Crop residues can retain soil moisture and increase soil organic matter. Crop residue cover is also a hot issue in agricultural remote sensing. Crop residue cover can be estimated linearly with cellulose absorption index (CAI), while moisture of crop residues and soil would reduce the accuracy of crop residue cover estimation. Crop residue and soil were used as materials to carry out the laboratory experiment to reveal the impact of moisture on crop residue cover estimation and eliminate said impact. This paper discovered a sensitive band, R2005, which can invert water content of materials to eliminate moisture effect and improve estimation accuracy of crop residue cover. In terms of inverting water content, compared with two ratio water indices proposed in 2016 (R1.6/R1.5, R1.6/R2.0), using R2005 can increase R2 from 0.828 to 0.935 and decline root-mean-square error (RMSE) from 0.12 to 0.07. At the point of results validation, R2 is 0.958 and RMSE is 0.06, indicating R2005 has a high accuracy. Another advantage of R2005 is that it is more suitable to promote to actual production because of simple and efficient band calculation.
Bibliographical noteFunding Information:
Author Contributions: Y.W. was responsible for data processing, primary analysis, visualization and paper writing. S.Z. was responsible for funding acquisition, supervision and paper revision. W.C. had provided great help in the laboratory experiment and data analysis. J.H. had made great contribution in revision and verbal polish. F.P. had help a lot in the laboratory experiment.
© 2019 by the authors.
All Science Journal Classification (ASJC) codes
- Geography, Planning and Development
- Renewable Energy, Sustainability and the Environment
- Environmental Science (miscellaneous)
- Energy Engineering and Power Technology
- Management, Monitoring, Policy and Law