[openstreetmap/openstreetmap-website] Set bounding box size limits based on surface dimensions (Issue #4910)

[Christoph Hormann]

> I'll have to check my numbers at home but the initial limit is such that only something like 0.01% of changesets have ever been larger than that and most of those are abuse.

I am well aware of that, mapping in polar regions is very rare, so if you go by absolute numbers you can ignore it.  If, however, the OSM community wants to be serious about creating the best map of the world then it cannot.

My estimate is that probably around 90 percent of all mappers trying to edit physical geography at very high latitudes (Northern Greenland, Antarctic interior) will run into the read API 0.25 square degree limit.  It will be less for the changeset size limit obviously - but as said, in contrast to data reading this is a hard limit.

What i am suggesting is not a big change, it would just replace a grossly inadequate concept of bounding box size with a decent approximation.  We are not talking about values being off by ten percent or so here, we are talking about a factor of 5-10 or more.  I mentioned that at the equator 0.5*0.5 degrees is about 3000 square kilometers.  At 83 degrees latitude (Northern Greenland) it is about 360 square kilometers.

Incidentally what i suggest would also allow communicating the changeset size limit in a more meaningful way (as a new mappers you must not edit things more that X kilometers apart in a single changeset).

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