[postgis-users] Calculate accumulative bearing given a zig-zagging line

[Shaozhong SHI]

Is there a function for calculating accumulative bearing given a
zig-zagging line?

If we set a segment to travel towards north and its bearing is 0. Next
segment may zig-zag towards 10 degrees.  The following one may zig-zag
towards -5 degree.

Calculating accumulative bearing may assist us to check whether a line does
a U-turn.  If accumulative bearing is greater than 180, it is a U-turn.

Is there such function available?

Regards,

David
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