Hyperspectral Reflectance Characteristics of Rice Canopies under Changes in Diffuse Radiation Fraction

Round 1

Reviewer 1 Report

This paper investigated the Hyperspectral Reflection Characteristics of Rice Canopy by using the Change of Diffuse Radiation Fraction. Overall, the structure of this paper is well organized, and the presentation is clear. However, there are still some crucial problems that need to be carefully addressed before a possible publication. More specifically,

1. A deep literature review should be given, particularly regarding state-of-the-art hyperspectral remote sensing techniques. Therefore, the reviewer suggests discussing and analyzing some representative works in the revised manuscript, such as

[1] “Graph convolutional networks for hyperspectral image classification”;

[2] “Nonconvex-Sparsity and Nonlocal-Smoothness-Based Blind Hyperspectral Unmixing”;

[3] “Endmember extraction of hyperspectral remote sensing images based on the ant colony optimization (ACO) algorithm”

[4] “Real-time target detection in hyperspectral images based on spatial-spectral information extraction”

2. The reviewer is wondering the running efficiency and complexity of the proposed framework.
3. It would be better to add a whole workflow for the proposed method in order to give a big picture to the readers.
4. It is well-known that the remote sensing data tend to suffer from various degradation, noise effects, or variabilities in the process of imaging. Please give the discussion and analysis by referring to the paper titled by An Augmented Linear Mixing Model to Address Spectral Variability for hyperspectral unmixing. The reviewer is wondering what will happen if the proposed method meets the various variabilities.
5. Some future research direction should be pointed out.

Author Response

Dear Reviewer:

Re: Manuscript ID: remotesensing-1456483 and Title: Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction

 

Thank you for your letter and the reviewers’ comments concerning our manuscript entitled “Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction”. Those comments are valuable and very helpful. We have read through comments carefully and have made corrections. Based on the instructions provided in your letter, we uploaded the file of the revised manuscript. T The responses to reviewers' comments are also uploaded in the attachment.

 

We would love to thank you for allowing us to resubmit a revised copy of the manuscript and we highly appreciate your time and consideration.

 

Sincerely.

 

Tao Zhang.

Author Response File: Author Response.pdf

Reviewer 2 Report

In the paper “Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction” by Tao Zhang et. al. the changes of SPAD, LAI, and canopy spectral characteristics of rice under the increasing diffuse radiation fraction were analyzed

The article is of practical interest. The discussion section contains interesting conclusions.

 I have a small note:

Authors should decipher the acronyms SPAD, LAI and LSD (method) and also explain the difference between

meaning of letters a, b, c marking data in tables.

I believe that after the introduction of the specified clarifications, the article can be published in Remote Sensing

Author Response

Dear Reviewer:

Re: Manuscript ID: remotesensing-1456483 and Title: Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction

 

Thank you for your letter and the reviewers’ comments concerning our manuscript entitled “Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction”. Those comments are valuable and very helpful. We have read through comments carefully and have made corrections. Based on the instructions provided in your letter, we uploaded the file of the revised manuscript. The responses to reviewers' comments are also uploaded in the attachment.

 

We would love to thank you for allowing us to resubmit a revised copy of the manuscript and we highly appreciate your time and consideration.

 

Sincerely.

 

Tao Zhang.

Author Response File: Author Response.pdf

Reviewer 3 Report

Sky diffuse radiation has large effects on vegetation growth. This manuscript presents the designed experiments to evaluate the effects of sky diffuse radiation on hyperspectral reflectance as well as SPAD and LAI, which is interesting. However, some experiment details need to be added to clearly present their experiment design, such as when and how to measure reflectance under different scenarios, how large the sample plots are, how to measure LAI and SPAD (how many leaves), why to set T1 and T2, the measurement geometries (solar angle, viewing angle), etc. After adding these descprition, I can futher evaluate the results.

Major concerns:

1. What does SPAD represent (Chla, Chlb or total Chl)? Give more explanations.
2. Line 104, which statistical test did the author use? Please give more details. The significant difference can be observation for rain and radiation in Figure 1.
3. Table 1, T1 and T2 had the same transmittance rate but different diffuse radiation fraction? How did the authors calculate diffuse radiation fraction here. Different days have different diffuse radiation fraction. Also explain the different meanings of ‘a-c’. Please also explain why using different materials to simulate different diffuse radiation fractions.
4. How did the authors measure the reflectance under the control and T1 and T2 scenarios? The downward (incoming) radiations are different for these three scenarios.
5. How about the variation of NIRvH, which represents the pure vegetation NIR reflectance.

Zeng, Yelu, et al. "Estimating near-infrared reflectance of vegetation from hyperspectral data." Remote Sensing of Environment 267 (2021): 112723.

6. Why did the authors measure the data only in these 3 days? What time did the authors measure them? How about the sky condition (diffuse skylight) in the observed time?

7. Show the experimental scenarios of different configurations (CK, T1 and T2).
8. How about the measurements of LAI and SPAD? From table 1 and 2, the differences in SPAD and LAI are not very significant.
9. How about the immediate reflectance variations when the material was covered? Please check the BRDF/HDRF effects?
10. Did the reflectance measured at the same time (same solar angle) at nadir?

Minor concerns:

1. Line 20, what are T1 and T2?
2. Line 15, Give the full name of SPAD and LAI.
3. Line 14, add the ‘.’ after ‘respectively’.
4. Line 22, LAI is an canopy parameter rather than a physiological trait.
5. Please check the citation format throughout the manuscript.
6. Line 86, “my thesis”?

Author Response

Dear Reviewer:

Re: Manuscript ID: remotesensing-1456483 and Title: Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction

 

Thank you for your letter and the reviewers’ comments concerning our manuscript entitled “Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction”. Those comments are valuable and very helpful. We have read through comments carefully and have made corrections. Based on the instructions provided in your letter, we uploaded the file of the revised manuscript. T The responses to reviewers' comments are also uploaded in the attachment.

 

We would love to thank you for allowing us to resubmit a revised copy of the manuscript and we highly appreciate your time and consideration.

 

Sincerely.

 

Tao Zhang.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The authors have well addressed the reviewer's concerns. No more comments.

Author Response

Dear Reviewer:

Re: Manuscript ID: remotesensing-1456483 and Title: Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction

 

Thanks again for your valuable comments about this paper! These comments have benefited me a lot. Especially the papers you recommend let me know the latest technology about hyperspectral. Finally, best wishes to you!

 

Sincerely.

 

Tao Zhang.

Reviewer 3 Report

The authors tried their best to solve my concerns. I am also curious how Solar-induced fluorescence (SIF) changes with different diffuse radiation, which can be a good research question in the future using the authors' experiments and data. I recommand that the authors can add SIF into the discussion.

Author Response

Dear Reviewer:

Re: Manuscript ID: remotesensing-1456483 and Title: Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction

 

Thank you again for your letter and the reviewers’ comments concerning our manuscript entitled “Hyperspectral Reflection Characteristics of Rice Canopy Under the Change of Diffuse Radiation Fraction”. Those comments are valuable and very helpful. The responses to reviewers' comments are uploaded in the attachment.

 

We would love to thank you for allowing us to resubmit a revised copy of the manuscript and we highly appreciate your time and consideration.

 

Sincerely.

 

Tao Zhang.

Author Response File: Author Response.pdf

This manuscript is a resubmission of an earlier submission. The following is a list of the peer review reports and author responses from that submission.