On 18/03/19 21:32, Lorenzo Stucchi wrote:
Hi all,
Since no more doubts were presented we can think to propose this tag.
Should be better to have 4 different tag proposal one for every
different landcover, one just one considering that are all connected
and there are just the key landcover and 4 different value.
Which idea is the best for the proposal?
4 different.
I will be voting against most of it.
In particular
landcover=cultivation.. it is not a land cover but a human activity.
There is an existing OSM tag of landuse=farmland that looks to me to be
what is being mapped.
landcover=barren .. does not say what is there. And the proposal states
3 'equivalent' tags that already inuse and are fairly easy to map. Why
not use them?
landcover=artificial .. does not say what is there.
For the deforestation the above do not contribute to the documentation
of the existence of trees so they have no impact on the deforestation
itself. They may contribute to theorising on the causes of deforestation.
I think these tags are simply to ease the task, to make it easier ...
OSM is not about easier, it is about mapping.
Best,
Lorenzo
Il giorno 16 mar 2019, alle ore 09:07, Lorenzo Stucchi
<lorenzostucch...@outlook.it <mailto:lorenzostucch...@outlook.it>> ha
scritto:
Hi,
The idea is for sure to check the date of the imagery and map when
new imagery are available and we can consider also the time step
between the different satellite imagery.
The fact that some contributor modify the data is not a problem
because they will done adding new information and this is just an
improvement in the data.
Think like they are highway, I can’t known what is the type of the
highway but I can cleary see that its a road, so I can map it as
highway=road with all the problem of this case. But un other user
with better knowledge can identify which type of highway.
In a similar way there is just a different structure of
classification, and when better imagery or generally better info are
available the tag landcover will be improved with the more detailed tag.
For what regards the history I’m agree with Martin.
Best,
Lorenzo
Il giorno 15 mar 2019, alle ore 08:32, Joseph Eisenberg
<joseph.eisenb...@gmail.com <mailto:joseph.eisenb...@gmail.com>> ha
scritto:
> “The idea is to have mapathon in
> different time, when new imagery are
> available and after check what
> changed searching in the database
In this case you only need to map the area of woodland or forest
now, and it’s no problem to leave other landuse and natural areas
unmapped.
But it may be difficult to use the OSM database for checking changes
over time, if you would like scientific, publishable results.
To properly compare the current woodland area with the area in a
couple of years, you will need to make sure that the aerial imagery
that you use now is all from the same year.
Then, when you repeat the project in 1 or 2 years, you need to have
new imagery from around the same time, and you should map the
woodland or forested areas using the same standard and methods as
they first time. This will be easiest if you remap everything from
scratch the second time as well.
If you try to use the OSM database both times, you may find that
other mappers have changed things in the meantime. Perhaps they have
changed some of your landuse=forest to natural=wetland
wetland=mangrove, because they know the area better. Perhaps they
have mapped a new palm
oil plantation based on local information, but it isn’t visible in
the aerial imagery. How will you deal with such changes?
So it is great to add the forest or wood areas to OSM right now
based on the latest aerial imager.
But you should plan to keep your own copy of the database to compare
with and edit in the future. If you do this right it could be
professionally-quality data for environmental research, but that
means you need to keep a copy of the data that won’t change, and use
that for comparison in the future.
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