[Tagging] Feature Proposal - RFC - addr:interpolation on closed ways and nodes

[Kevin Kenny]

On Thu, Dec 24, 2020 at 4:25 PM ipswichmapper--- via Tagging <
tagging at openstreetmap.org> wrote:

> In Some places ive seen housenumbers increment by 4 or 6 in america. Why?
> I have no clue. But the assumption that it is increments of 2 shpuld not be
> assumed.
>

In many places, they try to have a specific number of housenumbers to the
mile, or they tie the housenumbers to cross streets (100-199 is this block,
200-299 is the next block, ...)  and then try to interpolate more or less
uniformly. When I lived in New York City before the days of GPS and the
mobile Internet, I carried a little reference card in my billfold that had
rules for address interpolation; one side had the tables
https://www.ny.com/locator/algorithm.html and https://www.ny.com/locator/
and the other had some rough algorithms for three of the other boroughs. (I
recall that it had nothing at all for Staten Island.) Example: 1288 Sixth
Avenue: divide by 20 gives 64.4; subtract 12 gives 52.4, so the address
should be midway between 52nd and 53rd Streets (and hence Rockefeller
Center will be the right subway stop). Lots of taxi drivers had the
Manhattan tables memorized.

Also, in areas that have large lots, it's common to skip housenumbers so
that if a lot is eventually subdivided, there is a housenumber available
without having to resort to '729A' or '729½'. The house I grew up in is
numbered '122' and the house next door is '110', but even with today's
zoning, it would be perfectly lawful to subdivide and build #114 and #118.
With the higher density that was allowed when the neighbourhood was
platted, the other housenumbers would indeed have been possible.

Still, in most (NOT all) places, the evens are on one side of the street
and the odds are on the other; it's just that interpolated addresses may
not have buildings. (Even Manhattan has the exception that Riverside Drive,
Central Park West and portions of Fifth Avenue are 'one-sided' - there are
no buildings on one side of the street, and the other side is numbered with
both evens and odds.)
-- 
73 de ke9tv/2, Kevin
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