On 10.10.2013, at 14:06, Iván Sánchez Ortega <i...@sanchezortega.es> wrote:
> El Jueves, 10 de octubre de 2013 13:16:42 Jaak Laineste escribió:
>> Isn't there really better solution than dual-transformation? [...] Good
>> solution would be to implement buffer function from latitude/longitude
>> directly, say buffer(lat,lon,buffer_meters). Any takers?
>
> Actually, what you want is a buffer(lat, lon, degrees) algorithm that works
> on
> polar coordinates on a topological sphere/geoid (as opposed to cartesian
> coords on a plane).
>
>
> But if PostGIS geography hasn't implemented that, my bet is that no one has.
> Yet.
You can calculate buffer around point quite easily with algorithm like
http://williams.best.vwh.net/avform.htm#LL , but generic buffer implementation,
for lines/polygons would be bigger tasks for sure. Spherical JTS would be nice
:)
Jaak
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