[postgis-users] Units in function parameters

[Bill Thoen]

Are the units for radius in the function point_inside_circle(PointGeom, 
X, Y, Radius) the same as the X, Y units or are they related to the 
projected units of the geometry's SRS? I notice in the docs that units 
are seldom specified for functions so I'm wondering if I just missed 
some general explanation of units in parameters.  Would someone please 
clarify this?