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

learn more… | top users | synonyms

4
votes
1answer
714 views

Why are the polygons in my GML not rendered?

I tried to view GML files from download services ( http://services.cuzk.cz/gml/inspire/cp/epsg-5514/ ) and I have a problem with viewing of polygons from layer "CP:CadastralParcel". This Layer ...
4
votes
0answers
386 views

How to debug Quantum GIS PlugIn Visual Studio DLL?

I have developed a Quantum GIS plugin layer using Microsoft Visual studio and placed it in my plugins folder of my customized QGIS application. I now intend to debug the DLL using Microsoft Studio. ...
4
votes
2answers
1k views

GPS-Plugin and Garmin data

I am an avalanche specialist and I use a GPS Garmin 62 for fieldwork. I for example use waypoints to measure snow depth in avalanches for volume calculations. When I add a waypoint in the garmin ...
4
votes
1answer
722 views

QGIS custom CRS for map of manufacturing shop floor

I'm working on a web app that shows a map of a manufacturing plant's shop floor. I've built it in Inkscape and QGIS, but when I try to load it into Tilemill, I get a CRS error. Specifically, it ...
4
votes
1answer
2k views

Qgis - How to change GDAL version

im working on Ubuntu 12.04 server; i noticed this when i installed additional support for ECW format into the GDAL 1.9.1 which worked ok. Then i tried to add ECW files to Qgis but it said they still ...
4
votes
1answer
2k views

Python 3 support in QGIS?

As python3 is getting standard more and more I wonder wether there is or will be support for python 3 in QGIS?
4
votes
1answer
3k views

Performing Geoprocessing SQL Queries in QGIS from a PostGIS Database

This may be a dumb question, but is there way to run a PostGIS geoprocessing SQL query in QGIS? Specifically, I am thinking of running SQLs such as ST_Union, ST_Split etc etc. I have tried the ...
4
votes
1answer
258 views

Is it possible to change the year range of time manager in QGIS?

I have a shapefile with a start and end time field, properly formatted. However my dates range from 1864-1995. When I try to use the shape file with the QGIS time manager plugin I keep getting this ...
4
votes
5answers
1k views

Elevation correction ASTER GDEM2 (+10m)

My ASTER GDEM2 has a average elevation error of -10m for my area. (I testet it using 90 defferential GPS reference points and compared it with old Topo25, SRTM, and GoogleMaps). I would like to ...
4
votes
1answer
2k views

How to open or import .sdc files in QGIS?

I have some .SDC files i want to look at but i dont have arcview installed. is it possible? i couldnt even find a software that does sdc to shp conversion. any idea? i am using qgis 1.7.4 on both ...
4
votes
2answers
651 views

Fixing raster with wrong Eastings using QGIS and GDAL?

I get an error when trying to warp a tif file in QGIS: ERROR 1: Too many points (35721 out of 35721) failed to transform, unable to compute output bounds. I am using QGIS 1.7.0 Wroclaw with ...
4
votes
1answer
1k views

Can QGIS resample Rasters during display?

When I was using ArcGIS a user could resample a raster during the display (I think via layer properties under the display tab). This would smooth the appearance of the raster so it wouldn't appear ...
4
votes
2answers
886 views

Plugin for average distance from node to polyline in QGIS?

Is there a plugin available that will calculate this? EDIT 1: The red polyline is the average distance of the point to the black polyline. The red polyline is what I want to display. Alternatively, ...
3
votes
1answer
59 views

Coordinate points not lining up with a preexisting map on QGIS

I asked this question once before, but I did not receive any feedback on solving on the issue and I am still confused as to what I am doing wrong. I found a public domain map of Florida counties on ...
3
votes
1answer
62 views

Export raster layer in python to specific folder

I am trying to export existing raster layers as tif files. I just want to avoid saving each raster manually. this is the code I am trying to use, but it doesn't seem to work: from PyQt4.QtCore import ...
3
votes
1answer
42 views

How to add label to point without marker displaying in QGIS with python

I'm using a python script to manipulate the display of shapefiles in QGis. My code basically selects an active layer and sets a field as the label of the point. Like this: layer = ...
3
votes
1answer
43 views

How to display different SVG icon in the same layer in QGIS based on attribute value

Based on this question: How to display different SVG icon in the same layer in QGIS is it possible to add multiple svg files in qgis to the same layer automatically based on attribute value? I have a ...
3
votes
1answer
42 views

PyQGIS Error: Cannot Create a QPixmap or Qwidget when no GUI is being used

I am trying to create a standalone script using the code below. I was able to add a shapefile with no errors but when I add map = QgsMapCanvas() after qgs.initQgis() and ...
3
votes
2answers
116 views

QGIS live GPS tracking /recommended hardware (GPS USB stick)

Is there a list or any other recommendation of certain GPS hardware (esp. GPS USB sticks) working with QGIS? I have been off this topic for far over a decade, and i remember that in former days not ...
3
votes
1answer
52 views

Print composer custom grid label problem

In answer to this question Klas Karlsson puts forward a solution to the problem of formatting print composer grid labels for projected maps. I'm very weak on scripting, but in QGIS 2.14 I've tried to ...
3
votes
1answer
86 views

Creating executables from Python using OSGeo4W shell

I've been trying to create an executable from my Python script and using the OSGeo4W.bat shell. I tried py2exe but it returns an access denied error. Previously I've written executables using py2exe ...
3
votes
3answers
63 views

Unexpected behaviour using ST_Equals() with QGIS

Let's say there is a table 'polygon_a' and a table 'polygon_b'. Each table contains three polygon features. The polygon features are spatially equal. CREATE TABLE polygon_a ( gid serial NOT NULL, ...
3
votes
1answer
40 views

Distance matrix tool, how to include distances at 0 metres?

I have used the Vector -> Analysis Tools -> Distance matrix to merge two datasets by the closest points. But in my output csv file, the points that match exactly, or that has 0 metres between them ...
3
votes
1answer
166 views

PyQGIS couldn't import processing with standalone script

I have read post on that problem (How can I access `processing` with Python?). The problem is even with a sys.path.append it couldn't import processing. It's very frustrated. Here the code I used: ...
3
votes
1answer
94 views

Use “facet_wrap” in ggplot2 with QGIS?

I'm using QGIS 2.6.1 and R version 3.2.2. I'm struggling to get the syntax on a R Script for creating plots via QGIS processing to work. My understanding is that R syntax in QGIS Processing is ...
3
votes
2answers
189 views

Couldn't add a column to attribute table (GPX layer) | QGIS

Running QGIS 2.10.1 on Ubuntu 14.04 x64. Going to add a column to the attribute table (GPX layer) but couldn't select any type. Then, failed - "Failed to add field 'NameTest' of type. Is the field ...
3
votes
1answer
183 views

Postgres, loading raster into db and visualize with qgis

I'm trying to import a TIF raster into a Postgres db using this command: Raster2pgsql -s 26591 -I -C -e -Y -F –N -M C:\Users\Ivn\Desktop\Postgre_HOME\scratchmres1.tif -F | psql -U postgres -d ivndb ...
3
votes
0answers
141 views

How can I properly rename a table in a SpatiaLite DB?

Spatial layers (tables) in SpatiaLite include various supporting objects and metadata, including triggers, indices, and entries in (at minimum) the geometry_columns table. I'm looking for (preferably) ...
3
votes
1answer
128 views

Where did Processing Algorithms go?

I have recently installed QGIS 2.8.2 on my Windows 8.1 laptop with the stand alone .exe installer. The processing toolbox is missing the GDAL/OGR, GRASS, QGIS algorithms, Saga and the Orfeo Toolbox ...
3
votes
1answer
256 views

Copying attributes from point layer to memory linestring layer PYQGIS

I've stacked a little bit with copying attributes. I have a Point Layer created from .csv file. For each feature in this layer, I'm creating a new Polyline geometry in memory layer. Cannot add ...
3
votes
1answer
302 views

Performing viewshed analysis with Dutch AHN files in QGIS?

i downloaded the new (dutch hight data) AHN files, and was trying to perform a viewshed analysis at some point near UTRECHT. The plugin (grass plugin) works ok, i tried it before with a dem map. ...
3
votes
2answers
249 views

Understand QGIS errors when importing .csv file

I am trying to import a .csv file as a layer in QGIS and keep getting a number of errors that I don't understand. Is there any documentation of QGIS errors available? Or can you point me towards a ...
3
votes
1answer
433 views

QGIS Join Attributes by Location not working from Python script

I have a shapefile with points, and a shapefile with polygons. I want to sum the attribute value of all points that are within a certain polygon, and I'd like to do this for each polygon in my ...
3
votes
3answers
1k views

Creating Conditional Statement in QGIS Field Calculator

I've looked up some of the other threads on this topic, however, none have addressed what I am seeking to do. Essentially I have a large data set and I would like to search one field for any values ...
3
votes
3answers
183 views

Procedure putting online a graveyard in a GIS

I would appreciate some advice. I’m not an expert in GIS but recently I studied a bit, came on different sites. Among others QGIS, MangoMap, ArcGIS, … etc A group of 6 small towns in Belgium wants to ...
3
votes
2answers
1k views

Cost Distance Analyst In QGIS?

Are there any tools, plugins or methods in QGIS which allows for an analysis of the best path between two points using least cost path method? As shown below ArcGIS has several distance tools.
3
votes
0answers
240 views

qgis 2.8.1 - processing gdal 1.11.2 error (mac, 10.10.2)

i've just recently installed qgis 2.8.1 on my mac. including all relevant packages from kyngchaos - i.e. GDAL Complete 1.11 framework package, Matplotlib Python module, numpy - and updated python to ...
3
votes
1answer
766 views

QGIS 2.8.1 OpenFileGDB compatibility with ESRI FileGDB?

I am trying to view an ESRI FileGDB in QGIS 2.8.1. Do I have to use "add vector layer" - "directory" - "OpenFileGDB" in order to open and view the data? Is there a way to specifically open the ESRI ...
3
votes
0answers
370 views

Create Thiessen polygons using spatially weighted averages?

I have to create Thiessen polygons with the spatially weighted averages for specific contaminate concentrations from different borings. I have the Thiessen polygons created but this only shows me the ...
3
votes
0answers
294 views

Why does field calculator compute area in square meters?

I am using EPSG:102748, and have set my Settings/Option preferred measurement units to ft. My CRS is NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet, and when I use the measure tool, it returns ...
3
votes
1answer
1k views

How to snap lines to nearest point?

Is there an easy way to snap lines to nearest point of either a line or a polygon? I don't see any snapping options for line layers as suggested on How to merge lines with slightly different endpoints ...
3
votes
1answer
1k views

How to create a missing dbf file for shapefile?

I have a shape file (shp) which is missing its dbf. I tried to load this into Postgis using shp2pgsql and got the could not open shapename.dbf error. I opened it in QGIS, without issue, and ...
3
votes
0answers
296 views

SAGA is not working within sextante (QGIS processing installed in Ubuntu)

Recently i decided to start working in Ubuntu (version 14.04). My first step was to add the ubuntugis-unestable repository, and then proceed to install SAGA, GRASS, OTB, QGIS and the bindings between ...
3
votes
2answers
228 views

How to merge same long lat points with different data into a unique one?

I have a layer where there is more than 1 feature for a same object. Imagine i have a layer called signals. There can be up to 10 features in the same place (long/lat) for a unique signal but the ...
3
votes
4answers
4k views

QGIS OpenLayers 3 Google Maps not zooming

Google Satellite will not zoom. Although the scale changes as I zoom, as the map is re-rendered, it zooms out to its maximum extent every time. This first happened in the latter part of November ...
3
votes
3answers
2k views

Why can't I open .asc files in QGIS?

Further to my earlier question, I have .nc and .asc files of crop area and production for maize, rice and wheat. It says here, about QGIS importing .asc files: QGIS has native support for this ...
3
votes
0answers
35 views

Action: Move pointfeature to other layer - Point becomes Multipoint

I'm trying to write an action that moves a pointfeature from one layer to another. It works fine until i try to save the layer with the new feature on. He says he can't save a MULTIPOINT to a ...
3
votes
1answer
296 views

Will core functions in QGIS 2.6 exploit multi-threading?

After reading a recent post about introducing multi-threading to QGIS, I was wondering if QGIS 2.6 will include this when running various processes. I checked online and I could only find that ...
3
votes
1answer
50 views

multi-line attributes in composer

I have a multi-line text attribute in one of my layers, but when I try to display the data using the 'add table' function in Composer, it just gives the text a single line, not enough room to fit. ...
3
votes
4answers
2k views

How to create a new Shapefile with the same attributes as an existing one?

It is quite a frequent occurrence that I want the data I'm about to add to a new shapefile, to have all the same attribute fields as one I created in a previous project. For example, I might have ...