2.3. Unmanned Aerial System (UAS)
From past few years, UAS is an efficient as well as low price platform for environmental monitoring (Whitehead and Hugenholtz 2014). Owing to usage of innovative sensors, low cost, development in sensor’s size as well as spectral resolution UASs have wide range of uses. Both spaceborne characteristics (i.e., brief revisit period) as well as airborne platforms (including an extraordinary resolution) are combined in UAS, and it is the distinctive characteristic of UAS to give resolution required on the way to protect diversity of agri-environmental landscapes (Pádua, Vanko et al. 2017). Inspite of these merits, research related to soil characteristics analysis is restricted owing to restricted payload, restricted flight duration as well as issues of image processing (Zhang and Kovacs 2012).