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題 名 | 埔里地區Landsat TM影像地形效應糾正之探討=Topographic Normalization of Landsat TM Image Over Pu-Li Area |
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作 者 | 黃凱易; 蘇婉霞; 李旻旻; | 書刊名 | 國立中興大學實驗林研究彙刊 |
卷 期 | 19:2 1997.09[民86.09] |
頁 次 | 頁77-87 |
分類號 | 436.718 |
關鍵詞 | 遙測; 地形效應; 數值地形模型; Remote sensing; Topographic effect; Digital terrain model; |
語 文 | 中文(Chinese) |
中文摘要 | 目前已有為數不少研究提出多種地形效應糾正方法,同時指明其方法可大幅降低 地形效應。惟大多數研究似乎僅應用在單一研究區,未探討是否適用其他區域及其條件。本 研究乃使用兩種前人用過之方法糾正地形效應,其目的係探討此二方法的潛在適用條件。第 一個方法係二階糾正法, 它將數值地模型 (DTM) 與 TM 影像套合,可大幅降低地形效應。 第二個方法由 DTM 建立暈渲模式, 並將其轉換為太陽角因子波段後與原 TM 影像結合為複 合影像。結果顯示兩種方法不但無法提高分類準確度,反而導致整體與個別分類準確度下降 。第一個方未發揮效用,不代表該法不適用,而有可能是季節、緯度、地形、資料解析度相 容性及軟體所用暈渲模式造成。第二個方法產生之新波段並非由感測器偵測地面反射值所得 之物理量, 久缺理論基礎,所以將其與 TM 像影結合為複合影像,實屬不當。 因此在利用 DTM 資料進行地形效應糾正時,應先就上述條件評估所用方法之適用性,不可盲目使用才是 。 |
英文摘要 | A number of studies have proposed a variety of techniques to correct the topographic effect currently. These studies also indicated that the proposed methods could reduce most of the topographic effect. However, most of the studies applied their techniques to only a site and never investigated their suitability to other sites with different conditions. The objective of this study was to identify the potential conditions of suitability by using two methods for correcting topographic effect proposed by previous studies. The first method, called two-stage correcting technique, required the use of a digital terrain model (DTM)registered to TM image data to reduce the topographic effect. The second method constructed a shaded relief model form DTM data and then converted it into a new band of sun angle. This band was combined with TM bands as a composite image. The results showed that these two methods could not improve classification accuracies; conversely, they caused the overall accuracy and individual accuracy to be reduced slightly. The first method could not work probably due to season, latitude, terrain, consistency in spatial resolution between TM image and DTM data, and the shaded relief model used by commerical software. The second method was inappropriate, since the measurements of new band were not generated from a sensor directly. Thus, the topographic normalization techniques through the use of DTM should not be used blindly before they have been evaluated in terms of conditions mentiond above. |
本系統中英文摘要資訊取自各篇刊載內容。