[Tagging] Lyft and nameless sectioning in OSM

[Evan Carroll]

>
> if you have x number of detached residences occupied by offices,
> it is not a landuse=residential
>

Then it's mistakenly tagged. You do not use `building=detached` for shops
and offices. Per the wiki,
https://wiki.openstreetmap.org/wiki/Tag:building%3Ddetached

> A detached house is a free-standing residential building usually housing
a single family. Known as a *single-family home* in the United States,
a *single-detached
dwelling* in Canada, a *separate house* in New Zealand and *Maison
individuelle* in France.

It includes the _function_ of the building.

> it follows from the detached residences inside
>
> if all plots have fences or hedges entered in osm, or if
> the buildings touch each other, an algorithm allows you to build
> the landuse=* of each building and merge the identical landuses
> but sometimes you don't have enough info to find the value
> of the landuse, so you don't have the info to create anything
> other than a landuse=yes around each building 8or a place=plot)
>

It's not about coverage: humans tagging landuse do not have to have any
specific quantity of info. They can infer from the landuse of an entire
suburb by a specific street. And the same is true about a strip mall. If I
I have one building with 25 offices inside and that's all that's in OSM,
it's commercial. If a building has 25 shops inside and that's all that's in
OSM it's retail. Seems pretty basic. Now let's assume you have 24 retail
shops in a building and the owner is living upstairs on the second floor:
that's a 24:1 ratio. A computer can store that calculation on the landuse.
Currently the mapper just says "good enough" and the consumer is left to
wonder how accurate the mapper was.


> but this is not reality... plot boundaries can be absent from osm...
> or a large enough plot can have commercial activity on one side
> and residential activity on the other -> 2 landuse=* in osm
>

I haven't seen a single plot in Houston. I have no idea why these matter.
Lift isn't mapping out plots before they map out unnamed landuse. I don't
see how these are factoring into the conversation. Humans can't typically
observe plots. Landuse is being mapped on the basis of the buildings
contained.


> --
Evan Carroll - me at evancarroll.com
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