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Data Visualization
Unit
The vegetation productivity index is a dimensionless measure. It is calculated as the integral value of the yearly vegetation index. Hence, digital values indicate the approximated productivity of the land surface vegetation.
Methodology
The indicator addresses trends in land surface productivity derived from remote sensing observed time series of vegetation indices between 2000-2016. The vegetation index used in the indicator is the Plant Phenology Index (PPI, Jin and Eklundh, 2014). PPI is based on the MODIS Nadir BRDF-Adjusted Reflectance product (MODIS MCD43 NBAR. The product provides reflectance data for the MODIS “land” bands (1 - 7) adjusted using a bi-directional reflectance distribution function. This function models values as if they were collected from a nadir-view to remove so called cross-track illumination effects. The product is distributed with 500 m pixel size (MODIS Sinusoidal Grid) with 8-days compositing period. The web map service was derived from a 16 bit time series.
For references, please go to https://www.eea.europa.eu/data-and-maps/daviz/climatic-drivers-of-productivity-dynamics or scan the QR code.
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