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Whiskbroom and Pusbhbroom Scanners.

Answer» <html><body><p></p>Solution :Whiskbroom scanners, also sometimes <a href="https://interviewquestions.tuteehub.com/tag/referred-7264329" style="font-weight:bold;" target="_blank" title="Click to know more about REFERRED">REFERRED</a> toas spotlight or across track scanners, use a mirror to reflectlight into a singledetector . The mirror moves <a href="https://interviewquestions.tuteehub.com/tag/back-389278" style="font-weight:bold;" target="_blank" title="Click to know more about BACK">BACK</a> and forth , to collect measurements from one pixel in the image at a time . Itis shown below: <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/FM_GEO_XI_P3_C07_E02_023_S01.png" width="80%"/> <br/>The moving parts make this type ofsensor expensiveand more likely to wear out. <br/> Pushbroom Scanners: <br/> Pushbroom scanners are also sometimes referred to as along track scanners. Itis used a line of detectors arrangedperpendicular to the flight direction ofthe spacecraft . As the spacecraft flies forward, the image is collected one line at a time , with all of the <a href="https://interviewquestions.tuteehub.com/tag/pixels-1155203" style="font-weight:bold;" target="_blank" title="Click to know more about PIXELS">PIXELS</a> in a line being measured simultaneously. It is shownwith the help offollowing figure. A pushbrooms scanner receives a strong singal than a whiskbroom scannerbeacuse itlooks at each pixel area for longer . One drawback of pushbroom sensors is that the detector in the " pushbroom" can have varying sensitivity. If they arenot perfectly calibrated , this can result in stripes in the data. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/FM_GEO_XI_P3_C07_E02_023_S02.png" width="80%"/> <br/> Sensors that usethe pushbroom design <a href="https://interviewquestions.tuteehub.com/tag/include-11332" style="font-weight:bold;" target="_blank" title="Click to know more about INCLUDE">INCLUDE</a> SPORT , IRS, QuickBrid, Orb View etc.</body></html>


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