GIMMS FPAR4g, a global dataset of the fraction of absorbed photosynthetically active radiation for 1982—2022

The fourth generation of the GIMMS FPAR dataset (GIMMS FPAR4g, version 1.0) offers a temporal resolution of half a month and a spatial resolution of 1/12°, spanning from 1982 to 2022. It was developed based on the PKU GIMMS NDVI that eliminates the orbital drift and sensor degradation issues and high-quality Sensor-Independent FPAR using a combination of a machine learning algorithm and a pixel-wise multi-sensor records integration approach. We have created a separate file in GeoTIFF format for each scene. There are 24 scenes for each year, each of which represents FPAR for half a month. Each scene is associated with a quality control layer inherited from PKU GIMMS NDVI (version: solely). Additionally, we provide global images showcasing the correlation coefficient and RMSE of the pixel-wise regression models for data users. The FPAR4g solely dataset (1982—2015) which has not been calibrated with SI FPAR is also stored in the same repository. It is strongly recommended that users of the GIMMS FPAR4g product read the Readme file before use to ensure proper handling of the fill values and QC flags within the dataset.