Recognition of Functional Areas Based on Call Detail Records and Point of Interest Data
Table 3
Discussion of five GASs.
Name
Layer diagram
Discussion
Raster layer
This kind of layer has no difference between cells. In reality, small segmentation makes little significance, but the theoretical basis is insufficient with large divisions. Moreover, this layer crosses the traffic corridor in the city, which may lead to incorrect identification results
Voronoi layer
All units in this layer have irregular sizes, and the accuracy of recognition obviously decreases in areas where the density of mobile base stations is high, making incorrect results more likely in these units. The phenomenon of crossing traffic corridors also exists
Road network segmentation layer
Although this layer does not cross traffic corridors, there is a huge discrepancy in the road network distribution between urban centers and suburbs, which strongly affects the results. Furthermore, the results from this layer lack practical significance
TAZ layer
There is no crossing of traffic corridors in this layer, and the division takes multiple factors into account, such as landform, administration, human history, road network, and urban function. Thus, the results are much more meaningful in terms of traffic field, land use, and urban planning
Administrative layer
The granularity of the division is somewhat coarse, making correct identification difficult. Furthermore, the recognition results are of little significance for urban planning and transportation planning