project_boundary: Project Boundary

In christiaanpauw/AQoffset: Makes calculation needed for air quality offsetting

Description

The Air Pollution Impacts Protocol requires that a project bounbary be defined as that the spatial and temporal extent of the atmospheric states resulting from an activity above a certain threshold. This function takes a raster of concentrations resulting from an activity and a threshold value and selects the valid project extent

Usage

project_boundary(r, period = 1/365, target_period = "both",
  thresh_acute = 19, period_acute = 1/365, thresh_chronic = 2.5,
  period_chronic = 365/365, chronic_cutoff = 0.9, vebose = FALSE,
  return.mask = FALSE, maskname = "masker", only.mask = FALSE)

Arguments

r	Raster* object with concentrations resulting from an activity
period	Numeric The averaging period represented by each layer of r expressed as a fraction of 365 days, i.e. 1/365 for daily values, 1/24/365 for hourly values
target_period	Character Apply function for a chronic or an acute scenario or both. options are "chronic", "acute", "both". Defaults to "both"
thresh_acute	Numeric The threshold for the 24 hour averaging period
period_acute	The period for which the acute threshold is valid. Default 1/365
thresh_chronic	Numeric The threshold for the 1 year averaging period
period_chronic	The period for which the chronic threshold is valid. Default 365/365
chronic_cutoff	Numeric Proportion data needed to construct a valid chronic estimate. Default 0.9
return.mask	Logical that assigns the masked resolution to the global environment when TRUE
maskname	Character vector. The name attributed to the masked resolution
only.mask	Logical If TRUE the function only returns a mask and not the raster
verbose	Logical Messages or not

Value

A single layer raster shruck to the minimum neccesary extent and with NAs in all remaining cells within that extent that falls outside of the project boundary and 1 in the cells that fall within. This object is then used as a mask to select the valid region for further steps in the air pollution impacts or offsets accouting

christiaanpauw/AQoffset documentation built on May 13, 2019, 6:57 p.m.