城市人口的遥感估算方法

常规人口估算方法耗时、费力、财物消耗大且周期长,况且,仅靠少数年份的人口统计资料也是难以准确揭示人口状况的。尽管应用遥感方法估算人口的历史并不长,精度也还不高,但已显示了其优越性。遥感估算人口的主要原理如下。 (1)美国国防卫星及NOAA卫星的热红外通道图像说明,人口分布及其数量与城市耗能量(人工热源)相关,而耗能量又与图像灰度相关;(2)城市人口的膨胀与城市面积的扩展相关;(3)像片上进行住宅计数,用人口普查资料或抽样调查方法确定每户平均人数则可进行人口估算;4)人口密度大小也反映在人工结构物及自然物体的波谱反射率差异上,据此可建立人口数量与反射率的回归方程。

The Method of Estimating Population in City Using Remote Sensing

Not only does conventional estimation of population take long time, drain of man-power and money, but also it is unaccurate because it depends on statistic data of few years. Although the history of estimating population using remote sensing is not long and not precise, but it is showing its advantage. The principles of estimating population using remote sensing are: 1, The image of infrared channel in DMSP shows that the distribution and number of population relates with urban consumption of energy, and in turn, the urban consumption of en-erpy relates with grayscale; 2, The population growth relates with expansion of urban area can be generated regression equation; 3, Counting of residences in image can estimate population based on average numbers of every recidence lefined by census; 4, Density of population can be reflected in difference of reflectance of man-made structure and natural body, accordingly it can be generated regression equation.