Antsirabe in context: Street-network sprawl trends

Antsirabe in context

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

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Antsirabe plotted against Antananarivo and Madagascar. The SNDi of new construction in Antsirabe followed a zig-zag trend with an overall increase, compared to Antananarivo which followed a zig-zag trend with an overall increase and Madagascar which rose steadily. Most recently, Antsirabe's incremental SNDi rose from 2.58 to 3.31 between 1991-2005 and 2006-2020. In terms of the aggregate network, Antsirabe ranked 1st out of 4 cities in Antananarivo and 7th out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
3.31
Rank in Madagascar
9th of 21
Rank in Antananarivo
2nd of 4

Entire Network (Aggregate)

SNDi value
2.92
Rank in Madagascar
7th of 21
Rank in Antananarivo
1st of 4

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
AntsirabeEsperanzaTungan Fulani

While Esperanza and Tungan Fulani both built increasingly disconnected streets over time, Antsirabe fluctuated in its street-construction patterns in new street additions. Looking at the full network, Esperanza and Tungan Fulani both became progressively more disconnected, while Antsirabe fluctuated in connectivity. Antsirabe and Esperanza have been growing further apart in their street-network character since 1975.