[Tagging] Estimated values for height
Sergio Manzi
smz at smz.it
Sun Nov 11 11:15:45 UTC 2018
Hello everybody,
I'm the one who, in the Italian mailing list, first brought out the issue about how to tag estimated heights (/in our context it was about trees height/).
My first proposal has been to use a new sub-key in which to store estimated values, as in "height:estimated=10".
Then I saw, here, the proposal of using "source:height=estimated", which is in use (/1543 entries, mostly applied to ways: see: /[1]), which I thought was a better solution then the one I originally conceived.
Now I see that there is a different solution in use, "height:source=estimated", which is less used (/149 entries, mostly applied to ways: see: /[2]), but *makes even more sense to me, from a syntactical point of view*.
Someone also proposed to use "height:accuracy=*" if the accuracy is known, but I think this could be used for an estimated value too (height:accuracy=estimated). On the other hand this doesn't seems to be in use anywhere even though it might be considered an even better solution both syntactically and semantically (/I think "source" should be used to identify "who" is the originator of the information/).
In any case I think the various est_(width|length|height|whatever) keys should be deprecated and a new universal solution to identify estimated values should be adopted, taken from the ones described above (/or a new one I'm not thinking of//at this time/)/./
Regards,
Sergio
[1] https://taginfo.openstreetmap.org/tags/source%3Aheight=estimated
[2] https://taginfo.openstreetmap.org/tags/height%3Asource=estimated
On 2018-11-11 10:07, bkil wrote:
> Yes, that sounds reasonable. Also there's height:accuracy if you know your error.
>
> On Fri, Nov 9, 2018 at 11:42 AM Dave Swarthout <daveswarthout at gmail.com <mailto:daveswarthout at gmail.com>> wrote:
>
> You can also use height=* for both and add a "source:height=estimated / measured" tag with that to have a value that is usable by the apps and tools but still keeping the information that it was only estimated ! ;-)
>
> An excellent solution, Lionel
>
> On Fri, Nov 9, 2018 at 5:06 PM marc marc <marc_marc_irc at hotmail.com <mailto:marc_marc_irc at hotmail.com>> wrote:
>
> look at the current values in height, you understand from their
> round values that they are massively estimated.
>
> my preference is therefore to use height and make 2 changset
> to put a changeset tag related to the source
> of the measurement: measured <> estimated
>
> Le 09. 11. 18 à 10:57, Lionel Giard a écrit :
> > You can also use height=* for both and add a "souce:height=estimated /
> > measured" tag with that to have a value that is usable by the apps and
> > tools but still keeping the information that it was only estimated ! ;-)
> >
> >
> > Lionel
> >
> >
> >
> > Le ven. 9 nov. 2018 à 10:19, Dave Swarthout <daveswarthout at gmail.com <mailto:daveswarthout at gmail.com>
> > <mailto:daveswarthout at gmail.com <mailto:daveswarthout at gmail.com>>> a écrit :
> >
> > There is already an est_width tag (Taginfo 77,000). I see no reason
> > why you couldn't use est_height, which has over 1000 instances in
> > Taginfo.
> >
> > Dave
> >
> > On Fri, Nov 9, 2018 at 3:58 PM Cascafico Giovanni
> > <cascafico at gmail.com <mailto:cascafico at gmail.com> <mailto:cascafico at gmail.com <mailto:cascafico at gmail.com>>> wrote:
> >
> > I'm going to import a small dataset of trees. Some tree heights
> > are defined as "measured", some as "estimated".
> >
> > About estimated values, I've found a wiki definition only for
> > width [1]: shall I
> > derive an est_height tag,
> > go for most popular taginfo solutions,
> > simply assign an estimated value to height tag?
> >
> >
> >
> > [1] https://wiki.openstreetmap.org/wiki/Key:est_width
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> > --
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> > Homer, Alaska
> > Chiang Mai, Thailand
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