Created
November 2, 2015 13:36
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update to daylight
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library(maptools) | |
library(ggplot2) | |
library(gridExtra) | |
library(scales) | |
library(jsonlite) | |
# adapted from http://r.789695.n4.nabble.com/maptools-sunrise-sunset-function-td874148.html | |
ephemeris <- function(lat, lon, date, span=1, tz="UTC") { | |
lon.lat <- matrix(c(lon, lat), nrow=1) | |
# using noon gets us around daylight saving time issues | |
day <- as.POSIXct(sprintf("%s 12:00:00", date), tz=tz) | |
sequence <- seq(from=day, length.out=span , by="days") | |
sunrise <- sunriset(lon.lat, sequence, direction="sunrise", POSIXct.out=TRUE) | |
sunset <- sunriset(lon.lat, sequence, direction="sunset", POSIXct.out=TRUE) | |
solar_noon <- solarnoon(lon.lat, sequence, POSIXct.out=TRUE) | |
data.frame(date=as.Date(sunrise$time), | |
sunrise=as.numeric(format(sunrise$time, "%H%M")), | |
solarnoon=as.numeric(format(solar_noon$time, "%H%M")), | |
sunset=as.numeric(format(sunset$time, "%H%M")), | |
day_length=as.numeric(sunset$time-sunrise$time)) | |
} | |
# for graph #1 y-axis | |
time_format <- function(hrmn) substr(sprintf("%04d", hrmn),1,2) | |
# for graph #2 y-axis | |
pad5 <- function(num) sprintf("%2d", num) | |
daylight <- function(lat=NULL, lon=NULL, place=NULL, start_date=NULL, span=365, | |
tz=NULL, show_solar_noon=FALSE, show_now=TRUE, plot=TRUE) { | |
stopifnot(span>=2) | |
if (is.null(lat) | is.null(lon) | is.null(place) | is.null(tz)) { | |
loc <- fromJSON("http://www.telize.com/geoip") | |
if (is.null(lat)) lat <- loc$latitude | |
if (is.null(lon)) lon <- loc$longitude | |
if (is.null(place)) place <- sprintf("%s, %s [%3.3f, %3.3f]", | |
loc$region, loc$country_code, | |
loc$longitude, loc$latitude) | |
if (is.null(tz)) tz <- loc$timezone | |
} | |
if (is.null(start_date)) { | |
start_date <- format(Sys.Date()-90, "%Y-%m-%d") | |
} | |
srss <- ephemeris(lat, lon, start_date, span, tz) | |
x_label = "" | |
gg <- ggplot(srss, aes(x=date)) | |
gg <- gg + geom_ribbon(aes(ymin=sunrise, ymax=sunset), fill="#ffeda0") | |
if (show_solar_noon) gg <- gg + geom_line(aes(y=solarnoon), color="#fd8d3c") | |
if (show_now) { | |
gg <- gg + geom_vline(xintercept=as.numeric(as.Date(Sys.time())), color="#800026", linetype="longdash", size=0.25) | |
gg <- gg + geom_hline(yintercept=as.numeric(format(Sys.time(), "%H%M")), color="#800026", linetype="longdash", size=0.25) | |
x_label = sprintf("Current Date / Time: %s", format(Sys.time(), "%Y-%m-%d / %H:%M")) | |
} | |
gg <- gg + scale_x_date(expand=c(0,0), labels=date_format("%b '%y")) | |
gg <- gg + scale_y_continuous(labels=time_format, limits=c(0,2400), breaks=seq(0, 2400, 200), expand=c(0,0)) | |
gg <- gg + labs(x=x_label, y="", | |
title=sprintf("Sunrise/set for %s\n\n%s\n", place, paste0(range(srss$date), sep=" ", collapse="to "))) | |
gg <- gg + theme_bw() | |
gg <- gg + theme(panel.background=element_rect(fill="#525252")) | |
gg <- gg + theme(panel.grid=element_blank()) | |
gg1 <- ggplot(srss, aes(x=date, y=day_length)) | |
gg1 <- gg1 + geom_area(fill="#ffeda0") | |
gg1 <- gg1 + geom_line(color="#525252") | |
if (show_now) gg1 <- gg1 + geom_vline(xintercept=as.numeric(as.Date(Sys.time())), color="#800026", linetype="longdash", size=0.25) | |
gg1 <- gg1 + scale_x_date(expand=c(0,0), labels=date_format("%b '%y")) | |
gg1 <- gg1 + scale_y_continuous(labels=pad5, limits=c(0,24), expand=c(0,0)) | |
gg1 <- gg1 + labs(x="", y="", title="Day(light) Length (hrs)") | |
gg1 <- gg1 + theme_bw() | |
gg1 <- gg1 + theme(panel.grid.minor=element_blank()) | |
if (plot) grid.arrange(gg, gg1, nrow=2) | |
grid.arrange(gg, gg1, nrow=2) | |
} | |
daylight() |
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