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

learn more… | top users | synonyms (1)

5
votes
2answers
97 views

How to cartographically generalise buildings/settlements in QGIS?

I have a set of buildings in a polygon layer which I'm going to use in a 50k map. Since the buildings are tiny I cannot show the actual form of the building, instead I'm taking the centroid of the ...
1
vote
3answers
132 views

Geoprocessing Tools - I can't get Intersect/clip to work

I desperately need to intersect two layers, one of 32 large polygons (towns) the other of many smaller areas with those towns, so that I can classify and make calculations on the smaller areas sorted ...
0
votes
0answers
11 views

How to access components on UIFileLayout?

I have followed How to programmatically associate a layer with a custom UI? and added successfully my custom *.ui file to the editing window in QGIS. Now I would like to add an action to my custom ...
1
vote
0answers
26 views

Python QGIS - How to add the classic edit Menu in the Menu Bar

I am doing a QGIS application. Here is the plan: I start QGIS with no menus, toolbars, panels, etc. With nothing ! For that I have modify the QGISCUSTOMIZATION.ini With a plugin who start with QGIS ...
1
vote
2answers
48 views

I can't find geotag and import photos plugin (QGIS plugin)

I am doing a project on mapping tourist attractions and would like to attach photos and videos to point locations. I have read about the Geotag and Import Photos plugin but I can't find it in my ...
2
votes
1answer
25 views

Qgis 2.8 filtering the ten most populated places for a specified altitude

I try to filter data combining settlement and altitudes. I try to filter the 10 most populated places for a specified altitude. I tried this expression without success: "altitude">1000 AND ORDER ...
1
vote
1answer
20 views

capture mouse movement on QgsMapCanvas

I have a python app that uses QgsMapCanvas as map display. I put it inside a QWidget, which is then inside another control. The problem is that there seems to be no way of tracking mouse move event on ...
2
votes
1answer
158 views

Trojan in QGIS 2.12.3?

I have installed the latest QGIS, version 2.12.3. However, when I open it, Symantec says that it has discovered the trojan SONAR.TCP!gen4. See ...
1
vote
2answers
50 views

check the “quality” for (poly-)lines (density of vertices)

I want to check the quality of digitized tracks. I suppose, that a track with a lot of regular vertices has got a good quality. And a track with less regular vertices has got a poor quality. Maybe, ...
1
vote
0answers
24 views

Geocoding and SRID - can't get desired SRID

I want to geocode a set of addresses with GoogleMaps, store the results in a different SRID in a PostGIS table and then project it in QGIS over a layer with the identical SRID. So far, it has been a ...
4
votes
2answers
73 views

How to display vertex markers in QGIS for non-editable layers?

I've a PostGIS layer with read-only privileges. Is there any way to display the vertex markers of the layer?
1
vote
1answer
29 views

Navigating to Lat/Long in QGIS with a relative coordinate system

It seems really fundamental, but how do I pan the map center to a decimal lat/long in QGIS? I would type in the lat/long at the bottom, but I use WGS 84/Pseudo Mercator to use the streetmap from ...
1
vote
1answer
55 views

How to set conditional imports for a PyQGis script running inner or outer of QGIS?

Related to Cannot run standalone QGIS script I try to detect if my script is run from a QGIS instance (through the plugin) or from a standard python console. This detection will enable conditional ...
3
votes
1answer
38 views

Raster Layer Statistics CSV Output using QGIS Graphic Modeller

I am currently working on a project where I am using historical cloud coverage from MODIS Cloud Fraction data to try and estimate future cloud coverage of any particular month. I currently have ...
1
vote
0answers
12 views

Missing dependency for Lastools in QGIS 2.8.5 Wein

I am using QGIS 2.8.5 Wein and i am trying to install LASTOOLS toolbox....i followed the link to install it http://rapidlasso.com/2013/09/29/how-to-install-lastools-toolbox-in-qgis/ I did everything ...
3
votes
1answer
82 views

Convert KML to GeoJSON with ogr2ogr and remove KML special attributes

I'm trying to convert KML to GeoJSON (or some other formats) using ogr2ogr (look at this question). It's all working fine, except of one problem: I'm always receiving these metadata attributes with ...
-1
votes
1answer
54 views

Receiving GDAL Clipper Error from QGIS? [duplicate]

I realise there has been quite a lot of discussion on this topic and have already read through the suggestions on this forum of how to rectify this problem, but still nothing has worked. I am ...
2
votes
1answer
39 views

Working Windows Standalone .EXE From QGIS Python Script Using PyInstaller?

Has anyone been able to create a working standalone Windows .EXE file from a QGIS Python Script Using PyInstaller?
1
vote
1answer
34 views

QGIS2web page does not display curved labels

I have designed a non-real map, using QGIS. Until now, my map was very basic (a few layers with some polygons, dots, and lines). This map is a "decal" from a raster image. I recently add some custom ...
1
vote
0answers
27 views

Measuring in Print composer and main layer window in QGIS 2.12.3 does not match

I work on the municipality level and I am composing print maps with scalebar. I noticed, that length (or scale of my maps) is presented different when items are measured in my main QGIS 2.12.3 layer ...
1
vote
0answers
36 views

QGIS on Surface pro 4

I’ve just installed QGIS on my Surface pro 4 and I have a second big screen. So when I put the QGIS on the big screen the user interface is blurred. Can you help me?
2
votes
1answer
40 views

Is it possible to show data when hovering over an item with qgis2web (OL3)?

I'm using the qgis2web plugin and I want to show the records behind the different items on the map when I am hovering over them. Is that possible when you have layers devided into groups? And my ...
1
vote
3answers
56 views

QGIS export feature coordinates

I have a big project (whole country) and it contains smaller features (administrative units). My project is in .shp. How to export features' coordinates one by one or all at once as long as all ...
1
vote
1answer
43 views

Reprojection issue from WGS84 to UTM32

In QGIS I want to transform a point shapefile from WGS84 to UTM32 (EPSG:4647). The result moves the point from somewhere in Norway to a position off the coast of Congo, Africa. Can anyone explain ...
3
votes
2answers
155 views

Find points that are unique between two tables

I have been trying to work out a query that returns the geometry of points that are unique (eg. not supliacte). Is there a simple way to perform it in just one query? geom is the only common ...
2
votes
1answer
50 views

QGIS modeler: Error when extracting by non existing attributes. How to avoid displaying of error?

I have a problem with the QGIS modeler: The idea is to extract attributes ("DN" between 40 and 44) out of one layer. I want to use the outcoming layer for further algorithms. I calculated with ...
1
vote
0answers
35 views

How can I calculate times with gps data using random points on the track? [closed]

I have GPS data from a car that is circulating all the time in a closed circuit. I need to put a few points along the route, about 3 or 4 and calculate the time it takes to get between points. These ...
1
vote
1answer
28 views

Why doesn't Ordnance Survey street view raster layer appear on qgis map?

I've downloaded the relevant 100 km square of OS Street View raster data and have added the relevant 5 km square to a QGIS 2.8.2 map of scale 1:1500. The layer can be seen in the layers menu but not ...
3
votes
0answers
23 views

Can't open my saved .qgs file in QGIS [duplicate]

When I try to open my .qgs file I get the following error: It says that the project can't be opened, and that something is wrong when trying to read the project file, this is my translation. Can I ...
5
votes
1answer
87 views

Sequentially distilling several raster data sets into final map based on first time pixel’s value was greater than zero?

I have 120 daily data sets that contain a value only when a threshold temperature is exceeded. If the threshold has been reached that pixel was assigned a value indicating the day it occurred (the ...
1
vote
1answer
26 views

Changing legend label when cycling through Atlas created with QGIS composer

I have project which gets updated regularly and can have multiple areas which need to be mapped individually to go into separate reports. I generate an atlas in the composer and I have created a ...
1
vote
1answer
24 views

How do you view data contained inside hidden directories with QGIS browser?

I am attempting to browse data in a hidden directory, but the QGIS Browser tree view doesn't show in hidden folders? I know, I know...it's hidden. But is there a command-line switch to override this ...
0
votes
0answers
3 views

Retaining Raster Point Data Using wms [duplicate]

I have a single band raster being served via geoserver wms. When I view the raster through geoservers built in openlayers viewer I get different point value results than if I ask geoserver for a ...
4
votes
1answer
64 views

QGIS Finding valves to turn off for water lines

I am wondering if there is a tool for QGIS that can do what I am about to describe. It might be in network analysis but I am not sure. I have used water gems but it does not do what I want it to do. ...
1
vote
2answers
81 views

Export/Convert .tif + tfw into GeoTiff with tagged Metadata (coordinates)

What is the correct command line for using warp_management in Python (ArcGIS 10.1), to convert several georeferenced .tif's (or folders) with XML world files to GeoTIFF's with permanently written ...
2
votes
1answer
35 views

How to avoid point stacks?

When geocoding a dataset of about 500 adresses I get a vector point layer. As far everything is fine. The problem is, that the dataset contains multiple entries with the same adress. The result is a ...
0
votes
1answer
39 views

pyqgis: Add GeoJSON as editable Layer

following GeoJSON should be added to QGIS as an editable Layer: ...
3
votes
1answer
30 views

QGIS - Field Calculator: scale_linear gives unexpected result

When I try to use scale_linear, its output isn't as I expected. My values are from 1 to 16, so I set domain_min = 1 and domain_max = 16. I want to interpolate to interval from 1 to 4 so I set ...
1
vote
1answer
49 views

Map composer issue

I am using QGis (latest version, OS X) and whan I create a map on map composer everything works fine. I export the map to pdf file and also goes fine. But when I save and close it and then close the ...
1
vote
0answers
28 views

QGIS - Alternatives to Offline Editing Plugin

I am looking for a way to edit my postgis layers offline (in field) using a Microsft Surface Tablet. I have been testing the "Offline Editing Plugin" unsuccessfully. These are the issues I have ...
1
vote
1answer
41 views

QGIS Installed Components

We have QGIS installed and our users have roaming profiles. Some of the files which are installed under the .qgis folder in the C:\Users\username directory can grow quite large. These large files ...
1
vote
0answers
29 views

QGIS GeoSearch Plugin Issue

We are trying to use the QGIS GeoSearch plugin and intermittently receive issues with it. We know what the cause is and we wondered whether anyone else experienced this issue and had a solution? We ...
1
vote
1answer
28 views

How to create a grid point layer from a txt file in QGIS?

I have a ascii file (.txt) with the following columns ID, long, lati, value where long, lati are the coordinates (long/lat) of the cell centres of a LAT/LON grid with resolution of 30 arc seconds. ...
1
vote
1answer
33 views

Repositioning DXF Imported into QGIS?

I have a polyline drawing from AutoCAD that I would like to reposition manually, if possible. During my efforts so far it has been turned into both a tab file and shape file. The main source of ...
2
votes
2answers
52 views

Clipping a shapefile in QGIS that has user defined projections

I have two shapefiles for Rwanda which have user defined projections. I am trying to clip the geology shapefile so that it has the same spatial extent as the districts shapefile. When I clip, I do get ...
1
vote
1answer
32 views

How to make one checkbox that shows multiple layers in qgis or qgis2web?

I need to create one checkbox in qgis (and qgis2web) that than will show 2 other layers. So basically i don't want to check two checkboxes in the layerlist, but i want to simplify this proces by just ...
3
votes
0answers
42 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 ...
2
votes
1answer
73 views

Colour coding vector layers?

Based on a previous post, I tried to implement this in the expressions tab: CASE WHEN "dBM" <= 0 THEN '255,0,0' WHEN "dBM" > 0 AND "dBM" <= 20 THEN '255,255,0' ELSE '0,255,0' ...
1
vote
0answers
10 views

QGIS DB Manager hanging on import

I have a data set which is an extract from OSM. I'm only using the roads shapefile and adding labels. The extract is the state of Pennsylvania. I then tried to import this layer to PostGIS from the DB ...
5
votes
2answers
80 views

How to differentiate between bare soil and urban areas in Landsat 4-5 land cover classification?

I am trying to classify a Landsat 4-5 image using the semi automatic classification plugin (QGIS). I always get misclassifications between bare soil and urban areas as they have similar spectral ...