Give an account of along-track and across-track scanners. 

Remote sensing is the process of collecting information about the earth's surface without physically being present at the location. This is achieved through the use of sensors installed on satellites, aircraft, or other platforms. The sensors collect data about the earth's surface and transmit it back to the ground for further analysis. Among the key components of remote sensing systems are scanners, which are used to collect data about the earth's surface.

Scanners can be classified into two categories: along-track scanners and across-track scanners. These scanners differ in how they collect data about _____ ________ _________ ________ _____ __________ _______.
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