1. Full name:     Phan Quoc Yen                         2. Sex: Male

3. Date of birth: 02/02/1982                                4. Place of birth: Van Thanh - Yen Thanh - Nghe An

5. Admission decision number: The decision No. 2999/QD-ĐHKHTN dated August 18, 2016 of the University of Science - Vietnam National University, Hanoi

6. Changes in academic process: No

7. Official thesis title: Research topographic morphology of shallow water areas around Spratly islands by means of bathymetric remote sensing method and GIS

8. Major: Cartography, Remote Sensing and GIS             9. Code: 9440211.01

10. Supervisors:            Main supervisor: Assoc. Prof. Dr. Nguyen Hieu   

                                    Secondary Supervisor: Dr. Dao Khanh Hoai

11. Summary of the new findings of the thesis

- The thesis has experimented with the process and methods of estimating depth from optical remote sensing images of the shallow water area around the An Bang island (reaching 20m water depth), using the determined depth results to measure and draw the topography. The research results are the basis for the application of this process to other islands in the Spratly archipelago. The research results also show that the experimental remote sensing depth measurement algorithms often have spatially variable results. Therefore, it is necessary to conduct a step-by-step evaluation of the process before it is applied to a specific area.

- Develop software to implement the process of determining depth from multi-spectral remote sensing images in shallow water areas around the islands of Spratly archipelago;

- Combined with determined bathymetry from optical remote sensing data and field survey data, quantitatively assessing the topography change according to the seasons of the year, initially determining the law of morphological change of the island shoreline and the seabed topography around the floating island. Research shows that the Spratly archipelago in general and An Bang island in particular have complex natural conditions, and have a close relationship with the topography of the shallow water coastal area.

12. Practical applicability, if any:

The thesis has great practical significance, building software, technological process to determine seabed depth in shallow water areas around Spratly islands to meet urgent and long-term tasks. The method is low cost, easy to implement and fast to deploy. The results of the thesis are part of the project of the Ministry of National Defense, the software has been tested and applied at the surveying and mapping team and marine research - Navy.

13. Further research directions, if any

Due to the limitation of optical satellite image technology, the estimated shallow water depth is only 20m water depth. In addition, the accuracy is still limited compared to the requirements of the study area. Therefore, the topic needs to continue to be studied to expand the range of shallow water terrain and improve accuracy, to meet urgent and long-term tasks.

14. Thesis-related publications:

[1] Yen, Phan Quoc, and Nguyen Hieu (2017). "Removing Sun Glint from Optical Satellite Images of the Shallow Water Areas around Islands in the Spratly Islands Archipelago." VNU Journal of Science: Earth and Environmental Sciences Vol 33.3, pp.87-98.

[2] Yen, Phan Quoc, Dao Khanh Hoai, and Dinh Thi Bao Hoa (2017). "Research Bathymetry Mapping of Shallow Water Areas around Islands in the Truong Sa Archipelago by Deep-Remote sensing technology." VNU Journal of Science: Earth and Environmental Sciences Vol 33.4, pp. 63-73.

 [3] Yen, Phan Quoc and Hoai, Dao Khanh (2019). “Evaluates the possibility of shallow water bathymetry mapping using optical satellite imagery.” FIG Working Week 2019, Hanoi, Vietnam.

[4] Yen, Phan Quoc (2019), “Assessing the ability to determine the depth of shallow water areas around inaccessible islands by optical remote sensing data”, Journal of Science and Technique, Section on Special Construction Enginnering No. 02 Vol 200, pp. 64-74.

[5] Yen, Phan Quoc, Nguyen Thi Thu Nga, and Tong Thi Hanh (2019). "Research and Experimental Comparison of Topographic Modeling Methods." VNU Journal of Science: Earth and Environmental Sciences Vol 35.4, pp. 68-79.

[6] Yen Quoc Phan, Nga Thu Thi Nguyen (2020), “Experiment, evaluate methods of interpolation of terain surface for different types of terrain.” Journal of Mining and Earth Sciences Vol. 61, Issue 2, pp. 116 – 125.