historic data availability
description
This indicator provides a measure of vegetation health by comparing current satellite-observed greenness to the historical range of values for the same period. It is a powerful tool for monitoring the health and productivity of ecosystems and agricultural lands. It is particularly effective at detecting and monitoring drought conditions, providing an early warning of potential impacts on crop yields and food security.
methodology
Calculates NDVI using Sentinel-2 data with cloud masking. Values are linearly interpolated to daily time-series, aggregated by median, and smoothed using a Savitzky-Golay filter. Standard deviation is calculated to characterize distribution. A negative 10m buffer is applied to large polygons to reduce adjacency effects
