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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...<div><br></div><div>Now it works just fine.</div><div><br></div><div>Best,</div><div>Freddy<br><br><div><br><b><span class="ecxApple-style-span" style="font-family:arial;font-weight:normal;font-size:small"><b>Frederick Löbig</b><br>Röderichstraße 59<br>60489 Frankfurt am Main<br>---<br>E:: <a href="mailto:Frederick.Loebig@grunsnid.de">Frederick.Loebig@grunsnid.de</a><br>P: +49 (0) 69 - 78 99 52 41<br>M: +49 (0) 174 - 70 89 296<br>---<br><b>Office:</b><br><b>euNetworks GmbH</b><br>Ludwig-Landmann-Straße 405<div>60486 Frankfurt am Main</div><div>P: +49 (0) 69 - 90 554 - 532<br>E: <a href="mailto:Frederick.Loebig@eunetworks.com">Frederick.Loebig@eunetworks.com</a><br>S: floebig<br><br>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.</div></span></b></div><div style="z-index:-1;top:0px;left:0px;width:100%;height:294px"></div><br><br><br><br><hr id="stopSpelling">From: frederick.loebig@live.de<br>To: qgis-user@lists.osgeo.org<br>Date: Fri, 4 Mar 2011 09:03:14 +0100<br>Subject: [Qgis-user] Incorrect Results in Buffer<br><br>
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Hi there,<div><br></div><div>I have a problem using the buffer function in qGIS 1.6.0:</div><div><br></div><div>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. </div><div><br></div><div>The lines are located in London. I have tried to use simple WGS84 and the british nationale grind, but none of them worked.</div><div><br></div><div>This has to do something with differente base-ellipsoids I think, but I did not get to the bottom of the problem. </div><div><br></div><div>Could anybody please help me with this?<br><div><br><b><span class="ecxApple-style-span" style="font-family:arial;font-weight:normal;font-size:small"><b>Frederick Löbig</b><br>Röderichstraße 59<br>60489 Frankfurt am Main<br>---<br>E:: <a href="mailto:Frederick.Loebig@grunsnid.de">Frederick.Loebig@grunsnid.de</a><br>P: +49 (0) 69 - 78 99 52 41<br>M: +49 (0) 174 - 70 89 296<br>---<br><b>Office:</b><br><b>euNetworks GmbH</b><br>Ludwig-Landmann-Straße 405<div>60486 Frankfurt am Main</div><div>P: +49 (0) 69 - 90 554 - 532<br>E: <a href="mailto:Frederick.Loebig@eunetworks.com">Frederick.Loebig@eunetworks.com</a><br>S: floebig<br><br>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.</div></span></b></div><div style="z-index:-1;top:0px;left:0px;width:100%;height:294px"></div><br><br></div>
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