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geometry_area_perimeter limitations not documented properly #1592

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@christophfriedrich

Essentially I would like to reopen #1400 as the documentation sentence introduced there is too vague.

The documentation reads:

There are a few limitations :

  • only works with areas up to half the size of the globe ;
  • certain large polygons may return negative values.

As someone who would like to use this function, this doesn't give me enough information to judge whether I can use the function or not:

  1. What is "large"? City size? Country size? Half the world (as possibly suggested by the bulletpoint above)?
  2. In which "certain" cases does this happen? When located near the poles or maybe across the antimeridian? When the polygon has a funny shape? Simply when exceeding a certain size?

It would be nice to provide a more concrete wording, e.g. (if correct):

large polygons over X m^2 return negative values

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