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

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2
votes
1answer
159 views

Displaying Grid line on QGIS Print composer?

I am using QGIS 1.8.0 Lisboa. I am making a print composer map that displays the grid lines as reference for the coordinates. But it doesnt display anything (gridlines) on the print composer map. ...
3
votes
0answers
80 views

Automatic generation of equidistant points inside a polygon in QGIS?

I'm trying to find a way to generate a layer of points inside a given polygon of, for instance, 100 m x 600 m. Every points must be distant from the others and from the polygon borders of (e.g.) at ...
1
vote
0answers
57 views

What kind of methods are most commonly used to interpolate a relief?

I have got a topographic plan with height measurements which I converted to point shape file with height value in attributes. I was wondering, what kind of methods are most commonly used to ...
2
votes
1answer
164 views

Why are my DMS points plotted way off from their true locations?

I'm having a bit of a nightmare plotting some GPS coordinates in QGIS. My coordinates came from a PDF so it took a little wrangling to extract the from the PDF and convert them to a CSV file. I've ...
1
vote
1answer
116 views

QGIS attributes pop-up window is empty

I have a problem with QGIS (2.2 and 2.4). Sometimes, when I'm going to insert some new features on a layer, the pop-up window that appears at the end is empty (all gray, no attributes are displayed). ...
2
votes
1answer
501 views

OpenLayers does not appear in the QGIS plugin menu [duplicate]

I have installed the OpenLayers QGIS plugin, which features external map layers in QGIS. Quoting the official page: OpenStreetMap, Google Maps, Bing Maps layers and more In QGIS, it seems that ...
1
vote
2answers
383 views

Where is the OpenLayers Plugin in QGIS 2.4? [duplicate]

I want to do a really simple thing: add OpenLayers/Google Maps basemap as WMS layers. I found this answer: How to add Basemaps from Google or Bing in QGIS? I installed the OpenLayers plugin, ...
2
votes
2answers
341 views

QGIS project to TMS tileset?

I'm trying to turn a QGIS 2.4 project into a TMS tileset. What method have folks used, with what success and what level of effort? The project in question has about 50 layers and uses OTF projection ...
2
votes
1answer
72 views

Joining QGIS extent table with shapefile

I used QGIS to find the extents of a list of features from a census boundaries shapefile. I used Vector - Research tools - Polygon From Layer Extent, which creates a new shapefile with a table of ...
4
votes
2answers
885 views

How to create isochrones from streets with distance values?

I have made isochrone lines using GRASS and QGIS, as shown. The lines show various distances to fire stations on a street network. Now I would like to turn these lines into polygons that look like ...
2
votes
1answer
100 views

ringer: help convert simple plugin to new QGIS 2.x

I have been trying to get this simple plug-in to work on QGIS 2.x. So far i got it to load, but it does nothing! all that it is supposed to do is place a polygon where a hole (ring) is. The code is ...
1
vote
1answer
92 views

Error on 'Extract raster values (CSV)' - Error executing algorithm 1 'Dataset' object has no attribute 'mapToPixel' See log for more details

I would like to extract raster values at some locations (point shapefile) in 'csv' format. I use 'Point Sampling Tool' and it works well for a raster file. However, I have hundred of raster files ...
1
vote
0answers
51 views

how to calculate radius of curves in a polyline with QGIS

I have a polyline made of curves and I would like to know if there is a way in QGIS to calculate the radius of the curves?
1
vote
0answers
50 views

QGIS cannot open layer properties

I'm trying to open (vector) layer properties in QGIS 2.2.0 and 2.4.0 (Windows 8.1) and nothing is happening. The application freezes and not responding at all (requires cntrl+alt+delete to close). I ...
1
vote
0answers
96 views

ERROR 6: EPSG PCS/GCS code error when running QgsGeometryAnalyzer().buffer

I am trying to buffer points from a FileGDB in a PyQGIS script. I setup my environment with the following batch file and run the python script below. The problem is that I get ERROR 6: EPSG ...
2
votes
1answer
46 views

Speeding up processing of geotiff background for QGIS?

Originally I had an image as a mrsid file. That was very convenient as it was smaller and fast to pan etc. The down side was that every time I upgraded QGIS I had to go through the ritual of ...
2
votes
3answers
124 views

Is it possible to know which roads belongs to which districts?

I have two shape files: road layer and a district layer. Is it possible to know which roads belongs to which districts? I'm currently using QGIS.
1
vote
1answer
628 views

QGIS SLD in GeoServer

I rendert a beautiful with QGIS based on OSM data. Now I want to publish it via GeoServer. I am new to GeoServer but as far as I it does not accept SLD files created by QGIS. My GeoServer cannot ...
3
votes
0answers
68 views

Overriding the QGIS Feature Dialog

We are developing a QGIS plugin and would like to override the QGIS Feature Edit Form with our own Dialog. Have explored using setEditForm and setEditFormInit, but the init process appears to want to ...
2
votes
1answer
34 views

Broken Plugin: EOL while scanning string literal [closed]

I've written a python plugin, and it works perfectly on my pc (Windows 7). I've zipped the whole folder and sent it to the client. they report back with this (the name of plugin's folder is LTS): ...
1
vote
1answer
43 views

Convert and export lat longs from text layer - QGIS

I have imported a Text Delimited Layer that was a csv file with three fields id, lat, long. The layer shows up correctly and the values are in Feet. I need to convert the Feet to Decimal Degrees and ...
2
votes
3answers
277 views

Content for Introduction to GIS course using QGIS?

There is already a Q&A here at GIS SE on Where to find QGIS tutorials and web resources? but this is not a duplicate of that because it is about Instructor-led rather than On-line Training. For ...
0
votes
0answers
50 views

Problem with Performance when accessing selected Features from PostGIS layers in QGIS using Python

I have 2 PostGIS layer in my QGIS project. They have about the same amount of data and a similar structure except that layerX has its PK on a single column and layerY has its PK on 4 columns. When I ...
1
vote
0answers
22 views

How to read and write to .txt in layer properties, action tab?

I want to write a certain attribute to a .txt file using the action tab in the layer properties (combined with Hotlink). In the QGIS-2.2-UserGuide, on page 97, there is an example on how to do that ...
2
votes
1answer
146 views

Broken MSSQL provider in recent QGIS versions - has anyone experienced this?

I recently moved from QGIS 2.2 to 2.4.0 and in the process the MSSQL spatial data provider appears to have stopped working properly (behaviour is also the same with 2.5.0). QGIS will still connect ...
-3
votes
1answer
1k views

How to extract drainage line network from GRASS GIS and QGIS [closed]

Giving DEM as input is there any way to get drainage network? I am newbie to GRASS and QGIS ,provide any working examples in GRASS GIS and QGIS with procedure.
1
vote
1answer
505 views

Getting Leaflet and image popup from QGIS export working?

I am a novice in using leaflet, I exported my map layers from QGIS to a working Leaflet map. I am trying to modify the popup to use the attribute so as to get an image popup. i am however stuck as i ...
1
vote
1answer
77 views

Geometry error in roadnetwork

I have a road network table. When I check st_isValid(the_geom)='f', I am getting an error: NOTICE: IllegalArgumentException: point array must contain 0 or >1 elements ERROR: Exception in ...
2
votes
1answer
117 views

QGIS Plugin development version compatibility

At this time latest QGIS version is 2.4 , QT Version is 5.3.1 and PyQT5.Are these version compatible with each other ? Once QGIS 2.4 is installed , how does one know which version of QT and PyQT(and ...
1
vote
1answer
266 views

What are the parameters for my connection QGIS

I am new QGIS, I was wondering what the parameters are for the New MSSQL Connection in the dialog window? Provider/DNS: ? when local ? tried leaving empty Host: ? when local ? tried my ...
1
vote
0answers
228 views

Convert polygon data into extreme lon/lat coordinates using QGIS

I'm very new to QGIS. I have a shape file of census blocks and want to use the data to plot points within each boundary using Google Maps api. I figure the best way to do this is to find the extreme ...
6
votes
3answers
456 views

How to combine raster and attribute table in QGIS?

I have some rasters representing string categorical variables. Each raster contains integers, used to translate the categorical variables. I have also the .csv tables giving the meanings of the ...
4
votes
3answers
405 views

How do I make data points different sizes based on data?

I am trying to plot sales data on a map using QGIS. I will add the disclaimer that I am a rookie at using the program. I added the different sales types by adding delimited text layers (utf16). The ...
0
votes
0answers
205 views

How to correctly render a raster Layer to GTiFF with QGIS python console?

I am trying to render a map from a raster layer. As recommended in pyqgis cookbook and here(osgeo.org) I use QgsMapRenderer(). I am able to produce a picture but it has not appropriate extent and ...
1
vote
1answer
80 views

How to create a photo-documentation in QGIS?

I would like to create a photo-documentation in QGIS for some real world objects. The photos aren't geotagged but I now their position on the map. If possible I would like to link them to a point ...
2
votes
1answer
132 views

Export raster from QGIS 2.4 to PostGIS

How can I export a raster file out of QGIS (version 2.4) into a PostGIS database? I am looking for a module or python script.
1
vote
2answers
118 views

Where/how to find ortophotos

I am very new to Geographic Information Systems. I have a very basic inquery; How do I get hold of the newest ortophoto of South Africa to use as a background map for my GPS data? I'm using QGIS but I ...
1
vote
0answers
177 views

drawing tools for (lines,polygon and points) in QGIS 2.4.0

I want to draw lines, polygon and points without necessarily creating a shapefile in QGIS. Please help
1
vote
1answer
120 views

How to create QGIS theme map?

I need to make theme map using diagrams like in MapInfo, can I do it in QGIS? Or can I create a surface using attributes?
3
votes
2answers
314 views

How to delete empty fields from a Shapefile with QGIS or ogr2ogr?

I have a Shapefile with a lot of empty columns but many of them are empty. Using QGIS or ogr2ogr, how do I remove all attribute columns where everything is NULL?
1
vote
2answers
138 views

cadtool and spline plugins not working

Am trying to edit a line shapefile using a spline tool in QGIS 2.4.0 .Its drawing but the ok button is inactive. what could be the problem? Generally am trying to create a curved line.
2
votes
1answer
108 views

spectral profile for multilayer/time series

I am missing a spectral profile in QGIS which enables me to see the values for all bands of a given pixel. (absolutely necessary for multispectral and multitemporal/time series work) It seems, there ...
2
votes
0answers
49 views

Exporting attribute data from vector data by selecting object in QGIS?

I'm using QGIS (2.4.0), and i need to export the attribute data of the object i select (shapefile) to another file ( Excel, txt,...it is yet to be determined depending on the solution). I know how it ...
4
votes
1answer
373 views

Creating blended colour relief in QGIS?

I am mapping mountainous areas in QGIS 2.4 and would like to recreate the beautiful blended colour relief found, for example, in the map shown at http://maps.kartoza.com/Boosmansbos/. While I am ...
3
votes
3answers
49 views

Is there a way to shift data in an attribute table so that all attributes are moved to a different coordinate?

I have several shapefiles where the attribute table is composed of timestamped data that is appended to the coordinates. Because of the nature of my data, I need to apply a time lag so that the data ...
2
votes
1answer
127 views

Exporting QGIS shp file to dxf-Which dxf format?

As I understand it, dxf comes in a range of format types. QGIS (v2.0 'Dufour') can export any layer to a dxf file. However I have a hydraulic modelling package which relies upon importing the dxf file ...
2
votes
0answers
113 views

Using Space Syntax Analysis plugin for QGIS?

I'm trying to run the Space Syntax Analysis plugin for QGIS. I've added the metadata file that was missing, but it does not appear in the Plugin toolbar when I click on it. Can someone help me to ...
2
votes
0answers
141 views

Changing extent on a raster in QGIS

I rasterized a shape. The resulting raster (lets call it raster 1) has a different extent. I made a virtual raster with the original polygon and I tried to multiply the virtual raster with raster 1 ...
0
votes
0answers
96 views

Merging contour lines generated by gridded data

I have a set of gridded data, which I have used to generate contour lines based on separate values in the data. In the example provided the contour lines shown correlation coefficients. The contours ...
1
vote
2answers
92 views

How to get a contourline shape into ArcGIS or QGIS from an AutoCAD file

My question this time is about a request. I need to create an elevation profile and I know I can do that in QGIS 2.4.0 or ArcGIS 10.2. But first I need elevation data, information that is in AutoCAD ...