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

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0
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3answers
790 views

Subtracting polygon from another in same layer using QGIS?

I need to subtract a polygon from another bigger one, in the same layer. How can I do this?
1
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0answers
34 views

Translate old QGIS (2.2) Sextante model to newer version

Hey there (I guess Victor :-)) I really like the processing toolbox and have realized several models. I also developed some bigger models in QGIS 2.2 / with the former processing toolbox. Since the ...
2
votes
2answers
237 views

Projecting shapefile with unknown CRS to WGS84 using QGIS?

I've tried setting QGIS to on the fly, changing the layer settings, nothing. I'm at a lost cause. Although I am not a GIS professional. http://www.ecaidata.org/dataset/spanish-and-mexican-land-...
1
vote
2answers
171 views

Getting attribute table from WFS data source

I am attempting to get some WFS 2.0 INSPIRE data from the Finnish meteorological institute into a table format of some kind. Is there any software which can easily grab the attribute data for the WFS ...
1
vote
1answer
166 views

Labeling only line vertices in QGIS?

I want to only put labels on the vertices of the polylines. I can use the data defined features to place a label at specific points, but not at multiple specific points. Is it possible to label only ...
0
votes
1answer
38 views

WMS Server scale problem?

I'm new to the environment QGIS, and my question and problem is when changing a layer coming from http://ide.cime.es/menorca/wms/base_referencia/ I want to load the 1-> 86 layer and at first ...
1
vote
1answer
61 views

Render or display only the boundary of a vector layer containing thousands of polygons

This might be a very basic question but my lack of experience makes it really hard to answer. To have a cleaner map to print I want to display only the boundary of a layer composed of more than ...
8
votes
1answer
375 views

Connecting Problem: ODBC versus ESRI Personal Geodatabase (*.mdb)

I try over 2 days to connect an ESRI Personal Geodatabase with QGIS 2.8.1 Here is my testing report. Testing environment: Windows 7 64-bit; MS Office 32-bit; QGIS 32-Bit 1. Step: Creating an ODBC-...
1
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0answers
53 views

C++ QGIS Conditional Label Colouring

I am using QGIS and C++. When I create a layer of polygons with labels in the center I am able to use a RuleBasedRenderer to control the background colour of the polygon. How do I similarly control ...
2
votes
0answers
59 views

Calculating area with Europe Albers Equal Area in QGIS [closed]

I am trying to calculate the area for a number of polygons in EPSG:102013, having changed it from EPSG:3857. When using the field calculator $area, the entire column was returned as nan. Has the ...
1
vote
1answer
168 views

QGIS - some edit feature options disabled in vector layer [closed]

I created a new vector layer in QGIS, saving as I went along and then I saved the project and logged out. When I went back into the project, I wanted to add some more features to the same layer, so ...
1
vote
1answer
90 views

QGIS WGS84 issues

I potentially have a problem with my QGIS project, where I am attempting to digitise a relatively small map, and part of the project requires a calculation of the area of each of the parcels of land ...
1
vote
0answers
68 views

QGIS interface very slow on OSX

I'm running QGIS version 2.8.1-Wien QGIS code revision Compiled against Qt 4.8.6 Running against Qt 4.8.6 Compiled against GDAL/OGR 1.11.2 Running against GDAL/OGR 1.11.2 Compiled against ...
2
votes
1answer
309 views

How to create a plugin GUI for QGIS 2.8.2?

I create a pluging with the pluging builder in Qgis 2.8.2. I went to the folder of my pluging : C:\OSGeo4W64\apps\qgis\python\plugins\yu in order to visualize al the files that the pluging builder ...
1
vote
1answer
440 views

How to calculate raster statistics for each band in qgis

i need to calculate raster statistics for RGBN (4 channels, multiband image) rasters in QGIS. In Arcgis if you use "calculate statistics" in Arcatalog, statistics are calculated for every image band. ...
2
votes
1answer
312 views

Import georeferenced dwg-files to SketchUP

I have a georeferenced dwg-file in a national projection and want to import it into SketchUp pro 2015 without loosing the georeference. My workflow so far was to import it into QGIS, check it's ...
1
vote
1answer
81 views

How to delete char in table attribute in QGIS 2.6.1

I need to label many items but in the table attribute field there are some char (#F) for every item that I have to delete. The length of the description are not always the same. I create a new field ...
1
vote
0answers
216 views

Installing Orfeo toolbox for QGIS?

I installed QGIS through OSGeo4W 64 bit version in Windows 8. QGIS installed correctly, but I cannot add the Orfeo Toolbox. Any suggestions?
1
vote
1answer
91 views

How to extract and save polygons by attribute in QGIS?

I have a shapefile layer from a vegetation mapping project with 417 polygons that represent 21 different vegetation classes. These are stored in a single column called 'type'. I want to break the ...
3
votes
0answers
251 views

How to clip a big shapefile from another shapefile's extent

I am working on mangroves in Sundarbans (Bangladesh / India), using Landsat pictures. I need to equalize them in reflectance, before classification, for the evolution of the biomass in this region. I ...
1
vote
2answers
42 views

Pacific NW Projection Issues

The basic issue is that I have shapefiles saved in WGS84/Pseudo Mercator (EPSG: 3857) and some DEM data saved in NAD83/UTM Zone 10N (ESPG: 26910), but can't get them to line up. I'm using QGIS and ...
3
votes
1answer
1k views

Is there a way to export the style, along with a shapefile, to a kml in QGIS?

I see there were plugins in the past that may have done this such as qgis2kml and qgis2google, but they no longer exist.
2
votes
1answer
195 views

Displaying trailing zeros to right of decimal in label using QGIS?

is there a way I can get zeros to show up in my label when they come to the right of a decimal in a number such a s 270.00? I'm trying to display two decimals in all my numerical labels, but QGIS ...
3
votes
1answer
256 views

Add comma to number labels, multiple records in attribute table

A QGIS question: How can I insert commas in 4 digit numbers in an attribute table that has multiple records, with some numbers that are only in the hundreds? It's for an animation so multiple labels ...
1
vote
0answers
71 views

QGIS and QT library- code compilation problem [closed]

So, I am trying to workout an GIS standalone application using QGIS and QT C++ Libraries on linux(ubuntu 15.04). I am following this tutorial: https://github.com/qgis/QGIS-Code-Examples Taking the ...
0
votes
1answer
2k views

Connect to an ESRI Personal Geodatabase (*.mdb)

My environment: Windows 7 Professional: Service Pack 1 64-Bit QGIS: QGIS-Version: 2.8.2-Wien 32-Bit Microsoft Office 2010 Professional: 32-bit I want to connect an ESRI Personal Geodatabase (*.mdb)...
2
votes
3answers
254 views

An Overpass query for OSM ways; both part of a relation and also a specific tag?

How do I construct an Overpass query to find data on Openstreetmap which is both part of a relation and has itself a specific attribute? Specifically: I'm wanting to find sections of cycle route (in ...
0
votes
0answers
31 views

Merge multiple buffers [duplicate]

Is there a possibility to merge multiple buffers into one single buffer? Illustration: I would like the green buffer to be of one single piece.
1
vote
1answer
56 views

Different values after clipping

I have a satellite image from Landsat TM. I want to clip my area so i created a polygon and thru Qgis --> raster clipper I am trying to clip my area of interest. I noticed that the results have ...
0
votes
1answer
52 views

Copying the visual shapes from another layer to the current one, while keeping the current layers' database

There are 2 layers that have similar shapes but small differences. I want to keep the shape of layer 1 while having the data of layer 2, which includes more data and it will be animated using ...
3
votes
2answers
297 views

Expression for placement of label 'offset from point' by azimuth field using QGIS?

I need help making an expression for labelling points, such that the label is placed in one of the 8 quadrants (above point excluded), based on the azimuth field of the point. For example, if the ...
1
vote
1answer
70 views

show point, based on coordinates, on a map in QGIS [duplicate]

I would like to enter coordinates (e.g. UTM longitude 323519 & UTM latitude 3777727) by hand into QGIS and have it identify that point (either by centering the map on that point or, better yet, by ...
1
vote
0answers
166 views

Importing KML Google Maps files with custom data tables to Qgis 2.4.0

I am trying to visualize the complete attribute table of an exported Google Maps KML file with a customized data table, but QGIS won't parse the added information correctly. This is what I can read ...
4
votes
1answer
212 views

Ignoring certain data values in graduated maps

I'm working and creating a large amount of maps using the latest version of Qgis with vector files and corresponding data sheets. Usually, there will be missing values which is usually easily avoided ...
2
votes
1answer
80 views

QGIS TimeManager with multiple features at one time?

Since the data I have to deal with is really large, it is not practical to separate every feature into one line in the CSV file. Is there any way to animate them as a whole layer? I have ...
0
votes
0answers
19 views

Learning QGIS Resources [duplicate]

I am mainly an ESRI user but want to begin branching out into opensource solutions. I wanted to start looking a QGIS and was interested to know what other resources people were using to learn the ...
0
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0answers
128 views

Equal Area Projection for Indonesia - Standard Parallels

I am trying to do area computation stuff over whole of Indonesia and as such, am using the following projection: http://spatialreference.org/ref/esri/asia-south-albers-equal-area-conic/ To make this ...
1
vote
1answer
125 views

Automatically changing the angle of a symbol in QGIS?

I am working with an iron age cemetery in QGIS. I marked every grave in a point layer with several columns; amongst others, burial rite (inhumation, cremation etc.). I inserted a second column for the ...
1
vote
1answer
126 views

Make diagonal grid in QGIS, divide square into squares

I have square polygon which is aligned under some degree and I want to divide this square to, for example, 25 smaller squares, which must be under the same degree in this square polygon. How this can ...
1
vote
1answer
68 views

What projection to use for many parts of the world

I'm creating a poster which has many separate maps (rivers of the world). I'd like to use a similar projection for each of them, so they're comparable in terms of shape and size. I guess I want some ...
0
votes
1answer
75 views

Where are cpp files from libqgis? [closed]

I am in linux Mint 17.0 I am trying to develop a small application in Qt using libqgis library. When I create a Class inherit from QgsMapCanvas, I get mistakes related with 'undefined references to.....
1
vote
0answers
58 views

Extra white space in ASCII file due to Translate GDAL from QGIS Modeler

Could anyone enlighten me why do I get an extra white space in from of my first column in an ASCII file generated through a model? With ArcGIS it doesn't happen. Output raster type: Int32 Output size:...
2
votes
2answers
454 views

How to run Processing qgis:extractbylocation?

I try to use the processing 'qgis:extractbylocation' in QGIS 2.8.2 from the QGIS algorithm provider. import processing # import the layers by a given uri inputlayer = QgsVectorLayer(uriTr.uri(), "...
1
vote
0answers
18 views

calculating total area of multiple polygons in qgis [duplicate]

I wish to know the total area of all polygons within a shapefile layer. So far I have added a new column to the attribute table that shows me the individual area of the polygons.I tried to copy the ...
1
vote
0answers
71 views

QGIS Convert polygon to point with attributes AND resetting incremental values

Im totally new to QGIS and having trouble with model builder. i am trying to convert polygons to points. Each point must have the attributes of its parent. each point must also have: 1) an ID that ...
1
vote
1answer
331 views

How to split polygon features using an overlaid polygon layer in QGIS?

I have a polygon layer (pictured below) that I made by vectorizing a clip from the USDA Cropland Data Layer. The low resolution of the USDA layer causes fields that are separated by narrow roads to "...
1
vote
1answer
247 views

Setting transparency of layer group with Python in QGIS?

How can I set the transparency for all layers within a group of layers? I assume this will require the use of a FOR loop in the Python Console. Based on How to set the transparency for multiple ...
1
vote
0answers
106 views

Georeferencing reversal of image

I georeferenced a map and it posted to canvas as a mirror image of the original map. I set my project CRS before starting and also made sure to set the same SRS for the Geotiff being created and saved....
0
votes
1answer
88 views

Assigning circle colours to map using QGIS?

I am trying to make a map showing which zip codes are served by which hospitals. There are five hospitals and each can serve one or more zip codes. I'd like to show each zip code with a dots of ...
0
votes
2answers
108 views

QGIS - Edit Surface DEM to Add Buildings

Okay, let me start by saying I'm no expert in QGIS, I'm more into engineering. I'm building a 2D hydraulic model and I would like to add the building footprints (elevated) to my DEM, so flow will go ...