Journal of Remote Sensing / 2021 / Article / Fig 2

Review Article

Mapping Crop Phenology in Near Real-Time Using Satellite Remote Sensing: Challenges and Opportunities

Figure 2

A diagram of NDVI (v(t)), EMA, MACD terms, and momentums shows the (a) greenup event and emergence and (b) senescence, dormancy, and the termination operation using VENμS time series (modified from Gao et al. [35, 41]). In addition to the MACD threshold, the trend-based approaches use the upward or downward momentums (blue-shaded areas) and VI amplitude to determine greenup and senescence events.