查看“︁常態化差值植生指標”︁的源代码

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[[Image:Globalndvi tmo 200711 lrg.jpg|thumb|300px|Negative values of NDVI (values approaching -1) correspond to water. Values close to zero (-0.1 to 0.1) generally correspond to barren areas of rock, sand, or snow. Lastly, low, positive values represent shrub and grassland (approximately 0.2 to 0.4), while high values indicate temperate and tropical rainforests (values approaching 1).<ref>{{Cite web |url=http://earthobservatory.nasa.gov/Features/MeasuringVegetation/ |title=存档副本 |access-date=2015-03-24 |archive-date=2022-06-05 |archive-url=https://web.archive.org/web/20220605032919/https://earthobservatory.nasa.gov/features/MeasuringVegetation }}</ref>]]
[[Image:NDVI 062003.png|thumb|300px|right|NDVI in June over the British Isles (NOAA AVHRR)]]
[[Image:NDVI 102003.png|thumb|300px|right|NDVI in October over the British Isles (NOAA AVHRR)]]
'''歸一化植被指數'''（'''Normalized Difference Vegetation Index'''；'''NDVI'''）又譯'''标准化植被指数'''、'''常態化差值植生指標'''，是一個数值指標，通常（但不一定）是從太空來作觀測，用於分析遥感观测所得到的信息。NDVI通常是用卫星遥感数据计算，以評估目標地區綠色植被的生長状况。

計算方式是利用[[紅光]]與[[近紅外光]]的反射，能顯示出植物生長、[[生態系]]的活力與生產力等信息。數值愈大表示植物生長愈多。公式如下：

:<math>NDVI=\frac{(NIR-RED)}{(NIR+RED)}</math>

NIR為近紅外光反射；RED為紅光反射，NDVI之值介於-1到1之間。
當RED=0時，有最大值1；反之，當NIR=0時，有最小值-1。

==參考資料==
{{reflist}}

==參見==
*{{link-en|归一化差异水体指数|Normalized difference water index}}（NDWI）
*[[超頻影像]]
*[[物候學]]

==外部連結==
* [https://web.archive.org/web/20060427201736/http://noaasis.noaa.gov/NOAASIS/ml/avhrr.html Background on NOAA AVHRR]
* [http://earthobservatory.nasa.gov/Library/MeasuringVegetation/ Background on NDVI] {{Wayback|url=http://earthobservatory.nasa.gov/Library/MeasuringVegetation/ |date=20080917063748 }}
* [https://web.archive.org/web/20060510194120/http://www-gem.jrc.it/stars/vis.htm FAQ about vegetation indices]
* [https://web.archive.org/web/20060513023840/http://fapar.jrc.it/ FAPAR as a replacement for NDVI]
* [https://web.archive.org/web/20070304043130/http://www.ndvicentral.info/ NDVICentral]

[[Category:數值指標]]
[[分类:遥感]]