Reasoning about Cardinal Directions Using Grids as Qualitative Geographic Coordinates. - Lars Kulik; Alexander Klippel (COSIT, 1999)

Using Grids in Maps. - Alexander Klippel; Lars Kulik (Diagrams, 2000)

Schematic Maps as Wayfinding Aids. - Hernan Casakin; Thomas Barkowsky; Alexander Klippel; Christian Freksa (Spatial Cognition, 2000)

Acquisition of Landmark Knowledge from Static and Dynamic Presentation of Route Maps. - Paul U. Lee; Heike Tappe; Alexander Klippel (Künstliche Intell., 2002)

Wayfinding Choremes. - Alexander Klippel (COSIT, 2003)

The Effect of Motion in Graphical User Interfaces. - Paul U. Lee; Alexander Klippel; Heike Tappe (Smart Graphics, 2003)

Pictorial Representations of Routes: Chunking Route Segments during Comprehension. - Alexander Klippel; Heike Tappe; Christopher Habel (Spatial Cognition, 2003)

Wayfinding choremes: conceptualizing wayfinding and route direction elements. - Alexander Klippel (2003)

Perceptually Induced Distortions in Cognitive Maps. - Alexander Klippel; Lothar Knuf; Bernhard Hommel; Christian Freksa (Spatial Cognition, 2004)

A Model for Context-Specific Route Directions. - Kai-Florian Richter; Alexander Klippel (Spatial Cognition, 2004)

Wayfinding choremes - conceptualizing wayfinding and route direction elements. - Alexander Klippel (Künstliche Intell., 2004)

The Cognitive Conceptual Approach as a Leitmotif for Map Design. - Alexander Klippel; Paul U. Lee; Sara Irina Fabrikant; Daniel R. Montello; John A. Bateman (AAAI Spring Symposium: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance, 2005)

Dynamic Aspects of Spatial Information in Air Traffic Controller Displays. - Paul U. Lee; Alexander Klippel (AAAI Spring Symposium: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance, 2005)

Structural Salience of Landmarks for Route Directions. - Alexander Klippel; Stephan Winter 001 (COSIT, 2005)

A Cognitive Perspective on Spatial Context. - Christian Freksa; Alexander Klippel; Stephan Winter 001 (Spatial Cognition: Specialization and Integration, 2005)

Wayfinding Choreme Maps. - Alexander Klippel; Kai-Florian Richter; Stefan Hansen (VISUAL, 2005)

Wayfinding choremes - a language for modeling conceptual route knowledge. - Alexander Klippel; Heike Tappe; Lars Kulik; Paul U. Lee (J. Vis. Lang. Comput., 2005)

Landmarks in OpenLS - A Data Structure for Cognitive Ergonomic Route Directions. - Stefan Hansen; Kai-Florian Richter; Alexander Klippel (GIScience, 2006)

Algorithms for Reliable Navigation and Wayfinding. - Shazia Haque; Lars Kulik; Alexander Klippel (Spatial Cognition, 2006)

Before or After: Prepositions in Spatially Constrained Systems. - Kai-Florian Richter; Alexander Klippel (Spatial Cognition, 2006)

Embodying Spatial Maps. - Bernhard Hommel; Alexander Klippel (AAAI Spring Symposium: Control Mechanisms for Spatial Knowledge Processing in Cognitive / Intelligent Systems, 2007)

Linguistic and Nonlinguistic Turn Direction Concepts. - Alexander Klippel; Daniel R. Montello (COSIT, 2007)

Identifying factors of geographic event conceptualisation. - Alexander Klippel; Michael F. Worboys; Matt Duckham (Int. J. Geogr. Inf. Sci., 2008)

The Endpoint Hypothesis: A Topological-Cognitive Assessment of Geographic Scale Movement Patterns. - Alexander Klippel; Rui Li 023 (COSIT, 2009)

Extracting Route Directions from Web Pages. - Xiao Zhang 019; Prasenjit Mitra; Sen Xu; Anuj R. Jaiswal; Alexander Klippel; Alan M. MacEachren (WebDB, 2009)

Colour-Enhanced Star Plot Glyphs: Can Salient Shape Characteristics Be Overcome? - Alexander Klippel; Frank Hardisty; Rui Li 023; Chris E. Weaver (Cartogr. Int. J. Geogr. Inf. Geovisualization, 2009)

Human factors in GIScience laboratory at the Pennsylvania State University. - Alexander Klippel (Cogn. Process., 2009)

Urban granularities - a data structure for cognitively ergonomic route directions. - Alexander Klippel; Stefan Hansen; Kai-Florian Richter; Stephan Winter 001 (GeoInformatica, 2009)

Topologically Characterized Movement Patterns: A Cognitive Assessment. - Alexander Klippel (Spatial Cogn. Comput., 2009)

Using space syntax to understand knowledge acquisition and wayfinding in indoor environments. - Rui Li 023; Alexander Klippel (IEEE ICCI, 2010)

Cognitive Invariants of Geographic Event Conceptualization: What Matters and What Refines? - Alexander Klippel; Rui Li 023; Frank Hardisty; Chris E. Weaver (GIScience, 2010)

Automatic Extraction of Destinations, Origins and Route Parts from Human Generated Route Directions. - Xiao Zhang 019; Prasenjit Mitra; Alexander Klippel; Alan M. MacEachren (GIScience, 2010)

Psychophysical Evaluation for a Qualitative Semantic Image Categorisation and Retrieval Approach. - Zia Ul-Qayyum; Anthony G. Cohn 001; Alexander Klippel (IEA/AIE (3), 2010)

Analysing spatio-temporal autocorrelation with LISTA-Viz. - Frank Hardisty; Alexander Klippel (Int. J. Geogr. Inf. Sci., 2010)

You-Are-Here Maps: Creating Spatial Awareness through Map-like Representations. - Alexander Klippel; Stephen C. Hirtle; Clare Davies (Spatial Cogn. Comput., 2010)

Geographic Event Conceptualization: Where Spatial and Cognitive Sciences Meet. - Rui Li 023; Alexander Klippel; Jinlong Yang 004 (CogSci, 2011)

Identifying destinations automatically from human generated route directions. - Xiao Zhang 019; Prasenjit Mitra; Alexander Klippel; Alan M. MacEachren (GIS, 2011)

GeoCAM: A geovisual analytics workspace to contextualize and interpret statements about movement. - Anuj R. Jaiswal; Scott Pezanowski; Prasenjit Mitra; Xiao Zhang 019; Sen Xu; Ian Turton; Alexander Klippel; Alan M. MacEachren (J. Spatial Inf. Sci., 2011)

Report on the first workshop on Movement Pattern Analysis MPA10. - Patrick Olivier Laube; Björn Gottfried; Alexander Klippel; Roland Billen; Nico Van de Weghe (J. Spatial Inf. Sci., 2011)

Movement Choremes: Bridging Cognitive Understanding and Formal Characterizations of Movement Patterns. - Alexander Klippel (Top. Cogn. Sci., 2011)

Disambiguating Road Names in Text Route Descriptions using Exact-All-Hop Shortest Path Algorithm. - Xiao Zhang 019; Baojun Qiu; Prasenjit Mitra; Sen Xu; Alexander Klippel; Alan M. MacEachren (ECAI, 2012)

Investigations into the Cognitive Conceptualization and Similarity Assessment of Spatial Scenes. - Jan Oliver Wallgrün; Jinlong Yang 004; Alexander Klippel; Frank Dylla (GIScience, 2012)

Assessing Similarities of Qualitative Spatio-temporal Relations. - Alexander Klippel; Jinlong Yang 004; Jan Oliver Wallgrün; Frank Dylla; Rui Li 023 (Spatial Cognition, 2012)

Formally grounding spatio-temporal thinking. - Alexander Klippel; Jan Oliver Wallgrün; Jinlong Yang 004; Rui Li 023; Frank Dylla (Cogn. Process., 2012)

Investigating intuitive granularities of overlap relations. - Jan Oliver Wallgrün; Jinlong Yang 004; Alexander Klippel (ICCI*CC, 2013)

Fundamental Cognitive Concepts of Space (and Time): Using Cross-Linguistic, Crowdsourced Data to Cognitively Calibrate Modes of Overlap. - Alexander Klippel; Jan Oliver Wallgrün; Jinlong Yang 004; Jennifer Smith Mason; Eun-Kyeong Kim; David M. Mark (COSIT, 2013)

Linking context and proximity through web corpus. - Sen Xu; Alexander Klippel (GIR, 2013)

Building a corpus of spatial relational expressions extracted from web documents. - Jan Oliver Wallgrün; Alexander Klippel; Timothy Baldwin (GIR, 2014)

Boundaries and Prototypes in Categorizing Direction. - Vivien Mast; Diedrich Wolter; Alexander Klippel; Jan Oliver Wallgrün; Thora Tenbrink (Spatial Cognition, 2014)

Cognitive Evaluation of Spatial Formalisms: Intuitive Granularities of Overlap Relations. - Jan Oliver Wallgrün; Jinlong Yang 004; Alexander Klippel (Int. J. Cogn. Informatics Nat. Intell., 2014)

Exploring Regional Variation in Spatial Language Using Spatially Stratified Web-Sampled Route Direction Documents. - Sen Xu; Alexander Klippel; Alan M. MacEachren; Prasenjit Mitra (Spatial Cogn. Comput., 2014)

Conceptualizing Landscap - A Comparative Study of Landscape Categories with Navajo and English-Speaking Participants. - Alexander Klippel; David M. Mark; Jan Oliver Wallgrün; David Stea (COSIT, 2015)

Citizen Science Land Cover Classification Based on Ground and Aerial Imagery. - Kevin A. Sparks; Alexander Klippel; Jan Oliver Wallgrün; David M. Mark (COSIT, 2015)

Towards contextualized models of spatial relations. - Jan Oliver Wallgrün; Alexander Klippel; Morteza Karimzadeh (GIR, 2015)

Immersive Analytics for Multi-objective Dynamic Integrated Climate-Economy (DICE) Models. - Mark B. Simpson; Jan Oliver Wallgrün; Alexander Klippel; Liping Yang; Gregory Garner; Klaus Keller; Danielle Oprean; Saurabh Bansal (ISS Companion, 2016)

Special issue introduction: Approaching spatial uncertainty visualization to support reasoning and decision making. - Jennifer Smith Mason; Alexander Klippel; Susanne Bleisch; Aidan Slingsby; Stephanie Deitrick (Spatial Cogn. Comput., 2016)

Developing and Evaluating VR Field Trips. - Danielle Oprean; Jan Oliver Wallgrün; Jose Manuel Pinto Duarte; Debora Verniz; Jiayan Zhao; Alexander Klippel (COSIT (Workshops/Posters), 2017)

Immersive Technologies and Experiences for Archaeological Site Exploration and Analysis. - Jan Oliver Wallgrün; Jiawei Huang 004; Jiayan Zhao; Claire Ebert; Paul Roddy; Jaime J. Awe; Tim Murtha; Alexander Klippel (COSIT (Workshops/Posters), 2017)

iVR for the geosciences. - Jiayan Zhao; Peter C. LaFemina; Jan Oliver Wallgrün; Danielle Oprean; Alexander Klippel (KELVAR@VR, 2017)

Quantifying space, understanding minds: A visual summary approach. - Mark B. Simpson; Kai-Florian Richter; Jan Oliver Wallgrün; Alexander Klippel (J. Spatial Inf. Sci., 2017)

Collaborating remotely: an evaluation of immersive capabilities on spatial experiences and team membership. - Danielle Oprean; Mark B. Simpson; Alexander Klippel (Int. J. Digit. Earth, 2018)

For the Many, Not the One: Designing Low-Cost Joint VR Experiences for Place-Based Learning. - Jan Oliver Wallgrün; Jack Shen-Kuen Chang; Jiayan Zhao; Pejman Sajjadi; Danielle Oprean; Thomas B. Murphy; Jennifer Baka; Alexander Klippel (EuroVR, 2019)

Human Interpretation of Trade-Off Diagrams in Multi-Objective Problems: Implications for Developing Interactive Decision Support Systems. - Danielle Oprean; Caitlin Spence; Mark B. Simpson; Randy Miller Jr.; Saurabh Bansal; Klaus Keller; Alexander Klippel (HICSS, 2019)

Immersive Learning in the Wild: A Progress Report. - Alexander Klippel; Danielle Oprean; Jiayan Zhao; Jan Oliver Wallgrün; Peter C. LaFemina; Kathy L. Jackson; Elise Gowen (iLRN, 2019)

Visualizing Natural Environments from Data in Virtual Reality: Combining Realism and Uncertainty. - Jiawei Huang 004; Melissa S. Lucash; Mark B. Simpson; Casey Helgeson; Alexander Klippel (VR, 2019)

Visualizing Ecological Data in Virtual Reality. - Jiawei Huang 004; Melissa S. Lucash; Robert M. Scheller; Alexander Klippel (VR, 2019)

Warping Space and Time-Reviving Educational Tools of the 19th Century. - Alexander Klippel; Jan Oliver Wallgrün; Arif Masrur; Jiayan Zhao; Peter C. LaFemina (VR, 2019)

Research Framework for Immersive Virtual Field Trips. - Alexander Klippel; Jiayan Zhao; Danielle Oprean; Jan Oliver Wallgrün; Jack Shen-Kuen Chang (VR, 2019)

Low-Cost VR Applications to Experience Real Word Places Anytime, Anywhere, and with Anyone. - Jan Oliver Wallgrün; Arif Masrur; Jiayan Zhao; Alan Taylor; Eric Knapp; Jack Shen-Kuen Chang; Alexander Klippel (WEVR@VR, 2019)

Scale - Unexplored Opportunities for Immersive Technologies in Place-based Learning. - Jiayan Zhao; Alexander Klippel (VR, 2019)

Where are we now? Re-visiting the Digital Earth through human-centered virtual and augmented reality geovisualization environments. - Arzu Çöltekin; Danielle Oprean; Jan Oliver Wallgrün; Alexander Klippel (Int. J. Digit. Earth, 2019)

Harnessing the power of immersive virtual reality - visualization and analysis of 3D earth science data sets. - Jiayan Zhao; Jan Oliver Wallgrün; Peter C. LaFemina; Jim Normandeau; Alexander Klippel (Geo spatial Inf. Sci., 2019)

Fostering Penetrative Thinking in Geosciences Through Immersive Experiences: A Case Study in Visualizing Earthquake Locations in 3D. - Mahda M. Bagher; Pejman Sajjadi; Julia Carr; Peter La Femina; Alexander Klippel (iLRN, 2020)

Mixed or Virtual: Does Device Type Matter in Human-ECA Interactions. - Pejman Sajjadi; Mahda M. Bagher; Jan Oliver Wallgrün; Stefan Kopp; Philipp Cimiano; Alexander Klippel (iLRN, 2020)

Design of a Serious Game to Inform the Public About the Critical Zone. - Pejman Sajjadi; Mahda M. Bagher; Zheng Cui; Jessica G. Myrick; Janet K. Swim; Timothy S. White; Alexander Klippel (SeGAH, 2020)

The Effect of Virtual Agent Gender and Embodiment on the Experiences and Performance of Students in Virtual Field Trips. - Pejman Sajjadi; Jiayan Zhao; Jan Oliver Wallgrün; Tanya Furman; Peter C. LaFemina; Alex Fatemi; Zachary E. Zidik; Alexander Klippel (TALE, 2020)

Immersive Place-based Learning - An Extended Research Framework. - Alexander Klippel; Jiayan Zhao; Pejman Sajjadi; Jan Oliver Wallgrün; Mahda M. Bagher; Danielle Oprean (VR Workshops, 2020)

CZ Investigator: Learning About Critical Zones Through a VR Serious Game. - Pejman Sajjadi; Mahda M. Bagher; Zheng Cui; Jessica G. Myrick; Janet K. Swim; Timothy S. White; Alexander Klippel (VR Workshops, 2020)

A Comparison of Visual Attention Guiding Approaches for 360° Image-Based VR Tours. - Jan Oliver Wallgrün; Mahda M. Bagher; Pejman Sajjadi; Alexander Klippel (VR, 2020)

Learning in the Field: Comparison of Desktop, Immersive Virtual Reality, and Actual Field Trips for Place-Based STEM Education. - Jiayan Zhao; Peter C. LaFemina; Julia Carr; Pejman Sajjadi; Jan Oliver Wallgrün; Alexander Klippel (VR, 2020)

Extended Realities - How Changing Scale Affects Spatial Learning. - Jiayan Zhao; Mark B. Simpson; Jan Oliver Wallgrün; Pejman Sajjadi; Alexander Klippel (VR Workshops, 2020)

The Effects of Visual Realism on Spatial Memory and Exploration Patterns in Virtual Reality. - Jiawei Huang 004; Alexander Klippel (VRST, 2020)

From spatial to platial - the role and future of immersive technologies in the spatial sciences. - Alexander Klippel (J. Spatial Inf. Sci., 2020)

Desktop versus immersive virtual environments: effects on spatial learning. - Jiayan Zhao; Tesalee Sensibaugh; Bobby Bodenheimer; Timothy P. McNamara; Alina Nazareth; Nora S. Newcombe; Meredith Minear; Alexander Klippel (Spatial Cogn. Comput., 2020)

The value of being there: toward a science of immersive virtual field trips. - Alexander Klippel; Jiayan Zhao; Danielle Oprean; Jan Oliver Wallgrün; Chris Stubbs; Peter La Femina; Kathy L. Jackson (Virtual Real., 2020)

Influence of HMD Type and Spatial Ability on Experiences and Learning in Place-based Education. - Pejman Sajjadi; Jiayan Zhao; Jan Oliver Wallgrün; Peter La Femina; Alexander Klippel (iLRN, 2021)

Place-Based Learning Through a Proxy - Variations in the Perceived Benefits of a Virtual Tour. - Jan Oliver Wallgrün; Eric Knapp; Alan Taylor; Alexander Klippel; Jiayan Zhao; Pejman Sajjadi (iLRN, 2021)

CrowdXR - Pitfalls and Potentials of Experiments with Remote Participants. - Jiayan Zhao; Mark B. Simpson; Pejman Sajjadi; Jan Oliver Wallgrün; Ping Li 026; Mahda M. Bagher; Danielle Oprean; Lace M. K. Padilla; Alexander Klippel (ISMAR, 2021)

Fostering Geological Thinking Through Virtual Strike and Dip Measurements. - Natalie Bursztyn; Hannah Riegel; Pejman Sajjadi; Bart Masters; Jiayan Zhao; Jiawei Huang 004; Mahda M. Bagher; Jan Oliver Wallgrün; Alexander Klippel (VR Workshops, 2021)

HMD Type and Spatial Ability: Effects on the Experiences and Learning of Students in Immersive Virtual Field Trips. - Pejman Sajjadi; Jiayan Zhao; Jan Oliver Wallgrün; Peter C. LaFemina; Alexander Klippel (VR Workshops, 2021)

Move The Object or Move The User: The Role of Interaction Techniques on Embodied Learning in VR. - Mahda M. Bagher; Pejman Sajjadi; Jan Oliver Wallgrün; Peter La Femina; Alexander Klippel (Frontiers Virtual Real., 2021)

Walking through the forests of the future: using data-driven virtual reality to visualize forests under climate change. - Jiawei Huang 004; Melissa S. Lucash; Robert M. Scheller; Alexander Klippel (Int. J. Geogr. Inf. Sci., 2021)

Remote iVR for Nutrition Education: From Design to Evaluation. - Pejman Sajjadi; Caitlyn G. Edwards; Jiayan Zhao; Alex Fatemi; John W. Long; Alexander Klippel; Travis D. Masterson (Frontiers Comput. Sci., 2022)

Virtual geographic environment construction based on ubiquitous geographic information. - Songshan Yue; Hui Lin 002; Guonian Lü; Alexander Klippel; Min Chen 008 (Trans. GIS, 2022)

Designing healthy public spaces: A participatory approach through immersive virtual reality. - Suzan Evers; Gamze Dane; Pauline E. W. van den Berg; Alexander K. A. J. Klippel; Timon Verduijn; Theo A. Arentze (AGILE Conf., 2023)

Advancing Forest Monitoring and Assessment Through Immersive Virtual Reality. - Raphael Zürcher; Jiayan Zhao; Alvaro Lau Sarmiento; Benjamin Brede; Alexander Klippel (AGILE Conf., 2023)

AnywhereXR - Laying the Foundation for Open Source Embodied Digital Twin Applications. - Alexander Klippel; Bart Knuiman; Jiayan Zhao; Jan Oliver Wallgrün; Sebastian Garzon (IMET, 2023)

Corrigendum: Remote iVR for nutrition education: from design to evaluation. - Pejman Sajjadi; Caitlyn G. Edwards; Jiayan Zhao; Alex Fatemi; John W. Long; Alexander Klippel; Travis D. Masterson (Frontiers Comput. Sci., 2023)

Editorial: Human spatial perception, cognition, and behaviour in extended reality. - Jiayan Zhao; Bernhard E. Riecke; Jonathan W. Kelly; Jeanine K. Stefanucci; Alexander Klippel (Frontiers Virtual Real., 2023)

Experiencing the future: Evaluating a new framework for the participatory co-design of healthy public spaces using immersive virtual reality. - Gamze Dane; Suzan Evers; Pauline van den Berg; Alexander Klippel; Timon Verduijn; Jan Oliver Wallgrün; Theo A. Arentze (Comput. Environ. Urban Syst., 2024)

Integrating Virtual Reality and Physiological Measures to study Restorative Environments for Mental Well-Being. - Layla Farmahini Farahani; Ifigeneia Mavridou; Jiayan Zhao; Alexander Klippel (VR Workshops, 2025)

V-CURRENTS: Virtual Collaborative Underwater Realities for Engagement and Novel Teaching Spaces. - Alexander Klippel; Jeroen Hubert; Jan Oliver Wallgrün; Joseph Henry; Thomas Bruhn; Timon Verduijn; Tinka Murk (VR Workshops, 2025)

AReplica: User-Centered Design of an Augmented Reality Portion Size Estimation Tool for Dietary Intake Assessment. - Nina Rosa; Esther Kok; Els Siebelink; Michelle van Alst; Travis D. Masterson; Alexander Klippel (VR Workshops, 2025)

Optimizing Velocity Thresholds for Fixation Detection in Virtual Reality Using the I-VT Algorithm. - Jiayan Zhao; Ate Jepma; Jan Oliver Wallgrün; Alexander Klippel (VR Workshops, 2025)

AnywhereXR: On-the-fly 3D Environments as a Basis for Open Source Immersive Digital Twin Applications. - Alexander Klippel; Bart Knuiman; Jiayan Zhao; Jan Oliver Wallgrün; Jascha Grübel (CoRR, 2025)