Explain the category of wastelands classified by National Remote Sensing Agency (NRSA).

National Remote Sensing Agency (NRSA) has classified wastelands by using remote sensing techniques and it is possible to categorise these wastelands according to the processes that have created them.
(i) There are a few types of wastelands such as gullied /ravinous land, desertic or coastal sands, barren rocky areas, steep sloping land, and glacial areas, which are primarily caused by natural agents.
(ii) There are other types of degraded lands such as waterlogged and marshy areas, land affected by salinity and alkalinity and land with or without scrub, which have largely been caused by natural as well as human factors.
(iii) There are some other types of wastelands such as degraded shifting cultivation area, degraded land under plantation crops, degraded forests, degraded pastures, and mining and industrial wastelands, are caused by human action.

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