Kolda: region in Senegal
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 Kolda, Senegal on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Kolda as of 2014, the overall level of street-network sprawl is 1.63, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 3.35, 1.48, 2.5 and 1.51. Disconnectivity in street construction in Kolda follows a zig-zag trend. In 1976-1990, street construction was most disconnected, while construction was most connected in 1975.
Quantity of street network construction: The street network in Kolda spans a total of 1288 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 1.51, 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 3.35, 1.47, 1.84 and 1.63. Disconnectivity in Kolda's street network follows a zig-zag trend. In 1976-1990, the region was most disconnected; while it was most connected in 1975.
The level of street-network sprawl in new development in Kolda followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in Kolda, we can consider three of its most populous cities: Kolda, Vélingara and Madina Gounass. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Kolda followed a zig-zag trend. The level of street-network sprawl in new development in Vélingara followed a zig-zag trend. The level of street-network sprawl in new development in Madina Gounass peaked in 1991-2000.
How do development practices in Kolda fare in comparison to others in Senegal? Most recently in 2001-2014, street construction in Kolda was the 9th-most disconnected out of the 13 regions in Senegal. Its position in the ranks since 1975 has fallen; relative to other regions in Senegal, street construction in Kolda has become more connected. Kolda ranked 2nd in 1975, 4th in 1976-1990, 3rd in 1991-2000 and 9th in 2001-2014.
As of 2014, the city with the most disconnected street network in Kolda is Kolda with an SNDi of 2.58, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Madina Gounass with an SNDi of -0.3, which is very well-connected. See trends for these cities: Madina Gounass, Kolda
The level of street-network sprawl in the aggregate network in Kolda followed a zig-zag trend with an overall decrease. To get a sense of how the aggregate street network has changed in Kolda, we can consider three of its most populous cities: Kolda, Vélingara and Madina Gounass. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Kolda followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Vélingara followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Madina Gounass rose steadily.
To date, Kolda is the 4th-most disconnected out of the 13 regions in Senegal. Its position in the ranks since 1975 has fallen; relative to other regions in Senegal, the street network in Kolda has become more connected. Kolda ranked 2nd in 1975, 3rd in 1976-1990, 2nd in 1991-2000 and 4th in 2001-2014.