[Tagging] Feature Proposal - RFC - Dehesa

Diego Cruz ginkarasu at gmail.com
Sat Aug 31 10:57:04 UTC 2019


Hi Peter,

A dehesa is not just a type of farmland, because the surface is covered by
trees that are regularly pruned and used for wood, so it is a mixed usage
of farmland and forestry (and pasture).

Best regards
Diego

El sáb., 31 ago. 2019 a las 12:47, Peter Elderson (<pelderson at gmail.com>)
escribió:

> It appears to be a specific type of farmland, so landuse=farmland +
> farmland=dehesa would say it all and disrupt nothing.
>
> Mvg Peter Elderson
>
> Op 31 aug. 2019 om 12:25 heeft Diego Cruz <ginkarasu at gmail.com> het
> volgende geschreven:
>
> Hi Cristoph,
>
> Thank you for your feedback, it's really appreciated. You are completely
> right when you say that dehesa might exclude similar environments in other
> parts of the world, and that is of course not my intention. I just used the
> word dehesa because it appears as such in Wikipedia. Among your three
> proposals, I would go with landuse=agroforestry, because it would be a way
> of reflecting this mixed usage of land without being too local. As for
> establishing two different landuse tags for the same territory, it could be
> fine for me, but I don't know if that would create rendering problems (as I
> mentioned, I'm new to this). I don't think this should be resolved with
> secondary tags, because a dehesa is an entity in itself and the uses of the
> land are not subordinated to each other.
>
> I will wait for more replies before modifying my proposal.
>
> Best regards
> Diego
>
> El vie., 30 ago. 2019 a las 12:00, Christoph Hormann (<osm at imagico.de>)
> escribió:
>
>> On Friday 30 August 2019, Diego Cruz wrote:
>> >
>> > I have recently proposed a new tag in the Wiki, because none of the
>> > existing landuse tags seem to match it. A dehesa is a type of land
>> > that combines a forest with either fields or pasturelands (or both)
>> > at the same time. It is extensively used in the Iberian Peninsula,
>> > both in Spain and Portugal. Please see the details in my proposal
>> > below:
>> >
>> > https://wiki.openstreetmap.org/wiki/Proposed_features/Dehesa
>>
>> This is certainly a valid idea for inventing a new tag and it is good
>> that you open up discussion early.  Let me take this as an example for
>> two things that have in the past been decisive on the broader success
>> of tags:
>>
>> * local verifiability.  The primary definition of your tag is for areas
>> in a certain region that are in the cultural tradition of that region
>> called a certain way.  You try to list a few verifiable criteria what
>> not to use the tag for - but these are one sided criteria.  Because
>> natural=wood does not rule out use as pasture (and neither does
>> landuse=orchard, which is also used for cork oak plantations),
>> landuse=farmland does not rule out the presence of trees or the use as
>> pasture and many savannas (for which we have no specific tag at the
>> moment) are created by human influence.  A good tag is one where a
>> local observer, even a casual one like a traveler quickly coming
>> through, can without much difficulty determine locally if the tag
>> applies or not.
>>
>> * generic meaning.  As already mentioned you draft this as a region
>> specific tag although agroforestry is a practice that exists in many
>> different parts of the world in different forms.  Such tag will either
>> stay a local speciality tag without much chance for being interpreted
>> by global data users and possibly mirrored by other region specific
>> tags with similar but slightly different meaning or it will morph into
>> a broad umbrella tag - for example for any kind of 'area with trees
>> that does not really qualify as wood/forest'.  Well known examples for
>> such tags are natural=fell and landuse=village_green.
>>
>> There are three potential tagging concepts i could imagine could be
>> derived from your idea that would seem more promising in that regard:
>>
>> * a tag for agroforestry landuse.  This of course would only be locally
>> verifiable if there is active agricultural use.  That would only
>> qualify those dehesas that are actively used for agriculture as such.
>> And it would say very little about the physical appearance and
>> ecological characteristics of an area.
>>
>> * establishing a generic tagging concept for secondary characteristics
>> of areas - like use of orchards as pasture, underbrush in a forest or
>> scattered trees on a meadow.  This could be quite easily implemented
>> using natural:secondary=*, landuse:secondary=* etc.  Dehesas would
>> under such scheme be something like
>>
>> - landuse=farmland + landuse:secondary=orchard
>> - landuse=meadow + landuse:secondary=orchard
>> - landuse=orchard + landuse:secondary=meadow
>>
>> * creating one or more region specific secondary tags for exising
>> primary tags like landuse=farmland or landuse=orchard for documenting
>> the region specific ecological characteristics of the area.
>>
>> --
>> Christoph Hormann
>> http://www.imagico.de/
>>
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