Table 2.

Features that have been suggested as those that might help in characterising slums*

Built environment	Construction materials for houses especially floor, wall and roofing materials† Lay-out of lanes/buildings (haphazard vs organised; high vs low entropy); road width Density of living area (people per room or per square kilometre)†
Services	Water† Sanitation† Power (electricity (legal and illegal), gas) Schools Garbage removal (public/locally organised) Health facilities/services per unit of population Transport (Euclidean and Manhattan distances from work places and facilities)
Ecology	Gradient; altitude (floodplains, areas at risk of subsidence, landslides and other hazards) Green spaces Blue spaces Air quality Environment and industrial hazards
Socioeconomic	Security of tenure/title† Poverty level Access to amenities/place of work Stigma

*This list is not exhaustive, but covers many of the main features of slums found in the literature.

†Features included in the UN-Habitat definition (table 1).