Hi - looks good. Would suggest a final read by the authors - I picked up a couple of things in a quick scan. For example:

Abstract line 21 "factors, such as soil moisture content, have been shown to impact
very significantly the soil spectra, making the use of model derived on soil spectra libraries very difficult"

"making use of model derived on" does not make sense

typo - line 42 "controleld conditions"

citing - why B.H. Kusumo and B. Kusumo - lines 47 and 55 - different persons? is there a reason these have initials whereas others don't? 

"Conclusion" - maybe should be "Conclusions"
