This comparison demonstrates the additional information that one gains from using ocean color chlorophyll in conjunction with the information provided from the SST. Four areas are marked (A, B, C, D) for specific evaluation. Of these, areas A, B, and C show the increase in detail for locating currents and current boundaries that NASA's ocean color/chlorophyll imagery provides. The ocean color imagery provides a greater advantage when the SST becomes homogenous and when there is atmospheric interference from haze and high humidity. When there is substantial cloud cover, the ocean features are obscured.