If he's just buffering one line, he should calculate it by hand, like a Real Man :)
On Wed, Feb 11, 2009 at 10:22 AM, Chris Hermansen <[email protected]> wrote: > 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 > _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
