New rWind release on CRAN! (v1.0.2)

July 4, 2018
By

(This article was first published on long time ago..., and kindly contributed to R-bloggers)

Hi there!
Just a few lines to inform you about the new release of rWind R package (v1.0.2). This version have several new features. Here you have an example of one of them, the function wind.dl_2 to download time series of wind data. In this example we create a bunch of PNG files to be converted later into a GIF of wind speed of east Asia region.
Enjoy!

 # We will create a gif of wind speed for east Asia during the end of June (2018)  

# First, we should load the packages that we will use. Use install.packages() to
# download and install the new version of rWind (v1.0.2)

install.package("rWind")

library(rWind)

library(fields)
library(shape)
library(rworldmap)
library(lubridate)

# Now, we use lubridate package to create a sequence of dates/times (each three
# hours)

dt <- seq(ymd_hms(paste(2018,6,25,00,00,00, sep="-")),
ymd_hms(paste(2018,7,4,21,00,00, sep="-")),by="3 hours")

# Now, we use the new function wind.dl_2 to download the whole time series of
# wind data. We use the "dt" object created with lubridate to provide the input
# to wind.dl_2. Since it's a large area and many days, it could take a while...

wind_series <- wind.dl_2(dt,90,150,5,40)

# Next, we can use wind2raster function from rWind package directly over the
# output from wind.dl_2, it has been adapted to work with this lists of wind
# data.

wind_series_layer <- wind2raster(wind_series)

# Finally, we will create a bunch of PNG files to be converted later in a GIF

id<-0
for (i in 1:72) {
id <- sprintf("%03d", i)
png(paste("asia",id,".png", sep=""), width=1000, height=600, units="px",
pointsize=18)
image.plot(wind_series_layer[[i]]$wind.speed, col=bpy.colors(1000),
zlim=c(0,18), main =wind_series[[i]]$time[1])
lines(getMap(resolution = "low"), lwd=3)
dev.off()
}

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