> Now, I consider that if I got many points from GPS device.Then the map will
> display original points and snapped points together,how can I know which
> snapped point match the certain original points?

I think you are looking to keep some kind of parent-child relationship
between one marker and another?
Have you thought about using a custom property on your markers?
You might create your original markers and add some ID
  marker.myUnique.Id = 12345 ;
the use that in your snapped-to markers
  othermarker.myParentsId = 12345 ;
Then you can find the 'parent' of any given snapped marker

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