Multispectral Scanners: Whiskbroom (Across track) & Pushbroom (Along track) Scanners| Remote Sensing

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Whiskbroom (Across track) Scanners : The whiskbroom scanners are made up of a rotating mirror and a single detector. The mirror is so oriented that when it completes a rotation, the detector sweeps across the field of view between 90° and 120° to obtain images in a large number of narrow spectral bands ranging from visible to middle infrared regions of the spectrum. The total extent of the oscillating sensor is known as the Total Field of View (TFOV) of the scanner. While scanning the entire field, the sensor’s optical head is always placed at a particular dimension called the Instantaneous Field of View (IFOV).
Pushbroom (Along track) Scanners: The pushbroom scanners consist of a number of detectors which are equivalent to the number obtained by dividing the swath of the sensor by the size of the spatial resolution. For example, the swath of High Resolution Visible Radiometer - 1 (HRVR - 1) of the French remote sensing satellite SPOT is 60 km and the spatial resolution is 20 metres. If we divide 60 km x 1000 metres/20 metres, we get a number of 3000 detectors that are deployed in SPOT HRV - 1 sensor. In pushbroom scanner, all detectors are linearly arrayed and each detector collects the energy reflected by the ground cell (pixel) dimensions of 20 metres at a nadir’s view. #examrace #upsc #ugcnet

[@i_yashh]

Mam the way you demonstrate using Animation is just fabulous

[@i_yashh]

Mam Thanks a ton for the animation It helped me to understand this Scanner topic in just a min I was very confused how does this works But finally i understood

[@priyashidas4241]

It's very helpful... thanks a lot ☺️

[@ryanmathew6397]

Thanks for your wonderful explanation

[@adityamohanta5046]

Very briefly described...

[@Examrace]

Complete lectures available at www.doorsteptutor.com

[@ashvanisharma8024]

Mam,I want to change the medium hindi to english for civil services.please help where I start?? , Please do reply ..

[@anandsan2457]

Good

[@ashvanisharma8024]

Good morning mam

[@swapnila371]

Could you give the link for playlist for Remote sensing? Thank you...

[@Examrace]

Complete preparation resource for GIS & RS - www.onestopgis.com/

[@swapnila371]

Thank you.. Very much

[@hk5848]

mam ye link hmari geo teacher ne diya tha