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遙感數(shù)據(jù)誤差對地表參數(shù)定量反演可靠性的影響-以太湖葉綠素a反演為例
摘要：地表參數(shù)的遙感反演誤差的大小由遙感數(shù)據(jù)誤差和反演模型誤差共同構(gòu)成,數(shù)據(jù)誤差不是簡單地加減到反演誤差中,而是經(jīng)過反演模型改造后融入到反演誤差中.因此,在地表參數(shù)定量反演過程中,用回歸系數(shù)最大或均方根誤差最佳代價(jià)函數(shù)來描述地表參數(shù)與遙感反射光譜之間的關(guān)系將不太可靠.從理論上指出了最高回歸系數(shù)或最小均方根誤差評(píng)價(jià)方法失效的根源在于反演模型的形式,以2003年10月27日太湖實(shí)測數(shù)據(jù)為例進(jìn)行了論證.研究表明,雖然TM2/TM3算法比TM2/TM1算法的回歸系數(shù)高,但其對數(shù)據(jù)誤差的放大效果是TM2/TM算法的2.28倍,這導(dǎo)致了反演結(jié)果的均方根誤差比TM2/TM1算法大了7.938 μg·L-1;另外從定量反演結(jié)果來看,基于TM2/17M3算法和基于TM2/17M1算法的反演結(jié)果完全相反,與以往研究成果對比可知,基于TM2/TM1算法的反演結(jié)果更符合實(shí)際.因此,數(shù)據(jù)誤差應(yīng)該作為一個(gè)約束條件,加入到代價(jià)函數(shù)的求解過程中,才能增加反演結(jié)果的可靠性.Abstract：The errors of the territorial parameters retrieved from remote sensing are decided by the data error and the model error.The data error is not simply added to the total errors of retrieval results.It would be reformed by the quantitative inversion model,and then,combined with the model errors and melts into the totals errors.Accordingly,during the quantitative process,taking advantage of the highest correlation coefficient or the least root mean square error as assessment standard for describing the chlorophyll a concentration vs remote sensing parameters is not reasonable.Focusing on the above problem,the study pointed out that the reason why the result of the optimized cost function is contrary with the practical is that different model has different influence on data errors.Combined with the in situ measurements of Taihu Lake,in October,2003,it is known that due to the error magnification phenomena (TM2/TM3 algorithm is 2.28 times more than TM2/TM1 algorithm),although the regression coefficient of TM2/TM3 algorithm is higher than TM2/TM1 algorithm,the quantitative errors of TM2/TM3 algorithm are 7.938 5 μg·L-1 more than TM2/TM1 algorithm.Moreover,the retrieval results show that distribution pattern of the resuits of TM2/TM3 algorithm is completely opposite to the TM2/TM1 algorithm.According to the former research achievements,the results of TM2/TM1 algorithm would be more reasonable.In summary,only when that the factor of data error is added to the optimized cost function is taken as a constrain condition in search for the optimal solution of the quantitative models,would the retrieval results be more reliable. 作者： 陳軍[1]周冠華[2]溫珍河[1]付軍[1] Author： CHEN Jun[1] ZHOU Guan-hua[2] WEN Zhen-he[1] FU Jun[1] 作者單位： 國土資源部海洋油氣資源與環(huán)境地質(zhì)重點(diǎn)實(shí)驗(yàn)室,山東,青島,266071;青島海洋地質(zhì)研究所,山東,青島,266071北京航空航天大學(xué)儀器科學(xué)與光電工程學(xué)院,北京,100191 期 刊： 光譜學(xué)與光譜分析 ISTICEISCIPKU Journal： SPECTROSCOPY AND SPECTRAL ANALYSIS 年，卷(期)： 2010, 30(5) 分類號(hào)： X87 關(guān)鍵詞： 數(shù)據(jù)誤差 定量遙感 代價(jià)函數(shù) 太湖 Keywords： Data error Quantitative remote sensing Cost function Taihu lake 機(jī)標(biāo)分類號(hào)： X82 TV2 機(jī)標(biāo)關(guān)鍵詞： 遙感 數(shù)據(jù)誤差 地表參數(shù) 定量反演 可靠性 太湖 葉綠素 Taihu Lake Case Study Errors quantitative errors 均方根誤差 data error 算法 results remote sensing cost function 回歸系數(shù) 反演誤差 基金項(xiàng)目： 國家科技支撐項(xiàng)目，國土資源大調(diào)查專項(xiàng)聯(lián)合項(xiàng)目【遙感數(shù)據(jù)誤差對地表參數(shù)定量反演可靠性的影響-以太湖葉綠素a反演為例】相關(guān)文章：
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