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

learn more… | top users | synonyms (1)

2
votes
0answers
34 views

Percentage cover using QGIS?

I need to calculate the percentage of coral cover (polygon layer) in a 1 km radius around each record of fish (point layer). There’re about 4000 points (blue squares in the image). I am new to QGIS so ...
1
vote
0answers
32 views

raster and vector misalignment

my vector and raster datasets align perfectly fine in Arcmap but not in QGIS, any suggestion on solving this dilemma is very much appreciated.
1
vote
1answer
42 views

Remove cell boundaries of raster pixels converted to vector format

I have a solar radiation shapefile with 10 km x 10 km cells. When I put it on QGIS, many pixels with boundaries take place. Please see the following image: How can I remove them in Qgis?
0
votes
0answers
66 views

QGIS - Tabular output for labeling

I'm new to QGIS and am trying to figure out how to output labels under a tabular symbology (I would have liked to post a file showing what I want but can't find a way to submit a file) : So my ...
0
votes
0answers
23 views

QGIS font symbol problem

Where qgis store the fonts. I try to find the directory but i cant. I transfer my symbol to other pc and i realized that have missing fonts and this is the reason that my symbols is wrong
2
votes
2answers
130 views

merging raster aerials in QGIS issue

I follow the instructions here very closely and yet every time QGIS gets caught in a loop. It takes a few small rasters totally less than 100mb and creates HUGE gb files and will not stop until ...
2
votes
2answers
93 views

Calling QGIS from MacOS python

I would like to import qgis.core and utils from my own copy of python. I do have PYQT4 installed there. I'd be happy to add to my PYTHONPATH or sys.path.append in my code, where do the qgis modules ...
0
votes
1answer
57 views

Missing Plugins in QGIS 2.6

Do I need to re-install plugins after upgrading to 2.6? Not all the plugins I had on QGIS 2.4 appear on 2.6.
0
votes
0answers
26 views

Create polygon with predefined size

I need to create a polygon (square) with a predefined size to place it anywhere in a map. The size is given in centimeter (size in cm * scale = size in real). Is that possible with postgis/qgis?
1
vote
0answers
56 views

QGIS 2.6. How to move labels with “easy label engine” tool

In fact I'm looking for an similar tool like "converting label to annotation" as you can find it in ArcGIS. The "easy custom labeling" Tool in QGIS seems to come close to the ArcGIS solution. However, ...
0
votes
1answer
44 views

Can I include polygons that lie across boundaries when using the clip tool?

I am trying to create a map consisting of two vector layers showing a country divided into districts and contaminated areas within the country. However, since I'm only interested in the ...
1
vote
0answers
27 views

Font styles problem

i have problems with Font Styles in qgis. I have created fonts symbols in my system but when i open the same qml in an other pc the fonts is rong. I try to export my symbols in xml but nothing. please ...
0
votes
0answers
26 views

Getting error when consuming WMS (created from ArcGIS Server) from QGIS 2.4

I have created WMS and WFS using ArcGIS Server. I further deploy the authentication towards both services using the users & rolese set by ArcGIS server built in store. For example, user with ...
1
vote
0answers
21 views

QGIS - Select intersecting features within Value Relation Widget

Does anyone know if it is possible to filter records in the Value Relation Widget to include only those that intersect the current feature? We are trying to set up a layer for user input where we ...
1
vote
0answers
42 views

How to apply colour ramp to user-defined range of values for contour lines?

I have contoured elevation data, across a number of shapefiles, at 10m intervals. Each tile has a different range of values (min - max). Under Style > Categorized, I can only apply the colour ramp to ...
0
votes
0answers
39 views

How to manually add texts on the map in QGIS?

Is there another way to put river, towns etc names beside labeling in QGIS? Can you manually type text determine size and place it where and as you wish on the map?
1
vote
0answers
15 views

QGIS Extract elevation data only for one country [duplicate]

Hye, Here a map built with (1) a shape file for country contour, and (2) raster from .hgt files with altitudinal representation. How can I only select the area corresponding to the country ? I found ...
2
votes
1answer
88 views

From CSV file (latitude and longitude fields) to point .shp

How i create a new point shapefile from CSV table? If i have a CSV file with a latitude and longitude fields, is there a method for to have in output a puntal shapefile?
0
votes
0answers
36 views

Old GDAL/OGR version with QGIS from ubuntugis in 14.10?

Installing QGIS 2.6 from ubuntugis installs an old GDAL/OGR (ogrinfo --version GDAL 1.10.1, released 2013/08/26) - it should be 1.11 for support of the Open FileGDB connector in QGIS 2.6 So I don't ...
1
vote
0answers
39 views

Is there a way to create layer summary Pie Charts?

In Qgis2.6. I want to create a pie chart to summarize the layer data. I have a layer of land use polygons (woodland, agricultural, urban etc.). I want a pie chart to show the % of each land use in the ...
0
votes
1answer
74 views

QGIS 2.6 - creating contours from points

I can't find the example model "contours from points" in QGIS 2.6. Is there another tool for creating contours from points, besides the QGIS Contour plugin?
2
votes
2answers
66 views

“Phantom” features showing up in QGIS 2.4

I tried searching for this, but am unsure exactly what my problem is. I am using QGIS 2.4 on Windows 8.1. I have a project in which I have been digitizing from OpenMaps. Last night I was doing some ...
2
votes
2answers
45 views

How can I avoid incomplete wms layers when exporting large maps in qgis 2.6?

I have a QGIS 2.6 project with around 20 vector layers and on wms layer (working on Ubuntu 14.04). WMS rendering works OK, altough a little bit slow, and exporting A4-size maps also works properly ...
0
votes
1answer
42 views

QGIS Print Composer producing angled graticule lines that look like rectangles instead of squares?

I just tried to create an extremely simple map made of one layer loaded as WMS layer from Croatia's geoportal (http://geoportal.dgu.hr/wms). I successfully loaded the necessary layer and created ...
1
vote
1answer
31 views

QGIS graticule coordinates in print composer starting from 0?

I am not sure how to explain the problem correctly as my English isn't as great as it should be - but let me try anyway. I just tried to create an extremely simple map made of one layer loaded as ...
2
votes
1answer
64 views

How can I transfer waypoints and tracks from Base Camp into QGIS2.6?

I'm working on transferring all my field data from Garmin Base Camp onto QGIS. This is an attempt to overcome the learning curve from basic trail GPS mapping programs to the real thing. I'd like to ...
2
votes
2answers
45 views

Why does clipping polygons result in no features?

I'm using QGIS 2.6. I'm trying to clip the polygons in one layer by another but cannot get the results I expect. I have a layer with wetland areas, and another layer with the boundary of my client's ...
0
votes
1answer
61 views

Project from Datum Nad27 to WGS84

This should be simple: have a shapefile in UTM z16 DatumNad27 and want to transform it to Datum WGS84 latlon I am using Qgis 2.6 Sorry I am going to clarify, with the steps taken: 1- XY data of a ...
1
vote
1answer
38 views

How to set the Measure Tool Ellipsoid Default Behavior?

Using QGIS 2.6.0 Brighton, I want to overlay a shapefile (EPSG: 26910, Nad83 UTM10) over OpenLayers Google Satellite (EPSG: 3857, Pseudo Mercator), and reliably measure distances. Furthermore, I want ...
1
vote
3answers
38 views

How to narrow raster features to single cell width?

Are there any tools or existing workflow which convert raster features (such as roads, rivers, electric lines etc.) which are (or can be) multiple cells wide to a single cell widht (i.e, center line). ...
2
votes
0answers
48 views

QGIS Problem with extract and warp modules in model builder

I have problems using the gdal modules extract and warp in the model builder. They run correctly when started without the modelbuilder, but when I integrate them in the modelbuilder they won't work. ...
0
votes
1answer
40 views

Contours with negative values using the model example in QGIS?

I have a data set of water level ranging from -6 m below sea level to +30 meters. But when I use the model example for creating contours from points, the minimum contour value is zero (0). What can be ...
3
votes
1answer
64 views

What's the QGIS Legend Format Syntax to label percentage values?

I asked a question about formatting legend text a while back and I'm happy to see the issue has been solved in QGIS 2.6: How to remove trailing zeros from QGIS Graduated Style Class labels? But I'm ...
1
vote
1answer
44 views

How to calculate the perimeter of the polygon using python programming

Is it possible to calculate the perimeter of each feature of the polygon? For calculating the area we are using: area=feature.geometry().area() is there any function to calculate the ...
4
votes
2answers
510 views

Misplaced Google Maps with OpenLayers plugin in QGIS?

I was using Google Maps with OpenLayers plugin in QGIS with my vector layer with projection EPSG:4326 with google map projection EPSG:3857 and "on the fly" transformation enabled. It was matching ...
0
votes
0answers
37 views

Creating a Raster of Road Distance to Point

I am using QGIS 2.6. This question is in two related parts: I'm trying to create a raster of travel time from one point to another point travelling via the road system. Each raster pixel will roughly ...
0
votes
0answers
14 views

How to draw coordinates QGIS print composer? [duplicate]

I am trying to add coordinates to a map, I fix all of the settings, but they don't show in the map... Do I need to do any previous work?
0
votes
0answers
64 views

QGIS raster symbology problem in 2.6

With the new 2.6 QGIS version I often have problems with raster colors. For some reason certain pixels do not display initially, but if I move the raster a little spatially they show up.
2
votes
2answers
212 views

QGIS 2.6.0 Minidump crash EVERY TIME I SAVE

Just got QGIS 2.6.0 running on Windows 7 service pack 1 64 bit. Project loads, edits, saves editing changes, adds removes, layers no problem. Only problem is saving the project. Do that and it's ...
0
votes
0answers
19 views

Help with Parameters in Qgis Python lidartools:lasclip

I am trying to use the python console to batch quite a few processes from lastools. I'm having trouble with the arguments to lasclip. clipped_las = processing.runalg('lidartools:lasclip', True, ...
0
votes
0answers
12 views

How to create a macro-localization in print composer (QGIS)

Is there a way to do a macro-localization in Qgis 2.6. I am currently working in a map of the Baja peninsula so I need a macro-loc of Mexico or North america...
2
votes
1answer
77 views

QGIS 2.6 Brighton: Problem with zoom

I seem to have a problem with the zooming levels in QGIS 2.6 Brighton. When I go to zoom in to a vector or raster layer, e.g. for digitizing purposes, the scale seems to be fixed at 1:2,256, I can't ...
1
vote
1answer
83 views

How to import multiple shapefiles without any dbf to a postgis database?

I have a polyline shapefile (.shp and .shx) without .dbf. I would like to import the shp into Postgis. In order to do that, I created the corresponding .dbf using the r code provided by mdsumner in ...
2
votes
2answers
68 views

Saving a QGIS project using the API loses mapcanvas (and other) XML nodes

I'm using the following python script to open a QGIS project, modify some things, and save it under a different name: from PyQt4.QtCore import QFileInfo from qgis.core import * def main(): ...
1
vote
1answer
57 views

Creating a mosaic with gdalwarp - How to deal with no data and overlap

I want to create a mosaic of satellite imagery in .tiff format. I want to create an actual mosaic, not a vrt, because afterwards I will cut the image in to tiles that make sense for my users. Gdal ...
1
vote
0answers
33 views

QGIS nearest neighbor parameter description

Could anyone explain me the following parameters, which I get by doing a nearest neighbor statistic on a point shape? I suppose that Observed mean distance is the mean distance between two points ...
2
votes
1answer
21 views

Intersection between polylines feature to polygon in QGIS

I would like to transform a line shapefile into polygons. However, the tool Vector>Geometry>Line to Polygon doesn'to work to me. What I would like to do is using the intersection between lines and ...
3
votes
1answer
29 views

How to get the length of each line segment in a line shape file in QGIS

Iam new to QGIS. I drew a line depicting a small length of road. But I drew it in segments and then atlast right clicked at the end point and gave id=1. I extratced the nodes, their geometry. But what ...
1
vote
1answer
83 views

How to add vertex to an existing polyline programatically?

I have a Polyline and would like to add new vertex to before start point or end point or at any part of the polyline using python in qgis. How can i do that?
1
vote
0answers
11 views

Avoiding intersections with QGIS Spline plugin (Version 2.0)

Has anyone gotten the QGIS 'avoid intersections' option to work when adding polygons via the Spline plugin? When checking the option and enable topological editing, I continue getting overlaps in my ...