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

learn more… | top users | synonyms (1)

1
vote
1answer
55 views

Why is “Add feature” of the GPS Information tool inactive for some of my PostGIS layers?

Sorry If I rise it again on this forum but I couldn't find any info on limitations/requirements of "GPS Information" tool for QGIS (2.2.0) against data layers. For some layers I'm able to collect ...
0
votes
0answers
61 views

Is it possible to use custom (non-circle) buffer shapes?

I have a shapefile containing points. I'd like to replace each point by the same shape, centered around the point, like the "Buffer" tool with shapes other than circles. How can I do that?
2
votes
1answer
66 views

Where do I find additional instructions for QGIS print composer?

QGIS Print Composer has numerous complex interacting features. Scale vs paper size vs map extent vs QGIS main window map extent - locked layers - resolution - map rendering level (i.e. the scale used ...
2
votes
1answer
330 views

Can I draw free hand figures in QGIS?

I would like to add free hand drawings to my map. I tried the "Rectangles Ovals Digitizing" plugin but am looking for a free hand (not rectangle or circle) tool. Also is there a plugin similar to the ...
1
vote
0answers
110 views

Merging shapefiles to one, rearrange columns?

I am trying to merge two shapefiles which both contain polygons representing properties in QGIS 2.2. One problem is that the names of some of the columns in the attribute table differ between the two ...
1
vote
0answers
51 views

Running algorithm from Processing takes much much longer time than doing it from Qgis GUI

I have a road layer with 32000 features, and I want to find all the intersections. when I use processing->SAGA -> convert polygon/line vertices to points, it is all done in less than 5 seconds. ...
0
votes
1answer
89 views

Geocode several addresses in QGIS

I am using QGIS and I have an Excel file that has fields with direction and it fails to geocode these addresses. Examples: address apartment township 1 calle 2 avenida ...
2
votes
0answers
327 views

No tables listed in connection to MSSQL 2012 in QGIS

I've (finally) made a connection to my MSSQL 2012 database, but no tables are listed. Here's the tree view of the connection, and the connection properties: Some notes and questions: I've read ...
3
votes
2answers
211 views

Combining MS Office with GIS

I would like to incorporate MS Office into my GIS program. I have been using QGIS and was wondering if this would be possible? I am trying to create a one stop shop for my staff to be able to ...
2
votes
1answer
275 views

How to get the map canvas CRS in EPSG code?

This is probably a simple request but I cannot find a way around it: how can I read from python the map canvas CRS? I know how to set it up: canvas = self.iface.mapCanvas() ...
0
votes
1answer
56 views

How do add attributes from shapefile to list of lat/long-coordinates using QGIS?

In QGIS I have a csv-file which contains lat/long-coordinates and population data for each coordinate. I also have a shapefile containing certain regional districts, in my case US counties. Now I ...
0
votes
1answer
71 views

Conditional formatting of grid cells based on specifict attribute

I'm using QGIS. I have a 29x30km grid. Every cell of the grid has its ID and every cell of the grid has an attribute "Population" ranged from 0 to 30000. What I would like to do, is to get some kind ...
2
votes
2answers
245 views

Auto fill second column with predefined names depending on first column (QGIS)

I want to create a point layer. In the attribute table I want to have two columns. In the first column I want to type an abbreviation like A. Then I want the second column to be auto filled with ...
1
vote
1answer
105 views

How to open most recent directory using PyQGIS?

For example, when I add a vector layer, next time that I want to add another layer it opens up where I chose my last layer from. How would one implement this in Python and/or PyQgis? I'm writing a ...
0
votes
1answer
148 views

Changing $id in a shapefile in QGIS

I need to change the id (feature.id() in the python API or $id in the field calculator) of for features in shapefile layers in qgis, and I need to do it in Python. Is there a way? I tried something ...
0
votes
1answer
104 views

Georeferencing PNG against Google maps with openlayers plugin

I am trying to georeference blueprints to the footprint of a building. I'm using the Google Satellite image from the plugin to do this. The blueprints are rotated about 30 degrees. When I run the ...
1
vote
2answers
587 views

ToolBar icon images missing

very early build ~ zip file I am getting blank outputs for button images in a custom toolbar. Although the button information populates the dockable toolbar, they lack respective icons [see Fig.1] ...
1
vote
1answer
242 views

QGIS Model Builder Script - Possible to merge layers in a folder?

I would like the user to select a folder via the interface in which all the vector shapefiles inside that folder would be merged. I have been using the Model Builder and looking at example scripts ...
0
votes
1answer
149 views

What is the best way to manage geodata with open source software?

We are a small group of GIS users with different expertises embedded in an administrative infrastructure attempting to switch to a small and low cost open source infrastructure (open source GDI). ...
1
vote
1answer
341 views

QGIS 2.2 Print Composer does not display map with some datasets

I can't seem to get the Print Composer of QGIS 2.2 to work. When I click on "Add new map", the map square is created, but I can't seem to see my data in it, whatever the scale I use or even clicking ...
3
votes
1answer
161 views

QGIS - Is it possible to increase Output Field Name?

When creating a new Column, the default value for the length of the name is 10. Using the Field Calculator via the Model Builder, I want to include the names of regional areas into the columns which ...
0
votes
0answers
75 views

v.buffer angular buffer doesn't take all the polygons into account

I am trying to create an angular buffer around building footprints with the v.buffer command (QGIS 2.2). There is no error message, but the algorithm doesn't take into account all the buildings. This ...
2
votes
1answer
167 views

How to change attributes with QGIS python?

I have this piece of code which I would like to use for inserting values into column. It does not throw an error, the changes are not written to the source (shapefile). from qgis.utils import iface ...
2
votes
0answers
102 views

Command Line alternative to using QGIS GUI to save a Raster as a Rendered Image

I have a raster image in PNG format which I can open in QGIS but not in Windows Picture Viewer. To do that i figured out that I have to save my raster as a 'Rendered Image' from the 'Save As' (option ...
1
vote
0answers
42 views

Using GeoBrain WCS4DEM in QGIS?

I added the GeoBrain WCS server to the server list: http://geobrain.laits.gmu.edu/cgi-bin/gbwcs-dem?version=1.0.0& I connect to the server and get a list of layers. I select the first one listed ...
1
vote
1answer
69 views

QGIS Road graph setting not configure

I am using qgis valmiera on windows 7 pro 64 bit. I am unable to configure road graph setting. Layer feature Transport layer is not highlighted. Please tell me how to solve this problem. Please tell ...
1
vote
2answers
300 views

Rasterizing polyline data with QGIS/GDAL: custom line width

I need to make a raster from a polyline shapefile. However, when I use gdal_rasterize (either directly or through QGIS), all my lines are drawn one pixel wide, while I need them to be drawn with the ...
0
votes
0answers
210 views

QGis, how to overlay and correctly position and scale a KML and image onto a Google base map

Being totally new to the entire GIS subject I managed to install and get runnning QGis (2.2.0 on Mac) properly, get my Google Maps showing (I set the the CRS to WPSG:3857) and I also got my KML file ...
1
vote
0answers
75 views

QGIS how to patch a plugin on local machine

I want to make a minor modification to a plugin (to change a field width in Table Manager). I edited the .py file and the .ui file and changed what I think are the right numbers but this seems to ...
1
vote
1answer
73 views

how to add data from a layer to postgis table with different field names

I am importing waypoints from GPS (in gpx format) using Layer>Add Vector layer and then I want to clean up the data and add some more attributes and finally add them to a master table in PostGIS. The ...
3
votes
2answers
161 views

Add rectangle polygon

I have a polygon shapefile layer. I want to add a rectangle polygon (just like in Arcmap), and another one using the previous polygon edge. I need it to be accurate, my hands do not meet this ...
0
votes
1answer
914 views

Problem with matplotlib when installing QGIS on mac

I have matplotlib installed on a Mac (Mavericks) via pip, which means the matplotlib files get installed under /System/Library/... I tried installing the most recent version of QGIS, and the install ...
1
vote
1answer
461 views

What exactly is the min/max of an extent? (QGIS heatmap plugin)

I'm having a hard time making the heatmap plugin do precisely what I want (namely, to make a heatmap showing not only points but an attribute of those points), and now I'm thinking that I may be ...
1
vote
0answers
35 views

QGIS integrated browser panel does not show qgs files

I have a problem with my QGIS: it does not start if I double click on a qgs file. I wanted to contour this problem using the browser panel integrated to QGIS, but I can not see the qgs files from it. ...
1
vote
2answers
135 views

Create buffer in Metres

I want to create a buffer in meters around points in Europe. But I cannot find a proper CRS for Europe that is in meters instead of degrees?
0
votes
0answers
46 views

Error opening Google layer in QGIS

I'm using QGIS to open my postgis layers based on Google Maps. But with some I am not having success, an error that generates a dump in the temp folder of my Windows user file occurs. To investigate ...
0
votes
2answers
40 views

Consuming gml generated by sql server As.GML()

Sql server has a method As.GML to produce GML file from geography/geometric type. Is there a good example to utilize this GML on other mapping platform such as QGIS? I have ask a related question ...
1
vote
2answers
187 views

Qgis 2.2 error plugin manager/installer error

I get this error at startup Ocurrió un error durante la ejecución del siguiente código: import pyplugin_installer Traceback (most recent call last): File "", line 1, in File ...
1
vote
0answers
145 views

QGIS distance measure

using QGIS 2.2 and trying to figure out a way to obtain a distance measure for the width of pavement. I have 2 shapefiles: one of points which are at 5m intervals along the pavement centreline and ...
1
vote
0answers
85 views

Validate a gml file

I receive a gml-like response from a RESTful Web service. It looks good for me but I can not imported in QGIS. Is there an online validation tool for a valid gml file? Or am I missing something for ...
0
votes
2answers
425 views

Adding Oracle Spatial View as Layer in QGIS?

Is it possible to add an Oracle Spatial View on QGIS MAP? My view is registered on MDSYS metadata but, when I connect with Oracle DB, it is disabled on the list. QGIS Desktop 2.2.0 Oracle Database ...
2
votes
1answer
192 views

How to recover deleted data from an edited point layer?

As a newbie in GIS, I didn't fail to make a newbie mistake. While editing a point layer I accidentaly deleted all the introduced data. I duplicated a layer, as it was more convenient (same style and ...
1
vote
2answers
135 views

how to start qgis with --configpath option on windows

how can I start QGIS on Windows 7 with the --configpath option? I'm used to work with Linux where this procedure is very very simple (just write in a terminal qgis --configpath) with all the options. ...
0
votes
1answer
43 views

Saving Interpolation data in a shapefile as an alternate to Raster Output

Is there a possibility that we store our interpolation data in a shapefile instead of a raster image, so that the shapefile can be used to display the Interpolation as a replacement to the RASTER ...
1
vote
1answer
77 views

List the projection & datum of all the files in a folder

In QGIS/GRASS, is it possible to list the projection details of all the shp,tab,dxf files in a folder ? We are having 100 - 150 files in too many folders. We would like to create a table of Proj ...
0
votes
1answer
69 views

Lining up .asc XY points with DXF using QGIS 2.0

I've exported XY points (nodes of a polyline with attributes) (.asc) from Star APIC and attempted to import it into QGIS as a delimited text file. I cannot however get it to line up correctly with the ...
0
votes
0answers
172 views

Finding shortest cumulative route (i.e. best 'hub') between networked points

How do I find the shortest cumulative route (i.e. best 'hub') between networked points? I have a dataset where some but not all of the points in the network connect to each other, however it is ...
2
votes
3answers
1k views

QGIS 2.2 Openlayers Plugin shift between shapefile and base layer for large format [duplicate]

I am attempting to create a 24x36 map of New York City, and overlay it with a shapefile from City Planning. I'm using the Openlayers plugin, and I've tried all of the different types of base street ...
0
votes
1answer
79 views

problem transforming pgr route to a line - unexpected extra lines from St_MakeLine

I have created a line geometry from a pgr_dijkstra querry and I am getting an unexpected looking line in qgis. The following image illustrates the problem: The magenta line is the line created ...
3
votes
2answers
193 views

Use Mapnik tiles in QGIS

I want to use the QGIS Map Composer with Python to automatically generate maps. As a base map of these maps I want to use tiles generated with Mapnik. Currently I am serving the tiles with mod_tile ...