基于ETM+的表观荔枝波谱反射率反演研究

A RESEARCH ON RETRIEVING THE APPARENT REFLECTANCE OF LICHEE SPECTRUM BASED ON ETM+ IMAGE

试从现有的大量遥感影像中提取不同环境下地物的反射率,以目前常用的ETM+影像数据和荔枝波谱数据提取为例,先对影像进行系统校正得到星上反射率,然后采用6S大气校正模型对图像进行订正,反演地物的真实反射率,并采用与野外实测相结合的方法,分析了星上反射率、6S反演的反射率与实测值之间的误差,结果证明6S校正法是一种较高精度的地物波谱反演方法,可以方便、快捷、准确地从现有的大量遥感影像上直接获取荔枝的反射率。为下一步的自动高效从影像反演地物反射率的研究奠定了基础。

Although the development of spectral library is always an important research aspect of remote sensing at home and abroad, nowadays, most object spectrum data still depend on field measurement, which consumes a great lot of manpower and material resources. It is especially important to obtain object reflectance under deferent environment conditions from the present vast remote sensing images. A study is made on liehee reflectance inversion with ETM＋ image. First, system emendation is conducted on the image to obtain APR; second, the atmospheric correction of ETM＋ image is carried out with 6S model which is an operational method of correcting visible and near-infrared data for atmospheric effects; finally, error analysis is made by comparison between APR, corrected ETM＋ image data from 6S model and measured reflectance data of field. It is proved that 6S is a higher precision way to retrieve spectrum of lichee object. The method provides convenience for lichee remote sensing research based on apparent reflectance retrieval from remote sensing images.