It might not be that bad, Paul, depending on the latitude of the start and end points, which - USA <-> France - sounds like they might be pretty close. If it was say Seattle Paris, that would be ok.
Paul Ramsey wrote: > that's really not a good option. mercator does not preserve > length/distance, so the buffer would end up larger at one end than the > other, and furthermore would not be the expected width, since it would > be built far from the latitude of true scale. > > P. > > On Wed, Feb 11, 2009 at 8:52 AM, Pavel Iacovlev > <[email protected]> wrote: > >> As an option you can use google mercator projection for the whole world. But >> read carefully docs about it to understand the precision loss. >> >> http://genuchten.blogspot.com/2008/04/srid-stuff-in-postgis.html would be a >> good start. >> >> On Wed, Feb 11, 2009 at 6:26 PM, Matthes Rieke <[email protected]> >> wrote: >> >>> Hi all, >>> >>> I am currently running into this problem: I have a LineString in lat/long >>> coordinates (SRID 4326 - going from USA to france). I now want to create a >>> buffer in meters from this. So the normal way to transfrom the coordinates >>> to a planar CRS, buffering, then transforming back to 4326 does not work >>> (the Line is covering many UTM zones). What would be a reasonable solution >>> for this problem? >>> >>> Thanks and regards, >>> Matthes >>> >>> _______________________________________________ >>> postgis-users mailing list >>> [email protected] >>> http://postgis.refractions.net/mailman/listinfo/postgis-users >>> >>> >> >> -- >> http://iap.md, The future is open >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://postgis.refractions.net/mailman/listinfo/postgis-users >> >> >> > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- Regards, Chris Hermansen mailto:[email protected] tel+1.604.714.2878 · fax+1.604.733.0631 · mob+1.778.232.0644 Timberline Natural Resource Group · http://www.timberline.ca 401 · 958 West 8th Avenue · Vancouver BC · Canada · V5Z 1E5 _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
