New property data structure for historical population time series

[nvkelso]

@stepps00 Have we documented how we'd do population time series data and sourcing and indication of count versus estimates? Is that in WOF properties or an issue somewhere?

I see https://github.com/whosonfirst-data/whosonfirst-data/issues/240 with:

Optional data structure where wof:population_timeseries is an array, like:

'wof:population_timeseries': [
     { population: X1, source: Y1, date: Z1, method: A1, population_rank: B1}, 
     { population: X2, source: Y2, date: Z2, method: A2, population_rank: B2}, 
     { population: X3, source: Y3, date: Z3, method: A3, population_rank: B3}
}

Where method is in

• Add new src:population:method
  • string value of: census (or count), estimate, etc

But don't think we ever formalized that beyond that initial proposal?

Originally posted by @nvkelso in https://github.com/whosonfirst-data/whosonfirst-data-admin-us/issues/203#issuecomment-2254270371

[nvkelso]

Said @stepps00:

I recall a more detailed comment on historical population data and how that could be represented in WOF, but I've checked the data, properties, and cookbook repos and don't see anything relevant. I'll keep digging around, but nothing has been implemented yet.

The proposal and src:population:method seem like they'd work well, assuming we have some logic when preferring a value for the wof:population and wof:population_rank values.