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Article
Peer-Review Record

The Impact of Seasonality and Land Cover on the Consistency of Relationship between Air Temperature and LST Derived from Landsat 7 and MODIS at a Local Scale: A Case Study in Southern Ontario

Land 2021, 10(7), 672; https://doi.org/10.3390/land10070672
by Michael Burnett and Dongmei Chen *
Reviewer 1: Anonymous
Reviewer 2:
Emerson Galvani
Land 2021, 10(7), 672; https://doi.org/10.3390/land10070672
Submission received: 17 May 2021 / Revised: 17 June 2021 / Accepted: 23 June 2021 / Published: 26 June 2021
(This article belongs to the Special Issue Spatiotemporal Variations of Land Surface Temperature)

Round 1

Reviewer 1 Report

This study compared the relationship between MODIS LST or Landsat 7 LST and Tair using GEE. The study has done a lot of analyses. However, I have several major concerns as bellow:

  • The title of this study is misleading. This study didn’t compare the MODIS LST and Landsat LST, instead, it compared their relationships with Tair.
  • The abstract can be improved since I am completely lost on the research focus and findings of this study here.
  • The scientific question of this study is unclear. Are there any previous studies on the relationship between LST and Tair? What are the knowledge gaps? Why we need to compare the LST with Tair at different time scales, not the time most close to the overpass time of LST?
  • I think a comparison of the LST observations at only two spatial resolution cannot determine the optimal LST scale and thus the second objective of this study is not convincing. In fact, I am confused what are the so-called scale in this study. From the results, it seems that this study try to find the optical time of the closest relationship between the LST and Tair. But I think this has nothing to do with the scale issue and I am confused why we need such comparison. For example, Table 3 tell us the optimal Tair is daily mean or daily max. I am very confused 1) why this happen and 2) what applications of this finding since LST is observed at the overpass time only.
  • I am confused on what comparisons have been made in this study. Have this study compared the Landsat LST and MODIS LST directly? The MODIS LST, Landsat LST, and Tair are measured at different spatial scales, how did study match the scales. In addition, Landsat and MODIS have different temporal resolutions that means the samples of the correlation analysis should be different. How can we compare the correlation coefficients with the different number of samples?
  • There are many weather stations. It remains unclear how did this study calculate the correlations (put all the data together or calculated separately?).
  • There are bad lines of the Landsat 7 data after 2003. How did this study fill the gaps?

Author Response

Please find attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

It is necessary to include a map of the location of the study area articulating with the map of North America, for example. Additional information such as location coordinates of the study area must be included on the map, as well as an appropriate legend.

The population characteristics of the study area must be included in the text, as well as an explanation for choosing the 100 km limit of the study area. The choice of the study area needs to be better explained. At the end it is observed that a study area could be any point on the Earth's surface.

The missing date in the surface meteorological data must be included in the text and what strategies are used to mitigate, as the percentages in each station must be included in the text.

Climatic characterization of the study area on a regional scale should be included in the text. If possible, characterize the climatic conditions of the days used in the validation of the models.

Discuss the results obtained in Tables 2 and 3, evaluating why the correlations are higher at certain times for hourly data (12:00, 14:00 or 16:00) and in some evaluations with average daily data.

Explain, climatically, the choice of time frames adopted between days 100 to 290 and 1-99 and 291-366.

In figures 2 and 3, it is necessary to point out the pattern of land use and coverage in the limits surrounding the study area. It is important to produce a representation in a scatterplot to visualize the data.

The discussion of the results needs to be expanded, as the literature on the topic is growing every day.

Appendices must be cited in the text.

With these adjustments and a revision of the English language, the work is subject to publication.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

I appreciate the authors’ great efforts to address the most concerns. The scientific question of this study is clearer now and I’d like to recommend publication of the current manuscript.

 

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