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  • Ioannis Giannopoulos
Ioannis Giannopoulos

Ioannis Giannopoulos
TU Wien | TU Wien · Department of Geodesy and Geoinformation

Dr. sc. ETH Zürich

About

52
Publications
18,113
Reads
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859
Citations
Additional affiliations
January 2012 - present
ETH Zurich
Position
  • Researcher
January 2012 - December 2015
ETH Zurich
Position
  • PhD Student
Education
January 2012
ETH Zurich
Field of study
  • Geoinformation Engineering
October 2009 - June 2011
Universität des Saarlandes
Field of study
  • Computer Science
October 2006 - September 2009
Universität des Saarlandes
Field of study
  • Computer Science

Publications

Publications (52)
Article
Full-text available
Geospatial vector data with semantic annotations are a promising but complex data source for spatial prediction tasks such as land use and land cover (LULC) classification. These data describe the geometries and the types (i.e., semantics) of geo-objects, such as a Shop or an Amenity. Unlike raster data, which are commonly used for such prediction...
Article
Full-text available
The classification of land use and land cover (LULC) is a well-studied task within the domain of remote sensing and geographic information science. It traditionally relies on remotely sensed imagery and therefore models land cover classes with respect to their electromagnetic reflectances, aggregated in pixels. This paper introduces a methodology w...
Article
Full-text available
Despite the increased research interest in wayfinding assistance systems, research on the appropriate point in time or space to automatically present a route instruction remains a desideratum. We address this research gap by reporting on the results of an outdoor, within-subject design wayfinding study (N=52). Participants walked two different rout...
Article
Full-text available
During spatial decision making, the quality of the utilized data is of high importance. During navigation these decisions are crucial for being routed to the desired destination (usually going by the shortest or fastest route). Road networks, the main data source for routing, are prone to changes which can have a big impact on the computed route an...
Article
Full-text available
A problem with 3D models is that devices used to display them are typically two-dimensional, i.e., computer monitors or printed maps. User interfaces of computer software are based on mouse, touchscreen, keyboards, etc. and are optimized for this dimensionality. However, this causes problems when working with 3D models and the user must adapt her a...
Article
This work addresses recent research in the area of pedestrian navigation aids that aims at finding alternatives to the widely used map-based turn-by-turn navigation systems in the context of Smart City environments. Four different approaches of pedestrian navigation systems were compared to each other in a user experiment that was conducted in a vi...
Article
Full-text available
This paper presents Human-Computer Interaction design guidelines for interactive wayfinding assistance systems which provide on-line route instructions. These design suggestions are based on a corpus of human-to-human, on-line, landmark-based route instructions in German language which were gathered by means of an in-situ study involving pairs of p...
Article
Full-text available
Urban growth is a spatial process which has a significant impact on the earth’s environment. Research on predicting this complex process makes it therefore especially fruitful for decision‐making on a global scale, as it enables the introduction of more sustainable urban development. This article presents a novel method of urban growth prediction....
Chapter
A basic problem in navigation is the selection of a suitable route. This requires a determination of costs or suitability. There are approaches for many standard situations, e.g., the shortest route for pedestrians, the fastest route for cars, a physically possible and legal route for trucks, or the safest route for bicycle riders. However, not muc...
Article
Full-text available
Human self-localisation is an important part of everyday life. In order to determine one’s own position and orientation, the allocentric representation, usually in the form of a map, has to be aligned with one’s own egocentric representation of the real world. This requires objects (anchor points) that are present in both representations. We presen...
Article
Full-text available
Volunteered Geographic Information (VGI) has been a constantly growing field over the last decade, but the utilised technologies (i.e., mobile phones) are not able to exploit the full potential concerning effort and accuracy of registering geographic data. This paper introduces the GeoAR Glasses, a novel technology enabling the use of Geographic-Aw...
Article
Full-text available
Location Based Services (LBS) are definitely very helpful for people that interact within an unfamiliar environment, but also for those that already possess a certain level of familiarity with it. In order to avoid overwhelming familiar users with unnecessary information, the level of details offered by the LBS shall be adapted to the level of fami...
Article
Flying an aircraft is a mentally demanding task where pilots must process a vast amount of visual, auditory and vestibular information. They have to control the aircraft by pulling, pushing and turning different knobs and levers, while knowing that mistakes in doing so can have fatal outcomes. Therefore, attempts to improve and optimize these inter...
Conference Paper
Full-text available
As maps are visual representations of spatial context to communicate geographic information, analysis of gaze behavior is promising to improve map design. In this research we investigate the impact of map task complexity and different legend types on the visual attention of a user. With an eye tracking experiment we could show that the complexity o...
Conference Paper
Full-text available
The importance of spatial data for the area of human-computer interaction is discussed in this vision paper as well as how machine learning and spatial big data can be utilized for optimizing and adapting the interaction modalities in outdoor spaces. This paper briefly introduces and tries to connect previous work in order to highlight the vision t...
Conference Paper
Full-text available
Complex information visualizations, such as thematic maps, encode information using a particular symbology that often requires the use of a legend to explain its meaning. Traditional legends are placed at the edge of a visualization, which can be difficult to maintain visually while switching attention between content and legend. Moreover, an exten...
Conference Paper
A novel eye-tracked measure of the frequency of pupil diameter oscillation is proposed for capturing what is thought to be an indicator of cognitive load. The proposed metric, termed the Index of Pupillary Activity, is shown to discriminate task difficulty vis-a-vis cognitive load (if the implied causality can be assumed) in an experiment where par...
Conference Paper
Full-text available
There are several situations where the type of a street intersections can become very important, especially in the case of navigation studies. The types of intersections affect the route complexity and this has to be accounted for, e.g., already during the experimental design phase of a navigation study. In this work we introduce a formal definitio...
Chapter
Full-text available
During pedestrian navigation in outdoor urban environments we often utilize assistance systems to support decision-making. These systems help wayfinders by providing relevant information withing the context of their surroundings, e.g., landmark-based instructions of the type "turn left at the church". Next to the instruction type and content, also...
Article
Full-text available
A model of the main sequence is proposed based on the logistic function. The model’s fit to the peak velocity-amplitude relation resembles an S curve, simulta- neously allowing control of the curve’s asymptotes at very small and very large amplitudes, as well as its slope over the mid amplitude range. The proposed inverse-linear logistic model is a...
Article
Full-text available
Adaptive map interfaces have the potential of increasing usability by providing more task dependent and personalized support. It is unclear, however, how map adaptation must be designed to avoid a loss of control, transparency, and predictability. This article investigates the user experience of adaptive map interfaces in the context of gaze-based...
Article
Location-Based Services (LBS) provide more useful, intelligent assistance to users by adapting to their geographic context. For some services that context goes beyond a location and includes further spatial parameters, such as the user's orientation or field of view. Here, we introduce Gaze-Informed LBS (GAIN-LBS), a novel type of LBS that takes in...
Article
Pedestrian navigation assistance is often utilized in familiar as well as in unfamiliar environments. In recent years, several novel approaches have been introduced relying on map-based, vibrotactile or gaze-based interaction. We introduce a novel interaction concept named ‘VibroGaze’ that combines the benefits of vibrotactile and gaze-based intera...
Article
Spatial information acquisition happens in large part through the visual sense. Studying visual attention and its connection to cognitive processes has been the interest of many research efforts in spatial cognition over the years. Recent technological developments have led to an increasing popularity of eye-tracking methodology for investigating r...
Conference Paper
This paper explores the design space for interacting with maps on Optical (See-Through) Head-Mounted Displays (OHMDs). The resulting interactions were evaluated in a comprehensive experiment involving 31 participants. More precisely, novel head-based interactions were compared with well-known haptic interactions on an OHMD regarding efficiency, eff...
Conference Paper
In this paper we use pupil diameter as an indicator for measuring cognitive load for six different tasks on common web maps. Two eye tracking data sets were collected for different basemaps (37 participants and 1,328 trials in total). We found significant differences in mean pupil diameter between tasks, indicating low cognitive load for free explo...
Conference Paper
Full-text available
In recent years there has been a growing interest in augmenting human cognition (attention, engagement, memory, learning, etc.) through ubiquitous technologies. With the ongoing research and development of near-constant capture devices, unlimited storage, and algorithms for retrieval, the resulting personal data has opened the door to a vast range...
Conference Paper
Full-text available
Efficient user interfaces help their users to accomplish their tasks by adapting to their current needs. The processes involved before and during interface adaptation are complex and crucial for the success and acceptance of a user interface. In this work we identify these processes and propose a framework that demonstrates the benefits that can be...
Article
Geographic Information Systems (GIS) are complex software environments and we often work with multiple tasks and multiple displays when we work with GIS. However, user input is still limited to mouse and keyboard in most workplace settings. In this project, we demonstrate how the use of gaze and feet as additional input modalities can overcome time...
Article
Full-text available
Geographic Information Systems (GIS) are complex software environments and we often work with multiple tasks and multiple displays when we work with GIS. However, user input is still limited to mouse and keyboard in most workplace settings. In this project, we demonstrate how the use of gaze and feet as additional input modalities can overcome time...
Conference Paper
Full-text available
The focus of this study is on wayfinding in large complex buildings with different wayfinding devices. The interaction of pedestrians of such devices is always also interplay with the surrounding environment and its specific features. Furthermore different wayfinding assistances can elicit different needs for additional information from the environ...
Conference Paper
A convolution-filtering technique is introduced for the synthesis of eye gaze data. Its purpose is to produce, in a controlled manner, a synthetic stream of raw gaze position coordinates, suitable for: (1) testing event detection filters, and (2) rendering synthetic eye movement animations for testing eye tracking gaze estimation algorithms. Synthe...
Conference Paper
Wayfinding models can be helpful in describing, understanding, and technologically supporting the processes involved in navigation. However, current models either lack a high degree of formalization, or they are not holistic and perceptually grounded, which impedes their use for cognitive engineering. In this paper, we propose a novel formalism tha...
Conference Paper
Full-text available
Pedestrian navigation systems help us make a series of decisions that lead us to a destination. Most current pedestrian navigation systems communicate using map-based turn-byturn instructions. This interaction mode su�ers from ambiguity, its user’s ability to match the instruction with the environment, and it requires a redirection of visual attent...
Conference Paper
Pedestrian navigation systems help us make a series of decisions that lead us to a destination. Most current pedestrian navigation systems communicate using map-based turn-by-turn instructions. This interaction mode suffers from ambiguity, its user's ability to match the instruction with the environment, and it requires a redirection of visual atte...
Conference Paper
We propose to keep track of the user's attention during interaction with a small display screen, and use that attention history for later interface adaptation. A framework for attention-based implicit interaction is described that consists of attention measuring, mapping, logging, aggregation, interpretation, and interface adaptation. The framework...
Conference Paper
Full-text available
This position paper considers the collocated interaction opportunities offered through the combination of mobile eye tracking and head-mounted displays. We introduce collocated interaction during wayfinding among collaborators and one of three types of spatial information that can be used. We highlight how the combination of these wearable technolo...
Article
Full-text available
Eye tracking is one of the most prominent modalities to track user attention while interacting with computational devices. Today, most of the current eye tracking frameworks focus on tracking the user gaze during website browsing or while performing other tasks and interactions with a digital device. Most frameworks have in common that they do not...
Conference Paper
Full-text available
Humans engage in wayfinding many times a day. We try to find our way in urban environments when walking towards our work places or when visiting a city as tourists. In order to reach the targeted destination, we have to make a series of wayfinding decisions of varying complexity. Previous research has focused on classifying the complexity of these...
Book
Full-text available
This document contains the proceedings of the 2nd International Workshop on Eye Tracking for Spatial Research (ET4S 2014), held on September 23, 2014 in Vi-enna, Austria, in conjunction with the Eighth International Conference on Geograph-ic Information Science (GIScience). Eye tracking has become a popular method for investigating research questio...
Conference Paper
Full-text available
Predicting the moment when a visual explorer of a place loses interest and starts to get bored is of considerable importance to the design of touristic information services. This paper investigates factors affecting the duration of the visual exploration of a city panorama. We report on an empirical outdoor eye tracking study in the real world with...
Conference Paper
Full-text available
We investigated the interpolation of missing values in data that were fit by bidimensional regression models. This addresses a problem in spatial cognition research in which sketch maps are used to assess the veracity of spatial representations. In several simulations, we compared samples of different sizes with different numbers of interpolated co...
Conference Paper
Full-text available
The spatio-temporal characteristics of eye movements vary according to the activity the user of a cartographic map is performing. In this paper, we use these eye movement characteristics to automatically detect the map user’s activity, an approach with great potential in gaze-assistive map interfaces. A dataset of 587 eye movement recordings from 1...
Conference Paper
Full-text available
The restricted spatial context of mobile devices with small displays often makes orientation on mobile maps very difficult. In this paper we highlight and discuss the advantages of a proposed interaction concept called GeoGazemarks that can be used to facilitate orientation by utilizing the history of a user’s visual attention as a visual clue. We...
Conference Paper
Wayfinding is a deeply complex process that humans engage in on a daily basis. The rise of available sensory information delivered by mobile devices and the public availability of GPS provide a new direction for efficient wayfinding assistance systems. In this work we utilize mobile eye tracking technology in order to investigate processes during w...
Conference Paper
Full-text available
Eye tracking has become a popular method for investigating research questions related to spatial information theory. This includes studies on how people interact with geographic information systems and studies on how space is perceived in decision situations. Knowledge of how people perceive spatial information can help us, for instance, designing...
Article
Self-localization is the process of identifying one’s current position on a map, and it is a crucial part of any wayfinding process. During self-localization the wayfinder matches visually perceptible features of the environment, such as landmarks, with map symbols to constrain potential locations on the map. The success of this visual matching pro...
Conference Paper
Full-text available
This position paper considers location-aware mobile gaze-based interaction. In this form of interaction three types of spatial information can be used: a) the user’s location, b) gazes at the geo-content displayed on the screen, c) gazes at objects in the real world. We summarize current work and outline future challenges.
Conference Paper
Full-text available
This paper introduces gaze map matching as the problem of algorithmically interpreting eye tracking data with respect to geographic vector features, such as a road network shown on a map. This differs from previous eye tracking studies which have not taken into account the underlying vector data of the cartographic map. The paper explores the chall...
Conference Paper
Full-text available
Orientation on small display maps is often difficult because the visible spatial context is restricted. This paper proposes to provide the history of a user’s visual attention on a map as visual clue to facilitate orientation. Visual attention on the map is recorded with eye tracking, clustered geo-spatially, and visualized when the user zooms out. T...

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Projects

Projects (5)
Archived project
Project
Our project URwalking aims at the development of a pedestrian navigation system at our university campus. Users should be guided along preference adapted routes by intuitive instructions taking landmarks along the path into account.