Accuracy Verification and Correction of D-InSAR and SBAS-InSAR in Monitoring Mining Surface Subsidence
Round 1
Reviewer 1 Report
Dear authors,
please find below some general comments.
Several sentences are unclear and need to be reformulated: L18- L20, L118-119, L257-259
L17: I would replace “with large subsidence” by having high displacement rates
L62: Cavities? Do you mean no data due to decorrelation? I would rephrase by saying that the SBAS failed to measure fast moving zones or something similar.
L116: To obtain the deformation phase, actually you have to remove all the other contributions to the phase and try to minimise the possible noise.
L121: typo error :bound instead of wound
L138/142: What is a “public” master? Please explain or rephrase.
L246-253: Based on the images and explanation provided above, in my opinion it is impossible to conclude that SBAS is more efficient. You should rework this part to make this statement.
In the paragraph 5.3 you compare the displacements given by the 3 techniques at different places of the mines. Where the velocity/max displacement is to high the SBAS and DInSAR are much more different than the levelling. Elsewhere, there is a good match. I am wondering if the good Pearson coefficient is not just related to the fact that when D-INSAR or SBAS are having a linear behavior?
Kind regards
Author Response
Dear Reviewer,
Thank you very much for your comments. These comments play an important role in revising the paper and improving the quality of the paper. We have revised our manuscript according to comments of you. Please see the attachment for details.
Author Response File: 
Author Response.docx
Reviewer 2 Report
Current paper concerns a very interesting topic which is the application of SAR interferometry over mining areas (although a lot of similar papers have published). However this paper needs improvements and additions to improve and be accepted for publication by the journal. I have some comments and questions concerning the manuscript.
line 27: "due to the influence of technology characteristics" (?)
line 48: InSAR technologies or methods? You have to decide about the interferometric methods that you have use in this study. Because according to me the technology concerns the active SAR sensors configuration but interferometry has different methods of application.
line 118: which is the precision of the DEM and concerns a DEM or a DSM
line 155: About SVD please add reference (s)
I have also the fo0llowing questions.
Which algorithm have you used for the unwrapping?
Does the rate of deformation is an important factor in order to detect and map the deformation? WE know that the D- InSAR has several problems related to coherence and the rate of deformation induced by the subsidence phenomenon.
Author Response
Dear Reviewer,
Thank you very much for your comments. These comments play an important role in revising the paper and improving the quality of the paper. We have revised our manuscript according to comments of you. Please see the attachment for details.
Author Response File: Author Response.docx
Reviewer 3 Report
The main goal of the research was to compare the D-InSAR-, SBAS-InSAR- and leveling- monitored results of different subsidence. The subsidence was caused by mining activity in mining area in Shandong Province. The study area is hazarded by underground mining activity, which is quite shallow and the dynamism of the deformation process is high.
The authors proved that InSAR observation combined with the results of leveling may be effective tool to assess deformation in the study area. Nevertheless, the research are based on known monitoring methods, so the novelty of presented solution is rather moderate.
I think that presented research are interesting case study of applying InSAR techniques to monitor ground movements caused by mining activity.
- The advantage of the presented methodology is:
1.1. high accuracy of the observation of displacement,
1.2. potential of adjusting InSAR measurements to terrestrial measurements (the geodetic measurements should be done in the same period of the time when InSAR measurements were analyzed ). Based on recorded data back analysis could be done.
1.3. ability to analyze ground movements in any time.
1.4. spatial coverage of the InSAR technology, the leveling is discrete monitoring method
1.5. the images from Sentinel mission are for free, so that it is also cost-effective monitoring system.
- Disadvantages of presented method is
2.1. necessity of the adjusting InSAR measurements to terrestrial measurements (leveling, GPS)
2.2. lack of novelty in the presented solution. Presented solution is appropriate only to the area were research were done.
2.3. Lack of information why S-BAS method (Fig. 5) has so weak coherence.
- Some editorial remarks
3.1. Please try to unify the sizes and styles of the font on the figures (in general). The good explanation of the research (presented on the figures) is a strong point of the research. Please try to work on that.
3.2. Please extend the references, there were many interesting research done on that issue. If you will extend the references the international visibility of your research will increase.
After improvement the article can be published
Author Response
Dear Reviewer,
Thank you very much for your comments. These comments play an important role in revising the paper and improving the quality of the paper. We have revised our manuscript according to comments of you. Please see the attachment for details.
Author Response File: Author Response.docx
Round 2
Reviewer 2 Report
Dear co-authors thank you for upgrading the paper in I agree to accept for publication. I want only to mention the folowing:
I am still wary of using the term technologies for DInSAR and SBAS like in
page 2, line 70 : D-InSAR and SBAS-InSAR two InSAR technologies. Please search this issue.
Author Response
Dear Reviewer,
Thank you very much for your comment. We have revised our manuscript according to the comment of you. Please see the attachment for details.
Author Response File: Author Response.docx
