This thread seems to ignore the fact that web2py_postgresql support GIS.
>

Good point.

To calculate distances in meters over positions in degreees, define a
"geography" field instead of a "geometry" one:
http://postgis.refractions.net/docs/ST_Distance.html

The BBOX optimization still applies, unless you used "ST_DWithin":
http://postgis.refractions.net/documentation/manual-2.0/ST_DWithin.html

Oscar-

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