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# Copyright (C) 2014 Johannes Ranke
# Contact: jranke@uni-bremen.de
# This file is part of the R package pfm
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>
#' Read TOXSWA surface water concentrations
#'
#' Read TOXSWA hourly concentrations of a chemical substance in a specific
#' segment of a TOXSWA surface water body. Per default, the data for the last
#' segment are imported.
#'
#' @param filename The filename of the cwa file.
#' @param basedir The full path to the directory where the cwa file resides.
#' @param segment The segment for which the data should be read. Either "last", or
#' the segment number.
#' @param windows Numeric vector of width of moving windows for calculating
#' time weighted average concentrations and areas under the curve.
#' @param thresholds Numeric vector of threshold concentrations in µg/L for
#' generating event statistics.
#' @return An instance of an R6 object of class
#' \code{\link{TOXSWA_cwa}}.
#' @export
#' @author Johannes Ranke
#' @examples
#' H_sw_D4_pond <- read.TOXSWA_cwa("00001p_pa.cwa",
#' system.file("testdata/SwashProjects/project_H_sw/TOXSWA",
#' package = "pfm"))
read.TOXSWA_cwa <- function(filename, basedir = ".", segment = "last",
windows = c(7, 21), thresholds = NULL)
{
if (!missing(filename)) {
cwa <- TOXSWA_cwa$new(filename, basedir)
if (!is.null(windows[1])) cwa$moving_windows(windows)
if (!is.null(thresholds[1])) cwa$get_events(thresholds)
invisible(cwa)
} else {
message("You need to specify a filename for the cwa file to be read")
}
}
#' Plot TOXSWA surface water concentrations
#'
#' Plot TOXSWA hourly concentrations of a chemical substance in a specific
#' segment of a segment of a TOXSWA surface water body.
#'
#' @param x The TOXSWA_cwa object to be plotted.
#' @param xlab,ylab Labels for x and y axis.
#' @param time_column What should be used for the time axis. If "t_firstjan" is chosen,
#' the time is given in days relative to the first of January in the first year.
#' @param add Should we add to an existing plot?
#' @param total Should the total concentration in water be plotted, including substance sorbed
#' to suspended matter?
#' @param LC_TIME Specification of the locale used to format dates
#' @param ... Further arguments passed to \code{plot} if we are not adding to an existing plot
#' @export
#' @author Johannes Ranke
#' @examples
#' H_sw_D4_pond <- read.TOXSWA_cwa("00001p_pa.cwa",
#' system.file("testdata/SwashProjects/project_H_sw/TOXSWA",
#' package = "pfm"))
#' plot(H_sw_D4_pond)
plot.TOXSWA_cwa <- function(x, time_column = c("datetime", "t", "t_firstjan"),
xlab = "default", ylab = "default",
add = FALSE,
total = FALSE, LC_TIME = "C", ...)
{
time_column = match.arg(time_column)
cwa_column = ifelse(total, "cwa_tot_mug_per_L", "cwa_mug_per_L")
lct <- Sys.getlocale("LC_TIME")
tmp <- Sys.setlocale("LC_TIME", LC_TIME)
if (xlab == "default") {
xlab = switch(time_column,
datetime = "Time",
t = "Time [days]",
t_firstjan = "Time since first of January [days]")
}
if (ylab == "default") {
ylab = paste( ifelse(total, "Total concentration", "Concentration"), "[\u03bcg/L]")
}
if (add) {
lines(x$cwas[c(time_column, cwa_column)], xlab = xlab, ylab = ylab)
} else{
plot(x$cwas[c(time_column, cwa_column)], type = "l",
xlab = xlab, ylab = ylab, ...)
}
tmp <- Sys.setlocale("LC_TIME", lct)
}
#' R6 class for holding TOXSWA cwa concentration data and associated statistics
#'
#' An R6 class for holding TOXSWA cwa concentration data and some associated statistics.
#' Usually, an instance of this class will be generated by \code{\link{read.TOXSWA_cwa}}.
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @format An \code{\link{R6Class}} generator object.
#' @field filename Length one character vector.
#' @field basedir Length one character vector.
#' @field segment Length one integer, specifying for which segment the cwa data were read.
#' @field cwas Dataframe holding the concentrations.
#' @field events List of dataframes holding the event statistics for each threshold.
#' @field windows Matrix of maximum time weighted average concentrations (TWAC_max)
#' and areas under the curve in µg/day * h (AUC_max_h) or µg/day * d (AUC_max_d)
#' for the requested moving window sizes in days.
#' @section Methods:
#' \describe{
#' \item{\code{get_events(threshold, total = FALSE)}}{
#' Populate a datataframe with event information for the specified threshold value
#' in µg/L. If \code{total = TRUE}, the total concentration including the amount
#' adsorbed to suspended matter will be used. The resulting dataframe is stored in the
#' \code{events} field of the object.
#' }
#' \item{\code{moving_windows(windows, total = FALSE)}}{
#' Add to the \code{windows} field described above.
#' Again, if \code{total = TRUE}, the total concentration including the amount
#' adsorbed to suspended matter will be used.
#' }
#' }
#' @examples
#' H_sw_R1_stream <- read.TOXSWA_cwa("00003s_pa.cwa",
#' system.file("testdata/SwashProjects/project_H_sw/TOXSWA",
#' package = "pfm"))
#' H_sw_R1_stream$get_events(c(2, 10))
#' @keywords data
TOXSWA_cwa <- R6Class("TOXSWA_cwa",
public = list(
filename = "character",
basedir = "character",
segment = "integer",
cwas = "data.frame",
windows = "matrix",
events = "list",
initialize = function(filename, basedir, segment = "last") {
self$filename <- filename
self$basedir <- basedir
cwa_all_segments <- try(read.table(file.path(basedir, filename),
sep = "", skip = 40,
colClasses = c("character", "numeric",
"integer", rep("numeric", 5)),
col.names = c("datetime", "t", "segment",
"xcd", "cwa_tot", "cwa",
"Xss", "Xmp")))
if (!inherits(cwa_all_segments, "try-error")) {
available_segments = 1:max(cwa_all_segments$segment)
if (segment == "last") segment = max(available_segments)
if (!segment %in% available_segments) stop("Invalid segment specified")
self$segment <- segment
cwa <- subset(cwa_all_segments, segment == self$segment,
c("datetime", "t", "segment", "cwa", "cwa_tot"))
lct <- Sys.getlocale("LC_TIME"); Sys.setlocale("LC_TIME", "C")
cwa$datetime <- strptime(cwa$datetime, "%d-%b-%Y-%H:%M")
Sys.setlocale("LC_TIME", lct)
startyear = format(cwa$datetime[1], "%Y")
firstjan <- strptime(paste0(startyear, "-01-01"), "%Y-%m-%d")
cwa$t_firstjan <- as.numeric(difftime(cwa$datetime,
firstjan, units = "days"))
t_max = cwa[which.max(cwa$cwa), "t"]
cwa$t_rel_to_max = cwa$t - t_max
cwa$cwa_mug_per_L <- cwa$cwa * 1000
cwa$cwa_tot_mug_per_L <- cwa$cwa_tot * 1000
self$cwas <- cwa[c("datetime", "t", "t_firstjan",
"t_rel_to_max",
"cwa_mug_per_L",
"cwa_tot_mug_per_L")]
self$events <- list()
} else {
stop("Could not read ", filename)
}
},
moving_windows = function(windows, total = FALSE) {
window_names = paste(windows, "days")
n = length(window_names)
self$windows <- data.frame(window = window_names,
max_TWAC = numeric(n),
max_AUC_h = numeric(n),
max_AUC_d = numeric(n))
if (missing(windows)) {
stop("You need to specify at least one moving window size in days")
}
cwa_column = ifelse(total, "cwa_tot_mug_per_L", "cwa_mug_per_L")
for (i in seq_along(windows)) {
window_size = windows[i]
filter_size = window_size * 24
max_TWAC = max(filter(self$cwas[cwa_column], rep(1/filter_size, filter_size),
"convolution"), na.rm = TRUE)
max_AUC_h = max_TWAC * filter_size
max_AUC_d = max_TWAC * window_size
self$windows[i, -1] = c(max_TWAC, max_AUC_h, max_AUC_d)
}
invisible(self)
},
get_events = function(thresholds, total = FALSE) {
if (missing(thresholds)) {
stop("You need to specify at least one threshold concentration in \u03bcg/L")
}
for (threshold in thresholds) {
events = data.frame(t_start = numeric(), cwa_max = numeric(),
duration = numeric(), pre_interval = numeric(),
AUC_h = numeric(), AUC_d = numeric())
cwa_column = ifelse(total, "cwa_tot_mug_per_L", "cwa_mug_per_L")
event_end = 0
event = FALSE
event_max = 0
event_nr = 0
n_rows = nrow(self$cwas)
for (i in 1:n_rows) {
cwa_cur = self$cwas[i, cwa_column]
if (event == FALSE) {
if (cwa_cur > threshold) {
event_start = self$cwas[i, "t"]
pre_interval = event_start - event_end
i_start = i
event = TRUE
}
} else {
if (cwa_cur > event_max) event_max = cwa_cur
if (cwa_cur < threshold || i == n_rows) {
event_nr = event_nr + 1
i_end = i
if (i == n_rows) i_end = i
event_end = self$cwas[i_end, "t"]
event_length = event_end - event_start
event_cwas <- self$cwas[i_start:(i_end - 1), cwa_column]
event_AUC_h = sum(event_cwas)
event_AUC_d = event_AUC_h / 24
events[event_nr, ] = c(event_start, event_max, event_length,
pre_interval, event_AUC_h, event_AUC_d)
event = FALSE
}
}
}
self$events[[as.character(threshold)]] <- events
}
invisible(self)
},
print = function() {
cat("<TOXSWA_cwa> data from file", self$filename, "segment", self$segment, "\n")
print(head(self$cwas))
cat("Moving window analysis\n")
print(self$windows)
for (threshold in names(self$events)) {
cat("Event statistics for threshold", threshold, "\n")
if (nrow(self$events[[threshold]]) == 0) cat("No events found\n")
else print(self$events[[threshold]])
}
}
)
)
# vim: set ts=2 sw=2 expandtab:
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