Tandjilé: region in Chad
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 Tandjilé, Chad on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Tandjilé as of 2014, the overall level of street-network sprawl is 0.51, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are -0.09, 0.69, 1.26 and 1.12. Street construction in Tandjilé 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 Tandjilé spans a total of 1358 kilometers. The period with the greatest volume of street construction was 2001-2014. These roads have an SNDi of 1.12, 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 -0.09, 0.35, 0.16 and 0.51. Disconnectivity in Tandjilé's street network follows a zig-zag trend. In 1975, the region was most disconnected; while it was most connected in 2001-2014.
The level of street-network sprawl in new development in Tandjilé peaked in 1991-2000. To get a sense of how street development has changed in Tandjilé, we can consider two of its most populous cities: Laï and كيلو Kelo. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Laï followed a zig-zag trend. The level of street-network sprawl in new development in كيلو Kelo followed a zig-zag trend with an overall increase.
How do development practices in Tandjilé fare in comparison to others in Chad? Most recently in 2001-2014, street construction in Tandjilé was the 13th-most disconnected out of the 17 regions in Chad. Its position in the ranks since 1975 has fallen; relative to other regions in Chad, street construction in Tandjilé has become more connected. Tandjilé ranked 7th in 1975, 11th in 1976-1990, 11th in 1991-2000 and 13th in 2001-2014.
As of 2014, the city with the most disconnected street network in Tandjilé is Laï with an SNDi of 0.58, which is relatively well-connected. Conversely, the most connected city is كيلو Kelo with an SNDi of -1.02, which is very well-connected. See trends for these cities: كيلو Kelo, Laï
The level of street-network sprawl in the aggregate network in Tandjilé followed a zig-zag trend with an overall increase. To get a sense of how the aggregate street network has changed in Tandjilé, we can consider two of its most populous cities: Laï and كيلو Kelo. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Laï fell steadily. The level of street-network sprawl in the aggregate network in كيلو Kelo was at its lowest in 1976-1990.
To date, Tandjilé is the 16th-most disconnected out of the 17 regions in Chad. Its position in the ranks since 1975 has fallen; relative to other regions in Chad, the street network in Tandjilé has become more connected. Tandjilé ranked 7th in 1975, 11th in 1976-1990, 14th in 1991-2000 and 16th in 2001-2014.