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 < lorenzostucch...@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 <pelder...@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 < > lorenzostucch...@outlook.it>: > >> Hi, >> >> Thanks for your reply. >> >> Il giorno 14 mar 2019, alle ore 00:43, Warin <61sundow...@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. >> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> >> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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