N'guigmi in context: Street-network sprawl trends

N'guigmi in context

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
N'guigmiDiffa (Region)Niger (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with N'guigmi plotted against Diffa and Niger. The SNDi of new construction in N'guigmi was at its lowest in 1976-1990, compared to Diffa which followed a zig-zag trend with an overall decrease and Niger which rose steadily. Most recently, N'guigmi's incremental SNDi rose from 1.35 to 1.43 between 1991-2005 and 2006-2020. In terms of the aggregate network, N'guigmi ranked 1st out of 3 cities in Diffa and 3rd out of 33 in Niger as of 2020.

New Street Additions (2006–2020)

SNDi value
1.43
Rank in Niger
3rd of 33
Rank in Diffa
1st of 3

Entire Network (Aggregate)

SNDi value
1.25
Rank in Niger
3rd of 33
Rank in Diffa
1st of 3

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
N'guigmiBasokoQuang Phu

In new street additions, N'guigmi built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Basoko fluctuated in its street-construction patterns and Quảng Phú built increasingly disconnected streets over time. Looking at the full network, Basoko and Quảng Phú both became progressively more disconnected, while N'guigmi became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. N'guigmi and Basoko have been growing further apart in their street-network character since 1975.