Apia in context: Street-network sprawl trends

Apia in context

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
ApiaTuamasaga (Region)Samoa (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Apia plotted against Tuamasaga and Samoa. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Apia's incremental SNDi fell from 3.15 to 2.48 between 1991-2005 and 2006-2020. In terms of the aggregate network, Apia ranked 1st out of 1 cities in Tuamasaga and 1st out of 1 in Samoa as of 2020.

New Street Additions (2006–2020)

SNDi value
2.48
Rank in Samoa
1st of 1
Rank in Tuamasaga
1st of 1

Entire Network (Aggregate)

SNDi value
4.05
Rank in Samoa
1st of 1
Rank in Tuamasaga
1st of 1

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
ApiaSopronCacapava

In new street additions, Apia built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Sopron fluctuated in street-construction patterns and Caçapava built increasingly disconnected streets over time. Looking at the full network, Sopron and Caçapava both became progressively more disconnected, while Apia grew more disconnected from 1975 through 1976-1990, then improved.