美国国家航空航天局NASA每日一图(天文)-2017年7月9日

2017 July 9

Earth at Night
Image Credit : NASA, NOAA NGDC, Suomi-NPP, Earth Observatory,
Data and Processing: Chris Elvidge and Robert Simmon
Explanation: Can you find your favorite country or city? Surprisingly, on this world-wide nightscape, city lights make this task quite possible. Human-made lights highlight particularly developed or populated areas of the Earth's surface, including the seaboards of Europe, the eastern United States, and Japan. Many large cities are located near rivers or oceans so that they can exchange goods cheaply by boat. Particularly dark areas include the central parts of South America, Africa, Asia, and Australia. The featured composite was created from images that were collected during cloud-free periods in April and October 2012 by the Suomi-NPP satellite, from a polar orbit about 824 kilometers above the surface, using its Visible Infrared Imaging Radiometer Suite (VIIRS).

2017年7月9日

地球的晚上
图片来源:NASA,NOAA NGDC,Suomi-NPP,Earth Observatory,
数据和处理:Chris Elvidge和Robert Simmon
说明:你能找到你最喜欢的国家或城市吗? 令人惊讶的是,在这个世界范围的夜景中,城市的灯光使得这个任务很可能。 人造灯强调地球表面特别发达和人口稠密的地区,包括欧洲,美国东部和日本的海岸。 许多大城市位于河流或海洋附近,以便他们可以乘船轻松地换货。 特别黑暗的地区包括南美洲,非洲,亚洲和澳大利亚的中心地区。 特色复合材料是通过使用其可见红外成像辐射计套件(VIIRS)从位于表面824公里的极地轨道的Suomi-NPP卫星在2012年4月和10月的无云时期收集的图像创建的。

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