Lysandros Tsoulos

Lysandros Tsoulos
National Technical University of Athens | NTUA · School of Surveying Engineering - Department of Topography

Prof. Dr.

About

114
Publications
41,647
Reads
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339
Citations
Additional affiliations
April 2017 - September 2021
National Technical University of Athens
Position
  • Professor Emeritus
December 2008 - present
Center for Coastal and Ocean Mapping / Joint Hydrographic Center
Position
  • Professor
January 1997 - August 2016
National Technical University of Athens
Position
  • Managing Director

Publications

Publications (114)
Article
Full-text available
Electronic navigational charts (ENCs) are specialised geospatial datasets, issued by or on the authority of a government or hydrographic office, in accordance with the International Hydrographic Organisation's (IHO) standards, specifications and symbol sets. The datasets generally comprise encoded information collected from hydrographic surveys, ai...
Article
Full-text available
Topographic maps show both physical and artificial entities of the surface of the Earth which represent distinct features forming the building blocks in map composition. Their portrayal on the map is subject to constraints dependent on the method of data collection, the map scale, the data processing procedures and the requirements of map users. In...
Article
Full-text available
This article elaborates on map-quality evaluation and assessment as a result of the generalization of geospatial data through the development of a methodology, which incorporates a quality data model including constraints. These constraints are used to guide the generalization process and they operate as requirements in quality controls applied for...
Article
Full-text available
Generalization of nautical charts and electronic nautical charts (ENCs) is a critical process which aims at the safety of navigation and clear cartographic presentation. This paper elaborates on the problem of depth contours and coastline generalization—natural and artificial—for mediumscale charts (harbour and approach) taking into account Interna...
Chapter
Full-text available
1:25.000 της χώρας. Τα βασικά πλεονε-κτήματα της κτηματολογικής πληροφορίας που διατίθεται είναι ότι καλύπτει το σύνολο της χώρας, επικαιροποιείται συνεχώς και έχει συνταχθεί σε ενιαίο γεωδαιτικό σύστημα αναφοράς. Στο πλαίσιο της εργασίας, αναλύονται και περιγράφονται τα στάδια που απαιτούνται για την παραγωγή του χάρτη και συγκεκριμένα: i. Σχεδιασ...
Article
Full-text available
his paper presents an integrated digital methodology for the generalization of soundings. The input for the sounding generalization procedure is a high resolution Digital Terrain Model (DTM) and the output is a sounding data set appropriate for portrayal on harbour and approach Electronic Navigational Charts (ENCs). The sounding generalization proc...
Chapter
This work addresses the 3D character of marine spaces and proposes the application of the Land Administration Domain Model (LADM conceptual standard ISO 19152) to specific jurisdictional MAS or MC, taking into account the S-121 Maritime Limits and Boundaries (MLB) Standard, which refers to LADM. Several modifications are proposed, including e.g., t...
Conference Paper
Full-text available
World Wide Web), τα δεδομένα στην κλασική Χαρτογραφία άλλαξαν. Πλέον υπάρχει η δυνατότητα παραγωγής χάρτη σε διαδικτυακό περιβάλλον. Βασική προϋπόθεση είναι η κατανόηση και εφαρμογή της αρχιτεκτονικής αυτού του περιβάλλοντος, καθώς μια χαρτογραφική διαδικτυακή εφαρμογή αποτελείται από ποικίλα συστατικά. Τα βασικότερα εξ αυτών είναι οι εξυπηρετητές...
Conference Paper
Full-text available
Ο γεωλογικός χάρτης αποτελεί ένα σύνθετο χαρτογραφικό προϊόν, που αποτυπώνει τη γεωλογική δομή/εικόνα μιας περιοχής μελέτης σε τέσσερις διαστάσεις (x, y, z και χρόνος) σε συνδυασμό με το τοπογραφικό υπόβαθρό της. Η εκπόνηση ενός γεωλογικού χάρτη ξεκινά με τη χαρτογράφηση πεδίου και τη λήψη δειγμάτων και ολοκληρώνεται με την επεξεργασία των δεδομένω...
Presentation
Full-text available
Ο τοπογραφικός χάρτης κλίμακας 1:25.000 αποτελεί ακριβή και λεπτομερή αναπαράσταση των αναγκαίων για τη συγκεκριμένη κλίμακα χαρτογραφικών χαρακτηριστικών και απεικονίζει την κατά τον χρόνο έκδοσής του κατάσταση της γήινης επιφάνειας, περιλαμβάνοντας ταυτόχρονα τα τοπωνύμια των βασικών τοποθεσιών και τα διοικητικά όρια. Αξιοποιείται κυρίως ως υλικό...
Conference Paper
Full-text available
An isochrone is defined as a polygon on the map that includes all the areas that are accessed within a certain amount of time from an initial point. The main objective of this study is the creation of maps that show curves of equal travel times through the Public Transit Network of Athens starting from Omonoia Square. We aim at realistic analysis r...
Article
Full-text available
All professions face challenges as how best to ensure the achievement and continuance of the highest standards as they seek to determine and promulgate best practices. In the essentially linked professions of hydrographic surveying and nautical cartography these challenges become immediately international in their impacts and require close cooperat...
Article
Full-text available
The delimitation of maritime zones and boundaries foreseen by the United Nations Convention on the Law of the Sea (UNCLOS) is a factor of economic growth, effective management of the coastal and ocean environment and the cornerstone for maritime spatial planning. Maritime zones and boundaries form the outermost limits of coastal states and their ac...
Article
Full-text available
Voronoi tessellation, and its dual the Delaunay triangulation, provide a cohesive framework for the study and interpretation of phenomena of geographical space in two and three dimensions. The planar and spherical solutions introduce errors in the positional accuracy of both Voronoi vertices and Voronoi edges due to errors in distance computations...
Conference Paper
Full-text available
The delimitation of maritime zones and boundaries foreseen by the United Nations Convention on the Law of the Sea (UNCLOS) is a factor of economic growth, effective management of the coastal and ocean environment and the cornerstone for maritime spatial planning. Maritime zones and boundaries form the outermost limits of coastal states and their ac...
Article
Full-text available
The interests, responsibilities and opportunities of states to provide infrastructure and resource management are not limited to their land territory but extend to marine areas as well. So far, although the theoretical structure of a Marine Administration System (MAS) is based on the management needs of the various countries, the marine terms have...
Conference Paper
Full-text available
All professions face challenges as how best to ensure the achievement and continuance of the highest standards as they seek to determine and promulgate best practices. In the essentially linked professions of hydro-graphic surveying and nautical cartography these challenges become immediately international in their impacts and require close coopera...
Conference Paper
Full-text available
The creation of the Mercator chart has been a milestone in nautical cartography, namely the composition and production of charts aiding mariners to safely navigate their vessels. The development and propagation of digital systems in the last decades of the 20th century, was instrumental for the collection and processing of data pertaining to the co...
Conference Paper
Full-text available
A huge immigration crisis has been unfolding in the Mediterranean region in recent years, forcing the countries involved to draw up agreements and take measures for the reception and prevention of immigration flows in the area. The study of information from the past decade shows that cooperation agreements among the states concerned contribute to t...
Conference Paper
Full-text available
Οι γεωλογικοί χάρτες αποτελούν θεματικούς χάρτες στους οποίους αποτυπώνονται λεπτομερώς σε τέσσερις διαστάσεις (x, y, z και χρόνος) το σύνολο των σημειακών, γραμμικών και επιφανειακών χωρικών στοιχείων που συνθέτουν τη γεωλογική εικόνα μιας συγκεκριμένης περιοχής μελέτης. Η αλματώδης ανάπτυξη της επιστήμης και της τεχνολογίας στους τομείς της διαχε...
Conference Paper
Full-text available
Ένα μεγάλο μέρος των χαρτών που συντάσσονται σήμερα προορίζονται για δημοσιοποίηση στο διαδίκτυο. Η αλλαγή αυτή, σε σχέση με τον παραδοσιακό στόχο που ήταν ο έντυπος χάρτης, επηρεάζει τη διαδικασία σχεδιασμού σε πρακτικό επίπεδο π.χ. νέες τεχνολογίες, λογισμικό και προγραμματιστικές τεχνικές. Η ανάγκη της χαρτογραφικής σύνθεσης να προσαρμοστεί στις...
Conference Paper
Full-text available
Η εργασία αναφέρεται στην ανάπτυξη διαδικτυακής εφαρμογής που πραγματοποιεί παραμετρικό σχεδιασμό ιστιοπλοϊκού πλου, με χρήση ανοικτού λογισμικού, εφαρμόζοντας σύγχρονες μεθόδους γεωπληροφορικής για μια πεπερασμένη θαλάσσια περιοχή ενδιαφέροντος με έντονα νησιωτικά συμπλέγματα, όπως αυτά της Ελλάδας. Η εφαρμογή επιτρέπει τον αυτόματο σχεδιασμό του...
Conference Paper
Full-text available
The interests, responsibilities and opportunities of states to provide infrastructure and resource management are not limited to their land territory but extend to marine areas as well. So far, although the theoretical structure of a Marine Administration System (MAS) is based on the management needs of the various countries, the marine terms have...
Article
The delimitation of maritime zones and boundaries foreseen by the United Nations Convention on the Law of the Sea is a factor of economic growth, effective management of the coastal and ocean environment and the cornerstone for maritime spatial planning. Maritime boundaries form the outermost limits of coastal states and their accurate computation...
Data
The graphic presents the result of the automatic delimitation of maritime limits and boundaries for a fictitious area.
Article
One of the fundamental concepts of the Convention on the Law of the Sea is that of the baselines, where from the breadth of the maritime zones is measured. Baselines, delimiting the land and internal waters from the sea, can be any combination of normal, straight, archipelagic or bay-closing lines. The determination of the coastline indentations at...
Book
Full-text available
Σκοπός του βοηθήματος είναι να καλύψει θέματα που προκύπτουν κατά τη σύνθεση ενός χάρτη σε ψηφιακό περιβάλλον, ο οποίος ενδέχεται να προορίζεται για έντυπη αναπαραγωγή, θέαση στην οθόνη είτε για δημοσιοποίηση στο διαδίκτυο. Καλύπτει τα ακόλουθα στάδια: • Σχεδιασμός και υλοποίηση χαρτογραφικής βάσης δεδομένων • Γεωαναφορά • Ψηφιακή καταγραφή γεωγραφ...
Conference Paper
Full-text available
This paper elaborates on the issue of quality assessment in model and cartographic generalization. Quality assessment is carried out through the development and implementation of a quality model overarch-ing these two processes. The proposed model constitutes a part of the ongoing research on the development of a comrehensive map/chart quality asse...
Conference Paper
Full-text available
Η Διαχείριση Ποιότητας αφορά ουσιαστικά την πρακτική του να διοικούνται οι οργανισμοί με βάση προσεγγίσεις πάνω στην ποιότητα, αναπτύσσοντας μια μεθοδολογία που αποβλέπει στην απόλυτη ικανοποίηση των χρηστών ενός προϊόντος μέσω συνεχών βελτιώσεων. Το υπόβαθρο για την αποδοτική Διαχείριση της Ποιότητας δημιουργείται μέσω της ανάπτυξης Συστημάτων Δια...
Conference Paper
Full-text available
This paper elaborates on the issue of map quality assessment through the design and implementation of a quality model that consists a part of the ongoing research on the development of a map quality evaluation methodology. The proposed quality model is described and analyzed especially for the generalization process. The main scope in quality model...
Conference Paper
Full-text available
Map quality refers to the overall characteristics of the map con-sidered as a communication and reference medium for measurement and decision making. The better the quality of the map/chart the more efficient its utilization by the users community will be. In map quality assessment the problem lies with the definition and quantification of the qual...
Article
Navigation at sea is based on Electronic Chart Display and Information Systems (ECDIS) that allow for the use of a limited number of projections. As navigation in the Arctic region becomes a reality due to the progressive melting of the polar ice cap, a re-examination of the most suitable projections for navigation in the Arctic becomes timely. Sev...
Conference Paper
Full-text available
The objective of this paper is to explore the development of a model for the quality assessment of road data. In order to assess spatial data quality, multilateral approach needs to be followed due to the varying needs of each data-user, the cost of data production and the different aspects of the data-specifications depending on different applicat...
Conference Paper
Full-text available
In map production, two factors are considered important in producing a map/chart according to the relevant specifications and the user’s needs. The use of spatial data of known quality and the quality control of the derived data in every phase of map composition process is indispensable. It is assumed that input data quality has been already assess...
Conference Paper
Full-text available
Τα χωρικά δεδοµένα, συµµετέχουν σε µεγάλο εύρος εργασιών των οποίων το πεδίο εφαρµογής συνεχώς διευρύνεται. Ως αποτέλεσµα του εύρους εφαρµογής τους, όλο και περισσότερο αυτά ανταλλάσσονται και χρησιµοποιούνται από µεγάλο αριθµό χρηστών και τις περισσότερες φορές για σκοπούς διαφορετικούς από αυτούς για τους οποίους δηµιουργήθηκαν. Για τη δηµιουργία...
Presentation
Full-text available
Cultural Heritage is formed by all material and immaterial evidence of the cultural identity of a population. The safeguard of all “objects” of Cultural Heritage requires a structural digital recording that will enable - besides its transmission to the future - its utilization by the society and for scientific analysis. This can only be achieved th...
Conference Paper
Full-text available
The growing use of digital spatial data bases in conjunction with the growing ability of handling large volumes of information via the Internet, multiplied the transfer and exchange of information between users. Spatial data is now addressed in an extended circle of potential users, who in order to assess whether and how the available data meet the...
Technical Report
Full-text available
Spatial data is data representing real world phenomena where the geographical positions of the phenomena are important. A quality model for spatial data handles the differences between the dataset and the Universe of Discourse (UoD: the perfect dataset that corresponds to the specifications of the dataset), how these differences can be characterize...
Article
Full-text available
This paper, published in Coordinates Vol. VI, Issue 5, May 2010 is an abridged version of the original version presented in the European Navigation Conference ENS-GNSS 2009 (4-6 May 2009) and published in the ENC-GNSS Proceedings. The paper presents new algorithms for rhumbline sailing (RLS) and great elliptic sailing (GES) calculations for route p...
Article
Full-text available
This paper, published in Coordinates Vol. VI, Issue 5, May 2010 is an abridged version of the original version presented in the European Navigation Conference ENS-GNSS 2009 (4-6 May 2009) and published in the ENC-GNSS Proceedings. The paper presents new algorithms for rhumbline sailing (RLS) and great elliptic sailing (GES) calculations for route p...
Conference Paper
Full-text available
Since the invention of Geographic Information Systems huge amounts of spatial data have been produced and made available by the public and private sectors. In the early steps of this activity the problem was that there was not sufficient data available to accommodate the wide variety of needs of the users’ community. Nowadays the problem is the opp...
Conference Paper
Full-text available
The purpose of this paper is twofold: firstly to present the current status and the weaknesses of the standards of the International Maritime Organization (IMO) on the employment of map projections in Electronic Chart Display and Information Systems (ECDIS) and other Electronic Chart Systems (ECS), and secondly to propose map projections and rules...
Conference Paper
Full-text available
Currently across Europe, NSDIs are at varying stages of development, data is held in a variety of coordinate reference systems and varies in quality, coverage, content and structure. Quality can be defined as fitness for use, including quality of design, conformance to the design (production oriented quality), customer satisfaction and the fulfilme...
Conference Paper
The Directive 2007/2/EC of the European Parliament and of the Council - adopted on 14 March 2007 - aims at establishing an Infrastructure for Spatial Information in the European Community (INSPIRE) for environmental policies, or policies and activities that have an impact on the environment. INSPIRE will be based on the Member States’ infrastructur...
Conference Paper
Full-text available
This paper presents analytical methods and algorithms for the execution of accurate sailing calculations in a GIS environment (ECDIS and ECS), and in typical navigational receivers.
Article
Full-text available
This paper presents simple contact formulas for the computation of the length of the meridian arc. The proposed alternative formulas are to be primarily used for accurate sailing calculations on the ellipsoid in a GIS environment as in ECDIS and other ECS. Their validity and effectiveness in terms of the accuracy achieved and the CPU time required...
Conference Paper
Full-text available
The development of Spatial Data Infrastructures – SDIs at national level in the framework of the INSPIRE initiative, is a reality and a must for the European Union member states. SDIs support the storage, updating and dissemination of spatial data and are designed to support the location and exchange of data among the producing organizations and th...
Chapter
Full-text available
Ο ΓΕΩΤΟΠΟΣ είναι το αποτέλεσμα ερευνητικής δράσης στη Σχολή Αγρονόμων Τοπογράφων Μηχανικών (ΣΑΤΜ) του Εθνικού Μετσόβιου Πολυτεχνείου (ΕΜΠ), η οποία αποσκοπεί στη σταδιακή υλοποίηση ενός νέου “μαθησιακού περιβάλλοντος” βασισμένου στις ψηφιακές τεχνολογίες και στα δίκτυα επικοινωνίας. Το περιβάλλον αυτό θα παρέχει ποικιλόμορφο διδακτικό ψηφιακό υλικό...
Conference Paper
Full-text available
This paper presents a comparative study of several simplification algorithms and their influence on two elements inherent to linear features: shape and horizontal position. Algorithms, which use different criteria for vertex elimination, are applied to lines with different shape complexity, using a range of tolerance values to produce generalizatio...
Conference Paper
Full-text available
This paper elaborates on the way quality should be taken into account in the development of Spatial Data Infrastructures (SDIs). A variety of quality concepts are described using four quality management viewpoints, i.e. a production-centred, planning-centred, customer-centred and a system-centred perspective. All views are argued to be important fr...
Conference Paper
Full-text available
Η «πανταχού παρούσα χαρτογραφία» καλείται να συμβάλλει καθοριστικά στη σχεδί- αση κινητών συστημάτων χαρτογραφικών πληροφοριών. Τα συστήματα αυτά θα πρέπει να λειτουργήσουν αποδοτικά και αποτελεσματικά, οικονομικά και ανθρωποκεντρικά σε ευρύτερο και πλέον απαιτητικό περιβάλλον. Σημαντική πρόκληση στη σχεδίαση συστη- μάτων της κατηγορίας αυτής αποτε...
Conference Paper
Full-text available
Η χαρτογραφία μέσω δικτύων, αποτελεί το υποχρεωτικό σημείο διαβάσεως της επι- στήμης της Χαρτογραφίας από την κατάσταση του παραδοσιακού χάρτη προς μια κοινω- νία στην οποία η γεωγραφική πληροφορία θα είναι προσβάσιμη από τον τελικό χρήστη ανεξαρτήτως χώρου και χρόνου. Θέτοντας τον παραπάνω στόχο και συνυπολογίζοντας το σημαντικό παράγοντα της διαλ...
Article
The evolution of open standards and especially those pertaining to the family of XML technologies, have a considerable impact on the way the Geomatics community addresses the acquisition, storage, analysis and display of spatial data. The most recent version of the GML specification enables the merging of vector and raster data into a single “open”...
Article
In the recent history of cartography, atlases deserve a prominent status among cartographic products due to the variety of their thematic content, the rather friendly appearance and their utilization by a wide spectrum of users. Advances in information technology, and more specifically in geographic information systems and digital mapping, have alt...
Article
Full-text available
The objective of this paper is to show the way multiple source data like aerial photos, maps and descriptive information are combined and amalgamated to form an Internet or Intranet application. The visual outcome is a large scale, precise and detailed image/map displaying the interiors of buildings in a layered fashion, enabling the user to intera...