Seiyun: city in Hadramawt, 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 Seiyun, Yemen on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Seiyun as of 2014, the overall level of street-network sprawl is 1.74, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 0.81, 1.75, 2.72 and 1.88. Street construction in Seiyun increased in disconnectivity initially but has since improved. The streets constructed in 1991-2000 were the most disconnected.
Quantity of street network construction: The street network in Seiyun spans a total of 163 kilometers. The period with the greatest volume of street construction was 1976-1990. These roads have an SNDi of 1.75, which is relatively well-connected.
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 0.81, 1.38, 1.62 and 1.74. Overall, the SNDi of the aggregate street network has risen: the street network in Seiyun has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.57 points, but between 1991-2000 and 2001-2014, it rose by just 0.11.
Seiyun and Hadramawt do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Seiyun peaked in 1991-2000, while the SNDi of street constructions in Hadramawt fell steadily.
How do development practices in Seiyun fare in comparison to others in Hadramawt? Most recently in 2001-2014, street construction in Seiyun was the 3rd-most disconnected out of the 6 cities in Hadramawt. Its position in the ranks since 1975 has risen; relative to other cities in Hadramawt, street construction in Seiyun has become more disconnected. Seiyun ranked 6th in 1975, 6th in 1976-1990, 3rd in 1991-2000 and 3rd in 2001-2014.
Seiyun and Yemen do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Seiyun peaked in 1991-2000, while the SNDi of street constructions in Yemen followed a zig-zag trend with an overall decrease.
How do development practices in Seiyun fare in comparison to others in Yemen? Most recently in 2001-2014, street construction in Seiyun was the 20th-most disconnected out of the 36 cities in Yemen. Its position in the ranks since 1975 has fallen; relative to other cities in Yemen, street construction in Seiyun has become more connected. Seiyun ranked 12th in 1975, 15th in 1976-1990, 10th in 1991-2000 and 20th in 2001-2014.
Seiyun and Hadramawt do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Seiyun rose steadily, while the SNDi of street constructions in Hadramawt fell steadily.
To date, Seiyun is the 6th-most disconnected out of the 6 cities in Hadramawt. Its position in the ranks since 1975 has not changed. Seiyun ranked 6th in 1975, 6th in 1976-1990, 6th in 1991-2000 and 6th in 2001-2014.
Seiyun and Yemen do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Seiyun rose steadily, while the SNDi of street constructions in Yemen was at its lowest in 1976-1990.
To date, Seiyun is the 25th-most disconnected out of the 36 cities in Yemen. Its position in the ranks since 1975 has fallen; relative to other cities in Yemen, the street network in Seiyun has become more connected. Seiyun ranked 12th in 1975, 15th in 1976-1990, 18th in 1991-2000 and 25th in 2001-2014.
As of 2015, Seiyun had a built-up area of 5.51 square kilometers, and a population of 105406 people.
These are some other cities with approximately the same population: