Dear R users,
#----------------------------------------------------------------------------------------------------------------------------
#There is table containing 1000 (lat, lon, time) GPS positions, wchich should
be recognized and labeled in every row of that #recognized position by label
from defined POI vector
GPS$Lat =c(9,2.2,2,3,4,5,6,7,2,9,2.1,10,3.3,0 , 6, 8, 9)
GPS$Lon =c(0,1 ,1,4,4,5,6,7,2,9,1.1,10,4.2,0 , 6, 1, 9)
GPS$time =c(0,1 ,2,3,4,5,6,7,8,9,10 ,11,12 ,13,14,15,16)
# and definition of points of interest:
POIdef$Lat =c( 2 ,3.2)
POIdef$Lon =c( 1.1 ,4 )
POIdef$Lab =c("A" ,"B")
# but if there are two recognitized points in the small time difference,
# (within time window of tw=3)
# there should be choosen only one point from POIdef
#Result expected:
#like in these vectors:
(GPSfindings$Lat =c(2.2, 2.1, 3.3 ) )
(GPSfindings$Lon =c(1 , 1.1, 4.2 ) )
(GPSfindings$time =c(2 ,10 , 12 ) )
(GPSfindings$Lab =c("A","A" , "B" ) )
(GPSfindings$POI_lat =c(2 ,2 , 3.2 ) )
(GPSfindings$POI_lon =c(1.1,1.1 , 4.1 ) )
#and as result obtain marked vector:
(GPS$Lab=c(NA,"A",NA,NA,NA,NA,NA,NA,NA,"B",NA,NA,NA,NA,NA,NA))
#1) Is that possible without using specialized package?
#2) Any specialized package function realize that?
#------------------------------------------------------------------------------------------------
Thanks for suggestions.
Sincerely, Eugen
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