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

learn more… | top users | synonyms

3
votes
1answer
48 views

Rule based polygon fill in QGIS

I'm really quite new to QGIS, I want to style polygons fill with raster imagws based on a attribute contained in the property table. What do I have to write in the description in order to get for ...
1
vote
1answer
32 views

How to load vector files from file path in QGIS?

We have around 500 files in different folders. For QC purpose, we've selected 25 files(we have the list of files/path in excel) out of those 500. Is it possible to open all those 25 files(it might be ...
3
votes
1answer
100 views

Automated count for attribute table elements

I need your help for extrapolate from an attribute table the number of elements divided for categories in an automated way (it's not possible to count them manually cause the number is quite huge, ...
3
votes
3answers
109 views

How can I delete Shapefiles in QGIS?

In the Browser it's not possible to delete Shapefiles. In ArcMap you can delete Shapefiles easily within the Catalog. How can I delete Shapefiles in QGIS without minimizing the QGIS-Window, navigating ...
3
votes
0answers
42 views

Changing colours in SVG symbol using QGIS?

I am using QGIS version 2.14.1 (Essen), and I have imported a traffic cone symbol in SVG format to represent some of my data. I was wondering if it was possible to change the color of this symbol ...
1
vote
0answers
21 views

Offsetting polygon borders where they share border in QGIS?

Say you have 2 polygons with different coloured borders, where the borders are shared the colour is problematic. How do you offset/separate them in QGIS 2.10.1?
1
vote
1answer
23 views

Creating new layer using selection from attribute table in QGIS?

How do I create a new layer using a selection from an attribute table in QGIS 2.10.1? Previous answers on this topic do not help -perhaps because they relate to older versions of QGIS
0
votes
0answers
24 views

How do you line up a pre-existing public domain map with csv coordinate points on QGIS?

I have been struggling with this simple problem all day. I found a Florida map with the counties on Google for GIS. I uploaded the map to QGIS with no problem. However, whenever I try to upload points ...
1
vote
2answers
23 views

How to NOT show decimal values in tilemill when using gdal_contour generated contours?

following problem has troubled me for two days now and I can't find a solution: I am using QGIS to generate contour lines from srtm dems. Export these as shapefiles and load them into tilemill on top ...
1
vote
0answers
12 views

“Select a tool” error Saga: Accumulated cost (isotropic)

I'm trying to run Saga's accumulated cost operation in QGIS on a DEM and set of raster destination points, but keep receiving an "Error: select a tool" in the log after a failed run. There are no ...
2
votes
1answer
28 views

Qgis - How to count text values

My issue is to count text values from vector layer. I got a layer with streets for one of administrative region and it's names in column. It looks like this Id Street_name XYZ XYZ ABC XYZ . . . ...
4
votes
3answers
123 views

How can I make an attribute table field automatic?

I´m working in a way to make hydrologic projects using QGIS and an Excel worksheet that i have. To do this, I want to extract some information of the lines, included in a vector layer, which ...
3
votes
0answers
27 views

How do I limit the number of labels for similar objects in QGIS?

I'd like to reduce the clutter in this map by limiting the spacing or number of times that a particular label can appear. For example, the label 'US 15' should not appear within some set distance ...
2
votes
1answer
52 views

Merging polygons

I am trying to merge together two polygons to create a polygon of the whole UK. However, I can't seem to select more than one polygon. Also it seems to be random as to which polygon will be selected. ...
2
votes
1answer
38 views

Module Map Composer not found

I am using Map Composition, but I found in QGIS 2.14 (Essen) Text Editor that when I try to import MapComposerit returns that this module is not found. This is the error : File ...
2
votes
1answer
25 views

Corners of GeoTiff's not lining up after doing gdalwarp EPSG:3006 -> EPSG:4326

I have some GeoTiff's that are in EPSG:3006 (SWEREF99 TM) atm, and I'm trying to convert them to EPSG:4326 (WGS84) because some other software needs it in this projection. But after doing the ...
2
votes
0answers
47 views

QGIS Processing algorithms have encoding problems

I use QGIS 2.14.1. I add vector layer from UTF-8 encoded geojson, which is read fine and attribute table show correct characters. If I use QGIS algorithm on this layer (i.e. clip, voronoi, etc) I ...
3
votes
0answers
22 views

QGIS crashes when selecting symbols

I am using QGIS version 2.14.1 (Essen). I can open it no problem and load shapefiles correctly. However, when I go in the file properties and select "style"/ "unique symbols", the system crashes and ...
2
votes
2answers
87 views

Is it possible to restore lost PRJ-Files?

Currently I am working on a project with QGIS (2.14.1). Therefore I need to add old (but important) shapes that were drawn by a colleague. Somehow most of the .prj-files are missing - I don't know ...
2
votes
2answers
53 views

I don't get any output from Reprojection

I have recently posted a Reprojection issue. I found the solution, but now I can't get the output: I load the resulting reprojection by code, but first, I look into the folder where I have indicated ...
1
vote
2answers
40 views

Animating polygon style over time in QGIS?

I have a shapefile, consisting of polygons. I can join a layer to a database file, and use an attribute (database value) to "style" (color in) the polygons to give me a visual representation of the ...
2
votes
0answers
24 views

How to set style for features within atlas feature

I have a vector layer with property parcels, and another vector layer separating them into regions. I have the regions layer controlling an atlas. I would like to have only the parcels within the ...
1
vote
0answers
21 views

QGIS: How to create a crosstab using SAGA toolbox cross calssification and tabulation?

I am trying to use Cross classification and tabulation SAGA toolbox. I have a raster DEM file (14 classes) and raster file precipitation (13 classes). I want to do cross-tab - but I don't know how ...
3
votes
1answer
60 views

How to fix label contour lines layer displays on top of all layers in QGIS

How can I fix the situation, when the label contour lines displays (on top of all layers) on top of this layer? QGIS 2.15.0-Master
1
vote
1answer
54 views

Import PNG symbols in QGIS

I would like to upload some symbols into QGIS using version 2.14 (Essen). I would like to upload a PNG but it seems the only format available is XML. Do you know if its possible to upload PNG's ...
1
vote
0answers
82 views

Getting Started With QGIS? [duplicate]

I am a fairly strong user of ArcGIS, having started with version 8 long ago. But I'm looking for an inexpensive alternative right now for a client, and I want to investigate QGIS as a possible ...
1
vote
1answer
32 views

How can I calculate the canvas scale in QGIS print composer?

Using the atlas functionality in QGIS 2.14 The canvas scale varies according to the object in question (national parks). I want to have a numbered scale based on the canvas print size. I tried using ...
0
votes
0answers
23 views

ArcGIS rest request for extent in QGIS

I'm trying to import an ArcGIS rest service for a specific extent, and I can't seem to find the format of such a request in QGIS. In the tutorial on the QGIS site I see appending ...
2
votes
1answer
46 views

Algorithm fails (not found) : gdalogr:warpreproject

I am using the code in "QGIS Python Programming Cookbook", testing the code to learn about programming in QGIS. But when I try to reproject a raster, I get the error: Error: Wrong number of ...
1
vote
1answer
42 views

How to pythonically set a symbol as an ascii character (Font Marker) in QGIS

I need to set a point on a map as an ASCII symbol with python. I'd like to do this in a rule based renderer. something like: rule.setSymbolAsFontMarker("✫") So I'd have something like this in my ...
1
vote
0answers
48 views

QGIS 2.14 Linux/Ubuntu GRASS algorithms - This algorithm cannot be run :-(

Does someone else have the problem that GRASS Tools don't work in QGIS 2.14 Toolbox ? Error: "This algorithm cannot be run :-(" GRASS7 is enabled in Toolbox options and installed (with QGIS-GRASS ...
1
vote
0answers
18 views

Qgis simple line vertex geometry and Z values

QGIS 2.8.4 - utility networks postgres 9.3/postgis 2 database The linear network is made up of simple lines joining points that have different z values. For each feature in the line layer's table I ...
2
votes
0answers
30 views

How do I report area statistics for land cover classes at equal sections along a river?

I have a river outlined: Using QGIS, the Semi-automatic Classification plugin and Landsat 8 images I classified the habitats (blue=water, yellow=sand/rock...,green=vegetation/algae) inside the river ...
2
votes
0answers
27 views

not all OSM polygons downloading in QGIS

I have been trying to download all of the polygons contained within OSM for a particular extent of the city. When I do this through > Vector > OpenStreetMap > Download Data, however, many polygons ...
1
vote
0answers
23 views

Using “Ruled Based Render” to display labels without the marker with python in QGIS

I'm writing a script to load and manipulate some shapefiles. Unlike my previous question I now need to display labels only on certain zoom levels. My usual result is that the previous formatting gets ...
2
votes
1answer
32 views

Export google satallite raster in QGIS 2.12- problem

When I import aerial raster from Google satellite, using the OpenLayers plugin the raster is located in the right place. But when I export it the raster isn't located in the right place: I ...
1
vote
2answers
67 views

QGIS 2.14 Essen Scale Setting Problem

The scale of the canvas plot shows in the status bar as everyone knows. However If I want to change the scale it refuses to work properly. This occurs whether I select a scale from the drop-down menu ...
1
vote
0answers
30 views

QGIS 2.14 atlas legend not resizing

I have an atlas in QGIS 2.14 with a filtered legend whose position is anchored at the bottom right corner. When viewing atlas pages individually within the print composer, the legend size increases ...
2
votes
1answer
58 views

Cost Distance Map in QGIS

My question is very similar to Cost Distance Analyst In QGIS? However, I'm looking for a means by which I can create a raster displaying the cumulative cost of each pixel to a specified destination ...
1
vote
0answers
27 views

qgis snaps to outside instead of boundary

I have polygon layers that I need to be covered by other polygon layers, and many of my inner layers have a vertex on the border of an outer layer or in some cases they share an edge. Both ST_Covers ...
3
votes
1answer
31 views

Positional join with multiple overlaying geometries, each containing a different attribute

I can't find any documentation on how a spatial join in QGIS is working on the following situation: An area layer is being spatially joined with a polyline layer in order to compare attributes of ...
1
vote
1answer
52 views

Installing and using ArcGIS REST API Connector plug-in?

I downloaded this plug-in http://plugins.qgis.org/plugins/connector/ from the plugins link at QGIS.org and it unzipped into a folder entitled "connector" in my "downloads" folder (running Mac ...
1
vote
0answers
26 views

Densification of Point Layer to get smaller Voronoi Areas

I'd like to densify a point layer to get a better spatial distribution. With "better" I mean homogeneous distributed. If I had to quantified my improvement, I would calculate the voronoi diagram and ...
1
vote
0answers
36 views

Python error in Qgis 2.14.0

I'm trying to build virtual raster (catalog) following instructions from the documentation in QGIS.. It appears the following error in python code: 2016-04-17T12:13:07 1 Traceback (most recent call ...
1
vote
0answers
32 views

Problem of resolution - conversion vector (points) to raster QGIS

I continue the following of the first problem : How to convert points to a raster in QGIS (rasterize does not show z field)? My goal is to create outlines watershed at a resolution of 5 min (10 km) ...
1
vote
1answer
33 views

Reverse geocoding with QGIS

I've downloaded us region boundaries from US census bureau, which is a .zip file. I can open to view the file with QGis as follows (4 regions + Alaska): Now I have a dataset containing a lot of data ...
1
vote
0answers
16 views

Delaunay Triangulation on labeled data

I have a table with locations and labeled data and I need to apply Delaunay Triangulation on specific labeled rows. For example, I have some locations labeled as schools, hostels, gardens, ... and I ...
1
vote
0answers
41 views

Slow performance clipping raster with GDAL

I have a few large LiDAR DEMs that I want to merge. Each DEM has some glitches around the borders which need to be removed in order to get a seamless final product. I manually traced around each DEM ...
2
votes
1answer
37 views

QGIS Join table with shp file. Get Null Values on the join fields

If my problem is that my ID types are not the same, I need help in addressing that. I started with an excel file, I read that on a mac to I need to save that as a Windows comma Separated file. I ...
-3
votes
0answers
44 views

I have opened a file in QGIS from OS data and want to change the colour of some tiles

When I download OS data, onto QGIS desktop 2.14.0, some of the tiles are black and are too highlighted, I want to change this colour, when I righthand click the tiles and go onto the layer button, the ...