[Tagging] Feature Proposal - RFC - Process tanks.

[Brian M. Sperlongano]

For the 3 types of process tanks described in the proposal (clarifiers,
aeration tanks, and oxidation ditches), they are usually open on top and
have clearly distinguishing features that make them easy to identify on
imagery, once you know what you're looking for.  The annotated photos in
the proposal were developed specifically to provide that helpful guidance
to mappers.

For some other (as yet unspecified) type of process tank which may exist,
the answer is no different than for any other feature on the map which is
hard for an armchair mapper to identify: use the surrounding context,
research the facility, and make an educated guess.  Or, a mapper can simply
say "I don't know what this" and leave it unmapped until someone with more
knowledge comes around later.

In some cases, this information is available in public sources.
For example, in The Netherlands (where my co-author is from, and where
water infrastructure is a pretty big deal), there is a public GIS source
that has data on process tanks at water treatment facilities.  The fact
that these features might be hard to identify in some cases or in some
places, should not preclude more specific and accurate tagging in places
where the information is known and/or readily available, or where these
features *are* easily identifiable.



On Sun, Mar 21, 2021 at 8:54 AM Volker Schmidt <voschix at gmail.com> wrote:

> I see a major problem with this approach to specializing high-level tags.
> When a non-expert mapper like me sees a tank, say on a Mapillary image and
> in a satellite image, what do I do with it? I see a tank that contains some
> liquid, but I do not know whether its scope is storage or processing. What
> do I do? And what about about the 400k+ storage tanks in the database some
> which in reality are processing tanks.
>
>
> On Sat, 20 Mar 2021, 22:02 Brian M. Sperlongano, <zelonewolf at gmail.com>
> wrote:
>
>> Hello,
>>
>> A request for comment is now open for the proposal "Process tanks".  This
>> proposes the new tag man_made=process_tank to tag tanks used for
>> processing, just like we have man_made=storage_tank for tanks used for
>> storage.  In addition, 3 sub-tags are proposed for specific, identifiable
>> process tanks used in water treatment facilities.  This is the third
>> proposal in a series of proposals working to improve the tagging scheme for
>> water features.
>>
>> Many thanks to those who had expertise in this area and assisted in the
>> drafting of this proposal.
>>
>> The proposal can be found here:
>> https://wiki.openstreetmap.org/wiki/Proposed_features/Process_tanks
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