sfn_plot: plot method for sfn_data class

In sapfluxnetr: Working with 'Sapfluxnet' Project Data

plot method for sfn_data class

Description

Plot the desired data from a site object

Usage

sfn_plot(
  sfn_data,
  type = c("sapf", "env", "ta", "rh", "vpd", "ppfd_in", "netrad", "sw_in", "ext_rad",
    "ws", "precip", "swc_shallow", "swc_deep"),
  formula_env = NULL,
  solar = TRUE,
  ...
)

Arguments

sfn_data	sfn_data object to plot. It can be also an sfn_data_multi object.
type	Character indicating which data to plot. See Type section for detailed information about the available values. Ignored if formula is provided
formula_env	Right side formula indicating an environmental variable to plot vs. the sapflow values. If NULL (default), sfn_plot will use "type" to guess which plot show.
solar	Logical indicating if the solar timestamp must be used instead of the site timestamp
...	Further arguments to be passed on geom_point or geom_col to modify geometry aesthetics.

Value

A ggplot object that can be called to see the plot. If input is an sfn_data_multi object, a list with the plots

ggplot plotting system

plot is a base R function which uses the base R plotting system to show the plot. We prefer the ggplot plotting system, which allow for storing the plots in objects and can be subjected to further modifications. This allow the package users to generate rather simple plots that can be fine tuned afterwards to the user taste. Generating a plot method for the sfn_data class returning a ggplot object is not desired (it change the way plot works and can be misleading about the plot general usage). So, instead, we offer this function, sfn_plot.

Type

type argument controls what is going to be plotted. It accepts the following:

• "sapf": It will plot sapflow data vs. TIMESTAMP

• "env": It will plot environmental variables vs. TIMESTMAP

• "ta", "rh", "vpd", "ppfd_in", "netrad", "sw_in", "ext_rad", "ws", "precip", "swc_shallow" and "swc_deep": They will plot the corresponding variable vs. TIMESTAMP

Formula

formula argument can be used to select an environmental variable to plot versus all the sapflow measurements. Any environmental variable is allowed, if it exist in the site provided.

Geometry

By default sfn_plot generates plots using geom_point geometry, except in the case of type = "ws" and type = "precip" where geom_col is used. These geometries can be modified with the ... argument.

Examples

library(ggplot2)

# data
data('ARG_TRE', package = 'sapfluxnetr')

# plotting directly
sfn_plot(ARG_TRE, type = 'sapf')

# this could be noisy, you can facet by "Tree" (for sapflow) or by
# "Variable" (for environmental data):
sfn_plot(ARG_TRE, type = 'sapf') +
  facet_wrap(~ Tree)

sfn_plot(ARG_TRE, type = 'env') +
  facet_wrap(~ Variable, scales = 'free_y')

# saving and modifying:
env_plot <- sfn_plot(ARG_TRE, type = 'env', solar = FALSE) +
  facet_wrap(~ Variable, scales = 'free_y')
env_plot + labs(title = 'Environmental variables facet plot')

# formula
sfn_plot(ARG_TRE, formula_env = ~ vpd)

sapfluxnetr documentation built on Feb. 16, 2023, 7:52 p.m.