Minimize Level-2 Land LRR and LFR

The OLCI Level-2 land reduced or full resolution products, OL_2_LFR and OL_2_LRR respectively, are outputs from the OLCI Level-2 processor and contain land and atmospheric geophysical products at full and reduced resolutions.

The content of these files depends on several switches included in the OLCI configuration parameters. Each geophysical parameter format is only triggered if the corresponding switch is set to ‘1'. Note that all pixels flagged as cloudy are discarded from OLCI Level-2 processing.

The only difference between OL_2_LFR and OL_2_LRR products is the spatial resolution, with a spatial sampling of approximately 300 m for full resolution and 1.2 km for reduced resolution. The products are assumed to be computed in near real-time (i.e. delivered to users less than 3 hours after acquisition), in non-time critical (i.e. within 1 month after acquisition) or in re-processed non-time critical.

Each product provides as measurement data files (more fully described in the table below):

  • surface product as Global Vegetation Index (OGVI) and Terrestrial Chlorophyll Index (OTCI)
  • atmosphere by-products as Integrated Water Vapour (IWV) column (this product also contains information for water pixels and is identical to that included in OL_2_WRR and OL_2_WFR)
  • error estimates for all products.

Several associated variables are also provided in the annotations data files:

  • rectified reflectance for red and MIR channels (RC681 and RC865)
  • classification, quality and science flags (LQSF)
  • common data such as the ortho-geolocation of land pixels, solar and satellite angles, atmospheric and meteorological data, time stamp or instrument information. These variables are inherited from Level-1B products.
Variables Description Units Input Bands
OGVI Fraction of Absorbed Photosynthetically
Active Radiation (FAPAR) in the plant canopy
dimensionless Oa3, Oa10, Oa17
OTCI Estimates of the Chlorophyll content in terrestrial
vegetation, aims at monitoring vegetation condition and health
dimensionless -
IWV Total amount of water vapour integrated over
an atmosphere column
kg.m-2 Oa18, Oa19
RC681 and RC865 By-products of the OGVI, the so-called red
and NIR rectified reflectances, are virtual reflectance
largely decontaminated from atmospheric and
angular effects, and good proxy to Top of Canopy reflectances.
dimensionless Oa10, Oa17

Table 1: Description of land and atmospheric geophysical product

The classification, quality and science flags provide information about validity, suspicious quality, cosmetic filling, environment and input quality.