This is the density of the city of Philadelphia.
The concentric model is helpful in that it is very simplistic and easy to comprehend; however, it has its weaknesses. It is rather inaccurate in that it does not account for physical barriers that would disrupt the round shape.
The sector model is only really helpful in British cities, because that is what it was originally intended for. It based on the early twentieth century transport so it is rather irrelevant other than in British cities.
The multi nuclei model is helpful in that it gives a useful framework for comprehending the different social and economic groups. Its weak in that many do not consider this a model, and that it assumes the land is flat with even distribution of resources.
The sector model is only really helpful in British cities, because that is what it was originally intended for. It based on the early twentieth century transport so it is rather irrelevant other than in British cities.
The multi nuclei model is helpful in that it gives a useful framework for comprehending the different social and economic groups. Its weak in that many do not consider this a model, and that it assumes the land is flat with even distribution of resources.