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:: [email protected] 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: [email protected] 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. From: [email protected] To: [email protected] 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:: [email protected] 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: [email protected] 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. _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
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