Ta`izz: region in Yemen
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 Ta`izz, Yemen on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Ta`izz as of 2014, the overall level of street-network sprawl is 4.18, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 5.23, 2.91, 3.22 and 4.68. The disconnectivity of new streets constructed in Ta`izz fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Ta`izz spans a total of 2466 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 4.68, 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 5.23, 3.74, 3.62 and 4.18. The SNDi of the aggregate street network in fell at first, but Ta`izz has worsened in disconnectivity since 2000.
The level of street-network sprawl in new development in Ta`izz was at its lowest in 1976-1990. To get a sense of how street development has changed in Ta`izz, we can consider two of its most populous cities: Ta'izz and As Samkar. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Ta'izz was at its lowest in 1991-2000. The level of street-network sprawl in new development in As Samkar followed a zig-zag trend.
How do development practices in Ta`izz fare in comparison to others in Yemen? Most recently in 2001-2014, street construction in Ta`izz was the 6th-most disconnected out of the 16 regions in Yemen. Its position in the ranks since 1975 has risen; relative to other regions in Yemen, street construction in Ta`izz has become more disconnected. Ta`izz ranked 10th in 1975, 9th in 1976-1990, 13th in 1991-2000 and 6th in 2001-2014.
As of 2014, the city with the most disconnected street network in Ta`izz is As Samkar with an SNDi of 4.2, which is highly disconnected. Conversely, the most connected city is Ta'izz with an SNDi of 2.42, which is in the 40th to 60th percentile of disconnectedness. See trends for these cities: Ta'izz, As Samkar
The level of street-network sprawl in the aggregate network in Ta`izz was at its lowest in 1991-2000. To get a sense of how the aggregate street network has changed in Ta`izz, we can consider two of its most populous cities: Ta'izz and As Samkar. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Ta'izz fell steadily. The level of street-network sprawl in the aggregate network in As Samkar followed a zig-zag trend.
To date, Ta`izz is the 10th-most disconnected out of the 16 regions in Yemen. Its position in the ranks since 1975 has not changed. Ta`izz ranked 10th in 1975, 13th in 1976-1990, 14th in 1991-2000 and 10th in 2001-2014.