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題 名 | 應用SPOT衛星影像區分水稻旱害等級與受災範圍之初步研究=Analysis of Degree and Extent of Drought Stress to Rice Using SPOT Images |
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作 者 | 申雍; 李佩玲; | 書刊名 | 中華農業氣象 |
卷 期 | 5:4 1998.10[民87.10] |
頁 次 | 頁203-208 |
分類號 | 434.111 |
關鍵詞 | 水稻; 旱害; 逆境; 遙測; Rice; Drought; Stress; Remote sensing; |
語 文 | 中文(Chinese) |
中文摘要 | 民國八十二年十月底,臺中縣沿海地區水稻受乾旱成災,本研究即以該地區水稻 為研究對象,探討利用衛星遙測方法鑑別水稻遭受旱害等級與受災範圍之可行性。不同受災 等級水稻植冠反射光譜測量結果顯示,當水分供應受到限制,將使得水稻植冠近紅外光段之 反射率降低,可見光段反射率升高,植被指數 NDVI 與 SRVI 則隨旱害程度之增強而下降。 研究中取 SPOT 衛星影像利用植被指數 NDVI 與 SRVI 進行受災等級與分佈範圍之劃分,並 與現地調查資料比對。分析結果指出應用衛星影像分析較目視易於區分水稻遭受旱害的等級 與分佈區域,且不易受人為因素干擾。但是若要利用衛星影像評估每一地號田區的受災等級 ,則目前 SPOT 衛星的空間解析度仍嫌不足。此外,地真基本資料的累積在分析衛星影像時 也是不可或缺的。 |
英文摘要 | Rice growth was severely damaged by drought at end of October 1993 in coastal area of Taichung county. The feasibility of using remotely sensed satellite data to evaluate the degree and extent of drought stress to rice in the area were explored in this study. Reflectance spectrum measurement of various drought-stressed rice canopies indicated a trend of decreasing in near infrared but increasing in visible band. Vegetation indices, SRVI and NDVI, of stressed rice canopies were decreased accordingly. In this study, the degree and extent of stressed rice were analyzed using SPOT images through classification categories defined using SRVI and NDVI indices and compared with field survey data. Results indicated that, in terms of the sensitivity and flexibility, analyzing SPOT images was better than field survey in identifying the degree and extent of drought stress. However, at the present time, the spatial resolution of SPOT images was not finer enough to distinguish the stress level of a particular field. Besides, collection of ground truth data will play an indispensable role in satellite image analysis. |
本系統中英文摘要資訊取自各篇刊載內容。