Minimize Level-1B Processing Overview

Level-1B processing permits the generation of a Level-1B product (TOA calibrated radiance) from a Level-1A product (TOA radiance). It includes:

  • radiometric corrections
  • refinement of the physical geometrical viewing model (which is not applied at this level)

Figure 1: Level-1B Processing Overview

  • Level-1B Radiometric Processing includes dark signal correction, pixel response non-uniformity correction, crosstalk correction, defective pixels identification, high spatial resolution bands restoration (deconvolution and denoising) and the binning of the 60 m spectral bands.
  • Common Geometry Grid Computation for Image-GRI Registration defines the common monolithic geometry in which the Global Reference Images (GRI) and the reference band of the image to refine shall be resampled.
  • Respampling on Common Geometry Grid for Image-GRI Registration performs the resampling on the common geometry grid for the registration between the GRI and the reference band.
  • Tie-Points Collection for Image-GRI Registration includes the collection of the tie-points from the two images for the registration between the GRI and the reference band.
  • Tie-Points Filtering for Image-GRI Registration performs a filtering of the tie-points over several areas (sub-scenes) and a given number of trusted tie-points is required for each subscene.
  • Spatiotriangulation for Image-GRI Registration refines the viewing model using the initialized viewing model and the set of Ground Control Points (GCPs) from previous steps. The output refined model ensures the registration between the GRI and the reference band.
  • Level-1B Compression compresses Level-1B imagery using the JPEG2000 algorithm. The Kakadu software library is used for the JP2K compression of product images.


Optional Steps in VNIR-SWIR Registration Processing:


The applicability of the following optional steps will be decided at commissioning.

  • Common Geometry Grid Computation for VNIR-SWIR Registration defines the common geometry in which the registration will be performed.
  • Respampling on Common Geometry Grid for VNIR-SWIR Registration performs the resampling on the common geometry grid for the registration between VNIR and SWIR bands.
  • Tie-Points Collection for VNIR-SWIR Registration includes the collection of the tie-points from the two images for the refinement of the registration between VNIR and SWIR focal planes.
  • Tie-Points Filtering for VNIR-SWIR Registration performs a filtering of the tie-points over several areas (sub-scenes) and a given number of trusted tie-points are required for each subscene.
  • Spatiotriangulation for VNIR-SWIR Registration 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.