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

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2answers
318 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
219 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
79 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
79 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
168 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
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1answer
993 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
492 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
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. ...
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2answers
140 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
48 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
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2answers
42 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
190 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
149 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
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0answers
101 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
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2answers
439 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
221 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
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2answers
147 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
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1answer
45 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
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 ...
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1answer
70 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
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0answers
181 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
2k 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
82 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
197 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
228 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
101 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 ...
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1answer
236 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?
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1answer
513 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
122 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
100 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
37 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
513 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
933 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
2k 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
45 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 ...
3
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2answers
413 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?
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1answer
348 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 ...
1
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1answer
96 views

QGIS 2.2 curved labels - 'maximum angle between curved characters' makes label invisible

When labeling a curved line in QGIS 2.2, and setting Placement to 'Curved', the behavior of 'maximum angle between curved characters' is not intuitive, and I haven't been able to find documentation on ...
2
votes
1answer
171 views

QGIS Digitizing in Cartesian

I have a client, that needs some geological maps digitized (polygons) in a Cartesian grid. It would be a basic, square grid with North up, and coordinates in x and y. Some of the maps will need to ...
1
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1answer
309 views

Help defining custom CRS in QGIS 2.2

I'm trying to use EPSG:4479 in QGIS. 1) If I search for EPSG:4479, it returns a "Imported from GDAL" EPSG:4479, but it does not work. At the console, the following message is displayed: ERROR 6: ...
2
votes
1answer
225 views

Accessing CRS info with pyqgis in a standalone application

I'm currently having trouble accessing and defining CRS information in a standalone application. I've read the API documentation and have tried it in the python console in QGIS 2.2.0. The python ...
4
votes
2answers
147 views

Alternative to Spatial Query on large data

I have around 110000 points data spread around the world. the shapefile size is 116 Mb. I want to select points which are inside asia. I have been using qgis but this time qgis is not being able to ...
0
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0answers
53 views

Error SAGA algorithms in Modeller QGIS 2.2

I am using QGIS Modeller and I try to use SAGA algorithms but it doesn't work. GRASS algorithms work just fine but SAGA doesn't. I am not sure if I have to configurate something. What is worng?
1
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1answer
399 views

Problems adding OSM layer

I installed OpenLayers plugin successfully in QGIS 2.2 Valmiera, but when I add OpenStreetMap layer, the following error message appear as a Python error popup window: An error has occurred while ...
1
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2answers
45 views

Set border symbology by bordering feature?

I'm using a US state shapefile, and I want to have different border types based on properties specific to the border, not to any state. For example, I might want the Florida-Georgia border to be ...
0
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2answers
289 views

From RGB raster to grayscale

I have been searching for a way to rasterize shp files (Unexpected output when using gdal_rasterize) and it worked with a little help. Now, my code is first rasterizing the largest sip file and than ...
2
votes
1answer
91 views

How to count the number of data points in each area in QGIS?

I have a shapefile (.shp file) which defines a large number (several thousand) separate areas. I also have an Excel spreadsheet which contains a large number of data points. Each data point consists ...
0
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1answer
379 views

Is it possible to use polygons to create heatmaps?

I hope I can explain my question clearly, so here it goes: I've been fiddling around with heatmaps on QGIS for a few days, but came across a small obstacle on my way. I have a dataset comprised of ...
0
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1answer
211 views

import parameters for r.watershed - (watershed basin analysis program) tool from grass using Qgis 2.2

I want to run this tool from Qgis 2.2 but i don't know how to use the PARAMETERS to run this tool. The red frame are the PARAMETERS I don't know. Can someone to tell me what those PARAMETERS are ...