A Method to Reconstruct Surface Reflectance Spectrum from Multispectral Image Based on Canopy Radiation Transfer Model
ZHAO Yong-guang1, 2, MA Ling-ling1*, LI Chuan-rong1, ZHU Xiao-hua1, TANG Ling-li1
1. Key Laboratory of Quantitative Remote Sensing Information Technology, Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：Due to the lack of enough spectral bands for multi-spectral sensor, it is difficult to reconstruct surface reflectance spectrum from finite spectral information acquired by multi-spectral instrument. Here, taking into full account of the heterogeneity of pixel from remote sensing image, a method is proposed to simulate hyperspectral data from multispectral data based on canopy radiation transfer model. This method first assumes the mixed pixels contain two types of land cover, i. e. vegetation and soil. The sensitive parameters of Soil-Leaf-Canopy (SLC) model and a soil ratio factor were retrieved from multi-spectral data based on Look-Up Table (LUT) technology. Then, by combined with a soil ratio factor, all the parameters were input into the SLC model to simulate the surface reflectance spectrum from 400 to 2 400 nm. Taking Landsat Enhanced Thematic Mapper Plus (ETM+) image as reference image, the surface reflectance spectrum was simulated. The simulated reflectance spectrum revealed different feature information of different surface types. To test the performance of this method, the simulated reflectance spectrum was convolved with the Landsat ETM+ spectral response curves and Moderate Resolution Imaging Spectrometer (MODIS) spectral response curves to obtain the simulated Landsat ETM+ and MODIS image. Finally, the simulated Landsat ETM+ and MODIS images were compared with the observed Landsat ETM+ and MODIS images. The results generally showed high correction coefficients (Landsat: 0.90~0.99, MODIS: 0.74~0.85) between most simulated bands and observed bands and indicated that the simulated reflectance spectrum was well simulated and reliable.
Key words：Multispectral data;Surface reflectance;Image simulation;SLC model
赵永光1, 2，马灵玲1*，李传荣1，朱小华1，唐伶俐1. 基于冠层辐射传输模型的地表反射率光谱重建方法[J]. 光谱学与光谱分析, 2015, 35(07): 1763-1769.
ZHAO Yong-guang1, 2, MA Ling-ling1*, LI Chuan-rong1, ZHU Xiao-hua1, TANG Ling-li1. A Method to Reconstruct Surface Reflectance Spectrum from Multispectral Image Based on Canopy Radiation Transfer Model. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(07): 1763-1769.
