The following (untested) should get you close:
deg<-as.integer(strsplit(coords, "?")[[1]][1])
min<-as.integer(strsplit(strsplit(coords, "?")[[1]][2],
"'")[[1]][1])
sec<-as.numeric(strsplit(strsplit(strsplit(coords, "?")[[1]][2],
"'")[[1]][2], "\"")[[1]][1])
nswe<-strsplit(strsplit(strsplit(coords, "?")[[1]][2],
"'")[[1]][2], "\"")[[1]][2]
deg.frac<-((sec/60+min)/60+deg
deg.frac<-ifelse(nswe=="S"|nswe=="E",-deg.frac,deg.frac)
Clint
--
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Air Quality Modeler INTERNET: cl...@math.utah.edu
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PO Box 47600 FAX: (360) 407-7534
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On Wed, 21 Dec 2011, Alaios wrote:
Dear all,?? I have the following written example
coords <- "51?30'48.58\"N"
as.integer(strsplit(coords, "?")[[1]][1])
[1] 51
as.integer(strsplit(strsplit(coords, "?")[[1]][2], "'")[[1]][1])
[1] 30
as.numeric(strsplit(strsplit(strsplit(coords, "?")[[1]][2], "'")[[1]][2],
"\"")[[1]][1])
[1] 48.58
strsplit(strsplit(strsplit(coords, "?")[[1]][2], "'")[[1]][2], "\"")[[1]][2]
[1] "N"
My code gets from the coords degrees , minutes, seconds and finally the N/S/W/E
Could you please tell me if there is any function in R that can convert all the
above into fractions of degrees (single numerical value).
B.R
Alex
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