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

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2
votes
0answers
42 views

Converting from unknown coordinate system into common one using fiducial points?

I have a thousand of points that I want to project in a different coordinate system. These points were generated using an old and odd coordinate system (let's call it CS) so it's not possible to use ...
2
votes
1answer
46 views

Update column/Join in QGIS similar Mapinfo

Looking somewhat similar to UPDATE COLUM option ( for join) MapInfo in QGIS. This exists ?
2
votes
2answers
37 views

QGIS - How to determine the length of a KML line tracing

I have a KML file which contains a line feature representing the passage of an Optical Fiber connecting two cities. I can trace them nicely in QGIS and OpenStreetMap. I would just like to know how ...
1
vote
1answer
60 views

QGIS 2.14.1 Open Layers plug in Missing

I have installed QGIS 2.14.1, I am looking for Open Layers Plug In which I could not find under Install Plug ins as well as Web menu.
2
votes
1answer
41 views

Using Shortcut for QGIS Processing Script

I grabbed code from here to assign shortcuts for quickly changing to preset scales. When I did it for one shortcut, it was working - but then, when applying several ones it didn't anymore - though ...
2
votes
1answer
34 views

Does QGIS offer the possibility to identify overlapping features in a single WMS layer?

I work in QGIS 2.10.1-Pisa and use the 'Identify feature' tool to get the feature info of building polygons found in a single layer of a WMS. Some of these building polygons overlap. When I select ...
1
vote
0answers
30 views

Forcing polyline to offset from polygon border

I am currently working on a site with polygons and polylines and am looking for a way to ensure that the polyline does not overlay the site boundary. I am creating a habitat map and do not want the ...
0
votes
1answer
46 views

How to export a 3D map into a image file?

With qgis, it seems to be possible to visualize 3D with two tools : nviz and Qgis2threejs. But i would like export the result into an image file. Is it possible to do that with qgis?
3
votes
1answer
132 views

How to change a project variable using Python?

I'd like to change the value of a user-defined project variable (can be manually edited in Project Settings | Variables) using the Python console. I tracked down the setVariable() function in the ...
1
vote
1answer
72 views

How to cleanly upgrade QGIS on Windows?

I'd like to upgrade QGIS from 2.8.1 to the lastest LTR version. I'm looking for a clear explanation on how to achieve that on Windows (I'm on Windows 7). Such information is not easy to find, ...
1
vote
1answer
20 views

Export data from “Identify Results” table to Attribute Table

I am working on a street network in QGIS. I needed to increase the resolution of the street segmentation in an area of my network, so I copied and paste this area from another layer. I selected all ...
0
votes
1answer
51 views

Plugin with QT Creator and Python [closed]

I would like to develop a selection-plugin in qgis. It doesnt run because there is a Problem with the python script. I can select the layer. However, I dont know how can i choose between "ZD", ...
1
vote
1answer
45 views

Pythonic solution for changing shape files properties in QGIS

I'm loading several shape files into QGIS using the python console. The script works by reading a list of directories and a list of shapefiles to load from each directory, then it loads each file. ...
1
vote
1answer
47 views

Resample Raster File in Qgis [closed]

I have an Arc/Info image and I want to resample it in QGIS but I don't know how.. Anyone could help? I have already tried raster-> reprojection -> warp but it didn't work.
2
votes
1answer
23 views

Error message in QGIS using Timemanager

I am using QGIS version 2.14.0 (Essen) and have dowloaded the latest version of the Time Manager plugin in order to do some spatial-temporal analysis. I have imported a csv file into QGIS and made a ...
1
vote
0answers
54 views

Qgis C++ hello world example

i am new in developpement with C++, i try to realise an application with C++ which can read and display a *.qgs file from Qgis, i tried the code bellow but it doesn't work, it always show me errors ...
2
votes
1answer
25 views

How to filter in the attribute table within an attribute name?

I have to create a map with the corridor information in it (in German: Flurstücke). For that, I have one shapefile with the lines and another shapefile (points) with the information about the corridor ...
2
votes
3answers
70 views

DEM polygonize (raster to vector) doesn't work for contour lines less than 1 meter apart? (QGIS)

I tried to make polygon from DEM (geotiff) in QGIS. My requirement is that elevation value was every 0.5m of polygon. If I use the function polygonize (raster to vector) , polygon is created but ...
1
vote
1answer
41 views

QGIS Minidump on opening qgis file

I've a problem with QGIS and I don't know how resolve. A message error "minidump" appear when open a qgis file and I can't work. The QGIS is the new Essen version 2.14. Someone know how I can ...
2
votes
1answer
36 views

csv - CRS undefined, QGIS

I wonder why some csv files when imported (with long and lat) can not set a proper CRS system and other do (CRS undefined). For example: 1) if I export my data in csv with Microsoft Excel it does not ...
2
votes
0answers
39 views

QGIS 2.14. minidump crash when closing program

Every time I close QGIS, I get an error message like this: minidump written to C:\Users\name\AppData\Local\Temp\qgis-20160412-100443-7416-5376-ea85bef.dmp This happened also in the former ...
1
vote
1answer
31 views

QTiles generating blank tiles on QGIS

I need to generate tiles from shape files (which contain contour lines) I've loaded into QGIS. I'm trying to use the QTiles plugin to generate these tiles, but when I run it, it only generates blank ...
2
votes
1answer
47 views

Georeference automaticlly in QGIS

In ArcGIS the function called "Auto Registration" and it can automatically georeference raster Is there a way in QGIS to do the same? I seek in the transformation settings and in the setting ...
1
vote
0answers
14 views

How to export dynamic track (video) from QGIS?

Is it possible to export a file video with QGIS with a dynamic track from point A to point B? I need something like a presentation of a race where a dot is moving along the track from the start to ...
0
votes
0answers
25 views

Problems with QGIS 2.14.1 and GRASS 7.0.3 [duplicate]

I been having problems with modules GRASS / GRASS 7.0.3 in QGIS 2.14.1 I did the installation with Standalone Installer QGIS Version 2.14 (64bit) QGIS-OSGeo4W-2.14.1-1-Setup-x86_64.exe My OS: ...
1
vote
1answer
34 views

Reprojecting: trouble converting MapInfo data to shapefiles in QGIS

I was given a dataset generated in MapInfo. I need to use these files in QGIS, so I imported the .TAB files and saved them as ESRI shapefiles. I then realised the original dataset uses a custom "user ...
1
vote
0answers
29 views

Forcing labels to not overlap in QGIS?

Is there an expression that can be used to force labels to not overlap specifically when there are more than one label per point. I have a map that has over 1000 school names and I am printing it on a ...
2
votes
1answer
28 views

To see the geodata in a PDF is necessary to process something first in QGIS?

I want to see if a pdf file has geographic data and how to access them. In the properties of the PDF document I see the pdf file was made in "AutoCAD Map 3D 2013," and have 6 layers. In QGIS 2.14, ...
2
votes
1answer
18 views

QGIS CPP multi-platform plugin deployment

We're starting to look at porting some of our plugins over from ArcMap to QGIS and we're pretty excited about it. Currently everything we have is written in C++ so it would be nice to use that on ...
0
votes
0answers
27 views

QGIS : How to add points from GPS stream data

I try to place points on QGIS using the GPS plugin but it does not like me. GPS stream is good, I have the read on the data on port com 66, QGIS seems to be good with it since it locates correctly ...
1
vote
1answer
40 views

How to do diagram block with open source software?

I would like to do a block diagram (topographic and geological representation). Is it possible to do this with QGIS (or other open source software), in Windows 7?
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 ...
1
vote
2answers
71 views

How to add dynamic text feedback for QGIS plugin?

I am building a plugin using Qt Designer which will initially allow users to select features for a chosen polygon layer and then when a feature is selected on the canvas, the area is printed out in ...
2
votes
1answer
40 views

QGis QDir remove directory problem

I am currently developing a QGis plugin and I need to create and remove directories and I use PyQt. I don't know if my problem comes from PyQt or QGis. So my program creates folders, that works all ...
2
votes
0answers
42 views

QGIS : How to calculate centroid on polygons with holes

I try to compute the centroid of polygons with holes on qgis. I did not manage to do it directly, I had to make a conversion to convex hulls before extraction. I crashed my pgsql server trying to ...
0
votes
1answer
69 views

Finding Wgs84 coordinate from ascii grid and calculating scale over a slippy tile map?

I am currently trying to calculate the wgs84 coordinate from an ESRI ascii grid file, which the xllCorner and yllCorner coordinates are I believe in Cartesian coordinates, here is a sample of the ...
3
votes
1answer
39 views

How to order QGIS raster layer style?

I have single band raster files that I am trying to style using Singleband pseudocolour under the Layer Properties, Style settings, and a colour map textfile that I upload for styling. When I upload ...
0
votes
1answer
56 views

Convert shape into a shape file in QGIS

I seek for a way to convert, in the print composer, shape into shape file. I added rectangle in the print composer with "Add shape" function I try Rectangles ovals digitizing plugin, but in create ...
0
votes
0answers
17 views

Group points in polygons [duplicate]

How to group points into polygons? In Qgis if I want to render a point vector layer into a polygon layer, grouping all same colors.
0
votes
2answers
36 views

Group points and compute area

In a point vector layer, how to compute area for 4 defined ranges of values of one attribute? On the example below, I want the total area for each of the 4 colours.
1
vote
2answers
47 views

What method does QGIS Merge Rasters tool use?

I am trying to merge rasters in QGIS and want to set a priority order for merging so that the values from the highest priority raster are used in overlap areas (the “FIRST” merge/mosaic method, I ...
1
vote
0answers
32 views

Align Geotiff images in Qgis

I generated 3 drone maps of one area. The individual images were stitched using dronedeploy. Each map has some overlap with others. I imported all 3 geotiffs as rasters in Qgis and overlay them. ...
3
votes
1answer
63 views

QGIS 2.14 2.5d render appears different in composer and map views

I'm experimenting with 2.5d rendering for the first time. It seems to me that the objects are being rendered in a different order between the main working environment and the map composer. I'm ...
1
vote
0answers
36 views

Missing graduated method: size

I just can't find the size changing method for the graduated style. I have an integer containing column, and I would like to display it with icons which are bigger if the value is higher. So, is ...
1
vote
2answers
30 views

Using QGIS, how to save an attribute table as sqlite?

With 2.14.1 under Windows 10, I am trying to save a .dbf attribute-only table as a .sqlite table. However, the response is an error. My procedure: right-click the .dbf in the QGIS table of contents ...
3
votes
1answer
33 views

How do I export data points from topology checker into an attribute table?

I used topology checker in QGIS to find all dangles in my roads polyline shapefile. The topology checker returned about 528 dangling ends, also called errors. How do I save these points into an ...
2
votes
0answers
58 views

How to add plugin icon to status bar using PyQGIS?

I would like add my plugin icon to the status bar at the bottom of the screen. How would I do that? (QGIS API documentation on statusBar() seems to be leading to the QT docs and that site is down ...
2
votes
2answers
141 views

QGIS 2.14.1 Processing Toolbox GRASS 7 .NVIZ Not working

I have a problem with the command GRASS 7 .nviz in QGIS 2.14.1 installed through QGIS-OSGeo4W-2.14.1-1-Setup-x86_64.exe.md5sum all GRASS commands work exept .nviz / nviz7 images: I test with ...
9
votes
4answers
316 views

How to snap a road network to a hexagonal grid in QGIS?

I'm trying to use QGIS 2.14 to snap a road network to a hexagonal grid, but I'm getting strange artifacts. I've created a hex grid with MMQGIS, cells are approx 20 x 23 m. I've buffered the road ...
3
votes
1answer
88 views

Batch project creation

I have a list of csv files "name.csv" that I want to use to make various analyses in QGIS. I would like to automatize the following steps for each file : create new project name_main.qgis; import ...