Discussion
.................... are basic and still widely used form of Remote Sensing.
Answer: C
The basic and still widely used form of remote sensing is aerial photographs.
Remote sensing began with photographs taken from balloons and aircraft, and aerial photography remains in wide use for topographic mapping, land use surveys, forestry and urban planning, because of its high spatial resolution and the stereoscopic (three-dimensional) view that overlapping photographs give.
Radar, multispectral scanner (MSS) and hyperspectral data are later and more specialised techniques that depend on satellite or airborne sensors developed from the 1960s and 1970s onwards.
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