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).