This helper function is used inside of plane_seed to evaluate characteristics of observed data to use for downstream plausibility analysis.
seed_engine(input, location, cut_date = NULL)
A list
of length 1 with multiple elements corresponding to seed characteristics and metadata for the given location.
Input signal data used for seeding; must be an observed signal object
Character vector with location code
Maximum date (inclusive) for which seeding should be performed; default is NULL
and the entire input will be used for seeding