population density and city [统计] 人口密度与城市
The resulting settlement maps show how the distribution and density of the rural population around the city changed dramatically between AD 500 and 850, when copán collapsed.
由此产生的聚落地图显示，公元500年至公元850年，科潘古城崩溃时，城市周围农村人口的分布和密度发生了巨大变化。
The data resembles a heat map of population density in a given city at any point in time.
这些数据组成了一份给定任意时间给定城市人口密度的热度图。
City dwellers’ emissions per person tend to be lower, and the more planners can do to increase population density the better.
城市居民人均二氧化碳释放量更低，规划师越能提高人口密度，效果就越好。
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