Group zone layers into distinct vintages by geometry

Takes the fingerprints of many candidate layers and reports how many genuinely distinct geometries they contain — the measurement that decides how many zone sets must be scored, rather than assuming one per release.

Usage

zone_set_group(x, vintage_of = character())

Arguments

x

data frame with source, zone_type and geom_hash

vintage_of

named character mapping geom_hash -> YYYY-MM; hashes not named here are left NA for a human to label

Value

x with zone_set_key and vintage columns