昨天浏览NASA网站，他们公布了一张最新从国际空间站拍摄的中国北京和天津地区的夜景照片。这似乎是在“告诉”我们，他们把我们这里看得很清楚，包括晚上。 原图文地址： http://www.nasa.gov/multimedia/imagegallery/image_feature_1831.html NASA网站给出的原图中，近景部分是北京，远景是天津。如果原照片没有经过旋转的话，照片就是从北京北部的上空拍摄的。这样看到的图像就是上边为南，下边为北。这不符合我们的看图习惯。 下面是原图逆时针旋转180度后的图片，上北下南，上边北京，下边天津。 为方便对照，再贴一张google earth截图，与夜景图类似，也取斜视角。 NASA原文： City Lights This striking photograph features two of China’s most populous cities--Beijing and Tianjin--both located in the northern part of the country near the Bohai Gulf. The United Nations estimated 2010 population for the Beijing metropolitan area is approximately 12 million, with the population of the Tianjin metropolitan area estimated to be over 7 million. Taken at night time by the Expedition 26 crew, the image dramatically illustrates the extent of both metropolitan areas. The smaller city of Langfang, located midway between Beijing and Tianjin, also is clearly visible, as are several other smaller developed areas to the northeast. The dark regions surrounding the well-lit urban areas are mainly agricultural fields, with wheat and corn being the major crops. Beijing is one of the recognized ancient capital cities--and the current capital--of the People’s Republic of China. The regular grid pattern of the city is clearly visible at lower upper right; concentric rings of major roadways around the city center have been added as the metropolitan area has expanded. Tianjin is a major trade center with connection to seaports on the Bohai Gulf. The city was established following the integration of the Grand Canal of China, a major artificial waterway extending from Beijing southwards to Hangzhou. Image Credit: NASA
标签: 夜景
