How do satellites work? Satellites, sensors, orbits, and angles

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Presentation transcript:

How do satellites work? Satellites, sensors, orbits, and angles

Minimum resolvable distance Angular resolving power: the angle subtended by imaginary lines passing between an imaging system and two targets placed at the minimum resolvable distance

Radian system of angular measurement 1 rad = an angle subtended by an arc with a length equal to the radius of the circle (L = r) The circumference of a circle = 2p (~6.283) rad 1 rad = 360°/2p = angle BAC = 57.29° 1 mrad = 10-3 rad

Resolving power of the human eye Instantaneous field of view (IFOV) IFOV = L/r rad = 4/20,000 rad = 0.0002 rad = 0.2 mrad

Object distance r' is proportional to image distance r The object size L' is equal to (L/r)r' where L/r is the IFOV This defines the spatial resolution If the black object was smaller Some of the light from the gray objects would fall on the same receptor You would have trouble distinguishing between them How big must L' be for the average person to resolve it at a distance of 30 m?

Spectral resolution

Ground swath width = 2 tan(scan angle)r What is the ground swath width for SeaWiFS?

Ground resolution cell (pixel) size = (r)IFOV r = altitude/cos(scan angle)

http://www.youtube.com/watch?v=nLkBBkrDyG4&feature=player_detailpage http://www.youtube.com/watch?v=mWl-5m14nKk