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題 名 | 植生指數在集水區內的地文分佈研究=Geomorphologic Distribution of Normalized Difference Vegetation Index(NDVI) in Watersheds |
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作 者 | 劉治中; 蕭國鑫; | 書刊名 | 航測及遙測學刊 |
卷 期 | 4:4 1999.12[民88.12] |
頁 次 | 頁39-53 |
分類號 | 436.718 |
關鍵詞 | 植生指數; 地形效應; 地文因子; Normalized difference vegetation index; Topographic effect; Geomorphologic factor; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以福山、七家灣、三地門及立山四隻水區的Landsat TM及DTM資料,利用Minnaert 方法修正原始遙測資料的地形效應後,計算NDVI值,研究其因坡度、坡向、高程、累積流量及地形指數等地文因子引起的地理分佈變化,結果顯示坡向強烈影響NDVE分佈,高NDVI值像元較集中於東南方,而且可分成向陽及背陽區,坡度之影響較不明顯,但四區皆顯示30∼40坡度有最大NDVI值,在低高程區NDVI隨高程而漸增,而相對高海拔區NDVI因高程而漸減,可能與河谷位置或溫度變化有關,累積流變為像元在坡面位置的指標,四集水區的NDVI都沿坡面位置漸往下坡面而減少,地形指數與土壤表層濕度有關,結果顯示在地形指數大於零的情形下,NDVI 隨地形指數增加而漸減少。 |
英文摘要 | Landsat TM data in Fusan, Chichiawan, Sandiman and Lisan watersheds are sued to study the affection of geomorphologic factors (aspect, slope, elevation, flow accumulation, topographic index) to the geographic distribution of normalized difference vegetation index (NDVI). Raw Landsat TM data are corrected by Minnaert model to mitigate topographic effect. Geomorphologic factors are calculated by Digital Terrain Model. Results show that aspect strongly affect distribution of NDVI. High NDVI pixels appear on south-east aspect. Slpes can be divided into of illuminate and non-illuminate side. Slope angle has comparative low affection to NDVI, but all the data show a peak value in 30∼40.NDVI increase with elevation in low altitude area, and decrees with elevation in the area higher than 3,000m. Flow accumulation (FAC) value indicating pixel position is either near ridge or bottomland. It helps to find a fact that highest NDVI is on ridge pixel and tehm decrees toward bottomland along a slope. The topographic index is believed to relate to topsoil moisture content. NDVI are decrees with topographic index in all basins in positive index case. |
本系統中英文摘要資訊取自各篇刊載內容。