Interpolates and scales fish body width — interpolate

Interpolates the width for a new arc length and scales it based on body length. Assumes that the input width and arc length have the same units (they could be in fractions of body length, cm, or pixels, as long as they are the same). Once the width is estimated at the new arc length, scales it based on the new maximum length.

Usage

interpolate_width(arclen0, width0, arclen, scale_to_body_length = TRUE)

Arguments

arclen0: Arc length for the width measurement. The first value should be at the head and the last value should be at the tail tip.
width0: Width measurement. Should have the same units as arclen0
arclen: New arc length
scale_to_body_length: TRUE or FALSE to scale the interpolated width by multiplying by body length. This only works if arclen is in real units (like cm) so that the last value in arclen is equal to the total length of the fish.

Value

Width at the new values of arc length, scaled for the new length

Details

Width here is defined as the distance from one side of the body to the other (like a diameter), not from the center to a side (like a radius).