These satellites circle the earth in a north- to- south direction, and obtain images of the entire Earth twice a day by drifting about 15 degrees westward over the earth's surface during each orbit.

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The description provided matches that of polar satellites, which orbit the Earth in a north-to-south direction and pass over both the North and South poles. These satellites are able to obtain images of the entire Earth twice a day by drifting about 15 degrees westward over the Earth's surface during each orbit. Doppler satellites measure the speed and direction of objects on the Earth's surface, while Automated Surface Observing Systems are automated weather stations on the ground. Geostationary satellites, on the other hand, orbit at the same speed and direction as the Earth's rotation and therefore stay in a fixed position relative to the Earth's surface.

These Satellites Circle the Earth in a North- To- South