> I want to check if two polyline overlaps with each other. asumming i
> am having polyline1 which is overlapping with polyline2 how will i
> find that it is over lapping with each other.

Some hints here -
 
http://groups.google.com/group/Google-Maps-API/browse_thread/thread/9a3908309589832e/5559ada61e38f536?lnk=gst&q=polyline+intersection#5559ada61e38f536

It's not especially easy to do this.   Do you need to know the point
(or points) of intersection, or just a yes/no condition?   Would you
do it server side or client side?

cheers, Ross K

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