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

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1answer
54 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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0answers
43 views

Grib file information to create QGIS projection

I'm trying to create a specific projection with QGIS (something like that: +proj=lcc +lat_1=69.75 +lat_2=52.87 +lat_0=61.31 +lon_0=7.665 +x_0=0 +y_0=720 +ellps=GRS80 +units=m +no_defs). I have some ...
2
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1answer
36 views

How to use create a plugin that contains a set of processing scripts using Qgis Script feature?

I have some script that I would like to share easily. I have read here that its possible to create a plugin using a set of scripts using "Scripts/Tools group in the Processing toolbox, double-click ...
1
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1answer
115 views

Regrouping points together qgis based on a sum

I work with QGIS and Python. I have a vector layer containing points. Each point has an attribute called 'number of houses' I want to dissolve this vector layer in many areas, each area must contain ...
4
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1answer
64 views

Calculating distance between points of the same layer

I am using QGIS 2.13 and a layer with hundreds of points. I need to calculate the distance to the nearest point... in the same layer. I tried the distance matrix but I get 0m since the "closest" point ...
2
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0answers
58 views

Raster Catalog QGIS; performance

Is there a comfortable way to generate efficient raster catalogs (such as in Arcgis), where polygon tiles are loaded as long as the scale does not hit a threshold value and images are only loaded when ...
5
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2answers
164 views

QGIS symbology: Change symbols outline color without loosing fill pattern

I have defined a layer symbology like shown in the screenshot below (categories are applicable laws however). The layer symbology is defined like this i.e. (no pattern fill): For these three ...
3
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0answers
51 views

Multiple watershed delination with QGIS

I am trying to divide a DTM model in subbasins but I have set specific outlet points for the subbasins, and not to use a thershold. Is there a tool similar to r.water.outlet but with multiple outlet ...
2
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1answer
62 views

select living-end-streets from a local osm-road-extract with QGIS

I am looking for a method or query to select living-end-streets from a local osm-road-extract. Living-end-streets are dead-end-streets for cars but cyclists and pedestrians can continue on their way. ...
2
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1answer
96 views

How do I style a GeoTIFF correctly in QGIS?

I downloaded the bathymetric data from GEBCO in geotiff format. When I load it in QGIS, the image is just completely grey. I am using QGIS 2.8. How I can visualize this data in QGIS?
4
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0answers
88 views

Raster calculator creates strange output

I am trying to combine two raster layers (one is nighttime satellite data, the other is the GPW population density data). I am using raster calculator to combine the two (the following is for a ...
1
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1answer
40 views

Statistical properties of raster image

I want to calculate mean and standard deviation of a raster image. In QGIS zonal statistics, we can calculate it within a polygon or a vector. But I want to calculate for whole image. In Python I'm ...
2
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2answers
57 views

QGIS Can't run any GRASS tools from processing toolbox

MAC OSX 10.11.13 New machine clean install of QGIS from Kyngchaos Installed Current version 2.14.2-Essen When I try to run a GRASS command e.g. v.clean I get the following error: This algorithm ...
2
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0answers
19 views

Recording track log in QGIS

I am using QGIS to record field data and also meandering field transects. When I was using ArcGIS I could turn on the tracklog function and a shapefile could be created of automatically generated ...
2
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0answers
20 views

SOL help in QGIS: rule based styling to show timestamp increase via gradient

I have some polygon data from a tractor that shows it's route among other things. It has a timestamp column which I'd like to use to show the route in which the tractor drove through the field via a ...
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0answers
24 views

Represent time with many maps and standard graduation

I want to represent trends over time. So I have 4 diferent maps (e.g. 95' 00' 05' 10') but my problem is in graduation. Is there any form to make the graduation with standars breaks and colors (e.g. ...
3
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1answer
20 views

QGIS older version to download onto a Mac ios 10.7.5

I am unable to download the newest QGIS to my macbook pro (2011, ios 10.7.5) because I need ios 10.8. Unfortunately, I am also unable to update my computer at this time. On th QGIS website there is an ...
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1answer
47 views

How do I file a QGIS bug report through alternative means?

I have tried to file a bug report per the instructions on the QGIS get involved page. Signed up for an osgeo account, but keep on getting kicked off. It could be my connection (Wireless DSL, wildly ...
0
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1answer
71 views

Spatial Joining in QGIS?

I'm new to QGIS and I'd like to know if exist in QGIS the equivalent command for "spatial join" of ArcGIS. I have tried with "join attributes by location" but seems to be impossible setting the match ...
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0answers
50 views

Shapefile and CSV coordinates don't match [closed]

I'm new to QGIS and still trying to get to grips with some basic aspects. I'm trying to create a map by combining a shapefile outlining London boroughs, and a CSV file with a series of records ...
1
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0answers
45 views

Shapefile layer export issue

I am using QGIS to define polygons in a shapefile layer which I am then exporting as an ESRI shapefile for use with JMP. The polygon layer looks correct on-screen in QGIS, but the exported files have ...
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0answers
25 views

Extract specific altitude curve from raster

Is there any way one can extract a specific curve from a raster DEM qith QGIS? I know I can extract all curves, specifying the desired altitude interval between curves. But I was interested in ...
3
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1answer
43 views

Concerning “Error when using r.series in a python script”

Based on the "Error when using r.series in a python script" discussion (Error when using r.series in a python script) and based upon the solution given by Joseph I tried to make the same but by using ...
0
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1answer
60 views

Creating a Vineyard Map with QGIS using Fishnet

In the vineyard there is a set number of rows, with a distance between each row and then the vines sit along the rows at the same distance apart. I have tried using a Fishnet to map the rows and then ...
1
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1answer
52 views

Projecting SHP file in QGIS [duplicate]

I have a DXF file of a building from AutoCAD. I saved this DXF file as a SHP file in QGIS. But this SHP file is converted from a plain DXF file and is not referenced/projected, it is drawn from ...
4
votes
1answer
60 views

Detailed changelog between minor QGIS version

What is the best way to know in detail what fixes have been applied to a certain new QGIS version? For example: what has been changed between QGIS 2.14.02 -> QGIS 2.14.03? I know of the visual ...
4
votes
2answers
57 views

Display multiple identical polygons (with different attributes) on map

I need to create maps of multiple species in a certain area. However sometimes multiple species occurr in the exact same area. This results in two identical polygons on top of each other. Many of ...
0
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1answer
79 views

Coordinates from Excel list

I'd like to import Coordinates from an Excel list, for this reason I saved the excel sheet as an .csv ant tried to import it via "Layer --> Add delimited text Layer". The points are imported, but with ...
1
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1answer
36 views

Move feature(s) causes points to be duplicated in QGIS 2.8.9

I have a point shapefile in QGIS where I am manually adjusting some of the points due to overlap. I am using Toggle editing --> Move feature(s) --> Save for all layers. Instead of moving the points ...
1
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1answer
23 views

Mark and Unmark legend in QGIS 2.8.6

I'm working in QGIS 2.8.6 with layers with legends with many entries.Is it possible to mark or unmark elements of the legend with a single click?
1
vote
1answer
36 views

Possible to set default attribute fields for vector creation?

I'm using the latest release of QGIS (2.14). Is it possible to set default attribute field parameters to be used automatically during the creation of new shapefiles/vector files? I'd be specifically ...
3
votes
1answer
110 views

Converting Road Lines to a Binary Raster Image

I got road data from the USGS database and imported it into QGIS. And I want to transform it into a binary raster image that looks like this in QGIS (this is only a processed screen shot but I want ...
1
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1answer
54 views

PyQGIS Processing - wrong number of parameters

I'm facing a very strange issue from the module Processing using it as a standalone (not in the Qgis python console). I'm trying to create voronoi polygons from a points csv file. I can load my file ...
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0answers
20 views

QGIS OTB : How to create .xml signature file of a vector file?

I am trying to do automatic segments classification, following this tutorial I managed to create the training shapefile (first red arrow). However, the next step is requiring "XML file containing ...
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0answers
25 views

QIS 2.8.9 - problem printing maps

I have a problem printing map out of Composer. I need to print Corine Land Cover but when I try to print the map, many of corine layers aren't visible on printed map. They are loaded in project and ...
2
votes
1answer
58 views

Is it possible and allowed to create a simplified QGIS version with custom interface?

At my institute we are revising and updating a methodology for participatory mapping of land degradation, that involves creating a simple land use map, subdividing each land use unit in a number of ...
5
votes
3answers
161 views

Determining coordinates of a SHP file

i have a SHP file of a building converted from a DXF file. This SHP file is unprojected and have no specific coordinates (origin 0,0). I find WGS84 coordinates (lat, long) of this building from Google ...
2
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0answers
41 views

QGIS break polyline into line segments

In QGIS (2.14.3.) how do I break polyline features in their consisting (single)line features? I have tried the 'Explode lines' geoprocessing tool, but this destroys the whole polyline into very atomic ...
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votes
1answer
63 views

Edit Shapefiles in QGIS [closed]

I have shapefiles which were created in Arcgis. I want to edit them in Qgis. Is this possible? and if yes how can it be done? Can I open Arcgis shapefiles in Qgis?
2
votes
1answer
67 views

Creating lines from points in QGIS, python error ( 'NoneType' object has no attribute 'asPoint' )

I'm new to Qgis, and i'm stuck with a simple task, I have a csv file with points coordinates and i would like to connect those points in a path, I'm working with wildlife movement data. i've tried ...
8
votes
2answers
177 views

How to set transparency to multiple raster values with Python

With the following code I can set 100% transparency to raster value 0: map=None for lyr in QgsMapLayerRegistry.instance().mapLayers().values(): if lyr.name() == "some_layer": map= lyr tr=None ...
1
vote
3answers
54 views

Importing CSV file to QGIS from Excel columns with formulas

I import a CSV file on Qgis. In excel I see an incription like that ¨54235¨ and in the attribute table in qgis as well as in notepad it looks like that ¨ 54 235¨ *not space but tab. The column when ...
2
votes
1answer
74 views

QGIS : See ID in polygons in ascending order

I have input polygons in shp, I assign id with $rownum but to display a label with the order isn't good. It seems to bind to the entry order. How to automatically change the id for them in order to ...
4
votes
1answer
55 views

How to create multiple buffers based on a list of values?

I am looking for a method to buffer geometries by passing a list of buffer amount values in QGIS. The resulting polygon layers should be suffixed with the buffer amount by some way. By passing i.e. (...
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0answers
44 views

How to create a distance from road raster in QGIS? (Maxent Bias)

I am trying to create a raster to show the distance from a road for an area in Australia. I have the Open Street Map data downloaded and converted to a *.SHP file. Is there a way to produce a raster ...
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0answers
21 views

Style graduated: Clases yes, Illustartion no [closed]

I joined "1980" (Fields on foto) with ¨municipal¨ (the blue one graduate) through ¨CVEGEO¨ value. Then I tried to illustrate with graduate style the AUTO_PARTICULAR value. Result: There is a ...
3
votes
2answers
118 views

Measuring length through a polyline in QGIS.

I'm working on a fiber optic project. I want to measure the length through a fiber optic cable (polyline) from a point. Does anyone have an idea to help me? For example, I'm at the point 082 CTO and ...
0
votes
0answers
10 views

Move whole layer to specific position in QGis [duplicate]

I have a layer that is supposed to be in EPSG:4326 but consists in fact of coordinates that are out of scope for EPSG:4326. Now I want to shift the whole layer to a specific position on the map (...
1
vote
1answer
26 views

QGIS buffer points, buffer amount in attribute value

I have a set of points in a shapefile with a real number attribute 'r' containing a radius (cp. screenshot below) and i would like to buffer these with amount of 'r'. As the result I expect a polygon ...
2
votes
0answers
31 views

QGIS add attachment to features [closed]

Is it possible to add attachments (pdf's, word documents et cetera) to features in QGIS (and not via a hyperlink)?