Vào lúc 05:45 2022-10-15, Greg Troxel đã viết:
Warin <61sundow...@gmail.com> writes:
OSM does not map illegal activity.
Taken to the extreme, perhaps, but we are talking about things that are
done in the open and clearly visible to all. Landuse, by its nature,
occurs on timescales of months or longer. It is obvious that the
authorities are just as aware of landuse as a local mapper.
Applied to this discussion, the concept of declining to map landuses
that are contrary to zoning is totally ridiculous. Just in case you
aren't trolling, I'll substantively reply.
Landuse issues in the US are civil not criminal, and I suspect that's
similar in many places. The edges of what is permissible under zoning,
or under contractual land use rules, is fuzzy, and difficult to figure
out, even for people that understand the zoning rules.
To demonstrate that this isn't merely a consequence of U.S. law or the
federal system, consider that OSM is a key source of information about
informal settlements -- favelas in Brazil, Kibera in Kenya, colonias
along the Mexico-U.S. border, and countless other examples -- that might
be described as "illegal" from a certain point of view but which clearly
meet this project's verifiability standard. This information belongs on
the map.
There's also the issue of desire paths and informal trails, which in
some cases represent an accumulation of unauthorized activity. Yet we
have a well-used informal=* key, and there's even discussion among the
U.S. community about affirmatively indicating non-informal trails to
better clarify this distinction.
The actual reason we don't "map zoning" is that we don't aim to copy any
planning or zoning map verbatim. OSM aims to map the present as opposed
to (sometimes aspirational) plans about the future. A zoning map by its
nature describes what kind of construction project will be approved
going forward, while acknowledging that existing landuse may differ. We
don't have a tag to say "residential landuse but all these retail
buildings got grandfathered in". Unfortunately, people regularly come to
OSM and naïvely copy their local zoning map without regard for this
distinction, because it's often the only readily accessible landuse-like
map available from the local authorities.
Another reason, possibly specific to the U.S., is that typical zoning
terminology doesn't line up with OSM landuse terminology. For example, a
"commercial" zone might consist of retail storefronts, and a "light
industrial" zone might consist of warehouses, parking lots, and tire
stores. An inexperienced mapper copying off the zoning map would tag
these areas as landuse=commercial and landuse=industrial, respectively.
On the other hand, if a landuse=residential area happens to line up with
an area labeled "heavy industrial" on a zoning map, it's worth
double-checking whether our data is erroneous or outdated.
--
m...@nguyen.cincinnati.oh.us
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