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題名 | 衛星影像地形效應糾正方法適用性之探討=The Suitability of Topographic Normalization Techniques for Satellite Imagery |
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作者 | 黃凱易; 施勝誠; Huang, Kai-yi; Shih, Sheng-cheng; |
期刊 | 國立中興大學實驗林研究彙刊 |
出版日期 | 19980300 |
卷期 | 20:1 1998.03[民87.03] |
頁次 | 頁17-36 |
分類號 | 436.718 |
語文 | chi |
關鍵詞 | 遙測; 地形效應; 數值地形模型; Remote sensing; Topographic effect; Digital terrain model; |
中文摘要 | 本研究仍使用兩種前人用過之方法分別對三幅不同地區不同季節怕攝的Landsat TM影像作地形效應糾正,其目的係探討此二方法對不同影像條件的適用範圍及其限制。第 一個方法為二階糾正法,它將數值地形模型(Digital Terrain Model,DTM)與TM影像套合, 用以降低地形效應。第二個方法為向輻射變換糾正法(Backward Radiance Correction Transormation),其方法係基於非全漫射假說模式(Non-Lambertian Assumption),並 使用k常數(Minnaert Constant)對全區影像作糾正運算,進而達到地形效應糾正的目地 。本研究結果發現在糾正效果上二階糾正法與逆向輻射變換糾正法雖可消減部分地形效應 但均有其限制條件。二者共同之限制為季節與緯度會影響太陽高度角及方位角使得夏季影 像之糾正效果優於各季影像。地形效應之大小也與波長相關,TM紅外光波段需要較大之糾 正,兩種方法對可見光波長糾正之效果比紅外光好。二階糾正法較適用於試區內地覆均質 性較高的地區,對於試區內地覆雜異性高之區域則很難獲得較佳之糾正效果。逆向輻射變 換糾正法除了同樣有前述之共同限制外,尚有陰影區在糾正時數學運算上之限制,若受限 制之像元數太多持陰影區之光譜資訊將嚴重減少,無法達到預期之糾正結果。後續研究係 對兩種方 k糾正後之影像進行分類準確度評估,以客觀評估兩種方法。尤有甚者,應使用 新近發展方法或發展新糾正方法才是。 |
英文摘要 | The objective of this study was to identify the potential conditions of suitability using two methods for correcting topographic effect proposed by pre- vious studies. The first method,called two0stage correcting technique, requires the use of a digital terrain model(DTM)registered to TM image data to reduce the topographic effect.The second method,called backward radiance correction tr- ansformation(BRCT),utilizes a Minnaert constant based on a non-Lambertian assumption to normalize the topographic effect of the TM imagery.The results indicated that both of two methods had their own limitations although they could partly alleviate the topographic effect.Their common limitations were the season and latitude of the images affecting solar elevation angles and azimuth angles. Consequently, the effectiveness of topographic normalization using both methods was better for summer season than that for winter season. The magnitude of the topographic effect was also spectrally dependent, with greater corrections being required for the TM infrared bands. The corrected results for visible bands were better than those for infrared bands. The two-stage correcting technique was better suited for an area with homogeneous land cover than an area with heterogeneous land cover.In addition to the limitations mentioned above,the BRCT was subject to another mathematical limitation when correcting pixels in the shadowed area. The BRCT failed frequently to correct the topographic effect under this limitation in winter.Follow-up studies will conduct the classification accuracy assessment for the topographically normalized images using both techniques to compare one with the other objectively.Of more concern is to use correction techniques being developed recently or to develop new ones. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。