Pwani: region in Tanzania
What exactly constitutes the spatial extent of the city? For these aggregations, we used the Global Human Settlement Layer Urban Center Database (GHS-UCDB) to define the boundaries of the city. These cities -- or urban centers -- cover areas that are densely populated and built-up, and so may extend beyond the spatial borders of these cities that we may be familiar with. The GHS area is shaded in blue.
View Pwani, Tanzania on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Pwani as of 2014, the overall level of street-network sprawl is 4.61, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 3.97, 2.55, 4.77 and 5.15. The disconnectivity of new streets constructed in Pwani fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Pwani spans a total of 6027 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 5.15, which is highly disconnected.
Effect on the aggregate network: New construction in each period adds to the total stock of streets, but does not change streets that have already been built. Therefore, it has a limited effect on the street network as a whole. The SNDis of the aggregate street network in the respective time periods are 3.97, 3.2, 3.98 and 4.61. The SNDi of the aggregate street network in fell at first, but Pwani has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Pwani was at its lowest in 1976-1990. To get a sense of how street development has changed in Pwani, we can consider one of its most populous cities: Picha Ya Ndege. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Picha Ya Ndege followed a zig-zag trend with an overall increase.
How do development practices in Pwani fare in comparison to others in Tanzania? Most recently in 2001-2014, street construction in Pwani was the 3rd-most disconnected out of the 24 regions in Tanzania. Its position in the ranks since 1975 has fallen; relative to other regions in Tanzania, street construction in Pwani has become more connected. Pwani ranked 2nd in 1975, 13th in 1976-1990, 3rd in 1991-2000 and 3rd in 2001-2014.
As of 2014, the city with the most disconnected street network in Pwani is Picha Ya Ndege with an SNDi of 4.4, which is highly disconnected. Conversely, the most connected city is Picha Ya Ndege with an SNDi of 4.4, which is highly disconnected. See trends for these cities: Picha Ya Ndege, Picha Ya Ndege
The level of street-network sprawl in the aggregate network in Pwani was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Pwani, we can consider one of its most populous cities: Picha Ya Ndege. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Picha Ya Ndege followed a zig-zag trend with an overall increase.
To date, Pwani is the 2nd-most disconnected out of the 24 regions in Tanzania. Its position in the ranks since 1975 has not changed. Pwani ranked 2nd in 1975, 6th in 1976-1990, 2nd in 1991-2000 and 2nd in 2001-2014.