Left: full resolution (1 km) AATSR SST image from previous project. Clouds over the ocean are rendered on a grey scale, and the green feature is land. The rendering of temperature is such that the coolest temperatures are pale blue and warmer temperatures are deep blue. Middle: new result, using new technique to reduce noise amplification in the process of retrieval. Right: noise removed.
The noise removed by the new method compared to old is shown in the right panel. The noise should look completely random, but in fact there are some streaks where there is a tendency to blue or red, indicating non-random effects. This appears to be a result of imperfect co-registration of the forward and nadir views in the older imagery (we have improved the offset correction between the views in the latest experimental products as well).