[Tagging] Mapping deforestation wikipage

Peter Elderson pelderson at gmail.com
Thu Mar 14 10:18:22 UTC 2019


You may want to look at this project:

http://geacron.com/the-geacron-project/

The tool can display/browse historical geo-data as year-to-year browseable
maps. There probably are other tools out there, mayebe even osm-based.
(This is where the real experts kick in...)

Fr gr Peter Elderson


Op do 14 mrt. 2019 om 10:54 schreef Lorenzo Stucchi <
lorenzostucchi95 at outlook.it>:

> Hi,
>
> thanks for your very interesting point, this can be a good point to thinks
> to pass to the tag landcover to sat_landcover to better distinguish the
> different vision. And sat_landcover can be a first draft info just for
> isolated land where is hard to go and check what is mapped and after this
> info can be implemented
>
> For the changes in time it depends on the availability of the satellite
> imagery. About this I found some old wiki page with some tools for
> understand the time of the Bing imagery, but they doesn’t works anymore.
>
> Best,
> Lorenzo
>
> Il giorno 14 mar 2019, alle ore 09:48, Peter Elderson <pelderson at gmail.com>
> ha scritto:
>
> I think your idea is good, but the scale and viewpoint are different from
> the regular mapping perspective.
>
> OSM-mappers map "What's on the ground" as seen from the ground, as
> detailed as possible. Satellite imagery is only used to estimate and
> confiirm. Wjhat one doesn't know, is left open. Where there is no
> landcover, no landcover is mapped.
>
> Your idea appears to colour Earth surface in large area's, according to
> predominant cover as seen from satellite. Nothing would remain empty: if
> there is nothing covering the earth, that's what you tag.
>
> I see no way to unite these perspectives in the current landcover, landuse
> and natural tagging. I think you would need a separate special tag for
> this. E.g. sat_landcover=* defined specially for this purpose. Then you can
> define "barren" as a satellite landcover, and you can set up a quality
> assurance system based on systematic review according to satellite imagery.
> Of course, other datausers will be able to use the data for rendering if
> they see fit.
>
> Since it's about changes in the course of time, how do you plan to record
> and display the changes? Yearly datasets?
>
>
> Fr gr Peter Elderson
>
>
> Op do 14 mrt. 2019 om 08:41 schreef Lorenzo Stucchi <
> lorenzostucchi95 at outlook.it>:
>
>> Hi,
>>
>> Thanks for your reply.
>>
>> Il giorno 14 mar 2019, alle ore 00:43, Warin <61sundowner at gmail.com> ha
>> scritto:
>>
>>
>> A good guide is to only map what you know, if you don't know - leave the
>> map blank. Colouring in the map may look pretty, but it may hide errors
>> that would be best left for others to find having been altered to the area
>> by the blank area.
>>
>>
>> I think that with the propose of mapping deforestation if we add data in
>> this area were the data aren’t present we don’t just coloured the map but
>> we can create a good database, from which is possible to analyse the
>> evolution of the forest area and have the possibility to study better some
>> aspect of climate change.
>>
>>
>> landcover <https://wiki.openstreetmap.org/wiki/Key:landcover>=barren
>> <https://wiki.openstreetmap.org/w/index.php?title=Tag:landcover%3Dbarren&action=edit&redlink=1>
>> .
>>
>> NO! This fails to map what is there.
>>
>>  Map the surrounding area with what you can see and leave a hole in it,
>> use a relation to do it of the type=multipolygon.
>>
>>
>> I’m not agree because If we leave a empty area this can be everything
>> that doesn’t have a tag, for example grass land where we are not sure if
>> its grass or meadow, that its hard to distinguish it from the satellite.
>>
>>
>> landcover <https://wiki.openstreetmap.org/wiki/Key:landcover>=artificial
>> <https://wiki.openstreetmap.org/w/index.php?title=Tag:landcover%3Dartificial&action=edit&redlink=1>
>>
>> Don't think so. Too general. And the text links it to are 3 land uses,
>> these are not land covers.
>>
>>
>> I’m agree with you that this can be to general, exactly there are 3
>> different tag to tag the area if better quality imagery are available and
>> is possible to distinguish between them.
>>
>>
>> landcover <https://wiki.openstreetmap.org/wiki/Key:landcover>=cultivated
>> <https://wiki.openstreetmap.org/w/index.php?title=Tag:landcover%3Dcultivated&action=edit&redlink=1>.
>>
>> This is not a land cover, it is a land use. And OSM presently prefers a
>> more detailed value.
>>
>>
>> I thinks that this is landcover, also for the reason explained in the
>> introduction and considering the previous scientific studies.
>>
>>
>> landcover <https://wiki.openstreetmap.org/wiki/Key:landcover>=trees
>> <https://wiki.openstreetmap.org/wiki/Tag:landcover%3Dtrees>
>> This at least works .. it is a land cover and it does have trees.
>> Unfortunately it does not render on many maps, so you might also tag it
>> natural=wood.
>>
>>
>> Depends what we think that is more interesting the info in the database
>> or the rendering of the map.
>>
>> Thanks for your reply.
>>
>> Best,
>> Lorenzo Stucchi
>>
>> On 14/03/19 06:49, Lorenzo Stucchi wrote:
>>
>> Hi all,
>>
>> After some discussion about the idea of this project, we think to better
>> capt all the idea to create a wiki page with the purpose of better
>> understand the problem and find the better way to tag this situation.
>>
>> So we create a wiki page
>> https://wiki.openstreetmap.org/wiki/PoliMappers/mapping_deforestation where
>> is possible to discuss these thematics, let us known your idea.
>>
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