#'Read the wind data from LEG
#'@description Function to read the wind speed and direction from the EPL lidar. Data can be
#'requested from \url{https://www.windopzee.net/meet-locaties/leg-introductie}.
#'@param dir directory of the files (allowed to be stored in subfolders).
#'@param h height of the measurement (63m,91m,116m,141m,166m,191m,216m,241m,266m,291m).
#'@param what choose between Speed and Direction. Wind speed as sqrt(u^2+v^2).
#'@author Marieke Dirksen
#' @importFrom rlang .data
#'@export
read_LEG<-function(dir="D:/data/Lidar/LEG/",h=63,what="Speed"){
h_opt<-c(63,91,116,141,166,191,216,241,266,291)
h_exists<-h %in% h_opt
if(h_exists==FALSE){
message("Height level not included returning FALSE, try 63,91,116,141,166,191,216,241,266 or 291")
return(FALSE)
}
leg<-list.files(dir,pattern="*\\.csv$",recursive = TRUE,full.names = TRUE)
df<-do.call("rbind",lapply(leg,function(x){data.table::fread(x,skip=1)}))
df<-df[-1,]
t.vec<-df$`Timestamp(UTC)`
t.vec<-gsub("[A-Z]"," ",t.vec)
t.vec<-as.POSIXct(t.vec,format="%Y-%m-%d %H:%M:%OS ") #
if(what=="Speed"){
I<-df[,grep("*_Ws$*", colnames(df))]
u<-subset(df,select=I) #.data$
heights<-as.numeric(gsub("[^0-9.-]", "", names(u)))
I.h<-which(heights==h)
if(length(I.h)==1){
hg<-subset(u,select=I.h)
df_h<-cbind(t.vec,hg)
df_h$h<-h
names(df_h)<-c("time","u","h")
df_h$u<-as.numeric(df_h$u)
}else{
message("multiple columns selected, returning FALSE")
return(FALSE)
}
df_h<-df_h[stats::complete.cases(df_h),]
return(df_h)
}
if(what=="Direction"){
I<-df[,grep("*_Wd$", colnames(df))]
u<-subset(df,select=I) #.data$
heights<-as.numeric(gsub("[^0-9.-]", "", names(u)))
I.h<-which(heights==h)
if(length(I.h)==1){
hg<-subset(u,select=I.h)
df_h<-cbind(t.vec,hg)
df_h$h<-h
names(df_h)<-c("time","dir","h")
df_h$dir<-as.numeric(df_h$dir)
} else{
message("multiple columns selected, returning FALSE")
return(FALSE)
}
df_h<-df_h[stats::complete.cases(df_h),]
return(df_h)
}
}
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