The SENTINEL-3 Ocean and Land Colour Instrument (OLCI) is based on the opto-mechanical and imaging design of Envisat's MERIS instrument. The main characteristics of the OLCI are:

• swath width: 1 270 km
• push-broom imaging spectrometer with five cameras, mitigation of sun-glint contamination by tilting cameras in westerly direction
• spatial sampling: 300 m @ SSP
• spectrum: 21 bands [0.4-1.02] µm
• radiometric accuracy: 2% abs, 0.1% rel
• launch mass: 153 kg
• size: 1.3 m³
• design lifetime: 7.5 years.

Figure 1: SENTINEL-3 OLCI Instrument (Credit: ESA)