A New Systematic Framework for Optimization of Multi-Temporal Terrestrial LiDAR Surveys over Complex Gully Morphology
Round 1
Reviewer 1 Report
In the manuscript, the authors presented the results of applying the methodology of constant reference points to organize multitemporal gully observation series in Croatia.
The methodology used raises minimal questions, viz:
Lines 99-107 - too much "complex".
line 153 - what does "resolution: 1⁄2; quality: 3x" mean?
line 173 - what is the tool "Earth curvature correction and refraction coefficient" used for - there will be no effect of Earth curvature on a ravine 140 meters long. and it is unlikely that anyone will do geodetic work on such a scale with a ground laser scanner.
Line 231 - what is "Fist activity"?
First, why did the authors determine the positions of markers and not station points? What is the coordinate error and how was it taken into account when stitching the scans?
Line 233 - size in centimeters, line 268 - in meters.
The methodology used is not new. organizing a network of permanent reference points is standard practice in surveying work.
I also cannot say that the authors suggested something new to the methodology of selecting scanning points - in general, the station is always set so that the scanning was performed across the "wall of the slope". The method of processing the scanning results and matching the scans with each other is also a standard procedure, documented by the developers of scanning equipment and the software package.
Thus, I cannot recommend the manuscript for publication for lack of new knowledge on the topics proposed by the authors. Multi-year monitoring of gully erosion using terrestrial scanning is the most developed area of application of appropriate equipment in geomorphology.
Author Response
Appreciated suggestions and comments of the reviewer were accepted and corrected in the revised version of the manuscript.
Author Response File: 
Author Response.docx
Reviewer 2 Report
Comments to the reviewed article are included in the attached file.
Comments for author File: 
Comments.pdf
Author Response
Appreciated suggestions and comments of the reviewer were accepted and corrected in the revised version of the manuscript.
Author Response File: Author Response.docx
Reviewer 3 Report
Please see the attachment
Comments for author File: Comments.pdf
Author Response
Appreciated suggestions and comments of the reviewer were accepted and corrected in the revised version of the manuscript.
Author Response File: Author Response.docx
Reviewer 4 Report
The paper is interesting, but presents some critical issues related to the input data, the geomorphological and climatic contextualization of the study area and the extended use of this technology in the future and in other contexts. In particular, the authors should contextualize the area from a geological point of view, as well as produce a geomorphological map of a sector more extensive than the gully of reverence to help understand what are the morpho-evolutionary processes taking place.
The multitemporal analysis carried out with on-site measurements in one year, should also show the evolutionary differences of the phenomenon on the map. Even if a year could pass with minimal variations and then a high acceleration of erosion could be recorded in correspondence with intense or even extreme rain events.
From the few images of the head or upper part of the gully, among other things, the phenomenon seems to me more of a landslide than of linear erosion.
The authors are suggested to integrate the cognitive framework and discuss the data, also using a geomorphological map that is completely lacking in the work.
References can be integrated with this work:
Lazzari M. 2020 - High-resolution LiDAR-derived dEMs in hydrografic network extraction and short-time landscape changes. In: Gervasi O. et al. (eds) Computational Science and Its Applications - ICCSA 2020. Lecture Notes in Computer Science, vol 12250, pp 723-737. Springer, Cham. https://doi.org/10.1007/978-3-030-58802-1_52
Neugirg F., Stark M.,. Kaiser A, Vlacilova M,. Della Seta M., Vergari F., Schmidt J., Becht M., Haas F., 2016- Erosion processes in calanchi in the Upper Orcia Valley, Southern Tuscany, Italy based on multitemporal high-resolution terrestrial LiDAR and UAV surveys, Geomorphology,269, 8-22, https://doi.org/10.1016/j.geomorph.2016.06.027 .
Author Response
Appreciated suggestions and comments of the reviewer were accepted and corrected in the revised version of the manuscript.
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
The authors seriously revised the manuscript and answered the reviewer's questions.
Nevertheless, the manuscript should pay special attention to the justification of the novelty of the research, which, so far, has not been done or has been done implicitly.
Author Response
Authors would like to thank the Reviewer for his valuable suggestion. Detailed explanation of the novelty of the research was given in the section 4.1. Advantages of developed framework over the non-systematic TLS survey approach, between line 566 and line 584.
Best wishes,
Authors
Author Response File: Author Response.docx
Reviewer 2 Report
The reviewers' comments were taken into account. I believe the article has been sufficiently improved, it can be published in this version.
Author Response
Authors would like to thank Reviewer for the earlier provided suggestions and comments, which have improved the revised version of the manuscript.
Best wishes,
Authors
Author Response File: Author Response.docx
Reviewer 4 Report
The paper was improved by the authors following almost all suggestions.
Author Response
Authors would like to thank Reviewer for the earlier provided suggestions and comments, which have improved the revised version of the manuscript.
Best wishes,
Authors
Author Response File: Author Response.docx
