Fig. 2: Distribution of NDVI anomaly response types when using bent-cable regression.
From: Shifts in vegetation activity of terrestrial ecosystems attributable to climate trends
The frequency of cup-shaped (initial decrease, subsequent increase), hat-shaped (initial increase, subsequent decrease) and linear time trends in the anomalies in NDVI vegetation activity. The number of anomaly trends that showed an overall increase or decrease over the time series is indicated by different colours. Overall increases or decreases less than 2% in NDVI were classified as small. The response types were classified from bent-cable regression models fitted to the anomaly data from each site (for example, Fig. 1b). Similar results were found when using a polynomial regression model and EVI data (Extended Data Fig. 5).
