Compositing to generate S1 and S10 products

Both daily and ten-day composites (S1 and S10 respectively) are produced from surface reflectance included in the VGK products, taking the NDVI previously computed during VGT-P processing into account.

The compositing is carried out on the VGT 1 km Plate-Carrée grid (see Projection to Generate P Products). The pixels incorporated into the synthesis are selected according several rules checking the cloudiness, the quality of radiometric measurements, the angles, …. Once this priori filtering has been done, a maximum NDVI value selection is performed, in order to ensure coverage of all landmasses worldwide with the minimum effect of cloud cover.

This composite method has been derived from PROBA-V algorithm to ensure continuity to VGT and Proba-V service.

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