Centers diurnal curves on midday

Source: R/stk_center.R

Daily values are centered on midday on a day-by-day basis. Note that this does not shift the time series properly as hours are wrapped around on a given day. This function should not be used stand-alone, and is primarily used to screen data for noise / poor quality.

stk_center(df, floor = 1.5, replace = FALSE)

Arguments

df

a skytrackr compatible data frame

floor

threshold value to center the data with (default = 1.5)

replace

replace original decimal hour values (default = FALSE)

Value

a day-by-day centered skytrackr compatible data frame

Examples


cc876 |> stk_center()
#> # A tibble: 8,640 × 8
#> # Groups:   logger, date [30]
#>    logger date_time           date         hour measurement value offset
#>    <chr>  <dttm>              <date>      <dbl> <chr>       <dbl>  <dbl>
#>  1 CC876  2021-08-02 00:04:10 2021-08-02 0.0694 lux          0.08   24.0
#>  2 CC876  2021-08-02 00:09:10 2021-08-02 0.153  lux          0.08   24.0
#>  3 CC876  2021-08-02 00:14:10 2021-08-02 0.236  lux          0.08   24.0
#>  4 CC876  2021-08-02 00:19:10 2021-08-02 0.319  lux          0.08   24.0
#>  5 CC876  2021-08-02 00:24:10 2021-08-02 0.403  lux          0.08   24.0
#>  6 CC876  2021-08-02 00:29:10 2021-08-02 0.486  lux          0.08   24.0
#>  7 CC876  2021-08-02 00:34:10 2021-08-02 0.569  lux          0.08   24.0
#>  8 CC876  2021-08-02 00:39:10 2021-08-02 0.653  lux          0.08   24.0
#>  9 CC876  2021-08-02 00:44:10 2021-08-02 0.736  lux          0.08   24.0
#> 10 CC876  2021-08-02 00:49:10 2021-08-02 0.819  lux          0.08   24.0
#> # ℹ 8,630 more rows
#> # ℹ 1 more variable: hour_centered <dbl>