4.2. Future of soil spectroscopy in SOC estimation
To reduce global as well as local level threats, capability of all stakeholders in agricultural sections must be enhanced resulting in elimination of negative environmental pressures (Lipper, Thornton et al. 2014). Research is continued for establishing SSLs. Production of SSLs take place at low price and with little effort in comparison to analytical wet chemical procedures (accountable for environmental issues owning to chemicals used in them) (Demattê, Dotto et al. 2019), however, usage of SSLs was restricted on behalf of confined estimations. Nowadays confined regression procedures involving application of spectral sources as well as geographical proximity were established for improving SOC estimation (Lobsey, Viscarra Rossel et al. 2017), (Tziolas, Tsakiridis et al. 2019). Additionally, lack in comparability among various studies is another challenge. This is because of reason that similar procedures are not employed for model assessment as well as correctness and particular data required for making comparison between them is also missing in studies (Romero, Ben-Dor et al. 2018).
Importance of RS platforms cannot be exaggerated for establishing new observational modalities and enhancing computing, observation, and description practices at different levels in context of manageable progress objectives set by United Nations (Anderson, Ryan et al. 2017). Hence, purpose of RS data is as a proxy designed for SOC estimation resulting in large level maps within frame of soil related indicators such as SDG indicator 15.3 (Tóth, Hermann et al. 2018), (Keesstra, Bouma et al. 2016). Possibly, SSLs proved to be excellent foundation for upcoming hyperspectral remote sensing of soils from space (Guanter, Kaufmann et al. 2015) because they could find uses in support of Copernicus program as well as for collaborative usage with mobile proximal soil (Kühnel and Bogner 2017) besides airborne sensors (Castaldi, Chabrillat et al. 2018).