Antsiranana in context: Street-network sprawl trends

Antsiranana in context

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
AntsirananaMadagascar (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Antsiranana plotted against Madagascar. The SNDi of new construction in Antsiranana peaked in 1976-1990, while Madagascar rose steadily. Most recently, Antsiranana's incremental SNDi fell from 4.03 to 3.24 between 1991-2005 and 2006-2020. In terms of the aggregate network, Antsiranana ranked 6th out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
3.24
Rank in Madagascar
8th of 21

Entire Network (Aggregate)

SNDi value
2.42
Rank in Madagascar
6th of 21

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
AntsirananaChutmalpurDekese

In new street additions, Antsiranana built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Chutmalpur built increasingly disconnected streets over time and Dekese fluctuated in its street-construction patterns. For the full network, Antsiranana and Chutmalpur both became progressively more disconnected, while Dekese grew more disconnected from 1975 through 1976-1990, then improved. Antsiranana and Dekese have been growing further apart in their street-network character since 1975.