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

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2answers
83 views

It is possible to make snap using Google Maps based on QGIS?

Vectorized few lines using QGIS with Google Maps as a base. If I do not Trabachar with maximum zoom does not respect the topology of the base. It is possible to make snap using Google Maps based on ...
1
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3answers
69 views

Colorizing raster in QGIS 2.2 without using OSGeo4W command line?

Total beginner in QGIS. Following this guide right now: https://www.e-education.psu.edu/geog585/node/695 At step 4 I created the simple txt file which I now need to use to colorize the raster ...
1
vote
1answer
126 views

Can not load a WMS services on QGIS

Trying to load the service http://gis.ktimanet.gr/wms/ktbasemap/default.aspx and receives the message Could not understand the response. The wms provider said: Could not get WMS capabilities: error ...
0
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1answer
101 views

hint to create trekking maps with QGIS

I have a lot of different data (rivers, streets, hiking routes, bike routes,etc..) as shapefiles and some raster data (DEM). I want to create a map, that looks like a hiking map (here is an example ...
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0answers
102 views

How to split an oblong, irregular polygon layer into even pieces?

I have a polygon layer (landuse) that I want to split into 100 meter pieces. The polygons show landuse along a road. I want to split the polygons layer so that I can then calculate the percentage of ...
3
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0answers
261 views

How to fix “Raster layer: Provider is not valid” error when loading PostGIS rasters?

I compiled and installed the current QGIS master as usual and I imported some raster data into my postgres 9.3 database with postgis 2.0.2 extension. Whenever I try to import the raster data into qgis ...
1
vote
1answer
88 views

How to identify and highlight invalid geometries?

I'm am trying to clean/edit shape files that were created by algorithm in Qgis. My problem is when I try to split some polygons,they have invalid geometry. Is a way to identify these error maybe in a ...
1
vote
1answer
960 views

How to open a shapefile using Python in QGIS?

I have tried to open my shape files with the help of a tutorial (http://spatialgalaxy.net/2012/01/27/qgis-running-scripts-in-the-python-console/) but unfortunately I couldn't open my shapefiles for my ...
1
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0answers
57 views

Map tips Flashing

I am using some very basic html in a point shapefile's layer properties to display a photo. <b> [% "filename" %] <br> <img src= [% "filepath" %] /> <br> It will display ...
2
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0answers
82 views

can't get QgsGraphAnalyzer to work on a standalone script

I want to use QgsGraphAnalyzer.dijkstra in a standalone script. using version 1.8 I am following the guide at: http://www.qgis.org/en/docs/pyqgis_developer_cookbook/network_analysis.html Here is my ...
1
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0answers
203 views

Why does QGIS crash when my PostGIS table has a primary key?

Configuration: PostGIS Library: 2.0.3 GEOS: 3.3.8-CAPI-1.7.8 Proj: Rel. 4.8.0, 6 March 2012 PostgreSQL 9.2.2, compiled by VC++ build 1600, 64 bit, running on Win2012 server 64 bit QGIS 2.2.0 - 32 ...
4
votes
2answers
2k views

How to Polygonize a polyline shapefile in QGIS 2.2?

When I used QGIS 1.8, I was able to transform polyline layers to polygon layers with the Polygonizer plugin. In QGIS 2.2, this function has been subsumed into the Processing toolbox. Unfortunately, ...
1
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2answers
197 views

Most optimal way to create a (spatial) database for big amounts of data?

I am using QGIS, and on my way to set up a huge spatial database (geographical), where most of the data is points without geometry), along with other types of data (like lines in DXF and areas in ...
4
votes
2answers
541 views

Scale and Z factor have no effect on hillshade analysis in QGIS

I used an SRTM DEM to create a hillshade in QGIS 2.2.0. However, the resultant hillshade seems to be vertically exaggerated. Also, changing the settings for scale and z-factor does not have any effect ...
0
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1answer
591 views

Using Google Maps Offline in QGIS

I am working on a QGIS project that involves me using the Google Hybrid Map Plug-in. I am due to spend time travelling over the next few days and won't have an internet connection. I was hoping ...
0
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1answer
180 views

Generating points from chainage and offset

I have a polyline layer and an external csv containing road sign data. The csv has unique ID of the polyline, chainage along each unique segment and an offset. I have access to ArcGIS, MapInfo and ...
1
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0answers
207 views

Error “Unable to open data source” - import .shp into GRASS

I'm new to GRASS and GIS in general, so please forgive my ignorance... I have problem with loading Vector Data (.shp) into GRASS I used the following steps 1.1. and 1.2: ...
2
votes
2answers
168 views

Rendering a map in QgsComposition on Win 7 / 8 in QGIS 2.2.0 with QgsComposerMap gives blank map

I'm writing a plugin for QGIS 2.2.0 which should render a pdf file with a map and some text. The code is working under Linux (current Arch) and Windows XP, but it's not working on Windows 7 or 8. ...
1
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1answer
65 views

Raster data type as input in processing algorithms

Why the processing algorithms run just with input files located in QGIS desktop? Is there any way to work with directories? I am developing a plugin and I am using processing algorithms but the ...
2
votes
1answer
86 views

Valid values of mollweide projection in QGis

i just imported a vectorlayer (without any reference points) to qgis as mollweide projection to save it to longlat. What i am wondering about is a mathematical problem: Not every x,y coordinate on the ...
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0answers
193 views

How to Display a MapGuide WMS in QGIS Valmiera 2.2

I have no idea why my QGIS Valmiera cannot display the aerial photo via the WMS(MapGuide). The QGIS Dufour 2.0.1 & QGIS 1.8 can display the aerial photo without problem. The QGIS Valmiera can ...
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0answers
35 views

Is ther open source tool for calculating Getis-O-ord (ARCGIS) and able to customize in own platform

i would like to know is there any open source tool for calculating Getis-O-ord(ArcGIS)? If so can i customize for own application or can i write my script within that application like qgis.
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2answers
3k views

how to install QGIS 2.2.0 on mac OS 10.6.8?

Does someone know how to install the latest QGIS on a mac os 10.6.8? The dmg package available on http://www.kyngchaos.com/software/qgis does not run on my OS version. I was only able to find a ...
0
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1answer
42 views

QGis 2.2 layer buggy in 2.3 master

Wondering if anyone else can reproduce this kind of problem? I dual boot windows 7 and ubuntu 13.04 with QGis on both. Have updated QGis to latest on both, and created a layer in my project in 2.2 in ...
0
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1answer
98 views

QGIS WCS client with clip parameter

Can be defined bbox parameter in a WCS service? I require trimming the layer coordinate in a box, I'm trying to prove the following WCS, but shows the entire layer globally: ...
2
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0answers
141 views

What might slow Inkscape down when working with QGIS SVG or PDF output?

When I import an SVG or PDF exported from QGIS print composer (2.2.0) into Inkscape 0.48 the vector graphic has large black lines and squares. These change size when I zoom in and out, and the graphic ...
4
votes
1answer
1k views

Is there a QGIS bezier curve tool?

I'm a recent convert to QGIS but have been confused about the lack of support for drawing curved shapefiles, especially when Arc has almost too many. A lot of the work that our consultancy do is based ...
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0answers
84 views

How to do the “display route events” from Arcgis, in Qgis

I'm working with Arcgis 10.1. In Arcgis there is a feature called "display route events" from tables, and I want to do exactly what that features does, but in Qgis. I'm using Qgis 2.0.1. What this ...
2
votes
1answer
87 views

Alternating ESRI scale bars in QGIS

I'm a recent convert to QGIS from arc and think it's amazing, so much more efficient and usable. It also doesn't crash constantly which helps me keep some of my sanity. I was having issues finding ...
0
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1answer
117 views

Creating an OVF file for connecting Oracle and QGIS

I'm trying to create an OGR file that can be opened in QGIS that pulls in vector data from an Oracle Database. I've tried a few combinations of things but can't seem to get anything to work. I've few ...
2
votes
1answer
485 views

query / filter on attribute tables with external tables joined

i tried to do some queries on joiend table fields ... i've got/found some answers concerning version 1.8 - which result in "use select + export to create a combined dataset" so i just did some tests ...
4
votes
1answer
871 views

“Couldn't load PyQGIS” Error running QGIS on Ubuntu 14.04

I have installed QGis on Ubuntu 14.04 from the QGis stable repository; it went fine with no errors reported. But when I launch QGis I get this huge window with the following message: Couldn't load ...
0
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1answer
71 views

Atlas Composer - how to avoid tabledata from other objects?

I have a layer with multiple objects from where I want to list up the tables with a printoutput for each object. Some of the object are close to each other and therefore the tables of the objects ...
1
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0answers
76 views

QGIS python plugin: PyQGIS for spatial join

For a QGIS 2.0 and 2.2 Python plugin, I am trying to update one layer's field attribute with another layer's field attribute based on geometry function QgsGeometry.within(). My first layer is a point ...
1
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0answers
79 views

Method for identifying upstream segments

I need to add to the attribute table of a stream network layer a column that can identify all upstream segments that contribute to the segment (for each segment). My best idea at the moment is to ...
2
votes
1answer
123 views

More presentable style class range values, faster

This is as much feature suggestion as it is question: Is there a better way to generate attractive/presentable style class ranges? Currently I have 5 similar datasets. Lets say the values for the ...
0
votes
1answer
43 views

QGIS “transform error” after downloading from OpenStreetMap

Beginner's question. I am working on this tutorial: http://www.qgis.org/en/docs/training_manual/vector_analysis/basic_analysis.html After selecting WGS84 UTM zone 34S in Project Properties, I receive ...
3
votes
1answer
169 views

Is there an escape option for single quotes & apostrophes in QGIS?

I'm trying to use the Data Defined symbology in QGIS ver 2.2. Some of my data has single quotes/apostrophes. Since the string must use single quotes, is there an escape option I can use for the field ...
1
vote
1answer
80 views

QGIS Analyst Create Finished Product for MapInfo Client

I use Esri in my day job and am learning QGIS for work on the side. I have a Client that uses MapInfo for creating Posters and Presentations. I have never used MapInfo. I am digitizing geology data ...
1
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1answer
67 views

QGIS how to add string field

I have a few point shapefiles. I want to merge them, but first give each point a certain type according to shapefile. How do I add a String field, all with the same word? (changing the field type ...
0
votes
1answer
95 views

Sql to view points of intersection with line not working

I have two tables one called test lines and other points called testepoint with some geometries drawn in QGIS to test my sql. Are as in the image below: I want to select the points that inteceptam ...
0
votes
2answers
80 views

How to define the symbology used in QGIS print composer without using separate styles for screen and print

I use scale-dependent symbols for mapping (rendering Openstreetmap vectors as it happens). For instance paths show up when zoomed closer than 1:50000, but only roads show when zoomed out. The rules ...
1
vote
1answer
137 views

Adding tracks to gps with QGIS feature attributes as name

I am attempting to send a vector layer to a garmin gps in QGIS. I am using the GPS Tools extension and have created a new GPX layer. I can add waypoints without any issues, but when I copy features ...
0
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0answers
69 views

Sort polygons from north to south in QGIS using 'graphical modeler'?

I'm building a model in 'graphical modeler' in QGIS 2.2. I want my model to clip a polygon layer and give the polygons coordinates so that I could sort them geographically from north to south. After ...
1
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0answers
202 views

Creating custom CRS for India toposheets using QGIS?

Indian toposheets (pre-2000 series) of 1:50k scale are in Polyconic projection, with Everest 1956 spheroid and India-nepal datum. How do I create a custom CRS in QGIS to represent this, so that I can ...
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0answers
23 views

Calculating std dev for ruggedness using QGIS?

I have a DEM raster image and a vector layer with 200+ grids. Using QGIS, I got the terrain ruggedness index for the DEM layer. Now, I want the std dev (i.e. variation in ruggedness) for each of the ...
0
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0answers
94 views

Batch join non-spatial csv to shape files

I have 173 point shape files from soil testing and 173 non spatial csv files with lab ressults (one csv for each shape file) that need joining. The files are located in a library with folders named ...
1
vote
1answer
118 views

Is there any issue using R scripts with sextante processing framework?

I want to use R scripts from the module Sextante treatment QGIS , but I have many difficulties to configure the module in Sextante . Following the procedure described in the official documentation of ...
2
votes
1answer
476 views

How do I create a set of equally spaced points along a line using QChainage and export these as latitude and longitude coordinates in degrees?

In QGIS 2.2.0, how do I create a set of equally spaced points along a line using QChainage and export these as latitude and longitude coordinates in degrees? I am using the QChainage function in QGIS, ...
0
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2answers
37 views

How to set symbology based on an attribute of a 1-N table

Now, it is possible to edit geographic features and add elements in child tables using 1-N relationships. I want to construct a stacked - symbology which allows me to represent the multiple ...