本文關鍵詞：基于Freeman分解的喀斯特高原山區(qū)煙田土壤水分反演研究　出處：《地理與地理信息科學》2016年02期 　論文類型：期刊論文

  更多相關文章： 喀斯特高原山區(qū) 土壤水分反演 Freeman-Durden分解 Radarsat- 煙田

【摘要】：為探究SAR技術在喀斯特高原山區(qū)煙田旱情監(jiān)測,選取貴州省清鎮(zhèn)市流長鄉(xiāng)現代烤煙農業(yè)基地單元為研究區(qū),采用SAR目標極化分解技術反演團棵期煙田土壤水分。選取Radarsat-2全極化數據,通過Freeman-Durden極化目標分解技術,分解出3種散射機制,并從目視解譯假彩色合成影像與散射功率兩個角度綜合分析主要散射機制,根據SAR影像散射量中的介電常數與土壤水分密切相關的原理,嘗試不同的回歸模型,用主要散射機制占比反演煙田土壤水分,并用線性回歸檢驗法檢驗其反演精度。結果表明:此方法能夠較好地反演喀斯特高原山區(qū)煙田團棵期土壤水分,體現出SAR影像信息中單次散射模擬微粗糙表面散射及反演土壤水分的優(yōu)勢,為喀斯特高原山區(qū)煙田旱情監(jiān)測提供技術參考。
[Abstract]:In order to investigate the drought monitoring of tobacco field in karst plateau mountain area with SAR technology, the unit of modern flue-cured tobacco agricultural base in Liuchang Township, Qingzhen City, Guizhou Province was selected as the research area. The soil moisture of tobacco field in cluster stage was retrieved by SAR target polarization decomposition technique. Radarsat-2 full polarization data was selected and Freeman-Durden polarization target decomposition technique was adopted. Three scattering mechanisms were decomposed, and the main scattering mechanisms were analyzed from the angle of visual interpretation of pseudocolor composite image and scattering power. According to the principle that the dielectric constant in the scattering amount of SAR image is closely related to soil moisture, different regression models are tried, and the main scattering mechanism is used to retrieve soil moisture in tobacco field. The accuracy of the inversion is tested by linear regression test. The results show that the method can be used to retrieve soil moisture of tobacco field in karst plateau. It shows the advantage of simulating micro-rough surface scattering and retrieving soil moisture in SAR image information, and provides a technical reference for monitoring the drought of tobacco field in the mountainous area of Karst Plateau.
【作者單位】： 貴州師范大學喀斯特研究院;貴州省遙感中心;
【基金】：國家重點基礎研究發(fā)展計劃(973計劃)課題“人為干預下喀斯特山地石漠化的演變機制與調控”(2012CB723202) 貴州省科技計劃“喀斯特山區(qū)SAR遙感平臺監(jiān)測與識別關鍵技術研究與應用”(黔科合GY字〔2013〕3062) 貴州省重大應用基礎研究項目“喀斯特石漠化生態(tài)修復及生態(tài)經濟系統(tǒng)優(yōu)化調控研究-巖土類型格局”(黔科合JZ字[2014]200201)
【分類號】：S152.7;S572
【正文快照】： 0引言地表土壤水分的時空分布信息在水文學、氣候學、植物生態(tài)學等學科中有著重要地位,同時也在預報旱情、估算農作物產量等方面起到重要作用[1]�？緹熓俏覈匾慕洕魑镏�,提高烤煙種植的精準度,已成為現代烤煙農業(yè)發(fā)展的需要[2]。土壤水分是烤煙生長發(fā)育過程中生理需水

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