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

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232 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 ...
2
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0answers
244 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
609 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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2answers
586 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
290 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
71 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
96 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
80 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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0answers
237 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
107 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
263 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
476 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
163 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
533 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
1k 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
289 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
182 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 (optimal/...
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0answers
41 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 ...
2
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0answers
1k 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
2k 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 ...
3
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0answers
4k 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
62 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
974 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 ...
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0answers
2k 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
488 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
165 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
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1answer
293 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 ...
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1answer
427 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: ...
3
votes
1answer
380 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
197 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 ...
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0answers
62 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?
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1answer
749 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 ...
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2answers
52 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 red,...
1
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2answers
492 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
139 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
943 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
342 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 ...
2
votes
1answer
1k views

Finding the common borders between polygons in the same shapefile

The question is essentially the same as here, except that I want to do it in qgis. Thus, is there a qgis function equivalent to the ArcMap intersect function that will take a polygon layer and output ...
0
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0answers
105 views

Long Time for conversion raster file to vector in QGIS

I'm a new user of QGIS, and I'm tring to convert a .tif file in a vector. To do that I have used the "Raster conversion" option, but it's taking long time. I'm waiting for the conversion since 20 ...
1
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1answer
438 views

syntax error when using gdal in python console QGIS

When I run the following code in the python console in QGIS I get a syntax error: import osgeo.gdal gdal_rasterize [-b 1] [-burn 255] [-a Pixelkost] [-te 170000.2 168000.27 177999.8 177999.8] <...
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1answer
112 views

Generating buffers in a automate way

I would like to creat buffers in a automate form and no matter the way (e.g. script, batches and etc) I am asking if anybody here knows how to do it or if are there scripts ready to do it. My ...
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1answer
306 views

Does QGIS Recognize Annotation Feature Classes from File Geodatabase?

My work has recently set up QGIS to access an Esri file geodatabase on a shared drive for my co-workers. I have not used QGIS much, but I have encountered an issue where the annotation feature ...
3
votes
1answer
296 views

How to bring feature selection into Printing Composer?

I'd like to make maps of Finland's municipalities. Our National Land Survey provides data I can make into a Shapefile, and when a municipality is selected in QGIS/Identify Features, three different ...
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2answers
101 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
77 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
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1answer
270 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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0answers
120 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 ...
8
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1answer
476 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
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1answer
119 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 ...