A Vector Data Model for Efficiently Rendering Large Vector Maps on Global 3D Terrain Surfaces

Round 1

Reviewer 1 Report

No comments for authors.

Author Response

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Author Response File: Author Response.docx

Reviewer 2 Report

This is a very interesting research area, and there are strong interests in the results of is. here are comments:

• The manuscript has to go through a detailed editing process. There are some long sentences, that are hard to read. 

• An important related research in digital glob grid system, is missing in the related work section. 

  • Mahdavi-Amiri A, Alderson T, Samavati F. A survey of digital earth. Computers & Graphics. 2015 Dec 1;53:95-117.
  • Alderson T, Purss M, Du X, Mahdavi-Amiri A, Samavati F. Digital earth platforms. InManual of digital earth 2020 (pp. 25-54). Springer, Singapore.
• There is a paragraph in 184 to 189, that reads like related work. It probably needs to move to the correct section. 
• Labels of vector tiles in the figure 4 are too small, hard to read
• In line 303 the number of levels is selected as seventeen. This selection needs some justification.
• In 345 to 359 it will be more helpful to add index number in the analysis.

good luck!

Author Response

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Author Response File: Author Response.docx

Reviewer 3 Report

This paper deals with the questions of theoretical Geoinformatics and vector data processing. Specifically, the authors developed a novel VTPM model which has two major advantages in vector data processing:

1) VTPM enables fast access to vector data;

2) VTPM are easily combined using a geometry-based approach or texture-based approach.

Besides, VTPM is a compromise solution that effectively visualizes vector data on 3D terrain surfaces, achieving a better balance between efficiency and effect.

Thus, Wang & Chen deal with questions of data topology, data capture and rendering in geoinformation domain.
The study provided a rationale for the methods of spatial data analysis and 3D data processing for vector data modelling, and clearly described how it added value to the existing literature by experimenting with new methods.
The clarity of the text and organization of the paper is sufficient. The interpretation of facts and justification of the conclusions are well presented in the study.
The paper is well organized, logically structured and demonstrates consistent interpretation of the results with detailed explanations. 
Each section is well structured and sufficiently extended. A comparison of the achieved results with those of the previous studies is presented.
The Methodology section is well structured and includes sufficient information to reproduce these methods in a similar research.
The writing logic of the data analysis is clear. The authors well explain the importance and novelty of this study, which consists in technical approach of assessment and evaluating of vector data for 3D representation for efficiently rendering large vector maps on global 3D terrain surfaces.

Thus, the paper well combines technical and cartographic methods with algorithm approaches of data analysis which presents a multi-disciplinary study well deserved to be published in the ISPRS International Journal of Geo-Information – MDPI journal which has a major focus on Geo-Information and spatial data processing. In this way, the present study is relevant to the journal topic as corresponding to the major domain and research disciplines of the journal: Cartography, GIS, algorithms.

The manuscript includes 8 figures. The presented figures are of good quality, easy to read, relevant and illustrative. They support general understanding of the study and well demonstrate the results.

the general structure of the manuscript corresponds to the norms for journal publications: 14 pp., 8 Figures, 5 Tables, 32 References. 

My detailed reviewer's report can be found as the attached pdf file with a summary of the work and corrected occasional misprints that should be corrected.

This manuscript can be ACCEPTED after minor corrections (mostly misprints) based on the detailed attached report.

With kind regards, - Anonymous Reviewer, 23.03.2022.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.docx