Questions tagged [qgis]

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

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682 views

QGIS select by location doesn't use selected features only

I'm using QGIS 2.14.3 - Essen (but have also tried 2.18.12 Las Palmas) Using 2.14.3, if I select one feature in a vector layer, and then use [Vector][Research][Select by Location], I have the option ...
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1answer
142 views

How can I add output vector to a list to loop a geoprocessing on it?

I have about 18000 circular buffers that I want to transform in some kind of a wind rose. To do this, I transform the buffer polygons to lines, create points along the lines on the wind directions ...
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2answers
214 views

How to Run Buffer on QGIS Points [duplicate]

New question branching off from Geometry Errors with Imported Shapefile, Unable to Fix I attempted to buffer datapoints to convert them into many small polygons (so it will be acceptable .shp polygon ...
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1answer
79 views

Knowing TYPE parameters accepted values for RQGIS?

I'm trying to use RQGIS interface with QGIS to create a polygon grid. One of the required parameters is TYPE. Where can i know the type of parameters to this algorithm? and to others? From data ...
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1answer
2k views

QGIS Numerical Vertex Edit - anyone else finding it doesn't work?

The QGIS Numerical Vertex Edit plug-in used to work fine, but stopped working for me around about QGIS 2.6. I now use QGIS 2.8.1 Windows 64 bit. The plug-in no longer seems able to see points or ...
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1answer
337 views

How to depict line symbols with length from attribute

I want to depict angled drill holes as a horizontal traces (plan view). I have a CSV file with X,Y,Azimuth and Horizontal length. Using the simple marker I can get a line pointing in the right ...
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2answers
4k views

QGIS: Connect to a REST service

I want to connect to this REST Service, from QGIS Essen, using its URI: http://maps.six.nsw.gov.au/arcgis/rest/services/public/NSW_Property/MapServer/2?f=pjson Any tips please? I tried adding it as ...
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1answer
214 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 ...
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516 views

Is there way to define processing extent in QGIS?

Is it possible to define the extent of a processing tool, like it is in the "Environments" in ArcGIS? For example "Same as Display, or "Same as Layer..".
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2answers
84 views

How to get number of Lane from OSM?

I am using OSM for my project, I have downloaded data from http://download.geofabrik.de/ in the OSM file and imported the data in POSTGIS, In the planet_osm_roads, I am not able to see any key related ...
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1answer
323 views

Export shapefile with “non standard” characters to csv and read in excel

Macbook air mid 2011 running OSX 10.10.5 QGIS 2.8.2 - Wien Excel 15.13.1 (O365) When I export a shapefile containing non-ascii characters to a csv file using QGIS (setting encoding to utf-8) and ...
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1answer
150 views

Use QGIS for dynamic ECDIS presentation

I would like to use qgis similarly as a chart plotter for dynamic data that are created by a Fortran code (being basically a ship simulator.) I have two questions: how do I integrate Fortran into qgis ...
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175 views

QGIS clipping raster with CUTLINE_ALL_TOUCHED

How should the CUTLINE_ALL_TOUCHED option in gdalwarp (referenced here) be used to correctly include all of the touching pixels of a vector boundary to a clipped image? As can be seen below, the ...
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224 views

QGIS symbology to ESRI

Does anybody know how to export the layer symbology from QGIS into a format that can be used by with ESRI products? I have been successful in exporting an XML but it quotes the file type as: !DOCTYPE ...
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1answer
7k views

Measuring Volumes using DEMs

I've done quite a bit of research here and elsewhere and am still having trouble coming up with a solution for measuring volumes using a DEM derived from high-resolution (1 m) stereo satellite imagery....
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1answer
5k views

How to merge multiple KML points into one file?

I made 20 KML points in Google Earth, and put it in gis - I want to save it in a single file, right now they are 20 different files. How can it be done? What I want to have is a single gpx file.
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1answer
454 views

Basic instructions for loading OS Terrain 50 data

Are there any basic instructions for using the OS Terrain data available online? I do not have an issue extracting - it is all sat in a folder ready to go. What I cannot work out how to do is to ...
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2answers
2k views

Raster Calculator Error : Insufficient memory available for operation

Performing Raster calculator with a raster of size about 750 mb and it is showing an error of insufficient memory . Ram : 8 GB I have a huge space available at the location where it has to be saved. ...
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1answer
128 views

How to see the 'example provider' in processing toolbox of QGIS?

I would like to create my own provider with the processing toolbox. I see the example provider in my folder C:\QgisWien\bin...\algs\ExampleProvider. It seems to be a good start but unfortunately, I ...
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1answer
772 views

Openlayers Overview and OpenLayers versions

I have installed OpenLayers and the Openlayers Overview plug-ins but I am not sure if they are working. I can create new 'open' layers from the Openlayers plug-in drop down, but when I try to add a ...
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1answer
263 views

How to generalize polygones in QGIS

I am working with vectorized greyscale images converted into polygon layers by the QGIS vetorize tool. Currently I am using a rather long way to get rid of small polygones. I convert the polygons ...
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1answer
152 views

Wrong dimensons on .png-file when using gdal_translate

I am using gdal_translate -of PNG -ot UInt16 -scale MIN MAX 0 65535 "source.tiff" "output.png" in the command-prompt to create a .png-file from a .tif-file that I created using the Interpolation-...
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1answer
472 views

Problem starting QGIS 2.14, Prozedureinsprungpunkt is not found

I have a servere problem concerning starting QGIS 2.14.3. I haved installed that version using OSGEO4W installer. Besides, I have QGIS 2.8.6 on my machine to keep the old LTR version. As it is ...
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0answers
539 views

QGIS Layer Order Panel - add layers at top of layer order [duplicate]

I have a QGIS workspace in which the order of the layers is controlled by the Layer Order Panel. When I add a layer it automatically ends up at the bottom of the order and has to be manually shifted ...
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1answer
7k views

OpenLayers Plugin not working in QGIS 2.8.1 [duplicate]

I am using QGIS 2.8.1. I have installed the OpenLayers Plug, however it is not showing up in my list of plugins. I confirmed it's installed in the plugin manager. Is anyone else having this issue?
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1answer
965 views

Problems opening ASC files in QGIS

I am trying to open an .asc file (pick, for example, that one for 2014) from the German Federal Ministry of Transport and Digital Infrastructure. It contains information on the annual solar radiation. ...
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2answers
1k views

Can't compile plugin builder plugin in QGIS 2.4 (Windows)

I'm trying to build a basic plugin using plugin builder but I can't even compile it. I tried following a few tutorials and just trying to compile whatever but that always results in the same problem. ...
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1answer
56 views

The Logic Marker Moving with the Offset Function in QGIS 3.6.2

In QGIS the location of the marker can be changed, without changing the coordinates in the Attribute Table. This is done by changing the X or Y values in the Offset function, located in the Layer ...
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0answers
71 views

Updating identify tool every time feature is selected with PyQGIS3

I want to use the "Identify Feature Tool" in code (PyQGIS3). What I've found in the internet doesn't use the tool, people usually print in console point features and ids. I also found a tool that ...
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1answer
1k views

Writing result of PyQGIS to shapefile

I try to perform some zonal statistics on a shape- and rasterfile and write the output to a completely new shapefile! import sys # where is the module sys.path.append("/Applications/QGIS.app/Contents/...
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2answers
778 views

Changing units project wide from 'Millimeter' to 'Map Units'

All my units in my project are in millimeter. But I would like to switch all units to map units at once without clicking every single signature. I also would like to have the possibility to directly ...
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0answers
510 views

Finding least cost path in QGIS? [closed]

There are a lot of questions for this method, but does not fit in my case. I have designed a network of roads, manually, and this is optimal. Max longitudinal grade of roads is 12%. (These are forest ...
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1answer
430 views

Create GRASS Mapset in QGIS 2.12

How do you create a new GRASS mapset in QGIS 2.12? The GRASS panel has only the Open GRASS Tools button.I don't see any way to actually create a GRASS mapset in QGIS.
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1answer
698 views

OGR error creating geometry for feature when deleting nodes

I have a line Shapefile that I need to remove many nodes from. Some I can delete fine, others delete but when I hit save I receive the following error: OGR error creating geometry for feature Using ...
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2answers
678 views

Resampling raster based on mask raster?

I want to resample rasters of e.g. 2 m resolution to the same raster cell size and projection of an existing raster (25 m). However I cannot really find answers how to do it properly. I managed to ...
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1answer
612 views

SSL error message using MMQGIS and Google Geocoding API

I have a large batch of about 9000 addresses that require geocoding. I've read most of the documentation, and have sectioned my data into chunks of 1000 to geocode using QGIS's MMQGIS Plugin. I also ...
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0answers
581 views

Update QGIS didn't solve error “NUMPY driver was compiled against GDAL 2.1”

When I tried "zonal statistics" with QGIS, I encountered the following error. ERROR 1: NUMPY driver was compiled against GDAL 2.1 but current library version is 1.11 I could find people who had same ...
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2answers
743 views

Counting buffer overlap in QGIS

For my thesis I'm modeling the identification of recreation areas. Therefore, there has been a survey where people were asked to specify where they recreate. They had to indicate this place on a map ...
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1answer
2k views

Obtaining Centroid from Polygon in SQL Server 2008 R2

I have several spatial layers created in QGIS that are held as spatial data in SQL Server 2008 R2. What I want to do is to find the centroid (OS Easting and Northing) of the polygon from the geometry. ...
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1answer
367 views

Topology in QGIS shapefile, GRASS and v.clean (nested polygons)

Following this: Nested polygons in QGIS overlap and don't show the real colour gradient I applied the GRASS function v.clean -> break as suggested by @ahmadhanb and the shapefile now shows ...
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2answers
670 views

Rasters loaded in Postgres/PostGIS using raster2pgsql contain blank lines

I recently set up an Ubuntu Server as a Postgres/PostGIS database server. In an effort to serve a collection of aerial photos to my colleagues, I loaded 608 GeoTiffs (non-overlapping 1km tiles each ~...
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1answer
441 views

Upgrade matplotlib used within QGIS

I'm using the Python Console within QGIS 2.14.3 (MacOS). When I import matplotlib, it imports version 1.4.3 from '/Library/Python/2.7/site-packages/matplotlib-override/matplotlib/init.pyc'. I would ...
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1answer
198 views

Unable to project GPM precipitation data correctly in QGIS?

After downloading the GPM (Global Precipitation Measurement) data from FTP, I tried opening the image in QGIS and I get a popup message saying CRS was undefined. As I know the projection is set to ...
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1answer
1k views

Adding a csv layer in PyQGIS

I am trying to load a series of csv files as vectors in PyQGIS. I run this code to try to get the first one: uri='file://D:/Saved Stuff/gulags/1.40.csv?delimiter=;&yField=y&xField=x' layer = ...
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1answer
336 views

QGIS 3.2 problem with Python console

I have QGIS Desktop 3.2.2 software already installed. When I open up the program I get the following error: Plugin processing: The plugin will be disabled because it crashed QGIS during last startup. ...
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1answer
515 views

Duplicate WFS Featues in QGIS 2.18.3

I recently installed QGIS 2.18.3. I loaded some WFS layers (1.1.0) I have previously loaded using 2.14.9 and noticed the record count had doubled (and one time they trippled but I can't replicate that)...
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494 views

r.in.lidar Error: 'Raster map not found' in QGIS 2.18.14 GRASS [closed]

First of all I would like to say, that I have checked all the open threads (with almost the same title) about r.in.lidar errors and in general GRASS and it's "raster map not found" errors within QGIS ...
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1answer
4k views

Use of file with '.dat ' extension

I dowloaded the climate data from this site http://catalogue.ceda.ac.uk/uuid/3f8944800cc48e1cbc29a5ee12d8542d and they have the extension .dat . I'd like to import the information in QGIS as raster ...
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1answer
362 views

How to load an (updating) point layer from Access?

I have a database table linked to the QGIS project which contains X,Y & Z coordinate information, which I can display in the Map View window of the project, after having used the “Points Layer ...
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1answer
3k views

Convert a .tif raster in .img format in QGIS

I have a raster file in .tif format and I want to convert it to .img with QGIS. Does anyone know how I could do that?