环境一号卫星高光谱遥感数据的内陆水质监测适宜性——以巢湖为例

摘要

环境一号星座的A星(HJ-1A)上搭载了超光谱成像仪(HSI),它是具有高光谱分辨率的全新国产遥感数据源,为水质遥感特别是内陆水质遥感提供了新的高光谱数据.但HSI影像的处理方法尚不完善,在广泛应用于水质遥感前对其进行质量研究和评价非常必要.本文针对HSI数据在巢湖水质监测应用方面的适宜性,对信噪比和数据真实性、倾斜条纹去除方法、大气校正方法等方面分别进行了评价.结果表明,HSI水体图像在530 - 900 nm波段范围内数据质量较为真实可靠；6S与FLAASH方法均能有效去除大气效应,在530 - 830 nm范围内效果较好.%The hyperepectral imager( HIS) is loaded on the HJ-1A satellite, which is a new source of home-made data with high spectral resolution and provides new remote sensing data for water quality, especially for lake water quality monitoring. Because the processing method of HIS images is underdeveloped, the quality evaluation and research for HIS images are necessary before it is extensively used in water-quality remote sensing. Suitability of lake water quality monitoring in Lake Chaohu by HIS image is assessed via data verifying, signal-to-noise computing, stripes removing and atmospheric correcting. The results show that HIS data of waterbody is reliable between wave bands 530 - 900 nm. Both 6S and FLAASH algorithm works well in atmospheric correction of HIS data, and the best range is at the 530-830 nm.