Hi Shao, Il giorno ven 15 mag 2020 alle ore 11:56 Shaozhong SHI < [email protected]> ha scritto:
> Hi, Nicolas, > > Thanks. > > That is very interesting. I will test it. > > I could not find information on how distance is defined. 0.01 stands on > what unit? > > https://postgis.net/docs/ST_DWithin.html > Have a look to this statement in the doc you linked: """ For geometry: The distance is specified in units defined by the spatial reference system of the geometries. For this function to make sense, the source geometries must both be of the same coordinate projection, having the same SRID. For geography units are in meters and measurement is defaulted to use_spheroid=true, for faster check, use_spheroid=false to measure along sphere. """ Giuseppe.
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