Third, urban areas are confused with other land cover types.
For example, high density buildings are confused with bare
land sometimes, while low density building can be easily
classified into other land types in rural areas. Last, in many
large cities with intensive urbanization, it is hard to exclude
croplands and other non-urban lands distributed at the city
boundaries.
Although human interpretation is time-consuming, it is
the most accurate method to overcome the above difficulties.
In this study, a group of people delineated urban areas according
to the same set of criteria and finally one analyst
checked and refined the results with a consistent standard.
After interpreting urban boundaries, we excluded croplands,
rivers and mountain areas from the urban areas. Although
some cities have counties, large towns or villages that are
comparable in size, we did not take them into consideration.
Third, urban areas are confused with other land cover types.
For example, high density buildings are confused with bare
land sometimes, while low density building can be easily
classified into other land types in rural areas. Last, in many
large cities with intensive urbanization, it is hard to exclude
croplands and other non-urban lands distributed at the city
boundaries.
Although human interpretation is time-consuming, it is
the most accurate method to overcome the above difficulties.
In this study, a group of people delineated urban areas according
to the same set of criteria and finally one analyst
checked and refined the results with a consistent standard.
After interpreting urban boundaries, we excluded croplands,
rivers and mountain areas from the urban areas. Although
some cities have counties, large towns or villages that are
comparable in size, we did not take them into consideration.
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