Check if the coordinates are correct.
check_coordinates(xmn, xmx, ymn, ymx)The coordinates defining the study area.
Return a set of valid coordinates.
check_coordinates(NA, NA, NA, NA)
#> [1] -180 180 -90 90 1 1
check_coordinates(-200, 0, 0, 90)
#> Warning: [xmn; xmx] range larger than accepted values [-180; 180]. The limits were set to -180 and/or 180.
#> [1] -180 0 0 90 1 0
check_coordinates(20, 0, 90, 0)
#> Warning: xmn was larger than xmx. The two values were inverted.
#> Warning: ymn was larger than ymx. The two values were inverted.
#> [1] 0 20 0 90 0 0