Hi Martin,
For another perspective, imagine someone making a world map with 85%
OpenStreetMap data and 15% XY inc. data, if someone looks on a part of
this map which is fed by these 15% XY data, you would not want to have
it incorrectly attributed to OpenStreetMap (although we are generally
the principal data provider).
Well, the example i gave previously
https://janaodaparaabastecer.vost.pt/ is a good example of what you are
saying. What do you do to fix it? Mapbox will say nothing or "believe
this is the common, VOST won't say anything. Meanwhile 99.9% of that map
is OSM a the gas station status update is provided by Waze. Sounds fair
doesn't it?
I believe the 50% rule is ok, if it refers to the displayed objects on
the screen (although this can also be arbitrary, since you can always
split a way, or interpolate nodes to get more of them).
Imagine a map which chooses a different data provider per country. For
zoomed in maps (you only see data from one provider) you would want
this one provider prominently attributed. If you attribute to someone
else more prominently and show the actual data provider only in
„others“, you will inevitably create a wrong impression about the
source, and if it’s us who miss out on visible attribution, we should
care.
Good that you mention this. On my email from 10th of October 2018 to
facebook and Mapbox (both stopped replying), i pointed out these
examples which have zero issues about having multiple sources being
attributed visibly and not hiding them:
Microsoft - Uses HERE and OSM and attributes both visibly on the
footer
https://www.bing.com/maps/?v=2&where1=48.187141%2C%2016.349561&q=48.187141%2C16.349561&cp=48.18694871145921~16.349901334904583&lvl=18&encType=1
<https://www.bing.com/maps/?v=2&where1=48.187141%2C%2016.349561&q=48.187141%2C16.349561&cp=48.18694871145921%7E16.349901334904583&lvl=18&encType=1>
ARCGIS Web - Uses OSM and ESRI data, credits both
https://www.arcgis.com/home/webmap/viewer.html?webmap=fae788aa91e54244b161b59725dcbb2a
European Commission - credits OSM and other sources
http://ec.europa.eu/transport/infrastructure/tentec/tentec-portal/map/maps.html
and
http://emergency.copernicus.eu/mapping/copernicus-emergency-management-service#zoom=2&lat=23.42974&lon=16.28085&layers=00B0T
Sadly, some say this is hard to implement. The above sites, must have a
hell of a research UX dept to make it possible and others just say it's
hard. Google does the same on "dynamic attribution". It's not rocket
science, especially when it's for desktop use, there's plenty of space
to attribute visibly. It's just excuses.
What about maps that display an overlay over a basemap? This would
lead to the overlay data provider mostly being pushed in the second
row because it is quantitatively less, but the overlay data might be
the rare unique data that is interesting. In case someone displayed an
OpenStreetMap based overlay over a different background, why would we
deliberately renounce from attribution in these cases?
We shouldn't as it would violate the license.
It is crucial that the 50% relate to the actually visible map
features, and not to the total map. If the latter was possible, you
could just fill your db with random crap in the middle of the ocean
and distort the proportion.
Obviously, we know those dirty tricks. Fatmap is a perfect example of
that
https://fatmap.com/adventures/@38.6755407,-9.1596113,3096.1899062,-40.2439178,19.7162561,31.6575309,normal
and there's is plenty of room to add the attribution visibly.
To be honest i'm kinda fed up of all of this, nothing happens. And it's
a shame stating "the license doesn't say this or that", it neither says
you must attribute with the exact text “© OpenStreetMap contributors”,
must be unreasonable calculated to acknowledge. Common sense and
fairness is all needed, not crappy legal interpretations and placing
fear for legal actions from corporate interests. Sadly i'm starting to
believe the concerns that some have shared on the list that OSMF is
being "controlled" by corporate interests and not by the spirit that it
was created.
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