Ambanja in context: Street-network sprawl trends

Ambanja in context

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
AmbanjaAntsiranana (Region)Madagascar (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ambanja plotted against Antsiranana and Madagascar. While Antsiranana and Madagascar both rose steadily, Ambanja's new street additions rose steadily. Most recently, Ambanja's incremental SNDi rose from 3.49 to 5.39 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ambanja ranked 2nd out of 3 cities in Antsiranana and 8th out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
5.39
Rank in Madagascar
14th of 21
Rank in Antsiranana
2nd of 3

Entire Network (Aggregate)

SNDi value
2.94
Rank in Madagascar
8th of 21
Rank in Antsiranana
2nd of 3

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

What about similarly populated cities?

246<19751976–19901991–20052006–2020SNDi of street additions
246<19751976–19901991–20052006–2020SNDi of entire street network
AmbanjaMasiphumeleleXingbieying

In new street additions, Ambanja and Masiphumelele both built increasingly disconnected streets over time, while Xingbieying built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Ambanja and Masiphumelele both became progressively more disconnected, while Xingbieying became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Ambanja and Xingbieying have been converging in their street-network character since 1975.