[Tagging] Planning route in the shade during hikes either in urban areas or forests

[bkil]

It's not my idea and it's not my wiki page (by the way, it's _our_
wiki page anyway). But this is a frequently asked problem with a
simple and effective approximation and method for estimation. Many
things in OSM are just that - an estimate. Similarly as has been
already mentioned in this thread that you seem to have missed: people
don't split roads around each pothole and they don't split sidewalks
(footways) around each and every tree, advertising column or street
lamp so that the width of the way can be accurately marked, despite
the fact that this would be quite important for users with wheelchairs
or baby strollers.

This is not a matter of coding, as has been already mention in this
thread, we don't have the 3D data at a global level (or even at a
local level) for anyone to build a service for this with what we have.
And it is not realistic to have the data available in the coming
decades either.

On Fri, Jul 16, 2021 at 8:25 PM Frederik Ramm <frederik at remote.org> wrote:
>
> Hi,
>
> On 7/16/21 19:42, bkil wrote:
> > Could you perhaps share your reasoning or what needs to be improved
> > for you to accept it or could you propose a better alternative?
>
> I'm sorry to have to say it so bluntly, but no improvement can fix this
> proposal. Whether something is in the shade or not is dependent on time
> of day and time of year. It cannot be mapped as a constant. And even if
> you were to qualify that ("at noon during the usually hottest month of
> the day") it would still mean that you'd have to split up the way in
> tons of mini pieces AND the information would be useless for someone
> seeking shade at four in the afternoon. This proposal has so many
> problems that it should have been thrown out after the first few
> exchanges. It has zero chance of being accepted.
>
> If you want routing in the shade, your router will have to employ a
> mathematical model during graph building to derive that property from
> nearby shade-giving structures. Yes, that is more complex than the "few
> lines of code" that you mention in your wiki page. But we can't pollute
> our whole database with derived information just to save someone from
> having to do the math.
>
> Bye
> Frederik
>
> --
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
>
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