摘要
考虑不同传感器光谱响应函数差异及不同地物类型反射率光谱的差异,提出了一种逐像元辐射归一化方法,并以2017年7月17日内蒙古达里诺尔湖地区准同步过境的Sentinel-2A及Landsat 8数据为例,对两类数据可见-近红外波段(VNIR)地表反射率结果进行归一化。首先采用Sen2cor方法及NASA官方提供大气校正算法,分别对Sentinel-2A及Landsat 8 OLI影像进行大气校正并重采样到同一空间分辨率;然后基于光谱库计算匹配因子并构建图像与光谱库之间的匹配转换模型,实现像元尺度上从Sentinel-2影像到Landsat 8影像地表反射率相似波段之间的转换。结果表明,经逐像元归一化的影像相比原始影像及经HLS光谱归一化的影像,与Landsat 8 VNIR波段的相关性明显提高,辐射一致性增强。该转换模型为多源中高分辨率遥感图像高精度辐射归一化提供了新思路。
Taking the spectral response of different remote sensors and the spectral differences of ground objects into account,this paper presents a pixel-by-pixel radiometric normalization method.The data with similar bands visible-near infrared(VNIR)of Sentinel-2A and Landsat 8 OLI are taken as an example,which are acquired over quasi-simultaneously in Gudarinor Lake area of Inner Mongolia province,on July 17,2017.Firstly,the surface reflectance is derived from Sentinel-2A and Landsat 8 OLI images by the Sen2cor method and the NASA officially atmospheric correction algorithm respectively,and resampled to the same spatial resolution.Then,the matching factor is calculated based on the spectral library and the transformation model between the image and the spectral library is constructed to covert the surface reflectance from the Sentinel-2A image into the Landsat 8 image pixel-by-pixel.The results show that compared with the original image and the HLS spectral normalized image,the correlation of VNIR band between the pixel-by-pixel normalized image and the Landsat 8 VNIR is significantly improved and the radiation consistency is enhanced.This transformation model provides a new idea for high precision radiation normalization of multi-source medium-to-high resolution remote sensing images.
作者
徐玉雯
张浩
陈正超
景海涛
XU Yuwen;ZHANG Hao;CHEN Zhengchao;JING Haitao(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Institute of Remote Sensing and Digital Earth,Chinese Academy of Science,Beijing 100094,China)
出处
《测绘通报》
CSCD
北大核心
2019年第10期61-66,共6页
Bulletin of Surveying and Mapping
基金
国家自然科学基金(41771397)
关键词
地表反射率
逐像元辐射归一化
混合像元分解
光谱库
HLS
surface reflectance
pixel-by-pixel radiometric normalization
mixed pixel decomposition
spectral library
HLS
作者简介
徐玉雯(1994—),女,硕士生,主要从事大气校正、辐射归一化方面的研究。E-mail:1277300408@qq.com;通信作者:张浩。E-mail:zhanghao612@radi.ac.cn。
