A constellation of radar satellites in LEO orbit is being used to monitor the open ocean. The system collects two SAR images of the same area separated by a few hours in time. In the first image, the ocean appears dark, but in the second it appears brighter. What is the most likely cause of this difference? A. An oil spill occurred between the images, making the water more smooth. B. The wind speed increased between the images, causing waves to form on the ocean surface. C. The first image was collected at an oblique angle, while the second was taken looking straight down (a nadir view). D. The collection geometry changed between images resulting in a Doppler shift of the signal intensity.

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A constellation of radar satellites in LEO orbit is being used to monitor the open ocean. The system collects two SAR images of the same area separated by a few hours in time. In the first image, the ocean appears dark, but in the second it appears brighter. What is the most likely cause of this difference?

A. An oil spill occurred between the images, making the water more smooth.

B. The wind speed increased between the images, causing waves to form on the ocean surface.

C. The first image was collected at an oblique angle, while the second was taken looking straight down (a nadir view).

D. The collection geometry changed between images resulting in a Doppler shift of the signal intensity.

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