It isn't a matter of representation, but also how data structures could take advantage of such representations. B-trees for instance are very efficient with one

It isn't a matter of representation, but also how data structures could take advantage of such representations. B-trees for instance are very efficient with one-dimensional data. Take a look here: http://www.drdobbs.com/database/space-filling-curves-in-geospatial-appli/184410998 http://www.drdobbs.com/database/space-filling-curves-in-geos...