GF-1 WFV与Landsat-8 OLI和Sentinel-2A MSI遥感图像光谱信息转换研究

Conversion study on multi-spectral information of remote sensing images GF-1 WFV, Landsat-8 OLI and Sentinel-2A MSI

地表环境的宏观动态监测研究中,受卫星回归周期及天气的影响,单颗卫星难以获取长期、连续的光学遥感数据,因此,定量分析多平台遥感数据的光谱信息关系是十分必要的.本研究基于两组同日过境的无云卫星影像(GF-1与Landsat-8和Sentinel-2A),结合地面调查数据,进行了不同传感器影像间对应波段的光谱信息对比,并通过统计回归分析获得了两组卫星对应波段(蓝、绿、红和近红外)的反射率转换方程.研究结果显示,GF-1与Landsat-8和GF-1与Sentinel-2A对应波段的反射率都具有很强的相关性,得到的转换方程能够对上述三种卫星数据间对应波段的光谱信息实现高精度的转换.本研究能够实现同日多光谱遥感数据的光谱信息转换及协同应用,并为区域资源环境的长期定量遥感监测提供技术支持.

Owing to the restrictions in weather conditions and rev is it cycle o f satellites,single satellite can？t successively acquire effective opt ical RS data for long-term monitoring the ter res tr ial environments. Therefore, i t is crucial impor tant to analyze the multi-spectral informat ion of multi-source RS data. In this study, two groups of clear RS images （GF-1 and Landsat-8, GF-1 and Sentinel-2A）, in along wi th ground survey data, were respectively acquired on identical date. Four bands, blue, green, red and near infrared （NIR） , were selected to compare their spectral characteristics. At the same time, conversion equationfor reflectance of four corresponding spectral bands was derived respectively v ia s tat ist ical regression method. The result shows that each pair of bands in the two comparing groups has a strong correlation. And, these conversion equations can effectively converse spectral informat ion in between each band of two comparing groups wi th a bet ter precision. This study provides a useful technological approach for the identical date informat ion integration and syngeneic appl icat ion of multi-spec tral RS data from the same day, as well as quant itat ively monitoring the long-term dynamics in environments and resources at regional scale.