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

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80 views

QGIS crashes when trying to make heatmap

I'm a new user of QGIS. I need to make a heatmap for my thesis and I'm fairly certain I downloaded and set up the program correctly via online instructions. I imported the GDX points and used a Google ...
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1answer
71 views

Errors while building grass-7.0.1 with Msys/MinGW

I need to build grass-7.0.1 for qgis on Windows 10 with Msys/MinGW. I succefully installed all packages from general and several packages from optional requirements. Here is my configure options (...
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0answers
51 views

How to group by attribute sum?

I have a polygonal layer, with adjacent and non adjacent territories. Each territorie has a population field. I would like to create a new polygonal layer based on location and attribute : adjacent ...
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165 views

How to properly config the Qgis Web Server and Web Client on ubuntu 14.04

I'm trying to properly install and config the web server and web client on an ubuntu machine (14.04) For now, I'm just testing it, to present later to my boss. I followed these links: qgis-web-server-...
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19 views

Generation and Visualization of Stacked Maps in Qgis software

We want to generate 3D stacked model of multiple 2D maps in Qgis software. We installed the PcraterMapstakVisualisation pluggin on the software but havent been able to achieve this. Kindly assist us ...
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91 views

Is there a way to draw polygons with a fixed area?

I am looking for a way to draw polygons with a fixed area. I am currently mapping farming options on field parcels. Some areas such as buffer strips run along features like rivers and hedgerows so ...
2
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0answers
22 views

Which FOSS label engine that supports shrink to fit label in polygon?

I've not found a way to label features using shrink to fit label in polygon, i've tried Qgis, and searched on Geoserver, Mapserver and Mapnik, none of them supports this feature, i'm looking for any ...
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1answer
153 views

What does v.distance calculate excactly?

As I am from an economics department, I am quite a beginner in QGIS. I read, that if I wanted to calculate the distance from a polygon to a point/line/other polygon, I should use the GRASS plugin "v....
2
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3answers
219 views

Making icons and text larger on high resolution screen for QGIS?

I have a new laptop with a very high resolution screen and can't get QGIS to work properly. Icons and text are too small. I tried to change the resolution, but had no luck. I also tried to ...
2
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1answer
240 views

How to count the number of pixels with a specific value of a .gif file in QGIS

So I have this .gif file that has values from 0-255 but not entirely grayscale. I tried the r.report and it does not work. I also tried the raster calculator like: "myraster@1"= 1 (because I want to ...
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0answers
205 views

Qgis Web Client Extended (gisapp) - problem with project loading

I need help because I can not find the solution to the following problem: I installed gisapp (Extended Qgis Web Client https://github.com/uprel/gisapp) but I can not in any way to view the projects, (...
2
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91 views

Error when using SAGA's “topographic correction” algorithm in QGIS

I'm trying to do topographic correction of Landsat images using SAGA's "topographic correction" algorithm from QGIS' processing toolbox. I was able to do it using Minnaert Correction with slope and ...
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1answer
79 views

voronoi / thiessen different CRS

I have the following problem in QGIS: I try to create voronoi polygons based on a shapefile (points; standard WGS84). The newly created voronoi polygons layer seems to be ok for the WGS84 CRS. But ...
2
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1answer
78 views

Integrate AT_GIS_GRID (NTv2 Transformation) in QGIS 2.8 & 2.10

Compared to previous versions in QGIS 2.8/2.10 no *.gsb-Files seem to be referenced in srs.db (for NTv2 Transformations) - did the system of using NTv2 change after QGIS 2.2 ? Wanted to integrate ...
3
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1answer
326 views

How do I open GRASS layers in QGIS

I'm quite a newbie to QGIS and GRASS.. I have installed QGIS 2.10.1 with GRASS 6.4.3 on my Windows 7 laptop and wish to open GRASS layers in QGIS. If I got it right, you can use the QGIS built-in ...
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0answers
28 views

Adding __init__.py in eclipse python interpreter' libraries

I am trying to Make eclipse understand the API in of QGIS. the __init__.py module is available in this address: C:\Program Files\QGIS Pisa\apps\qgis\python\qgis\__init__.py but when I try to add it in ...
2
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1answer
259 views

QGIS export to OpenLayers Python Error

I am trying to export a map with several Shapefiles from QGIS to an OpenLayers webmap. For that I tryed the "Export to Open Layers" and the "qgis2web" (Version 0.23.0) Plugin. I tried it before (one ...
3
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1answer
59 views

Using WFS to serve arcs / curves from ArcGIS Server to QGIS?

I loaded a wfs served by ArcGIS 10.0sp3 into QGIS. I got complaints that the arc were served as stroked arcs. Question: is WFS able to serve real arcs instead of stroked ones, or is the client (in ...
3
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1answer
149 views

Temporarily suspend snapping in QGIS

Is it possible to temporarily suspend snapping with a shortcut Key in Qgis, like its possible holding down space in Arcmap?
3
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3answers
846 views

Is it possible to build QGIS with qt5 without changing the code?

I wish to build QGIS using qt5. As told here (Can I use QGIS with Qt5?) it is possible with GIS 2.10. So i've loaded sources from here git://github.com/qgis/QGIS.git and switched to remotes/origin/...
2
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1answer
126 views

How can I add a Raster Calculator tool on QGIS Processing Modeler?

I'm trying to add the Raster Calculator to a model I'm creating using the Processing Modeler of QGIS 2.6 Brighton. It does not allow me to add the normal Raster Calculator tool under Raster, so I ...
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2answers
359 views

QGIS: How to remove small areas from a raster layer?

I have a raster with the extent of some sinks. Now I need to delete the sinks smaller than 10 squaremetres, because they are not important for my project. How could I accomplish that? (It's ...
2
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3answers
80 views

How to crop a river from a raster layer?

So I need to include the extent of a river into my map, but only have a raster file that shows the outline of the river with a blank (white) background: Is there any way to crop this file so that my ...
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2answers
136 views

Why does the OpenLayers plugin override the predefined projection?

What I am trying to say is: You import a shapfile into an empty QGIS and the QGIS environment gets the projection system of the imported shapefile. You import another shapefile into QGIS. The ...
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1answer
91 views

Unable to handle mouse hover in QGIS

I want to get map/layer information (no profile or lat/long) on mouse hover on popup in a QGIS map. I don't know how to do it, please let me know?
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0answers
59 views

How do I create a map of addresses?

This is a tricky one. A little context first: Bentiu wiki page: https://en.wikipedia.org/wiki/Bentiu + OSM map of Bentiu refugee camp, South Sudan: http://www.openstreetmap.org/#map=16/9.3314/29.7920 ...
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0answers
23 views

Python code error when using QGIS plugin Openlayers [duplicate]

I am getting this error message whenever I try to use the Openlayers plugin. I can not read or write Python particularly well at the moment, though I am trying to learn, so I am struggling to identify ...
2
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2answers
118 views

Splitting vector file by date (year) but column containing dates in Day/Month/Year format?

I am using national accident data in QGIS and quite frankly the dataset is huge as it contains every recorded accident between 2005 and 2014. I've split datasets by field for a number of vector layers....
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0answers
26 views

OS Open Source data tif files

I'm a new QGIS user and am having trouble adding tif files from OS VectorMap District. I get them on to the map but they always appear in the bottom left hand corner, which I would guess indicates a ...
2
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2answers
87 views

Is there a QGIS equivalent of inline variable substitution in ArcGIS?

I am working through some analysis in QGIS and need to iterate through a layer of points and buffer each point and then export to a new layer. I want the new layer names to have the values from a ...
3
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1answer
114 views

How to automatically assign current map scale to a shape created in QGIS?

In QGIS, would it be possible to automatically assign the current map scale to a feature created during an edit session and save it into a field in the attribute table? I have a series of OS maps of ...
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20 views

Does QGIS have anything like ArcMap Versioning? [duplicate]

I am just wondering if QGIS has anything like Esri's geodatabase versioning?
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1answer
76 views

Acquiring administrative country border data with a given resolution

I want to be able to find out which country a given (lat,long) pair falls into, but I don't need this to be extremely accurate and especially coasts can be quite crude as false positive hits will be ...
2
votes
1answer
140 views

Loading *.adf files into QGIS using Python

I am trying to write a loop to load .adf files into QGIS and create a contour map from each one. The response to an older question about loading .adf files (here: Loading *.adf files into QGIS?) was ...
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1answer
155 views

Select points within a buffer in QGIS

In my vector layer I want to select points within a buffer of 12 meters and with an exception (if 'Name' is not "James" than select). Is this possible with "select by expression"?
2
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1answer
108 views

QGIS modeler - how to use the parameter file?

I would like to add a field to all shp-files in a directory and calculate the area. I tried with the parameter "File" but didn't find a way to conncet this input to the other algorithm/operators.
1
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1answer
40 views

pyqgis: displaying 2 different datasets in one instance

I have a need to display 2 completely different sets of spatial data in a single standalone qgis application. This means, 2 separate sets of layers, 2 map canvases, etc. Is this at all possible? (...
2
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1answer
102 views

How to calculate focal range on XYZ DEM in QGIS or Spatialite

I have a XYZ DEM of a fairly mountainous terrain and would like to identify flat areas using QGIS. How can calculate focal range in QGIS? Or would there be a way to do this in Spatialite? Ideally, ...
2
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0answers
67 views

Geometry issues when digitising in QGIS

I'm digitising a large number of maps from hand drawn mud maps and digital images, and although I have used the snapping tools ("snap to vertex and segment", Tolerance 10 pixels, avoid intersections) ...
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0answers
32 views

Regarding QGIS Connectivity To Oracle

I installed QGIS long term release today first 64 bit and second 32 bit. My problem is that SQL Developer for Oracle a non QGIS product does connect to Oracle and when I use the same credentials in ...
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0answers
32 views

Custom form and field calculation Qgis

I wonder if it is possible using a custom form for field calculation to be carried out by means of a calculate button. I have 4 input fields, I enter in two fields manualy a number, after pressing ...
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0answers
27 views

Fill of sketch polygon blocks view of what I'm trying to digitize

I am trying to digitize polygons using QGIS 2.10.1-Pisa, but the red fill of the sketch polygon blocks me from seeing the imagery that I need in order to draw said polygon. I have tried going into ...
2
votes
2answers
150 views

Adding elevation data from contour lines to point layer using QGIS?

I want to calculate the number of vacant lots within 300m from a given building. My source file contains point layers of buildings and vacant lots. Here's a short description of my workflow. I've ...
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0answers
53 views

Creating Polygons of specific sizes

I am very confused! I have tried this afternoon to create a polygon of a set size, namely 30m x 1.8m. I need 33 of these set over a grid (which I have created on a vector layer). I've read ...
2
votes
1answer
77 views

Using environment variables in *.qgs-file

Is it possible to use an environment variable in qgis project file (*.qgs)? For example : <datasource>dbname='QBASE' host=10.1.1.1 port=5432 user=USERNAME sslmode=disable key='gid' srid=0 type=...
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0answers
68 views

Adding annotation from ArcGIS “Annotation Layer” JSON data to QGIS?

I know it is possible to add a vector layer into QGIS from an ArcGIS 'Feature Layer' - either directly from a MapServer query URI, or from a downloaded GeoJSON file. I would also like to add ...
2
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1answer
45 views

Accessing non-PostGIS Postgres instances from QGIS

Does anyone know if it's possible to query tables that are regular Postgres and not PostGIS with QGIS? I have a PostGIS database but want to access tables that aren't spacial - much like reading in a ...
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0answers
21 views

How to merge a 4 band tfwx file into one tif for use in Qgis [duplicate]

I have a tfwx file and when I open it in arcmap it is displayed as 4 bands. I would like to use the georeferenced file in qgis since I know nothing about arcmap.
5
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2answers
277 views

How to change the display order of proportional circles in QGIS 2.10?

I'm making a map with proportional circles based on point data. I want the biggest circles to be displayed below the others and the tiniest circles above. Unfortunately the default view is different : ...
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0answers
34 views

Import .shp into postgre using ogr2ogr

I'm trying to import a .shp into postgre using ogr2ogr but i'm stuck with an error with the select clause, any ideas? ##vsmap_path=vector ##millesime=number 2015 from qgis.core import * import os ...