GSC Sentinel-2 PDGS OCD - Emits - ESA

GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 138 of 350
two images for the refinement of the registration between VNIR and SWIR focal
planes. The VNIR-SWIR registration is optional and applicability will be decided at
commissioning.
o Tie Points Filtering for VNIR-SWIR Registration (performed within the GPP by the
Geo_S2 IAS). This processing step performs a filtering of the tie points over several
areas (sub-scenes) and a given number of trusty tie points are required for each subscene.
The VNIR-SWIR registration processing is optional and applicability will be
decided at commissioning.
o Spatiotriangulation for VNIR-SWIR Registration (performed within the GPP by the
Geo_S2 IAS). This processing step refines the viewing model using the initialized
viewing model and the set of ground control points from previous steps. The output of
this step is a refined viewing model ensuring the registration between VNIR and SWIR
focal planes. The VNIR-SWIR registration processing is optional and applicability will
be decided at commissioning.
o Level-1B Compression (performed within the GPP by the JP2KCompression IAS).
This processing step compresses Level-1B imagery using JPEG2000 algorithm.
Level-1C Processing
o Level-1C Tiles Association (performed within the GPP by the Tiling_S2 module of
the Resample_S2 IAS). This module selects pre-defined tiles which intersect the
image footprint.
o Level-1C Resampling Grid Computation (performed within the GPP by Phases 1 to
7 of the Resample_S2 IAS). This processing step calculates the resampling grids,
linking the image in native geometry to the target geometry (ortho-image).
o Resampling on Level-1C Geometry (performed within the GPP by Phase 8 of the
Resample_S2 IAS). This processing step resamples each spectral band in the
geometry of the ortho-image using the resampling grids and an interpolation filter. In
addition, it calculates the TOA reflectances.
o Masks Computation (performed within the GPP by the Mask_S2 IAS). This step
generates the cloud and land/water masks at Level-1C geometry.
o Level-1C Compression (performed within the GPP by the JP2KCompression IAS).
This processing step compresses Level-1C imagery using JPEG2000 algorithm and a
GML geographic imagery encoded header. Level-1C data is output at the term of this
step.
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