Ambohitrimanjaka in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ambohitrimanjaka plotted against Antananarivo and Madagascar. The SNDi of new construction in Ambohitrimanjaka peaked in 1976-1990, compared to Antananarivo which followed a zig-zag trend with an overall increase and Madagascar which rose steadily. Most recently, Ambohitrimanjaka's incremental SNDi fell from 4.9 to 1.47 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ambohitrimanjaka ranked 3rd out of 4 cities in Antananarivo and 14th out of 21 in Madagascar as of 2020.

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

What about similarly populated cities?

• Dhobley, Somalia
• Satelite Norte, Bolivia
• Luvungi, Democratic Republic of the Congo
• Zégoua, Mali
• Kouroussa, Guinea
• Colina, Chile

In new street additions, Ambohitrimanjaka built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Dhobley built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Zégoua built increasingly disconnected streets over time. For the full network, Ambohitrimanjaka grew more disconnected from 1975 through 1976-1990, then improved, while Dhobley became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Zégoua became progressively more disconnected. Ambohitrimanjaka and Dhobley have been growing further apart in their street-network character since 1975.