Products and algorithms
There are different data products associated with the three levels of processing of altimeter data.
The Level-1 scientific products (SR_1_SRA) and Level-2 scientific products (both water SR_2_WAT and land SR_2_LAN) are available to users. The Level-0 scientific products (SR_0_SRA), the SRAL calibration products (SR_0_CAL and SR_1_CAL) and the MWR products (MW_0_MWR, MW_1_MWR and MW_1_CAL), are not available to users and are considered only as an input to processing chains.
Figure 1: SRAL/MWR product tree (Credit: CLS)
In the Level-2 processing chain, there are three main processing steps : Compute time-derived geophysical/environmental parameters, perform re-tracking and compute physical parameters, and compute Level-2 altimeter/radiometer geophysical processing.