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

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1answer
136 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
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1answer
102 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 ...
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2answers
503 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] ...
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1answer
234 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
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1answer
141 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). ...
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1answer
325 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
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1answer
157 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 ...
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0answers
72 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
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1answer
148 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
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0answers
99 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 ...
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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 ...
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1answer
67 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 ...
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2answers
279 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 ...
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0answers
195 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 ...
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0answers
73 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
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1answer
65 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
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2answers
151 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 ...
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1answer
824 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
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1answer
427 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 ...
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0answers
34 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. ...
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3answers
120 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?
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0answers
44 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 ...
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2answers
36 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 ...
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2answers
184 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 ...
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0answers
136 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 ...
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0answers
80 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 ...
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2answers
410 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
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1answer
174 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 ...
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2answers
123 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. ...
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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
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1answer
76 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 ...
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1answer
67 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 ...
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165 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
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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
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1answer
76 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
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2answers
185 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 ...
2
votes
1answer
171 views

Part of layer cut/disappears after exporting to pdf in QGIS

This is driving me crazy. The picture says it all: [ http://oi60.tinypic.com/2m5fbd1.jpg ]. You can see whole layer in QGIS browser and Composer, but when i export to pdf some layers are cut. I have ...
1
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1answer
87 views

Calling QgsProjectionSelector from QGIS Python plugin?

I am trying to create a dialog that allows the user to select a coordinate system from either the recently used projections or a general list of all available projections. This would basically offer ...
1
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1answer
207 views

Finding left and right side of line in arcgis

i have road layer as line and polygon layer as building,i want to know left and right side of road in relation with buildings is it possible in Qgis or Arcgis?
1
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1answer
402 views

Creating new lines along specifically selected existing lines using QGIS?

I have tried to find a solution for this everywhere, with no result... My problem is that I want to be able to manually draw a line that automatically snaps to a line (creating an exact copy of the ...
0
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1answer
106 views

Switch line direction for PostGIS-lines in QGIS or Pgadmin

I am trying to switch the line direction in a PostGIS-layer. The postgis-geometry column is e.g. "LINESTRING(0 0, 1 1, 2 1, 2 2)". The reason is that my symbology is direction-dependent, but I drew ...
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0answers
92 views

Determine Transect line to cover area

I'm near certain this is a solved problem, but I haven't been able to find a solution from searches so here's my situation (probably I'm searching the wrong thing)... I need to compute the ...
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0answers
36 views

Using QgsSpatialIndex for spatial join

I've written a bit of code to do a simple spatial join in QGIS 2 and 2.2 (points that lie within a buffer to take attribute of the buffer). However, I'd like to employ a QgsSpatialIndex in order to ...
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0answers
430 views

QVariant is not defined when using addAttributes [closed]

When I try to add a field programmatically with the following code: import os.path from PyQt4 import QtGui, QtCore legend = qgis.utils.iface.legendInterface() allLayers = legend.layers() for i in ...
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2answers
816 views

How to clip a lines vector layer to a polygon layer in QGIS?

I've perused through previous questions and haven't been able to find an appropriate solution to my problem yet, so I wanted to post here. I have a lines layer (a contour map of mean annual ...
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0answers
1k views

Can someone explain to me what the “mini dump” error mean in QGIS?

I am struggling to understand what the error "Crash dumped: mini dump written to C:" means in QGIS. I am working with layers stored on a network drive. Whenever I try to read in a few particular .asc ...
0
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1answer
43 views

qgis2 composer - non-rectangular inset map?

I'd like to have a near-full-page rectangular map object, then add a non-rectangular inset map object with 6 vertices. Any suggestions on how to accomplish this, other than making two actual maps ...
2
votes
2answers
329 views

copy/paste style to multiple layers in qgis 2.2

I have many shapefiles in QGIS. How can I paste the style of one layer to all the other ones? So a "batch" copy and paste solution. If I make a multiple selection the the paste style option is not ...
0
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0answers
1k views

How to access a .mdb file (Microsoft Access) in Qgis (with windows 7)?

I've a very big problem. I need to connect shapes from a polygon layer with a .mdb file (built by Microsoft Access) in Qgis 1.8 (with windows 7), but I can't access it. Can anyone give me some help?
1
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1answer
319 views

Openlayer plugin in QGIS, error in projection 3857 Pseudomercator

I'm using QGIS plugin Openlayer to set the background of Google satellite under my vector layer. However, even if I project my layers as EPSG 3857 (the default and only possible projection for ...