Filter AmeriFlux BASE data based on plausible range

The function filters BASE data based on the expected plausible ranges specified for each variable. See AmeriFlux web site https://ameriflux.lbl.gov/data/data-processing-pipelines/data-qaqc/ for description of the plausible ranges.

amf_filter_base(
  data_in,
  limit_ls = NULL,
  basename_decode = NULL,
  loose_filter = 0.05
)

Arguments

data_in

A data frame containing BASE data, e.g., import from amf_read_base.

limit_ls

A data frame with at least three columns:

• Name: variable base name

• Min: expected lower bound

• Max: expected upper bound

If not specified, use amf_variables by default.

basename_decode

A data frame with at least two columns:

• variable_name: actual variable name

• basename: variable base name

If not specified, use amf_parse_basename by default.

loose_filter

A number in ratio (0-1) used to adjust the physical range for filtering. Set it to 0 if not used. The default is 0.05.

Value

A data frame similar to data_in filtered out off-range points

Examples

if (FALSE) {
# read the BASE from a csv file
base <- amf_read_base(file = system.file("extdata",
                                         "AMF_US-CRT_BASE_HH_2-5.csv",
                                          package = "amerifluxr"),
                      unzip = FALSE,
                      parse_timestamp = FALSE)

# filter data, using default physical range +/- 5% buffer
base_f <- amf_filter_base(data_in = base)

# filter data, using default physical range without buffer
base_f <- amf_filter_base(data_in = base, loose_filter = 0)
}