Andatabo in context: Street-network sprawl trends

Andatabo in context

34567<19751976–19901991–20052006–2020SNDi of street additions
34567<19751976–19901991–20052006–2020SNDi of entire street network
AndataboToliary (Region)Madagascar (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Andatabo plotted against Toliary and Madagascar. The SNDi of new construction in Andatabo followed a zig-zag trend with an overall decrease, compared to Toliary which followed a zig-zag trend with an overall increase and Madagascar which rose steadily. In terms of the aggregate network, Andatabo ranked 3rd out of 5 cities in Toliary and 10th out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
2.68
Rank in Madagascar
3rd of 21
Rank in Toliary
1st of 5

Entire Network (Aggregate)

SNDi value
3.48
Rank in Madagascar
10th of 21
Rank in Toliary
3rd of 5

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
AndataboUramboHaylan

In new street additions, Andatabo fluctuated in its street-construction patterns, while Urambo built increasingly disconnected streets from 1975 through 1991-2005, then improved and Haylan built increasingly connected streets over time. For the full network, Andatabo became progressively more connected, while Urambo became progressively more disconnected and Haylan became progressively more connected. Notably, Andatabo had a more connected network than Haylan in 1975 but the two have since reversed their relative ranking.