Plot daily streamflow data symbols by year — plot_annual

Plots data symbols for a daily data set by year, either by day of year, total days, or percent of year (see plot_type argument. A column of symbols is required, default symbols = 'Symbol'. For HYDAT data, symbols include: 'E' Estimate, 'A' Partial Day, 'B' Ice Conditions, 'D' Dry, and 'R' Revised. Other symbols or categories may be used to colour points of plot. Returns a list of plots.

plot_annual_symbols(
  data,
  dates = Date,
  values = Value,
  groups = STATION_NUMBER,
  symbols = Symbol,
  station_number,
  water_year_start = 1,
  start_year,
  end_year,
  months = 1:12,
  include_title = FALSE,
  plot_type = "dayofyear"
)

Arguments

data: Data frame of daily data that contains columns of dates, flow values, and (optional) groups (e.g. station numbers). Leave blank or set to NULL if using station_number argument.
dates: Name of column in data that contains dates formatted YYYY-MM-DD. Only required if dates column name is not 'Date' (default). Leave blank or set to NULL if using station_number argument.
values: Name of column in data that contains numeric flow values, in units of cubic metres per second. Only required if values column name is not 'Value' (default). Leave blank if using station_number argument.
groups: Name of column in data that contains unique identifiers for different data sets, if applicable. Only required if groups column name is not 'STATION_NUMBER'. Function will automatically group by a column named 'STATION_NUMBER' if present. Remove the 'STATION_NUMBER' column beforehand to remove this grouping. Leave blank if using station_number argument.
symbols: Name of column in data that contains symbols. Only required if symbols column name is not 'Symbol' (default). Leave blank or set to NULL if using station_number argument.
station_number: Character string vector of seven digit Water Survey of Canada station numbers (e.g. "08NM116") of which to extract daily streamflow data from a HYDAT database. Requires tidyhydat package and a HYDAT database. Leave blank if using data argument.
water_year_start: Numeric value indicating the month (1 through 12) of the start of water year for analysis. Default 1.
start_year: Numeric value of the first year to consider for analysis. Leave blank or set well before start date (i.e. 1800) to use from the first year of the source data.
end_year: Numeric value of the last year to consider for analysis. Leave blank or set well after end date (i.e. 2100) to use up to the last year of the source data.
months: Numeric vector of months to include in plotting For example, 3 for March, 6:8 for Jun-Aug or c(10:12,1) for first four months (Oct-Jan) when water_year_start = 10 (Oct). Default plots all months (1:12).
include_title: Logical value to indicate adding the group/station number to the plot, if provided. Default FALSE.
plot_type: Character. One of c('dayofyear','count','percent'. With 'dayofyear' plot (default), the day of year for each year of data are coloured by symbols or missing dates are colours for each flow day of year. For 'count' and 'percent' plots, the total count or percent of all symbols or missing dates per year are displayed.

Value

A list of ggplot2 objects with the following for each station provided:

Annual_Symbols: a plot that contains data symbols and missing dates

Examples

# Run if HYDAT database has been downloaded (using tidyhydat::download_hydat())
if (file.exists(tidyhydat::hy_downloaded_db())) {

# Plot annual symbol counts from a data frame and data argument
flow_data <- tidyhydat::hy_daily_flows(station_number = "08NM116")
plot_annual_symbols(data = flow_data)

# Plot annual symbol counts using station_number argument with defaults
plot_annual_symbols(station_number = "08NM116")

# Plot annual symbol percentages using station_number argument and plot by annual counts
plot_annual_symbols(station_number = "08NM116",
                    plot_type = "count")
                  
}
#> $Annual_Symbols

#>