Michail Vaitis | University of the Aegean (original) (raw)
Uploads
Papers by Michail Vaitis
Journal of Network and Computer Applications, 2003
Springer eBooks, 1996
ABSTRACT This paper presents a methodology for constructing hypertext views over existing relatio... more ABSTRACT This paper presents a methodology for constructing hypertext views over existing relational databases. First, the database semantics are extracted in the form of an EER schema, using database reverse engineering techniques. Then, the EER schema is used for the definition of the node and link types of hypertext views. This two-stage approach has the benefit that the hypertext designer considers only a conceptual model of the database. Moreover, the instances of node and link types are dynamically computed; no data replication takes place. An experimental set of tools that support the methodology has been developed and used in a realistic case study.
EGU General Assembly Conference Abstracts, Apr 1, 2016
Springer eBooks, 2005
ABSTRACT Geoportals (geographic portals) are entry points on the Web, where various geographic in... more ABSTRACT Geoportals (geographic portals) are entry points on the Web, where various geographic information resources can be easily discovered. They organize geospatial data and services through catalogs containing metadata records, which can be queried in order to give access to related resources. However, the current organization of geographic information in metadata catalogs is unable to capture the semantics of the data being described; therefore users often miss geographical resources of interest when searching for geospatial data in the World Wide Web. In this paper, we present an innovative approach in the development of geoportals, based on the next generation of the Web, called the Semantic Web. This approach relies in the organization of the geo-data at the semantic level through appropriate geographic ontologies, and the exploitation of this organization through the user interface of the geoportal. To the best of our knowledge, this approach is the first that combines the expressiveness of geo-ontologies in the context of geographic portals.
Natural Hazards and Earth System Sciences, Dec 5, 2011
Computers & Geosciences, Feb 1, 2009
Journal on Data Semantics, Dec 1, 2020
Lecture notes in geoinformation and cartography, 2006
ABSTRACT Despite the evolving technological developments that have influenced spatial information... more ABSTRACT Despite the evolving technological developments that have influenced spatial information management and communication, digital cartography has to overcome a number of issues concerning cognition and usability. Hypermaps, integrating concepts from geographical information systems and hypermedia systems, have been proposed by many researchers as a promising solution. However, these systems are isolated, without making an attempt for information and services exchange. In this chapter, inspired by previous work on Open Hypermedia Systems, we propose a conceptual reference model for cartographic hypermedia services. As a prerequisite, a number of hypermap systems have been studied, resulting in a set of indispensable requirements.
Lecture Notes in Computer Science, 2004
Earth Science Informatics, Jun 26, 2018
Lecture Notes in Computer Science, 2000
... Michalis Vaitis1,2, Athanasios Papadopoulos1,2, Manolis Tzagarakis1,2, and Dimitris Christodo... more ... Michalis Vaitis1,2, Athanasios Papadopoulos1,2, Manolis Tzagarakis1,2, and Dimitris Christodoulakis1,2 ... The well-known and very important hypermedia domains (navigational, taxonomic, spatial, etc.) are just instances of an un-restricted space of relationship types. ...
Review of International Geographical Education Online, 2017
Island studies journal, May 1, 2017
Springer eBooks, Jun 1, 2012
Journal of Network and Computer Applications, 2003
Springer eBooks, 1996
ABSTRACT This paper presents a methodology for constructing hypertext views over existing relatio... more ABSTRACT This paper presents a methodology for constructing hypertext views over existing relational databases. First, the database semantics are extracted in the form of an EER schema, using database reverse engineering techniques. Then, the EER schema is used for the definition of the node and link types of hypertext views. This two-stage approach has the benefit that the hypertext designer considers only a conceptual model of the database. Moreover, the instances of node and link types are dynamically computed; no data replication takes place. An experimental set of tools that support the methodology has been developed and used in a realistic case study.
EGU General Assembly Conference Abstracts, Apr 1, 2016
Springer eBooks, 2005
ABSTRACT Geoportals (geographic portals) are entry points on the Web, where various geographic in... more ABSTRACT Geoportals (geographic portals) are entry points on the Web, where various geographic information resources can be easily discovered. They organize geospatial data and services through catalogs containing metadata records, which can be queried in order to give access to related resources. However, the current organization of geographic information in metadata catalogs is unable to capture the semantics of the data being described; therefore users often miss geographical resources of interest when searching for geospatial data in the World Wide Web. In this paper, we present an innovative approach in the development of geoportals, based on the next generation of the Web, called the Semantic Web. This approach relies in the organization of the geo-data at the semantic level through appropriate geographic ontologies, and the exploitation of this organization through the user interface of the geoportal. To the best of our knowledge, this approach is the first that combines the expressiveness of geo-ontologies in the context of geographic portals.
Natural Hazards and Earth System Sciences, Dec 5, 2011
Computers & Geosciences, Feb 1, 2009
Journal on Data Semantics, Dec 1, 2020
Lecture notes in geoinformation and cartography, 2006
ABSTRACT Despite the evolving technological developments that have influenced spatial information... more ABSTRACT Despite the evolving technological developments that have influenced spatial information management and communication, digital cartography has to overcome a number of issues concerning cognition and usability. Hypermaps, integrating concepts from geographical information systems and hypermedia systems, have been proposed by many researchers as a promising solution. However, these systems are isolated, without making an attempt for information and services exchange. In this chapter, inspired by previous work on Open Hypermedia Systems, we propose a conceptual reference model for cartographic hypermedia services. As a prerequisite, a number of hypermap systems have been studied, resulting in a set of indispensable requirements.
Lecture Notes in Computer Science, 2004
Earth Science Informatics, Jun 26, 2018
Lecture Notes in Computer Science, 2000
... Michalis Vaitis1,2, Athanasios Papadopoulos1,2, Manolis Tzagarakis1,2, and Dimitris Christodo... more ... Michalis Vaitis1,2, Athanasios Papadopoulos1,2, Manolis Tzagarakis1,2, and Dimitris Christodoulakis1,2 ... The well-known and very important hypermedia domains (navigational, taxonomic, spatial, etc.) are just instances of an un-restricted space of relationship types. ...
Review of International Geographical Education Online, 2017
Island studies journal, May 1, 2017
Springer eBooks, Jun 1, 2012
Η δημιουργία του Άτλαντα των Ελλη- νικών νησιών αποτελεί έναν στόχο που τέθη- κε από την εποχή τη... more Η δημιουργία του Άτλαντα των Ελλη-
νικών νησιών αποτελεί έναν στόχο που τέθη-
κε από την εποχή της δημιουργίας του Εργα-
στηρίου Τοπικής και Νησιωτικής Ανάπτυ-
ξης to 1992 αφού θεωρήθηκε ότι η σοβαρή
ενασχόληση με τα νησιά απαιτεί από τη μία
πλευρά τη θεωρητική τεκμηρίωση των ιδι-
αιτεροτήτων του νησιωτικού χώρου και των
πολιτικών εκείνων που μπορούν να αντιμε-
τωπίσουν τα προβλήματα που πηγάζουν από
τα χαρακτηριστικά αυτά αξιοποιώντας τις
σύγχρονες ευκαιρίες και προκλήσεις και από
την άλλη πλευρά τη συστηματική τεκμηρίω-
ση με δεδομένα σε ότι αφορά τα φυσικά χα-
ρακτηριστικά των νησιών, τις κοινωνικοοι-
κονομικές εξελίξεις αλλά και τη κατάσταση
του περιβάλλοντος. Έγιναν πολλές προσπά-
θειες στο παρελθόν μέσα από τη συμμετοχή
σε διάφορα δίκτυα και προγράμματα όπως
το EURISLES τη δεκαετία του ’90 και το EUROISLANDS
πριν μερικά χρόνια.
Το πρόγραμμα «Το Πανεπιστήμιο Αι-
γαίου, ως βασικός παράγοντας για την οικο-
νομική και κοινωνική ανάπτυξη του Αιγαιο-
πελαγίτικου χώρου» του Υπουργείου Εθνικής
Παιδείας και Θρησκευμάτων με τη χρημα-
τοδότηση της προσπάθειας να καταστεί το
Πανεπιστήμιο Αιγαίου διεθνές κέντρο αρι-
στείας στα θέματα νησιωτικότητας μέσα από
τη σύνδεση της έρευνας με την εκπαίδευση
και τη διεθνή κοινότητα, έδωσε έμφαση σε
δύο ενέργειες:
1. Τη συγκέντρωση και ανάλυση της βι-
βλιογραφίας στα βασικά θέματα που
απασχολούν τα νησιά με τη δημιουρ-
γία ενός ηλεκτρονικού αποθετηρίου
(www.archipelago.aegean.gr)
2. Τη δημιουργία του Άτλαντα των Ελληνι-
κών Νησιών
Το έντυπο που έχετε σήμερα στα χέρια
σας αποτελεί μια προσπάθεια για μια πρώτη
έντυπη συστηματική αποτύπωση των βασι-
κών θεμάτων που απασχολούν τα νησιά με
δεδομένα, πίνακες, χάρτες και αναλύσεις.
Όμως ο Άτλαντας δεν σταματά εδώ, εδώ αρ-
χίζει. Η δημιουργία του Άτλαντα βασίζεται σε
μια βάση δεδομένων που για να παραμείνει
χρήσιμη πρέπει να ενημερώνεται διαρκώς
και να προχωρά σε επικαιροποίηση των ανα-
λύσεων. Ο Άτλαντας δεν φιλοδοξεί να υπο-
καταστήσει την Ελληνική Στατιστική Αρχή.
Βασίζεται στα στοιχεία που αυτή παράγει
κάτω από μία κλαδική λογική για να παράξει
χωρική πληροφορία για μια ιδιόμορφη και
πολλές δυσκολίες περιοχή όπως είναι τα νη-
σιά.
Γ.Σπιλάνης
Θ.Κίζος
This article presents a geocaching educational system called RouteQuizer that consists of an Andr... more This article presents a geocaching educational system called RouteQuizer that consists of an Android application, a web application and an online database. It motivates students to visit various geographic points of interest and answer site-related questions of multiple choice type. The android application used by the students, takes advantage of the navigation (GPS) and internet connectivity features of their smartphones. The web application is used by tutors, to create dynamic location-based educational games for their students. The database stores data such as site information and coordinates, questions and answers regarding the area of interest, as well as students' performance results. There are no geographical restrictions and no limits regarding the number of destinations, thus making the application usable from everyone everywhere.