The remotely sensed Normalized Difference Vegetation Index, or NDVI, is being used operationally to evaluate rainfall and vegetation growth. It shows a good relationship to these variables in relatively dry locations, but the index saturates under humid conditions. Over much of Africa, the saturation takes place where annual rainfall is on the order of1000 to 1200 mm. Above this threshold, NDVI cannot be used with any degree of confidence to assess either rainfall or vegetation.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- On the Use of the Normalized Difference Vegetation Index as an Indicator of Rainfall
Sharon E. Nicholson
- Springer Berlin Heidelberg