[R] Gps fraction of degrees function

[Clint Bowman]

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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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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>
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