idea: use tree amenity to work out how shady a neighbourhood is

[sa-lee]

another component to walkability could be the density of gardens/greenery around a neighbourhood

[apear9]

yes, sounds good. easy to compute given what we have already.

[tslumley]

I'd worry that data completeness for trees would be even more variable than for other amenities. For example, in Melbourne neither the Moreton Bay Figs outside the botanic gardens on Birdwood Ave, nor the plane trees along St Kilda Rd seem to be listed. Parkland areas would presumably be reliable, though.