If I understand this proposal right, the goal of this tag is to provide more specific information for the general likelihood of whether a water feature (only rivers?) exists: when it comes and goes every days.
This sounds like there are two pieces of information that are desirable to map: - What is the frequency of flow/presence? - Does this frequency vary over seasons? These seem like questions that deserve separate tags, for flexibility, and could benefit from a 'subtag' approach. Let's say you want to describe a river that always has current in the spring and summer, is intermittent in the fall, and has no flow in the winter. This could look like: intermittent=yes;ephemeral;no intermittent:ephemeral=autumn intermittent:yes=winter intermittent:no=spring;summer The first tag declares the frequency, but doesn't specify when each tag applies. The other 3 describe how this frequency varies over seasons. The presence of more than one value for `intermittent` would be a hint for incremental mapping/QA: there should be one `intermittent:<value>=<season>` for every value in `intermittent`. Tagging a single water feature as always `ephemeral` would also be simple and get combined with the seasonal tag: `intermittent=ephemeral` `seasonal=<season>`. I also have a follow-up about the use cases for this data. For example, for the cases I can imagine off the top of my head (scientific, humanitarian), it's valuable to know how stale the data is, how the person collecting it determined the value (memory, general impression as a local?), and ideally have a yearly report of flow (in some form or another), and so a wikidata key or external db may serve your use case better. Unfortunately, this raises a lot of hard questions about linking OSM and time series data that I don't think are solved, but it the discussion could be valuable in itself. Best, Nick On Mon, May 21, 2018 at 3:35 PM Warin <61sundow...@gmail.com> wrote: > Hi, > > Following from the discussion on "Seasonal, intermittent, and ephemeral > water tags" I have created this proposal. > > > Hopefully the definition is tight enough that it excludes intermittent, > seasonal and any other thing that is not ephemeral. > > I have also included a guide on determination so that mappers can see > how to determine if something is ephemeral. > > > So here it is ... > > https://wiki.openstreetmap.org/wiki/Proposed_features/ephemeral > > > Is it clear? Do you understand it? > > > Would you use it? If so where? > > > Any thing else? > > > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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