海岸带高光谱遥感与近海高光谱成像仪(HICO)

应海岸带监测需求,高光谱成像仪开始在海岸带监测中发挥重要作用。搭载于国际空间站上的HICO(Hyperspectral Imager for the Coastal Ocean)是第一颗针对近岸海洋遥感的高光谱成像仪,其波谱范围为360～1 080 nm,光谱分辨率为5 nm。介绍了HICO数据的基本情况,并与在轨星载高光谱成像仪EO-1 Hyperion和HJ-1A HSI基本参数做了对比。同时针对高浑浊水体,以黄河三角洲近岸3种典型地物为例,结合FLAASH大气校正模型,提取了辐亮度和地表反射率,初步对比分析了HICO和HSI的光谱性能。结果表明HICO能更好地反映近岸地物的光谱特征。

Hyperspectral Remote Sensing for Coastal Zone and Hyperspectral Imager for the Coastal Ocean

HICO (Hyperspectral Imager for the Coastal Ocean) is the first hyperspectal imager on board International Space Station (ISS),and it is specially designed for coastal ocean remote sensing.In this paper,main characteristics of HICO are introduced and compared with another two on-orbit hyperspectral imager:EO-1 Hyperion,HJ-1A HyperSpectral Imager.In the case of turbid water environment of the Yellow River Delta,three typical kinds of objects are selected for comparasion of their radicane and ground reflectance after the atmospheric correction with FLAASH (Fast Line of Sight Atmospheric Analysis of Spectral Hypercubes).Results show that HICO’s spectrum curves are smooth and consistant with in-situ measured spectra,while HSI’s fluctuate strongly,particularly in blue bands.Water retrieval using ~820 nm band in atmospheric correction distinctly improves the reflectance accuracy around absorption band of water vapour.On the whole,HICO has better performance than HSI in delivering the spectral characteristics of objects in coastal zone.