Niamey in context: Street-network sprawl trends

Niamey in context

1.622.42.8<19751976–19901991–20052006–2020SNDi of street additions
1.622.42.8<19751976–19901991–20052006–2020SNDi of entire street network
NiameyNiger (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Niamey plotted against Niger. The SNDi of new construction in Niamey followed a zig-zag trend with an overall increase, while Niger rose steadily. Most recently, Niamey's incremental SNDi rose from 1.61 to 1.91 between 1991-2005 and 2006-2020. In terms of the aggregate network, Niamey ranked 19th out of 33 in Niger as of 2020.

New Street Additions (2006–2020)

SNDi value
1.91
Rank in Niger
10th of 33

Entire Network (Aggregate)

SNDi value
1.7
Rank in Niger
19th of 33

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

What about similarly populated cities?

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
NiameyTripoliSoshanguve

While Tripoli and Soshanguve both built increasingly disconnected streets from 1975 through 1991-2005, then improved, Niamey fluctuated in its street-construction patterns in new street additions. For the full street network, though, all three cities follow the same trend. Niamey and Tripoli have been growing further apart in their street-network character since 1975.