The TER3-PGS also showed a high
correlation with annual TEREC (r2 = 0.93). Furthermore, a sensitivity analysis showed that GPP3-PGS was highly sensitive
to the satellite greenness index (normalized difference of vegetation index) and to the vapor pressure deficit. With
general confidence in the models, we established a 30 year average meteorological grid of 8 km 8 km resolution
across Italy and created a map representing annual NEP3-PGS across Italian forests, based on the remotely sensed
CORINE Land Cover forest classification.