Unit:
Κατεύθυνση Γεωγραφία και ΠεριβάλλονLibrary of the School of Science
Author:
Mavraeidopoulos Athanasios
Dissertation committee:
Σεραφείμ Πούλος, Καθηγητής ΕΚΠΑ
Αθανάσιος Παλληκάρης, Καθηγητής ΣΝΔ
Εμμανουήλ Οικονόμου, Επίκουρος Καθηγητής Παν/μιου Δυτικής Αττικής
Πάνος Δρακόπουλος, Καθηγητής Παν/μιου Δυτικής Αττικής
Νικολέττα Ευελπίδου, Καθηγήτρια ΕΚΠΑ
Κωνσταντίνος Νικολακόπουλος, Αναπληρωτής Καθηγητής Παν/μιου Πατρών
Εμμανουήλ Βασιλάκης, Επίκουρος Καθηγητής ΕΚΠΑ
Original Title:
«Διερεύνηση και μελέτη ακρίβειας και αξιοπιστίας της εφαρμογής μεθοδολογιών για την εξαγωγή βαθυμετρίας από την επεξεργασία πολυφασματικών εικόνων, σε παράκτια ύδατα, για την υποστήριξη της ασφάλειας ναυσιπλοΐας»
Translated title:
"Investigation and study on the accuracy and reliability of the application of the satellite-derived bathymetry using multi-spectral imagery in coastal waters for the safety of Navigation"
Summary:
In this PhD dissertation the results of the investigation and exploitation of a new method of analysis and processing of the Passive Multispectral Imagery are presented for the extraction of Bathymetry. The aim is to exploit the new satellite derived bathymetry model in the production process of nautical charts and other maritime publications.
Initially, the subject of the dissertation was the "Study of Bathymetry and the coastal engineering characteristics of Evoikos Gulf by using data from various sources of remote sensing and development of appropriate software for better exploitation of the data" (NKUA / Geology / Prot. 1096 // 27.06.2000). Subsequently, by a decision of the General Assembly of Special Composition of the Department of Geology and Geo-environment, at its meeting on 08.02.2016, two (2) of the three (3) members of the Committee were replaced and the subject was modified as follows: "Investigation and study on the accuracy and reliability of the application of the satellite-derived bathymetry using multi-spectral imagery in coastal waters for the safety of Navigation". The last change in the composition of the Three-member Committee was made in accordance with a decision of the Assembly of the Department of Geology and Geoenvironment, received at its 15th meeting, held on 19.04.2019, which replaced the late Supervisor Emeritus Professor Dimitrios Vaiopoulos, by Professor of National and Kapodistrian University of Athens Serafim Poulos.
In the present study, the spectral effect of the marine waters of specific study areas on the entire coastal zone (shore, coastal / marine / deep water) geomorphology of the coastal zone has been investigated, evaluated and exploited, which influences the accuracy of the results of the bathymetry models. The derivation (determination) of bathymetry data from the new model must be possible irrespective of the spatial variation of the Water Color Reflectance, Seabed Reflectance, and Atmospheric Conditions prevailing in each study area.
In addition, based on the results of the assessment of this dissertation the new bathymetric model / algorithm developed, tries to ask questions such as: (1) if the bathymetry calculated by the model / algorithm created in the present study, can be used for purposes of nautical cartography, and if this the case what is the accuracy achieved or which are the hydrographic categories or specifications that can be satisfied according to the standards of the International Hydrographic Organization (IHO, S-44). (2) How and under what conditions the bathymetry data from the analysis of satellite imagery can contribute to the faster updating of the different categories of printed or electronic nautical charts.
On the basis of the above and after a large number of experiments and tests it is estimated that the extracted (modelled) bathymetric data from the new model (Hybrid model) developed in this PhD thesis can be used in addition to the other hydrographic data in the cartographic process of the production of the printed and electronic nautical charts. It has also been found that this is a technique that can cope with the current difficulties in rapid collection of bathymetric data, as it can contribute to the short completion, production and updating of nautical charts.
Finally, it was confirmed that the cartographic exploitation of the method investigated in this PhD thesis can save resources (human resources, time, and financial expenses) to be made available by the competent bodies in other actions or to perform other work in the field where more accuracy is required in bathymetric data collection.
Main subject category:
Science
Keywords:
Bathymetry, Hydrography, Remote Sensing of Coastal Waters, Safety of Navigation, International Standards for Hydrographic Surveys, Classification, Satellite Derived Bathymetry Models.
Number of references:
115
