The concentration of phytoplankton pigments can be estimated with spaceborne sensors using the Ocean Colour Radiometry Technology (OCR). OCR is currently the only means to obtain quasi-daily synoptic maps of the biological state of the coastal and open ocean. Other water quality parameters can also be assessed from OCR if appropriate data processing methods are used. Total suspended matter, dissolved and detrital organic material, water turbidity or transparency and phytoplankton pigments are a few examples of water quality indicators that are accessible from space. The Sea Surface Temperature (SST) of the water bodies can be monitored from space using radiometric measurements at the thermal infrared wavelengths. For decades SST images have been routinely used in parallel with OCR datasets for a better understanding of the ecosystem dynamics.