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Spectral consistency with SPOT-VEGETATION is an important mission objective for PROBA-V, in particular for its 1 km products.This must allow service providers such as the Copernicus Global Land Service to extend the 16-year long timeseries of SPOTVEGETATIONglobal 1km data with similar PROBA-V products. To evaluate the extent of spectral consistency, an evaluation ofspectral response differences is performed by applying the spectral response of PROBA-V and SPOT-VEGETATION 2 to a spectrallibrary of representative global land cover conditions. Datasets for surface reflectance values and Normalized Difference VegetationIndex (NDVI) are thus established for both missions. Through linear regression between the two datasets, spectral correctionfunctions are defined, which can be used to improve the spectral consistency between PROBA-V and SPOT-VEGETATIONproducts. The correspondence between PROBA-V and SPOT-VEGETATION products is then evaluated for the overlapping periodwhen products from both missions were available. The effect of the spectral correction functions is assessed by comparing thecorrespondence obtained with and without this spectral correction applied. For the NDVI product, an additional offset correction isdefined based on a limited sample of the overlapping period. The final spectral correction functions are then evaluated over the fulloverlapping period between PROBA-V and SPOT-VEGETATION. Discrepancies are observed which indicate a temporal behaviorwith respect to the correspondence of the mission products. Such temporal behavior can’t be explained by spectral responsedifferences, and therefore other causes are investigated

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Validation of spectral continuity between PROBA-V and SPOT-VEGETATION global daily datasets