CSIinterp: Interpolate missing values for salinity object

In USGS-R/CSI: Coastal Salinity Index

Interpolate missing values for salinity object

Description

Interpolate missing monthly salinity values from salinity object for a set of sites between the first and last measured values.

Usage

CSIinterp(sal_na, limit = 6, method = "linear")

Arguments

sal_na	data.frame with Year and Month timestamp columns, with columns of site salinity values. Generally created by one of the CSIimport_ family functions.
limit	numeric. Limit length of months of gap to interpolate (default 6).
method	character. Method used to interpolate data. Dfault is "linear"; optionally "spline" for cubic spline interplation.

Value

A salinity object data.frame for calculating CSI values; has Year and Month timestamp columns, with (optionally multiple) individual columns of site salinity values with interpolated internal NAs. A "filled_gaps" attribute will be added to the salinity object listing the data and duration of gaps filled, and an "interpolation_method" attribute containing the method.

Examples

# Data file with Year and Month columns
data_path <- system.file("extdata", "Daily_South_Carolina.csv", package = "CSI")
sal_na <- CSIimport_daily(data_path)
sal <- CSIinterp(sal_na)

USGS-R/CSI documentation built on April 20, 2023, 3:57 p.m.