利用卫星图像分析南京信息工程大学校园变化特征

Evolution characteristics of NUIST campus using satellite images

本文主要目的是利用卫星图像资料分析南京信息工程大学(Nanjing University of Information Science and Technology,NUIST)建校之初至今校园的变化特征.共分析了1964年11月至1970年12月之间的5幅无云的美国侦察卫星图像(1995年解密),地理配准后图像的位置精度为4.8至7.8 m,图像中的建筑物、道路和水体都清晰可见.通过对比这些黑白的侦察卫星图像与2006—2018年的Google Earth彩色图像,发现现在校园面积远远大于旧校园;旧图像里中苑老操场跑道长度为298 m,2006年Google Earth图像中为406.5 m,操场中心点向东移动了9 m,向南移动了47 m.侦察卫星图像和Google Earth图像都是以统一坐标系做地理位置校正,相关图像见附件.

This study aims to examine change features from the early years of the Nanjing University of Information Science and Technology(NUIST)to present using satellite images.A total of five cloud-free images acquired between November 1964 and December 1970 have been analyzed.The image positional accuracy after georeferencing is in the range of 4.8 and 7.8 m.Buildings,road structures,and water bodies are clearly discernible in these images.A comparison has been made between these black and white spy satellite images and color images from the Google Earth collection for the period between 2006 and 2018.The present-day campus is considerably larger than the old campus.Additionally,the old track field has expanded from a total track length of 298 m according to a 1968 spy image to 406.5 m according to a Google Earth 2006 image,and the center of the field has moved east by 9 m and south by 47 m.The spy and Google Earth images are georeferenced to a common coordinate and are archived as online supplements to this paper.