ff_calc_inv_mass.RdCalculates invertebrate mass (kg) based on field acreage. Requires input of the fields data frame with area_ac attribute. Returns the data frame with additional columns for calculated values. Can be chained with pipes.
ff_calc_inv_mass(df, day)An sf dataset, such as the provided dataframe ff_fields, which includes an attribute area_ac containing the field area in acres. Also works with an ordinary data.frame or tibble.
The day number for which to calculate the invertebrate mass. If not provided, then only a daily mass is calculated.
# calculate the invertebrate mass after 14 days for each field
ff_fields |> ff_calc_inv_mass(14)
#> Simple feature collection with 9628 features and 9 fields
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: 6478160 ymin: 1939404 xmax: 6762226 ymax: 2383039
#> Projected CRS: NAD83(2011) / California zone 2 (ftUS)
#> # A tibble: 9,628 × 10
#> unique_id county elev_grp geometry group_id area_ac
#> * <chr> <chr> <chr> <POLYGON [US_survey_foot]> <chr> <dbl>
#> 1 1103539 Glenn 90 to 100 ((6526707 2289953, 6526695 2289… 1802010… 23.4
#> 2 1102849 Glenn 110 to 120 ((6517766 2307611, 6517767 2306… 1802010… 23.5
#> 3 1103353 Glenn 120 to 130 ((6501679 2309168, 6501671 2309… 1802010… 1.06
#> 4 1103425 Glenn 120 to 130 ((6525986 2324730, 6525994 2324… 1802010… 1.34
#> 5 1103546 Glenn 70 to 80 ((6535820 2277869, 6535868 2277… 1802010… 48.9
#> 6 1103560 Glenn 90 to 100 ((6499898 2267008, 6499909 2267… 1802010… 15.1
#> 7 1103561 Glenn 90 to 100 ((6505757 2270476, 6504556 2270… 1802010… 34.7
#> 8 1103563 Glenn 100 to 110 ((6544553 2330567, 6544584 2330… 1802010… 24.9
#> 9 1103564 Glenn 120 to 130 ((6529293 2334151, 6529890 2334… 1802010… 74.7
#> 10 1103566 Glenn 100 to 110 ((6551712 2337179, 6552789 2337… 1802010… 56.0
#> # ℹ 9,618 more rows
#> # ℹ 4 more variables: volume_af <dbl>, area_m2 <dbl>, daily_prod_kg <dbl>,
#> # total_prod_kg <dbl>