The quality of satellite images used for the generation of SST (Sea Surface Temperature) composites can be affected by the presence of undetected clouds or ice, or by an occasional malfunction of a satellite sensor. Temperature values computed over pixels exhibiting those imperfections then become incorrect.
Various levels of filtering are applied to images in order to remove bad pixel values, giving rise to various versions of the composites.
The stations included in the permanent thermograph network are selected through a process involving numerous consultations. The program aims to cover all coastal and offshore areas of the estuary and Gulf of St. Lawrence using a minimum of stations. Good spatial and temporal coverage should permit the creation of a climatology atlas for this zone while also meeting shorter-term needs for this type of data.