[R] maptools sunrise sunset function

stephen sefick ssefick at gmail.com
Tue Nov 11 00:04:20 CET 2008

try tz="America/Los_Angeles"  it was three hours before tz="America/New_York"

On Mon, Nov 10, 2008 at 4:25 PM, Sebastian P. Luque <spluque at gmail.com> wrote:
> On Mon, 10 Nov 2008 15:27:52 -0500,
> "stephen sefick" <ssefick at gmail.com> wrote:
>> library(maptools) sunrise.set <- function(lat, long, date,
>> timezone="UTC", num.days=1){ #this needs to be long lat# lat.long <-
>> matrix(c(long, lat), nrow=1) day <- as.POSIXct(date, tz=timezone)
>> sequence <- seq(from=day, length.out=num.days , by="days") sunrise <-
>> sunriset(lat.long, sequence, direction="sunrise", POSIXct=TRUE) sunset
>> <- sunriset(lat.long, sequence, direction="sunset", POSIXct=TRUE) ss
>> <- data.frame(sunrise, sunset) ss <- ss[,-c(1,3)]
>> colnames(ss)<-c("sunrise", "sunset") return(ss)
>> }
>> I believe that he is refering to the code that I wrote above, which
>> relies heavily on map tools (to say the least).
> So what's the problem?  You specified timezone="UTC" so that's what
> you're getting.  WRT the warnings I do not get them, but the string
> passed may be wrong or some definitions as missing from his system.
> Sorry I cannot help with that.
> --
> Seb
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Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

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