The Influence of Pillar Displacements on Geodetic Measurements
Round 1
Reviewer 1 Report
This paper evaluates and quantifies the effects of a geodetic pillar displacement dues to temperature variations on topometric measurements and coordinate determination. It is done using mathematical development and simulations.
My feedback about this work is positive. It is well written and the equations are detailed, which helps to understand the theoretical background of the problem. It deserves to be published in Applied Sciences.
I have only a few comments to mention:
* l35: You use the term “emission factor”, but in such context, it should be more an “absorption factor” no?
* the figure caption should be more complete, as the Table’s captions
* the unit of the Table’s d_AC columns should be in meter [m] and not [mm].
* It would be better if the introduction could contain a more detailed state-of-the-art, but it seems like this paper is the direct continuation of Močnik et al. 2019, where the introduction is more complete.
One other remark for further investigations: would it be possible to paint the pillar in white to see if it would reduce the temperature variation and thus the pillar movement?
Author Response
Comments and Suggestions for Authors
This paper evaluates and quantifies the effects of a geodetic pillar displacement dues to temperature variations on topometric measurements and coordinate determination. It is done using mathematical development and simulations.
My feedback about this work is positive. It is well written and the equations are detailed, which helps to understand the theoretical background of the problem. It deserves to be published in Applied Sciences.
The authors are grateful for recognizing the value of our work and would like to thank for suggestions for improvements.
I have only a few comments to mention:
* l35: You use the term “emission factor”, but in such context, it should be more an “absorption factor” no?
Answer:
Agree, thank you, corrected in the text, see page 1 of revised text.
* the figure caption should be more complete, as the Table’s captions
Answer:
We agree. The cations bellow Figures 4-9 are now more precise.
* the unit of the Table’s d_AC columns should be in meter [m] and not [mm].
Answer:
Agree, thank you, corrected in the text.
* It would be better if the introduction could contain a more detailed state-of-the-art, but it seems like this paper is the direct continuation of Močnik et al. 2019, where the introduction is more complete.
Answer:
As similar comment was given by the other referee, the introduction was extended as it can be seen from revised manuscript.
The one other remark for further investigations: would it be possible to paint the pillar in white to see if it would reduce the temperature variation and thus the pillar movement?
Answer:
Thank you! We fully agree. It is a part of our plans for future studies.
Reviewer 2 Report
This manuscript presents the measuring of displacements of pillars due to temperature and the analysis of the results. The sensitivity to environmental changes in temperature in the different side of the pillar body can cause significant measurement errors. This article introduces displacement measurements on the network of various surveying angles and distances. This work does a good job demonstrating how the environment affects geodetic positioning with a thorough investigation based on surveying angles and distances. The authors have tested the surveying angles with a 30degree interval and three survey distances with a 50meter break. The effects are different on control points, orientation points, and survey points. Based on the factors above, I would approve of this manuscript. I should, however, suggest the following:
- The introduction would be more effective to include the physical properties of the pillar and the temperature meter. It is essential to consider the material, size, and shape of the pillar and the temperature meter's accuracy. All conditions above can sway the measurement results.
- Make a comparison among other measurement error sources and the temperature-based errors to further understand how significant the errors propagate.
- Minor changes in Figure 7, 8, and 9. The scales of meter and millimeter are confusing.
- I would suggest cutting down the equations in the manuscript. Readers do not have to review their undergrad math.
Author Response
Comments and Suggestions for Authors
This manuscript presents the measuring of displacements of pillars due to temperature and the analysis of the results. The sensitivity to environmental changes in temperature in the different side of the pillar body can cause significant measurement errors. This article introduces displacement measurements on the network of various surveying angles and distances. This work does a good job demonstrating how the environment affects geodetic positioning with a thorough investigation based on surveying angles and distances. The authors have tested the surveying angles with a 30degree interval and three survey distances with a 50meter break. The effects are different on control points, orientation points, and survey points. Based on the factors above, I would approve of this manuscript. I should, however, suggest the following:
- The introduction would be more effective to include the physical properties of the pillar and the temperature meter. It is essential to consider the material, size, and shape of the pillar and the temperature meter's accuracy. All conditions above can sway the measurement results.
Answer:
We extended the Introduction as suggested, see page 2.
- Make a comparison among other measurement error sources and the temperature-based errors to further understand how significant the errors propagate.
Answer:
These has been done in our previous work and find no reason to publish these results again. However, the reader is now referred to our paper where this information can be found.
- Minor changes in Figure 7, 8, and 9. The scales of meter and millimeter are confusing.
Answer:
To stress the results (especially when dealing with different magnitudes of the quantities involved) different scales are often used. To avoid any confusion explanation has been added to the figures.
- I would suggest cutting down the equations in the manuscript. Readers do not have to review their undergrad math.
Answer:
Thank you for this suggestion. Especially the Subsection 2.2 was a bit to detailed for the level of journal paper. It is now shorter.
