[Tagging] RFC - Key: spacing=*

[Martin Koppenhoefer]

The term spacing to me would suggest "space between", i.e. the clear
distance between the things. I would prefer to use the distance of the
centres (dimension between axes / centres) of things. It is also easier to
estimate (total distance / (number-1)) and you don't have to assume median
diameters etc. for irregular things like tree trunks.

Cheers,
Martin
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