Nzagi in context: Street-network sprawl trends

Nzagi in context

468<19751976–19901991–20052006–2020SNDi of street additions
468<19751976–19901991–20052006–2020SNDi of entire street network
NzagiLunda Norte (Region)Angola (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Nzagi plotted against Lunda Norte and Angola. The SNDi of new construction in Nzagi peaked in 1991-2005, compared to Lunda Norte which followed a zig-zag trend with an overall decrease and Angola which rose steadily. Most recently, Nzagi's incremental SNDi fell from 7.62 to 3.44 between 1991-2005 and 2006-2020. In terms of the aggregate network, Nzagi ranked 3rd out of 4 cities in Lunda Norte and 40th out of 56 in Angola as of 2020.

New Street Additions (2006–2020)

SNDi value
3.44
Rank in Angola
39th of 56
Rank in Lunda Norte
4th of 4

Entire Network (Aggregate)

SNDi value
3.33
Rank in Angola
40th of 56
Rank in Lunda Norte
3rd of 4

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
NzagiUmanItaguai

In new street additions, Nzagi built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Uman built increasingly disconnected streets over time and Itaguaí fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Nzagi and Uman have been converging in their street-network character since 1975.