Lemonia Ragia

Lemonia Ragia
Technical University of Crete | TUC · Department of Architectural Engineering

About

46
Publications
13,371
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276
Citations
Introduction

Publications

Publications (46)
Article
Full-text available
In recent years, advances in computer hardware, graphics rendering algorithms and computer vision have enabled the utilization of 3D building reconstructions in the fields of archeological structure restoration and urban planning. This paper deals with the reconstruction of realistic 3D models of buildings façades, in the urban environment for cult...
Article
Full-text available
Climate change is undoubtedly a big issue due to its devastating consequences. The enhanced resilience to natural hazards due to climate change belongs to the concept of smart cities. This Editorial proposes different uses of Geographic Information Systems to handle and disseminate data for natural disasters. Data are gathered from various data sou...
Chapter
The aim of the current work is to introduce bathymetry data into Geographic Information Systems tools for mapping, monitoring and assessing the geohazards in the Greek islands between Crete and Kasos at the Mediterranean sea. The offshore area lying east of Crete is studied on the basis of new bathymetric data. The data was obtained by a multibeam...
Article
Full-text available
Story maps are used as an interactive tool for communication and information dissemination. A web-based application using story mapping technology is presented to explore the Methana peninsula. This volcanic area is characterized by specific volcanic geoforms, unique flora and rich history. The story map combines maps, narrative texts and multimedi...
Article
Full-text available
In this paper, we present the software architecture of a complete mobile tourist guide for cultural heritage sites located in the old town of Chania, Crete, Greece. This includes gamified components that motivate the user to traverse the suggested interest points, as well as technically challenging outdoors augmented reality (AR) visualization feat...
Article
Full-text available
Coastal areas are quite fragile landscapes as they are among the most vulnerable to climate change and natural hazards. Coastline mapping and change detection are essential for safe navigation, resource management, environmental protection, and sustainable coastal development and planning. In this paper, we proposed a new methodology for the automa...
Article
Full-text available
3D building façade reconstruction has become a very popular topic in various applications related to restoration and preservation of architectural structures as well as urban planning. This paper deals with the reconstruction of realistic 3D models of buildings façades, in the urban environment for cultural heritage. We present an approach that ena...
Article
Full-text available
This paper puts forward a 3D reconstruction methodology applied to the restoration of historic buildings taking advantage of the speed, range and accuracy of a total geodetic station. The measurements representing geo-referenced points produced an interactive and photorealistic geometric mesh of a monument named ‘Neoria.’ ‘Neoria’ is a Venetian bui...
Conference Paper
3D Building facade reconstruction enables the implementation of delicate actions related to restoration, support and presentation of architectural structures. In particular, model complexity can be significantly reduced through the incorporation of computer vision and image processing tools, aiming towards the estimation of structural 3D feature ch...
Conference Paper
Full-text available
Nowadays coastline extraction and tracking of its changes become of high importance because of the climate change, global warming and rapid growth of human population. Coastal areas play a significant role for the economy of the entire region. In this paper we propose a new methodology for automatic extraction of the coastline using aerial images....
Article
Full-text available
Nowadays coastline extraction and tracking of its changes become of high importance because of the climate change, global warming and rapid growth of human population. Coastal areas play a significant role for the economy of the entire region. In this paper we propose a new methodology for automatic extraction of the coastline using aerial images....
Conference Paper
Spatial information delivery is of high importance today for mobile applications. Knowledge about spatial objects includes not only location of the user, direction and time, but also knowledge of the semantics of the spatial objects. These semantics can be related to the user profile and user's interests at the time, which can be expressed using do...
Conference Paper
This paper puts forward a 3D reconstruction methodology applied to the restoration of historic buildings taking advantage of the combined speed, range and accuracy of a total geodetic station. The measurements of geo-referenced points produced a fully interactive and photorealistic geometric mesh of an historic monument named ‘Neoria’. ‘Neoria’ is...
Conference Paper
Full-text available
Conceptualization of information allows improved visualization and manipulation of large amounts of data. Especially in digitization of cultural heritage and when aiming at presenting more than one monuments, abstraction of information becomes the key solution. Our proposed application aims to present the main archaeological monuments of Crete thro...
Conference Paper
Full-text available
We describe SPIM (Spatial Image Management), a framework and a system that allow identification and visualization of the semantics of distant objects in nature, which exist in pictures taken by mobile devices. Semantic objects in nature are represented on 3D maps and tagged with semantic and spatial descriptors. The system functionality creates, on...
Conference Paper
Full-text available
Capturing Multimedia Events such as natural disas- ters, accident reports, building damage reports, political events, etc., are expensive functionalities due to the number and training of the people required, as well as the time involved in the captur- ing and post-processing of multimedia. In addition, the captured multimedia content often fails t...
Article
Full-text available
Spatial data are used for location based services and to support traffic management systems. Data are gathered, saved and managed in a central database where, in principal, every user can access them putting data in a temporary database and then integrate them to a central. The proposed system uses a connection between database and trust engines in...
Article
A sensor-based camera system associates picture contents with the captured environment to enable semantic content retrieval, interaction, and visualization.
Chapter
Full-text available
The goal of the present chapter is to provide location-based services for disaster management. The application involves services related to the safety of the people due to an unexpected event. The current prototype is implemented for a specific issue of disaster management which is road traffic control. The users can ask requests on cell phones or...
Conference Paper
The recent years mobile multimedia information gain considerable demand. We propose a model which can be easily addressed in different, interesting applications. In this paper we describe two applications more detailed in order to demonstrate functionality and usefulness of our model. The basic component is the description of real world events and...
Article
Cameras can provide integrated GPS and compass technology which makes them a powerful sensor for geographical context related images. They allow wireless connection to computers and the images can be automatically transferred to a PC or can be integrated into a GIS system. In this paper, we present an approach for personalised spatial information r...
Article
Full-text available
This paper presents an approach for forecasting environmental data for location based services. The environment becomes a very important issue and especially people with health problems need more information and support in their daily life. In this work we propose a system for making predictions for spatial-temporal variables using the Bayesian Net...
Conference Paper
Cameras provide integrated GPS technology which makes them a powerful sensor for geographical context related images. They allow wireless connection to computers and the images can be automatically transferred to a PC or can be integrated into a GIS system. In this paper we propose an approach for spatial information retrieval from images using the...
Conference Paper
Modern cameras are powerful devices that can interoperate using international standards with other sensors that can capture the context of each picture taken. Future cameras are expected to integrate such sensors within them. The contextual parameters captured can be interpreted with the help of semantic maps which are maps that integrate semantic...
Article
In this paper we propose a method based on machine learning to extract rules from spatial databases and to import them in a readable form in a GIS. We use the Web Ontology Language (OWL) as a special language for semantic information and the Resource Description Framework Language (RDF) for rules representation and for making them available via the...
Conference Paper
We explore the application of Spatial Data Mining, the partially automated search for hidden patterns in georeferenced databases, to the analysis of ecological data. A version of the subgroup mining algorithm is described that searches for deviation patterns directly in a spatial database, automatically incorporating spatial information stored in a...
Article
This paper presents a concept for analysing the quality of 2 1 2 -D spatial objects. The developed method is based on the evaluation of specific quality parameters. These parameters are determined by a topological and geometrical analysis. The quality parameters are classified into three categories: green=accepted, yellow=uncertain, red=rejected, d...
Article
A Semi-Automatic Building Extraction system using two or more digitized overlapping aerial images has been enhanced by increased automation for the measurement of saddle-back-roof buildings, hip-roof buildings and boxes. All newly developed modules have been incorporated in the object oriented design of the system. The new methods consist of a grou...
Article
The paper develops an approach for assessing the quality of ground plans of buildings. Quality is measured not only by geometrical but also by structural differences between an acquired data set and a reference data set. New hybrid techniques for automatically determining quality measures are developed, and shown to be applicable to real data. The...
Article
In this paper we present a quality evaluation of two-dimensional building acquisition. We propose methods for identification and quantification of differences between independently acquired regions, and we present a systematic classification of those differences. Differences between acquired sets of regions depend on the context of observation, on...
Conference Paper
Full-text available
Integration and interoperability is a basic requirement for geographic information systems (GIS). The web provides access to geographic data in several ways: on the one hand, web-based interactive GIS applications provide maps and routing information to end users; on the other hand, the data of some GIS can be accessed in a programmatic way using a...

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Project (1)