Minimize Processing Overview - Earth Observation Mode

OLCI Level-1 Earth Observation Processing

OLCI Level-1 Earth observation processing mainly involves calibrating the numerical counts contained in Instrument Source Packets (ISPs) into radiances, geo-locating acquired pixels on the Earth's surface and re-sampling the image onto an orthogonal product grid representing the instrument ideal swath. In addition, quality flags, meteorological annotations and pixel classification flags are computed and appended to the output Level-1B products.

This processing involves the following steps:

  1. Data extraction and quality checks.
  2. Radiometric scaling.
  3. Stray light correction.
  4. Georeferencing.
  5. Pixel classification functions.
  6. Spatial re-sampling.
  7. Product formatting (not described here).

Note: Since no Level-1A product is generated, the entire Earth observation processing is considered to be Level-1B (no specific Level-1A processing step is defined).

OLCI Level-1 Earth Observation Processing Top Level Breakdown

 

 

 

Abbreviation Full Name

IC

Instrument Characterisation

RC

Radiometric and spectral Calibration

DEM

Digital Elevation Model of the Earth's surface, assumed embedded in the mission software CFI

LWCM

 

Land/Water/Coastline Map

CT

bright and glint Classification Thresholds

MD

Meteorological Data

OF

Orbit File (source for time correlations but also for navigation in case NAVATT Level-0 is not available as input).