fasstr: plot_daily_stats – R documentation

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plot_daily_stats

Plot daily summary statistics

Description

Plots means, medians, maximums, minimums, and percentiles for each day of the year of flow values from a daily streamflow data set. Can determine statistics of rolling mean days (e.g. 7-day flows) using the roll_days argument. Calculates statistics from all values, unless specified. The Maximum-Minimum band can be removed using the include_extremes argument and the percentile bands can be customized using the inner_percentiles and outer_percentiles arguments. Data calculated using calc_daily_stats() function. Returns a list of plots.

Usage

plot_daily_stats(
  data,
  dates = Date,
  values = Value,
  groups = STATION_NUMBER,
  station_number,
  roll_days = 1,
  roll_align = "right",
  water_year_start = 1,
  start_year,
  end_year,
  exclude_years,
  complete_years = FALSE,
  months = 1:12,
  ignore_missing = FALSE,
  include_extremes = TRUE,
  inner_percentiles = c(25, 75),
  outer_percentiles = c(5, 95),
  add_year,
  log_discharge = TRUE,
  include_title = FALSE
)

Arguments

`data`	Data frame of daily data that contains columns of dates, flow values, and (optional) groups (e.g. station numbers). Leave blank 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 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.
`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.
`roll_days`	Numeric value of the number of days to apply a rolling mean. Default `1`.
`roll_align`	Character string identifying the direction of the rolling mean from the specified date, either by the first (`'left'`), last (`'right'`), or middle (`'center'`) day of the rolling n-day group of observations. Default `'right'`.
`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 to use the first year of the source data.
`end_year`	Numeric value of the last year to consider for analysis. Leave blank to use the last year of the source data.
`exclude_years`	Numeric vector of years to exclude from analysis. Leave blank to include all years.
`complete_years`	Logical values indicating whether to include only years with complete data in analysis. Default `FALSE`.
`months`	Numeric vector of months to include in analysis (e.g. `6:8` for Jun-Aug). Leave blank to summarize all months (default `1:12`).
`ignore_missing`	Logical value indicating whether dates with missing values should be included in the calculation. If `TRUE` then a statistic will be calculated regardless of missing dates. If `FALSE` then only those statistics from time periods with no missing dates will be returned. Default `FALSE`.
`include_extremes`	Logical value to indicate plotting a ribbon with the range of daily minimum and maximum flows. Default `TRUE`.
`inner_percentiles`	Numeric vector of two percentile values indicating the lower and upper limits of the inner percentiles ribbon for plotting. Default `c(25,75)`, set to `NULL` for no inner ribbon.
`outer_percentiles`	Numeric vector of two percentile values indicating the lower and upper limits of the outer percentiles ribbon for plotting. Default `c(5,95)`, set to `NULL` for no outer ribbon.
`add_year`	Numeric value indicating a year of daily flows to add to the daily statistics plot. Leave blank for no years.
`log_discharge`	Logical value to indicate plotting the discharge axis (Y-axis) on a logarithmic scale. Default `FALSE`.
`include_title`	Logical value to indicate adding the group/station number to the plot, if provided. Default `FALSE`.

Value

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

Daily_Stats

a plot that contains daily flow statistics

Default plots on each object:

`Mean`	daily mean
`Median`	daily median
`25-75 Percentiles`	a ribbon showing the range of data between the daily 25th and 75th percentiles
`5-95 Percentiles`	a ribbon showing the range of data between the daily 5th and 95th percentiles
`Minimum-Maximum`	a ribbon showing the range of data between the daily minimum and maximums
`'Year'`	(on annual plots) the daily flows for the designated year

Examples

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

# Plot daily statistics using a data frame and data argument with defaults
flow_data <- tidyhydat::hy_daily_flows(station_number = "08NM116")
plot_daily_stats(data = flow_data,
                 start_year = 1980)
                  
# Plot daily statistics using only years with no missing data
plot_daily_stats(station_number = "08NM116",
                 complete_years = TRUE)
 
# Plot daily statistics and add a specific year's daily flows                
plot_daily_stats(station_number = "08NM116",
                 start_year = 1980,
                 add_year = 1985)                
                  
# Plot daily statistics for 7-day flows for July-September months only
plot_daily_stats(station_number = "08NM116",
                 start_year = 1980,
                 roll_days = 7,
                 months = 7:9)

# Plot daily statistics without a log-scale Discharge axis
plot_daily_stats(station_number = "08NM116",
                 start_year = 1981,
                 end_year = 2010,
                 log_discharge = FALSE)
                 
}

fasstr

Analyze, Summarize, and Visualize Daily Streamflow Data

v0.3.2

Apache License 2.0

Authors

Jon Goetz [aut, cre] (<https://orcid.org/0000-0002-4993-1119>), Carl James Schwarz [aut], Robin Pike [ctb], Province of British Columbia [cph]

Initial release