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。

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Determining the location of photos also makes it possible to combine them with geographic data bases related to climate, population density, vegetation, topography and land use.

照片拍摄地的确定也使得将照片与天气，人口密度、植被、地形、土地等地理信息联系起来成为可能。

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To our knowledge, no data are available on the risk for HIV infection among truck drivers in the North or Northeast of Brazil, an area with a vast, low population density interior.

据我们所知，没有任何数据能清楚表明广大的巴西北部与东北部人口密度较低的内陆地区卡车司机感染艾滋病病毒的风险有多大。

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