Determine the 16 grid points for the Lamb classification

Compute the 16 pair of coordinates necessary for using the objective version of the Lamb method

get_lamb_points(x, y)

Arguments

x	longitude coordinate of the central point of the scheme.
y	latitude coordinate of the central point of the scheme.

Value

a data.frame with the 16 points of coordinates.

Examples

points <- get_lamb_points(x = -5, y = 40)
points
#>    lat lon label
#> 1   45  10    P6
#> 2   40  10   P10
#> 3   35  10   P14
#> 4   50   0    P2
#> 5   45   0    P5
#> 6   40   0    P9
#> 7   35   0   P13
#> 8   30   0   P16
#> 9   50 -10    P1
#> 10  45 -10    P4
#> 11  40 -10    P8
#> 12  35 -10   P12
#> 13  30 -10   P15
#> 14  45 -20    P3
#> 15  40 -20    P7
#> 16  35 -20   P11