Atlantis in context: Street-network sprawl trends

Atlantis in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
AtlantisWestern Cape (Region)South Africa (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Atlantis plotted against Western Cape and South Africa. The SNDi of new construction in Atlantis was at its lowest in 1991-2005, compared to Western Cape which rose steadily and South Africa which rose steadily. Most recently, Atlantis's incremental SNDi rose from 2.44 to 2.7 between 1991-2005 and 2006-2020. In terms of the aggregate network, Atlantis ranked 1st out of 14 cities in Western Cape and 12th out of 81 in South Africa as of 2020.

New Street Additions (2006–2020)

SNDi value
2.7
Rank in South Africa
13th of 81
Rank in Western Cape
1st of 14

Entire Network (Aggregate)

SNDi value
2.56
Rank in South Africa
12th of 81
Rank in Western Cape
1st of 14

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
AtlantisBorazjanGrand Goave

In new street additions, Atlantis built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Borazjan fluctuated in its street-construction patterns and Grand Goâve built increasingly disconnected streets over time. For the full network, Atlantis became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Borazjan fluctuated in connectivity and Grand Goâve became progressively more disconnected. Notably, Atlantis had a more sprawly network than Grand Goâve in 1975 but the two have since reversed their relative ranking.