HERON - HElpers for River ObservatioN

The goal of HERON is to provide a suite of helpful supplementary functions for workflows involving the EGRET and SiZer R packages.

Installation

You can install the development version of HERON from GitHub with:

# install.packages("devtools")
devtools::install_github("lter/HERON")

HERON Functions

Here are the functions currently included in HERON:

EGRET Helper Functions

• egret_report: Generate a coarse PDF report containing plots of EGRET function outputs. Useful for quickly characterizing a suite of patterns in the data though allows little aesthetic customization and is thus best used only for this preliminary “first look”

• egret_trends: Calculates flow normalized concentration and flux using EGRET::tableChangeSingle and exports a single data object containing both datasets (includes a column named “Metric” to help users split the objects post hoc)

SiZer Helper Functions

• sizer_slice: Extract the SiZer-identified slope for a specified bandwidth and returns this information as a dataframe

• sizer_aggregate: Aggregate SiZer-identified slope types across all bandwidths and return this information as a dataframe

• sizer_plot: Creates base R plot of SiZer object with horizontal lines at specified bandwidths

• id_slope_changes: Migrate slope changes identified by SiZer::SiZer information into the supplied data object

• id_inflections: Migrate inflection points implied by SiZer::SiZer information (“implied” because it only identifies slope changes to/from flat slopes) into the supplied data object

• sizer_ggplot: Creates ggplot2 plot of trendline with inflection points and/or slope changes identified by SiZer included as vertical lines. Also allows specification of type of trendline to fit to data

• sizer_lm: Fits linear regressions on each “chunk” of the trendline (i.e., sections of trendline that share a common slope as identified by id_inflections or id_slope_changes)

Misc. Other Functions

• hydro_day: Accepts a calendar date and converts it into an equivalent “hydro day”. Allows user to specify the first month of the hydrologic year as this may differ by hemisphere