changed basemap for thumbnails to wikimedia, fixes #4459

[gannebamm]

This PR will change the default thumbnail basemap to wikimedia. This will result in some legal constraints, eg:

You License Freely Your Contributions – you generally must license your contributions and edits to our sites or Projects under a free and open license (unless your contribution is in the public domain).

The full Terms of Use is listed here: https://foundation.wikimedia.org/wiki/Terms_of_Use/en

It fixes openstreet map tileserver responding with a 404 for the thumbnail creation requests as mentioned in #4459 .

Additionally the wikimedia thumbnails have a much better resolution which results in nicer thumbnails for intermediate sized devices (bootstrap md)

BEFORE MERGING: Please read the full terms of usage

[codecov]

Codecov Report

Merging #4509 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #4509   +/-   ##
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  Coverage   59.48%   59.48%           
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  Files         230      230           
  Lines       12111    12111           
  Branches     1750     1750           
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  Hits         7204     7204           
  Misses       4323     4323           
  Partials      584      584

[gannebamm]

Travis fails due to
The command "sudo -E apt-get -yq --no-install-suggests --no-install-recommends $(travis_apt_get_options) install postgresql-9.6-postgis-2.4 nginx" failed and exited with 100 during..

Not related to the pr

[frafra]

Nice!
Have a look at https://foundation.wikimedia.org/wiki/Maps_Terms_of_Use too.
We need to update the attribution string too.

[gannebamm]

@frafra yes, but notice this will only change the tiles used for thumbnails. The basemap in mapstore/geoexplorer will stay the same.

[gannebamm]

checks had passed succesful:
https://travis-ci.org/GeoNode/geonode/builds/546347826?utm_source=github_status&utm_medium=notification

triggered a merge with global master ..

[frafra]

@frafra yes, but notice this will only change the tiles used for thumbnails. The basemap in mapstore/geoexplorer will stay the same.

Right. I think we should have attribution on all these previews, as we are violating https://www.openstreetmap.org/copyright (which has to be followed for Wikipedia maps too). A different issue+PR maybe? :-D

[frafra]

I am discussing with the Italian OSM community about that. Someone says that we could skip attribution on the preview, but only if that is a preview: if we use Wikipedia maps for the thumbnail and OSM maps for the data, I guess we will have to credit Wikipedia.

We can switch entirely to Wikipedia or attribute Wikipedia on the thumbnails I guess.

[afabiani]

@frafra any chance to have confirmation that the previews do not need attribution? I don't think so as they are static snapshots, but I'm not sure.

We should probably add some disclaimers at the bottom of the portal or somewhere on some dedicated page. This is probably part of a new PR as it requires some additional work and decisions.

[frafra]

@afabiani cannot confirm, but they should not.

I would say that we can approve this PR, as the licensing is exactly the same as OSM tiles and do another one when we are certain about how to behave in this kind of situation.