[R] sorting data according to different boundaries

[SophiePlum]

I have 1 data frame "Data" with my main data points  (red points: latitude,
longitude and other biological parameters) and 3 other data frames for each
blue line "front_x" (latitude, longitude).
I need to sort the data (red points) according to these lines of points, so
one file for each 4 different zones.

I suppose I need to do a for loop, and according to the latitude and the
longitude of each data point...

 Can someone help me to establish the code? 


http://r.789695.n4.nabble.com/file/n4333435/Data_front.png 

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