Describes all auxiliary information that will be used by the Payload Data Ground Segment (PDGS) for the processing of MSI data. The auxiliary data required in MultiSpectral Instrument (MSI) data generation are:
The continuous acquisition of an image from one SENTINEL-2 satellite in a given MSI imaging mode is called a "datatake". The maximum length of an imaging datatake is 15,000 km (continuous observation from northern Russia to southern Africa).
Within a given datatake, a portion of image downlinked during a pass to a given station is termed a "datastrip". If a particular orbit is acquired by more than one station, a datatake is composed of one or more datastrips. It is expected that the maximum length of a datastrip downlinked to a ground station is approximately 5,000 km.
Granules and Tiles
A granule is the minimum indivisible partition of a product (containing all possible spectral bands).
A medium that accompanies the data and can be used to obtain information necessary to determine the suitability of a product for a certain use or application. Examples of quality indicators are: defective pixels mask, cloud masks, on-line quality control reports, etc.
There are three categories of timeliness defined for SENTINEL-2 operation:
True Colour Images (TCI)
Following the introduction of the Compact Naming Convention on the 6th of December 2016 (see the Sentinel-2 User Guide Product Naming Convention page for details), a TCI (True Colour Image) in JPEG2000 format is included within the Tile folder of Level-1C products in this format(1). The TCI is an RGB image built from the B02 (Blue), B03 (Green), and B04 (Red) Bands. The reflectances are coded between 1 and 255, 0 being reserved for 'No Data'. The saturation level of 255 digital counts correspond to a level of 3558 for L1C products or 2000 for L2A products (0.3558 and 0.2 in reflectance value respectively.