[postgis-users] Checking the point location against a line

[Ray G. Lu]

Hello
This is my first email (From NZ) to this lovely community.
My question:
Is there a function provided by PostGIS can check
a point location against a line?

E.g.
################################################

                                          P(x0,y0)  Above the line

This is line
-------------------------------o-------------------------------------
                                P(x1,y1) On the line

                                       P(x2,y2) Below the line
################################################


Thanks in advance,

G. Lu
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