Three different SYN product grids have been defined.
The correspondence grids included in the Level-1 product are provided on the OLCI acquisition geometry.
The OLCI pixel resolution grid for each camera image (going from one to five) in its acquisition geometry. Note that we focus on full resolution grid (300 m).
The product grid for Level-2 atmospheric correction datasets is the OLCI image grid associated with the reference channel and defined in the Level-1B product.
Note that an OLCI sub-sampled grid is defined according to the tie-points included in OLCI and SLSTR Level-1B product. The VGK product is also projected on this rectangular and ortho-geolocated grid.
VGT continuity products are calculated for the same regular latitude-longitude sampling (equivalent to a plate-carrée projection) with a longitudinal sampling distance at the Equator of 1 km square. Pixel coordinates in this grid are illustrated in the figure below (green square).
Figure 1: SPOT VGT 1 km Plate-Carrée Grid Cell
The SYN AOD product is provided on a super-pixel grid, created from OLCI image pixel. Each super-pixel is combined from 15 by 15 OLCI 300m pixels. The resolution is then equal to 4.5 km ².