Why are there large gray areas in the middle of the Sea Colour satellite data?
This is sun glint. When it affects the sea surface temperature it looks like the images that appear above. However when it affects sea colour it appears as a gray mass. The sun on the water can act as a giant reflector at times and affects the visible channels which are used in the Chlorophyll algorithm and products so it is masked out. In some cases it doesn’t affect the SST products because they use the thermal channels so it appears alright on those images. In other cases it does and the software automatically removes it. Click here to see an unprocessed visible image of satellite data on which you can see the sun glint areas (The light green areas). 13. Converting Latitude/Longitude GPS coordinates For the marine and fishing industries the traditional way to show position on a GPS or a chart is in Latitude and Longitude. Various brands of chart plotters and GPS show Lat/Long in either one of three basic ways: a. DM.m = Degrees and Decimal Minutes (eg. 45 22.6333′) b. D.d = Decimal
