votes
3answers
50 views

South-up projection/setting in QGIS

Is there a south-up setting for a projection in QGIS?
1
vote
3answers
602 views

PopUp with Images with QGIS2web

is it possible to create popups with images via QGIS2web? if yes, what would be the workflow? Couldn't it figure out yet. So any help is welcome! Thanks
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0answers
16 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 ...
3
votes
2answers
487 views

Different definition of EPSG:3857 in GeoTools and QGIS

I want to do some checking if my point lies in any of the polygons defined in shapefile. So, I thought that I will determine CRS from shapefile (created in QGIS), and use it for transformation (where ...
3
votes
2answers
98 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 ...
2
votes
1answer
33 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?
1
vote
1answer
198 views

SAGA Cluster Analysis for grids projection issue

I am having an issue with the SAGA cluster analysis for grids tool within QGIS 2.4. I am actually taking this as an online class through Del Mar and we are going over supervised and unsupervised ...
0
votes
1answer
45 views

How to use google maps engine connector?

I am trying to use google imagery in QGIS through the Google maps engine connector plugin. I relatively new to QGIS and need some help. What I want to do i use the google maps in QGIS and then print ...
1
vote
2answers
46 views

Why does deleting columns in the QGIS attribute table take longer than in 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
185 views

Couldn't load plugin PRISM due an error when calling its classFactory() method in QGIS1.8 inWin8

When I load a plugin in QGIS ,met some problems : I had tried copy other Python27's files to QGIS's Python 27 file but it still does't work. Couldn't load plugin PRISM due an error when calling ...
1
vote
1answer
29 views

Why does Print composer draw wrong coordinates?

QGIS Version: 2.14.3 EPSG: 32630 (WGS 84 UTM Zone 30N) I´m trying to draw a grid with EPSG: 32630. Layers are in the same CRS. As you see, coordinates are completely off. It does not matter if I use ...
1
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1answer
184 views

Merge layers (SAGA) ERROR

with QGIS 2.10 it is not possible to merge vector layers with the "Processing-Saga" tool (merge layers). The following error log comes up: Algorithmus Merge layers startet... shapes_tools "Merge ...
2
votes
1answer
38 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 ...
2
votes
1answer
214 views

How to update Trackball controls at three js

I have a project at three.js created from qgis to threejs export where i need to update the trackball controls on window resize.. I need to do that updating the whole controls calling the function ...
0
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0answers
29 views

Defining and exporting a path from discrete points in QGIS

I'm working with elevation data (NED, SRTM, etc.) in QGIS and I'm wondering how I might be able to pick a set of points from my map and export the coordinates to something like CSV? For example, I'd ...
2
votes
1answer
33 views

Getting polygons out of multi-polygon GeoJSON files?

I am a farmer and very new to GIS. I am trying to load shapefiles or KML files to an online site/service called FarmLogs.com. Once my "fields" are uploaded the site can tell me the amount of ...
2
votes
1answer
47 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 ...
2
votes
0answers
26 views

Annotating images on QGIS or using widgets?

I've georeferenced an old map on qgis and layered it on top of OSM, I want to do a class project and for it I would like to pinpoint certain areas on the map of which I have old photographs. I would ...
0
votes
0answers
10 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 '...
2
votes
1answer
29 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 ...
0
votes
1answer
217 views

How to suppress advanced digitizing tool window

I'm using QGis for years but suddenly I stuck with something that I'm sure it's an easy fix. Every time I start to create a new feature, the Advanced Digitizing tool window pops up. Do you know how to ...
2
votes
0answers
46 views

QGIS Atlas zoom to intersection between two different layers

I have two polygon layers, one is about different land owners boundaries and is used for atlas generation, and the other is about forests inside each property. In atlas generation sometimes i want to ...
1
vote
1answer
31 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
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0answers
11 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
0answers
15 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 ...
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0answers
14 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 ...
2
votes
3answers
237 views

Road Graph Plugin missing in Qgis 2.8.3

Road Graph Qgis plugin is missing in the official repository, at least, I am not be able to find it. Is it replaced for Network tool in Vector menu? Is there another easy way to have the shortest ...