[Qgis-user] Incorrect Results in Buffer [SOLVED]

[Frederick Löbig]

Problem solved: I had to export the line-layer to the Britih national grid projection. For some reason the buffering in EPSG:900913 is way off target...
Now it works just fine.
Best,Freddy


Frederick Löbig
Röderichstraße 59
60489 Frankfurt am Main
---
E:: Frederick.Loebig at grunsnid.de
P: +49 (0) 69 - 78 99 52 41
M: +49 (0) 174 - 70 89 296
---
Office:
euNetworks GmbH
Ludwig-Landmann-Straße 40560486 Frankfurt am MainP: +49 (0) 69 - 90 554 - 532
E: Frederick.Loebig at eunetworks.com
S: floebig

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From: frederick.loebig at live.de
To: qgis-user at lists.osgeo.org
Date: Fri, 4 Mar 2011 09:03:14 +0100
Subject: [Qgis-user] Incorrect Results in Buffer








Hi there,
I have a problem using the buffer function in qGIS 1.6.0:
The situation: I have my project SRS set to EPSG:900913 (web mercator). As a layer I have a line-layer also with EPSG:900913 as a projection. The project-wide units are meters. I now want to add a 250m buffer around the lines so i click vector->geoprocessing tools->Buffer(s), select my line-layer, type in 250 for 250 meters, check dissolve buffer results ans set a filename. Then the buffer is created, but unfortunately, when I export the buffer as kml and check the buffer width in Google Earth it is around 150-160 meters, so far off my 250meters. I also checked the distance with the qGIS measurement-tool - same result. 
The lines are located in London. I have tried to use simple WGS84 and the british nationale grind, but none of them worked.
This has to do something with differente base-ellipsoids I think, but I did not get to the bottom of the problem. 
Could anybody please help me with this?

Frederick Löbig
Röderichstraße 59
60489 Frankfurt am Main
---
E:: Frederick.Loebig at grunsnid.de
P: +49 (0) 69 - 78 99 52 41
M: +49 (0) 174 - 70 89 296
---
Office:
euNetworks GmbH
Ludwig-Landmann-Straße 40560486 Frankfurt am MainP: +49 (0) 69 - 90 554 - 532
E: Frederick.Loebig at eunetworks.com
S: floebig

This email and any attachments may contain confidential and/or legally privileged information. If you are not the intended recipient, please delete the email without reading it and notify the sender.

 		 	   		  

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