i using library sp suggested here , here convert degree-minute-second (dms) representation decimal degrees(dd).
if try following code using sp, result:
loc$lat<-sp::char2dms(loc$lat) error in rep(value, length.out = nrows) : attempt replicate object of type 's4'
a sample of data follows:
c("39d47m01s n", "15d38m08s n", "12d45m01s n", "13d17m25s n", "36d34m29s n", "24d46m34s s", "11d52m39s s", "39d47m01s n", "30d52m34s n", "34d59m47s s") i need convert dms dd want calculate haversine (great circle distances) between points.
i open using other packages conversion.
i tried using library birk giving me meaningless answers lat/long greater 1000. before, trying birk, had converted lat/long representation 1 birk accepts in conv_unit function
this may off, perhaps more knowledgeable me can chime in here goes.
i found thread r-help mailing list (from 6 years ago) talks converting dms decimal degrees using formula decimal degrees = degrees + (minutes/60) + (seconds/3600).
using regular expressions find appropriate element, construct data.frame used apply above mentioned formula. multiplying coordinates south , west -1 make them negative.
xy <- c("39d47m01s n", "15d38m08s n", "12d45m01s n", "13d17m25s n", "36d34m29s n", "24d46m34s s", "11d52m39s s", "39d47m01s n", "30d52m34s n", "34d59m47s s") nxy <- data.frame(degs = as.numeric(gsub("(^\\d+)(.+$)", "\\1", xy)), mins = as.numeric(gsub("(^.+d)(\\d+)(m.+$)", "\\2", xy)), secs = as.numeric(gsub("(^.+m)(\\d+)(s [a-z]$)", "\\2", xy)), direction = gsub("(^.+ )([a-z])$", "\\2", xy)) nxy$indec <- with(nxy, degs + (mins/60) + (secs/3600)) nxy[nxy$direction %in% c("w", "s"), "indec"] <- nxy[nxy$direction %in% c("w", "s"), "indec"] * -1 nxy degs mins secs direction indec 1 39 47 1 n 39.78361 2 15 38 8 n 15.63556 3 12 45 1 n 12.75028 4 13 17 25 n 13.29028 5 36 34 29 n 36.57472 6 24 46 34 s -24.77611 7 11 52 39 s -11.87750 8 39 47 1 n 39.78361 9 30 52 34 n 30.87611 10 34 59 47 s -34.99639 or, make char2dms work you.
nxy$char2dms <- as.numeric(sp::char2dms(xy, chd = "d", chm = "m", chs = "s")) degs mins secs direction indec char2dms 1 39 47 1 n 39.78361 39.78361 2 15 38 8 n 15.63556 15.63556 3 12 45 1 n 12.75028 12.75028 4 13 17 25 n 13.29028 13.29028 5 36 34 29 n 36.57472 36.57472 6 24 46 34 s -24.77611 -24.77611 7 11 52 39 s -11.87750 -11.87750 8 39 47 1 n 39.78361 39.78361 9 30 52 34 n 30.87611 30.87611 10 34 59 47 s -34.99639 -34.99639 