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

learn more… | top users | synonyms (1)

0
votes
1answer
67 views

QGIS - Labeling with expressions

some polygons in my map have a "name" (but no "capacity") and some have a "capacity" (but no "name") and some have both. I want to label the polygons with the "name" and the "capacity". Therefore I ...
1
vote
0answers
69 views

Locating Coordinate Reference System Selector on QGIS [closed]

I downloaded the latest version of GQIS last Friday(6/3/15). I can't locate the Coordinate Reference System Selector. I have tried clicking settings, custom CRS, add CRS, but can't find a way to ...
3
votes
2answers
253 views

Calculating unique ID value for a field in QGIS using python

I am trying to calculate a unique ID field for a vector layer in qgis, using python. I found some code to calculate attribute values, and tried to increment the value in the expression, but it doesn't ...
2
votes
2answers
121 views

Trouble with heatmap plugin in 2.6.1

When using the heatmap plugin, I am getting some insanely large numbers for the cell size field when setting the radius to 5000. I know that rows and columns are related to cell size x and cell size ...
1
vote
1answer
180 views

Exploding multipart features in qgis using python [duplicate]

I want to explode a multipart layer to singlepart in python. I see through the qgis gui there is a way to do it under vector--geometry--tools--Multipart to Singleparts.. which does what I need, I just ...
1
vote
0answers
22 views

Merge CSV file to Vector Layer using common attributes in QGIS python scripting [duplicate]

I have a vector layer and a delimited text (csv) file -- they both have the common attribute attribid -- how can I add the columns of the csv file to the vector layer merging on the the attribid key ...
2
votes
1answer
644 views

wine + LAStools in QGIS 2.8.1, Ubuntu 14.04

I can't get wine + LAStools to work in QGIS 2.8.1 (ubuntu 14.04). I only get the 22 open source functions that comes with QGIS. Outside qgis wine + LAStools works fine. My guess is that I am not ...
1
vote
0answers
295 views

Installing PostGIS Layer Viewer for pgAdmin III

I have difficulties installing pgAdmin's plugin PostGIS Layer Viewer. The official repository on GitHub gives this Web site for install procedure, then the former site gives this Web site for ...
1
vote
1answer
170 views

Trouble buffering a vector layer in QGIS with PyQGIS

I am working on a script that imports a .csv layer that has lat long coordinates, which I then want to buffer in feet. I've created a vector layer from the .csv file and tried to set the coordinate ...
0
votes
0answers
252 views

How to export a high resolution .tif of a map with QGIS Print Composer

I have an high resolution image of a map in QGIS using the print composer. It has 300dpi and the final map would be near 12gB big. The system is a virtual server with 128gb RAM, means there are no ...
1
vote
0answers
112 views

Create diagonals in polygon with QGIS or ArcGIS

How is it possible to create the diagonals in/of polygons and to calculate the length of this diagonals afterwards. It's for a lot of polygons so maybe a fast/automatic method would be nice. I ...
1
vote
1answer
59 views

Selecting Features from the results of topology checker in QGIS

Is there is any way to select or extract features from topology checker plugin in qgis?
1
vote
1answer
46 views

Enlarging polygons in a kml file

I have a KML file containing several hundreds of Polygon all around the globe, projected in lat/lon WGS84, decimal degrees. I need to enlarge all the polygons adding 23km at the top and at the bottom ...
1
vote
1answer
162 views

QGIS tool for aggregating population data in fishnet

I'm looking for a tool or method to aggregate a vector fishnet based on a minimum value. Specifically, I have a fishnet containing a population value and I would like to join together cells that ...
1
vote
1answer
102 views

Labeling outside polygon using QGIS?

is it possible to place a label automatically outside its polygon?
-1
votes
1answer
422 views

Which Qgis for OS X Yosemite?

Which Version of Qgis can I install on a Mac OS X Yosemite Version 10.10.2 ?
1
vote
0answers
59 views

How to activate the cursor once we deactivated by activating panning tool

We have activated pan tool on canvas using the following command: canvasPressEvent(self,event): if event.button == 1: qgis.utils.iface.actionPan().trigger() canvasReleaseEvent(self,event): ...
2
votes
2answers
167 views

Install GDAL frameworks and QGIS — redundant?

Just wondering if GDAL tools are actually already within QGIS -- was it redundant for me to install them on my OS X Yosemite independently? Recently I used GDAL tools to explode .kml data for use ...
0
votes
1answer
105 views

Re-projecting ground control points of similar images (Georeferencing in QGIS)

I have several maps to digitize. The base maps were Canadian NTS map sheets, all for more or less the same region. The useful information has been traced on top with handwritten markings. The maps ...
0
votes
0answers
68 views

Select feature within radius

I am developing a plugin (C++) and somehow I am stuck (I am very new to this). I start the plugin which has an own gui. There is a button to select features from the vector layer. Clicked on it, the ...
1
vote
1answer
192 views

How to store attribute values from a custom form into shape file?

I have created a custom form (for mapping bird species in the field with different attributes like species, type of observation, number of birds, date, ...) with some python logic. One important ...
1
vote
2answers
432 views

How to effectively merge SRTM 1 arc data?

We have around 1800 1 arc-second SRTM tiles (Geotiff). How to effectively merge all the tiles into one single file ? We are thinking about splitting 100 files per folder and merge them together using ...
1
vote
1answer
104 views

Python Code for generating random points not working!

I am trying to create some code to generate 10 random points within a vector layer's districts: layer=iface.activeLayer() import ogr import sys import random from shapely import wkb, geometry ...
1
vote
0answers
30 views

How to generate arcs from attribute data?

What I am trying to achieve is an ellipse-like shape from a digitised point location and cardinal measurements. For example, point location at 531500,181500 with the attributes North - 4m, South - ...
1
vote
1answer
59 views

Graduated values in symbology based on specific attribute in QGIS

I'm trying to solve the problem I've raised up in here.. I've rearranged the attribute table that looks like this: Important to notice is that the field "gruppo" is composed by 2 unique ...
1
vote
1answer
74 views

How to create landscape resistance map using path level spatial randomisation in QGIS?

I need to create a landscape resistance map based on path level spatial randomisation, as I have read in some research papers. Are there tools for this? I need to randomly shift and rotate the the ...
2
votes
1answer
97 views

How to add point features with coords taken from a .txt and show them on the map canvas?

Ok, so i am on Windows 7 and using QGIS 2.6 and i have a .txt file with some simple coords. I have extracted the coords to a list, no prob with that. But i looked at the PyQGIS cookbook on how to add ...
2
votes
2answers
267 views

How to automatically convert dots on paper maps to vector points?

I have several paper maps with dots that I need to convert to vector points. I was hoping to get some suggestions on how to accomplish this without recreating each and every point by hand. I know ...
0
votes
0answers
99 views

Splitting lines at a specified distance and add attribute

I have used QChainage to create points along a line every meter. What I am ultimately looking for, is to split the line layer along this point into segments with the chainage distance as an attribute. ...
1
vote
1answer
85 views

Attribute Table Missing Information

I'm taking a QGIS MOOC on Canvas, and in one of the labs we're to change layer style using an attribute table. However, the attribute table displays some very strange information on my system. ...
1
vote
0answers
175 views

SVG Symbols not showing up in QGIS

I have made sure the SVG path is set and that the path has SVG files: Settings->Options->System->SVG Path > "C:\OSGeo4W64\apps\qgis\svg" In Layer Properties > Style Manager > Marker ...
0
votes
1answer
88 views

What causes MetaSearch plugin Search error “Record serialization failed”?

I'm trying to use QGIS MetaSearch plugin to search data stored in our pyCSW catalog. Metasearch will get the correct service info and the GetCapabilities response however, when I try to search the ...
1
vote
0answers
33 views

Is there an automatic way to reduce the legend according to layer content?

I have style-file with max. amount of types. Some shp-Files doesn't have alle these values. When I load the sld-File there always drawn the max. count of the values. Is there any automatically way to ...
1
vote
0answers
69 views

Trouble importing qgis.core python module

I am having issues loading the qgis Python modules in the osgeo4w shell. Ultimately I want to work with the modules in pyscripter. I tried the solution mentioned in Problem with import qgis.core when ...
3
votes
1answer
420 views

Intersecting lines get crossings

I have a set of lines representing bus lines. Some of the lines are overlapping and take the same roads. I am able to extract the nodes. However I am interested in extracting only crossings like ...
1
vote
0answers
333 views

QGIS Server - Internal Server Error at GetCapabilities reguest - no Apache error

Maybe the question is answered often before, but i can't find a solution which works on my system I try to install qgis server by the tutorials by using the following links ...
2
votes
0answers
91 views

QGIS 2.8 Raster Layers Moved [duplicate]

I recently downloaded QGIS 2.8 and opened an existing project in it to check how it handled it and make any changes required. This project includes several raster heatmap layers. My problem is that ...
4
votes
3answers
3k views

Importing SVG symbols into QGIS

I've downloaded the SVG icon pack here: https://www.mapbox.com/maki/ How do I import these symbols into QGIS? As far as I can tell I need an .XML defining each symbol. Also using the Import from ...
0
votes
2answers
632 views

Create DEM with 1 foot contours from lidar data with 1.4 meter resolution

I have Lidar data which contains multiple .las files for an entire quad. I have figured out which .las is the area I am looking for. I was told the data is in 1.4 meter resolution and would work to ...
1
vote
1answer
159 views

Georeferencing an old map in QGIS using Thin Plate Spline

![old map georeferenced badly][1] [1]: I georeferenced this old map using Thin Plate Spline, and Cubic Spline as transformation settings. However, the result was quite bad. Do I have to add points ...
1
vote
0answers
92 views

Dissolving polygons with common attribute within certain proximity to each other using QGIS?

I have a land parcel with a lot of polygons with the same attribute (owners). I would like to dissolve all the polygons with the same owners but only if the polygons are within 100m of each other. How ...
1
vote
1answer
58 views

QGIS Categorized Symbology based on joined table

I am trying to create categorized symbology for a data layer. The column that I would like to base the categories on is a result of a table join. For some reason it isn't working. All of my polygons ...
0
votes
0answers
97 views

CRS, pixels, and floor diagram

I am trying to create a building diagram for use in a DevExpress map control. My goal is to display a raster image background in the control with a vector overlay that defines features of interest. ...
1
vote
0answers
37 views

Displaying directional bandwidths in QGIS

I have a traffic model and want to display the results in QGIS. I have a shapefile for the road network and can easily annotate the flows onto this. However, I want to display the information as ...
3
votes
2answers
141 views

How to access checked layers in PyQGIS?

qgis.utils.iface.activeLayer() accesses the current active layer, but I would like to get all checked layers in the QGIS ToC. How can I do it?
0
votes
0answers
95 views

How to set a print composer title from attribute table field in QGIS?

I have a point layer with several fields (pollutants values). I've created a point layer for the atlas composition (a mean coordinate point layer, 5 points, 1 for each areas). I've used a graduated ...
1
vote
0answers
221 views

How to install pygame or Tkinter for QGIS Python?

So i have downloaded pygame and installed it. Now i want to write scripts and run them through the QGIS console that implement methods of pygame but when the console reads "import pygame" i get a ...
5
votes
1answer
322 views

How do I save topology errors in QGIS?

I'm currently doing a project on finding blocked roads in a road network layer. I've figured that I can use the topology checker with the rule 'must not have dangles' and find them this way. But I ...
10
votes
2answers
2k views

Why are heatmaps on qgis 2.8.1 produced in the wrong CRS?

I noticed that the heatmap calculation on the new upgrade version of qgis is given the raster map without any coordinate system. Have you got the same problem?
4
votes
2answers
127 views

Is it possible to copy a graduated scale from a polygon to a point layer in QGIS?

I have a polygon layer (represented by cells) and a point layer. I've used the graduated symbology with the polygon layer. Now I'd like to export this graduated scale to the point layer. The field of ...