透過您的圖書館登入
IP:3.144.42.196
  • 學位論文

以多期遙測衛星影像偵測林地覆蓋變異

Detection of Forest Land Cover Changes Using Multi-temporal Satellite Images

指導教授 : 陳朝圳 陳建璋

摘要


林地覆蓋變異(Forest Land Cover Changes, FLCC)產生之原因,包括崩塌、風災所造成之變異及林地違規開發使用之變異,FLCC不但影響森林的生態服務功能,亦影響林區管理之行政工作,因此有效掌握轄區之FLCC,為森林經營管理之重要工作。本研究利用多期衛星影像之波譜反射特性,探討遙測影像之前期處理對FLCC分析之影響;利用不同影像變異演算法,探討其對FLCC分析準確度之差異性;建立多期衛星影像之FLCC之作業流程,以利於有效的林地非法使用監測。在影像前期處理方面,本研究探討幾何糾正及輻射糾正對FLCC分析之準確度影響,結果顯示影像前期處理對於FLCC萃取之準確度雖然提升有限,但為FLCC分析之必要過程;利用常態化差值植生指標差值法(Difference Normalized Difference Vegetation Index, dNDVI)、主成份分析法(Principal Component Analysis, PCA) 、光譜變化向量分析(Spectral Change Vector Analysis, SCVA)及寫入儲存插入法(Write Function Memory Insertion,WFM),四種影像變異分析演算法以及兩種影像空間解析力(2 m融合影像、8 m多光譜影像),進行FLCC分析,並比較變異演算方法及不同影像空間解析力,對FLCC分析之準確度影響,結果顯示dNDVI 演算法準確度最高,且具有較佳的穩定性,而在空間解析力方面,由於椒鹽效應會造成8 m多光譜影像對於FLCC偵測準確度較2 m融合影像為佳。為區隔變異點所造成的原因,本研究以非監督分類法配合林地違規開發之行為模式,進行變異點的分類,結果顯示變異點依dNDVI值的高低分為5群其準確性最高。林地違規使用所產生之變異點,可依據農墾地之開發行為模式,設立篩選門檻值,利用研究區之相關的地理空間資訊,去除非人為因素所造成之FLCC,其結果有助於林政業務之應用。

關鍵字

多期影像 變異偵測 土地覆蓋 dNDVI GIS

並列摘要


Forest Land Cover Changes (FLCC) caused by landslide, typhoon or human-induced that affected the ecosystem services and forest management policy. How to efficiently get FLCC information is an important task for forest management. In this study, we use the spectral characteristics of multi-temporal satellite images to investigate the accuracy of FLCC analysis with image pro processing and different change detection algorithm; using multi-temporal satellite images to build the FLCC processes and to monitor the illegal forest landuse. In the pro processing of image, this study investigated the effects of geometric and radiation correction for FLCC analysis, results showed that the pro processing is limit to increase the accuracy of FLCC analysis, meanwhile that is a necessary process for FLCC analysis. Four change detection algorithms (dNDVI, PCA, SCVA, and WFM) will be used to compare the accuracy of FLCC analysis; results showed that the dNDVI has higher accuracy and stable than other algorithm. We integrate the illegal model of forest landuse and use unsupervised classification to classify the cause of FLCC; results showed that has a higher accuracy by the value of dNDVI to divide into five categories. FLCC caused by the illegal forest landuse, can be based on monitoring purposes to establish the threshold of illegal using model by geographic information system, and removal the non-human factors of FLCC, results will help to forest administration.

參考文獻


鄧淑萍 (2010) 假設檢定及衛星遙測影像應用於地表覆蓋變遷偵測之研究。國立臺灣大學生物資源暨農學院森林環境暨資源學系博士論文,122頁。
朱容君、馮郁筑、陳朝圳 (2007) 墾丁國家公園銀合歡植生綠度之季節性變化。華岡農科學報 20: 53-62。
蔡博文 (2005) 土地變遷研究之回顧與展望。全球變遷通訊雜48: 4。
林恩如、劉正千、張智華、鄭依凡、柯明勳 (2013) 運用福衛二號高時空分辨率多光譜影像於臺灣全島崩塌地判釋與災害分析。航測及遙測學刊17(1): 31-51。
王瑞源、徐逸祥、陳依婕、樊先達、黃昭雄、朱子豪 (2011) 整合空間及遙測分析於非法廢棄物棄置場之判釋。航測及遙測學刊16(1): 45-61

延伸閱讀