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

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2
votes
1answer
96 views

Why can't I open .asc files in QGIS?

Further to my earlier question, I have .nc and .asc files of crop area and production for maize, rice and wheat. It says here, about QGIS importing .asc files: QGIS has native support for this ...
2
votes
0answers
33 views

How to install QGIS with ECW support on Mac?

I bought a imac recently and I tried to install qgis: without success! It is not possible to read the raster files. I installed GDAL ECW plugin, but it is necessary to copy and paste another file ...
0
votes
0answers
17 views

proj.4 definition for (obsolete) UK War Office “Italy South” grid

I'm helping a friend convert his late father's war diary coordinates to WGS84. I have a proj.4 definition that appears to work in QGIS, but if I transform a scanned map with gdalwarp, it's not even ...
0
votes
0answers
16 views

Qspatialite not loading in QGIS 2.6.1 for Mac

I am running QGIS 2.6.1 on MacOS (Mavricks). I have reinstalled the Qspatialite plugin, and am still encountering the same issue. The plugin will not open. Has anyone seen/over come this issue? Any ...
1
vote
1answer
27 views

Where do I find the legend for netCDF files in QGIS?

I'm using QGIS to make maps of the maize, rice and wheat cultivated area at global level. I found these great netCDF files: http://www.geog.mcgill.ca/landuse/pub/Data/175crops2000/NetCDF/ Here's an ...
0
votes
0answers
52 views

First steps on QGIS (examples)

I have just installed the QGis dev library to use it with qtcreator. I have also download some examples. So I use the .pro file in qtcreator and I compile it. The compilation result send me errors: ...
0
votes
0answers
32 views

Alignment by expression is not working after using “wordwrap” instead of “wrap on character”

I'm using wordwrap in the expression dialog to wrap the field "name" after the 12th character (first line) and the 20th character (second line): wordwrap( wordwrap("name"),12),20) So far so good. ...
5
votes
0answers
65 views

Split polygon by area using ArcGIS for Desktop (or QGIS)?

I'm interested to split a larger, irregular polygon into smaller ones. I know the area of the resulting polygon, and I know that the line I want to split it by should be parallel to one of the sides ...
-3
votes
0answers
27 views

can't install qgis qgis 2.6.1.1+unstable1 by ubuntu software center

When I click install get an error : InstallArchives() failed: Extracting templates from packages: 56% Extracting templates from packages: 100% Extracting templates from packages: 56% Extracting ...
1
vote
0answers
23 views

QGIS SAGA Channel network error: Input layers do not have the same grid extent

I am trying to follow along with this exercise using my own DEM. I have done the first step, creating the catchment area, with no trouble. When I try to run the Channel network algorithm, however, I ...
1
vote
1answer
35 views

QGIS Change file browser/chooser default location

Is there a way to change QGIS file browser default location? Currently it points to bin folder of QGIS installation C:\Program Files (x86)\QGIS Brighton\bin.
2
votes
0answers
13 views

GRASS 6.4.4 vector command in crashes QGIS 2.4 (g.gisenv.exe has stopped working)

I am running Windows 8.1 64 bit, and have QGIS 2.4 and 2.6 installed. When I try to use a GRASS 6.4.4 vector command (specifically v.clean), I receive an error message in an endless loop, and the only ...
2
votes
1answer
71 views

Getting started with QGIS, but can't find sample data files on my machine

I'm just getting started with QGIS. After installation, the User Manual directs you to load raster and vector data. It says "browse to folder qgis_sample_data/raster/." Well, that folder does not ...
2
votes
1answer
75 views

How to host the results of qgis2leaf on google drive?

I am wondering how to host the results of the plugin qgis2leaf on google drive to create a free hosted webmap? Here is an example: ...
1
vote
1answer
56 views

Adding a Style to QGIS

I've downloaded the VA Geological Survey data set (http://mrdata.usgs.gov/geology/state/state.php?state=VA) that I have already on Google Earth as a kmz. The various formations are color coded. ...
0
votes
1answer
28 views

How can I add a graticule similar to the DeLorme Atlas to a map in QGIS? [duplicate]

I've got a map in NJ State Plane (Feet) projection and want to add a grid to it with lat and long intervals of 1 minute, and 0.1 minute tick marks. I'm trying to do this in the grid tab in the print ...
2
votes
0answers
18 views

In version 2.4 vector layers with labeling switch off caching

I am developing a map display stand alone application using the C++ API. With version 2.6 the caching mechanism is ignored for vector layers with labels. The reason is to avoid conflicting labels. ...
1
vote
1answer
24 views

Repair Corrupted QGIS Map Document

I have a series of QGIS map documents that have all branched out from a common ancestor that are, as of QGIS 2.6 causing quite a few crashes and issues while using print composers or while doing a ...
1
vote
0answers
16 views

Microstation Elements created in QGIS

In my workflow I typically, in Microstation V8 2004 Edition, manually place a shape element around a series of imported coordinates to use as a fence for loading point cloud data in TerraScan. I am ...
0
votes
0answers
22 views

Error installing Photo2Shape QGIS 2.6 for Mac

I am trying to install the Photo2Shape plugin for QGIS on a Mac (10.9 Mavericks) but I am getting the following error: The plugin is broken. Python said: No module named exifread I have installed ...
3
votes
0answers
67 views

Preserve datatypes when using SQLite and QGIS

Following Nathan's SpatiaLite/DBManager solution in this answer, I find that once the layer is loaded from DB Manager into QGIS (2.6.1), any calculated fields are appearing as text values instead of ...
2
votes
1answer
28 views

Relocating & resizing complex shapefile with OpenSource Software

(please excuse my poor english) I do have a polygone shapefile of an archaelogical site with elevation data of 10cm steps and I dont get hands on the raster data as it was collected by the drone. My ...
0
votes
0answers
41 views

How to eliminate sliver polygons with QGIS [duplicate]

I need to remove sliver polygons within a shape, but using QGIS 2.6 generates some failures to the process. I mean the program freezes or shuts down and I don't know why. Maybe there's a bug or it ...
3
votes
1answer
66 views

How to perform tree birthrate and mortality research with GIS [on hold]

I'm using QGIS 2.6 and have 4 layers of polygons. Each of these polygons describes the outline of a tree, based on airborne imagery. My goal is to find the relations between every synchronously ...
2
votes
0answers
17 views

PyQGIS: Using a Simple Coordinate System (Cartesian Space)

Is there a built in non-world coordinate system that represents simple cartesian space? I want to use PyQGIS but have a canvas set with 0,0 origin and infinite planar space in each direction. In ...
2
votes
1answer
40 views

How to calculate area using QgsDistanceArea?

I am trying the following code as given in the QGIS documentation: d = QgsDistanceArea() d.setProjectionsEnabled(True) print "distance in meters: ", d.measureLine(QgsPoint(10,10),QgsPoint(11,11)) ...
0
votes
1answer
46 views

Delete duplicate geometry in postgis tables

After - I dont know what happend - all my entry's in my postgis tables are doubled! I tryed that to delete them but it does not delete any/all duplicates: DELETE FROM planet_osm_point WHERE ...
1
vote
0answers
43 views

QGIS Topology checker wrong results?

I am trying to understand topology checker results and frankly i dont get it - probably i am doing something wrong. Source - Point layer Target - Polygon layer Must be inside - that is working as ...
1
vote
0answers
22 views

How to delete lines that do not overlap a polygon? [duplicate]

I'am new to QGIS and I run into a problem. I have two shapefiles, one with line data and one with polygon data. I would like to remove all the lines that do not overlap the polygon. So remove all ...
3
votes
2answers
66 views

How to combine two string replace functions in one expression?

I would like to change some of my street labels like "Musterstraße" into "Musterstr." or "Muster Straße" into "Muster Str." I already did that for the first case: replace("name", 'straße', 'str.') ...
2
votes
0answers
34 views

How to split a polygon into quadrants in R/Qgis?

I am solving the same problem as How to split a polygon into quadrants?, except that I am looking for a solution in R or QGis. So I have a polygon layer shapefile, which is unfortunatelly not exactly ...
1
vote
0answers
32 views

How to develop c++ standalone QGIS C++ Application

I want to integrate QGIS in QT\C++ application. I try to write basic C++ apllication to render map and build it using MSVC 2010. class PostGisViewer: public QMainWindow { public: PostGisViewer(): ...
2
votes
1answer
34 views

Is there a python version of qTuio? [closed]

Is there a python version of qTuio? qTuio is implemented in C++. However, I am currently trying to use pyqgis due to problems with C++ environment (I cannot even create a raster layer). Any help is ...
1
vote
1answer
34 views

QGIS Calculate distance between polygon vertices / find vertices that are within distance

I have polygon layer and i need to find (select, so i can export selected to new layer) all the vertices that are in provided distance to each other (like 2 meters). I already tried: 1. Export ...
1
vote
1answer
32 views

QGIS how to align existing polygon borders

I'm looking for a method to align the borders of two overlapping and already existing polygon layers. I'm aware of the node tool and its tolerance snapping option, but the area I'm working with is too ...
1
vote
0answers
14 views

Importing Data Dictionary (DDF) into QGIS (Fields)

Are there any tips/tricks on getting all the Attributes from a data dictionary for a GPS unit to sync with the Fields in a QGIS style? Right now, in order to update the drop-down options in QGIS, I ...
1
vote
0answers
22 views

Interpolation plugin from PyGIS? [duplicate]

How to run this plugin from PyQGIS?? http://docs.qgis.org/2.2/en/docs/user_manual/plugins/plugins_interpolation.html
1
vote
0answers
53 views

Lable size changes when exporting or printing

This is my first question here, I have already learned a lot from the other questions. I am using QGIS2.4.0 on a windows computer When I export a map containing OSM landscape, the labels in the ...
2
votes
1answer
50 views

How to use a csv file to add values to a value map?

I'm trying to populate a value map in the edit widget with some values from a csv file. Could anyone let me know what format the csv file has to be in? At the moment I have just a list of ...
3
votes
2answers
35 views

Points in Polygon Query but having CRS issues (QGIS)

I have two files: A csv file that has lat longs listed for points. A shapefile that contains England NHS CCG boundaries (which usually uses the British National Grid). When I 'add a delimited ...
10
votes
3answers
248 views

From polygon to continuous measure of diversity?

First of all; I have tried to find a similar question, without success. Maybe it's because I'm quite new to GIS and I don't really know what exactly I'm looking for. If someone points me to a similar ...
2
votes
1answer
71 views

How to print 2 maps in the same PDF page using PyQGIS?

I am trying to generate a one-page PDF document containing the following items: 1) On the left half, a full state map (say, New York State). 2) On the top right quadrant, a map that zooms in to one ...
1
vote
2answers
31 views

How to specify a map units line wider than 100000 units

Sorry if this is a very beginner question, but I can't seem to find an answer online by searching. Is there a way to increase the size of the "map units"? I'm trying to draw lines attached to my ...
1
vote
2answers
47 views

Getting attribute data from one dataset to another

In the image below you can see two shapefiles: NYC building footprints (outlined), and underneath a PLUTO shapefile rendered with a categorized blue gradient using the "Floor Number" column. The ...
0
votes
1answer
31 views

Can I fix scale qgis's canvas?

I need to fixed scale in canvas in qgis but I didn't find this function. If I fix scale it is impossible to make zoom in or zoom out into canvas. Only one move which layers loaded can be do are ...
1
vote
0answers
20 views

Columns decimalLatitude and decimalLongitud not recognized while creating a layer from a csv file in QGIS

I'm using QGIS 2.0.1 Dufour to create a layer from a csv file. When I try to define the geometry and assign the x y coordinates sources, I'd expect QGIS to recognize the decimalLongitud and ...
0
votes
0answers
16 views

Raster import problem

I have raster images (orthos) and feature layers in a GIS program (Global Mapper). When I import these files with the same CRS into QGIS they are literally 9000 miles apart and I cannot figure out ...
1
vote
0answers
14 views

How to update the items of qCombox in custom form?

For my project I use a custom form with multiple value relation comboboxes. This works quite fine and I can access the widgets via my script. Init the two comboboxes which are correctly filled ...
1
vote
1answer
18 views

Displaying WMS Attribute Data in Lizmap

I have successfully built a Web server using ubuntu 14.04, Qgis 2.6, with the plug-in lizmap as a local server. I have several polygons being displayed and some WMS raster's from NOAA's WMS. I know ...
2
votes
1answer
57 views

Reprojecting between NAD27 and WGS 84 part III

I am trying to perform a reprojection for data with datum Nad27 to WGS84 datum. According to AndreJ in some previous questions in Stackexchange (CRS reprojection for instance) QGIS uses internally by ...