Glira, P., Weidinger, C., Otepka-Schremmer, J., Ressl, C., Pfeifer, N., & Haberler-Weber, M. (2023). Nonrigid point cloud registration using piecewise tricubic polynomials as transformation model. Remote Sensing, 15(22), Article 5348. https://doi.org/10.3390/rs15225348 ( reposiTUm)

Wild, B., Verhoeven, G. J., Wieser, M., Ressl, C., Schlegel, J., Wogrin, S., Otepka-Schremmer, J., & Pfeifer, N. (2022). AUTOGRAF—AUTomated Orthorectification of GRAFfiti Photos. Heritage, 5(4), 2987–3009. https://doi.org/10.3390/heritage5040155 ( reposiTUm)

Loghin, A.-M., Otepka-Schremmer, J., Ressl, C., & Pfeifer, N. (2022). Improvement of VHR Satellite Image Geometry with High Resolution Elevation Models. Remote Sensing, 14(10), 2303. https://doi.org/10.3390/rs14102303 ( reposiTUm)

Bachhofner, S., Loghin, A.-M., Otepka, J., Pfeifer, N., Hornacek, M., Siposova, A., Schmidinger, N., Hornik, K., Schiller, N., Kähler, O., & Hochreiter, R. (2020). Generalized Sparse Convolutional Neural Networks for Semantic Segmentation of Point Clouds Derived from Tri-Stereo Satellite Imagery. Remote Sensing, 12(8), 1289. https://doi.org/10.3390/rs12081289 ( reposiTUm)

Schütz, M., Mandlburger, G., Otepka, J., & Wimmer, M. (2020). Progressive Real‐Time Rendering of One Billion Points Without Hierarchical Acceleration Structures. Computer Graphics Forum, 39(2), 51–64. https://doi.org/10.1111/cgf.13911 ( reposiTUm)

Loghin, A.-M., Otepka-Schremmer, J., & Pfeifer, N. (2020). Potential of Pléiades and WorldView-3 Tri-Stereo DSMs to Represent Heights of Small Isolated Objects. Sensors, 20(9), 2695. https://doi.org/10.3390/s20092695 ( reposiTUm)

Bruggisser, M., Hollaus, M., Otepka, J., & Pfeifer, N. (2020). Influence of ULS acquisition characteristics on tree stem parameter estimation. ISPRS Journal of Photogrammetry and Remote Sensing, 168, 28–40. https://doi.org/10.1016/j.isprsjprs.2020.08.002 ( reposiTUm)

Tran, T. H. G., Otepka, J., Wang, D., & Pfeifer, N. (2018). Classification of image matching point clouds over an urban area. International Journal of Remote Sensing, 39(12), 4145–4169. https://doi.org/10.1080/01431161.2018.1452069 ( reposiTUm)

Wieser, M., Mandlburger, G., Hollaus, M., Otepka, J., Glira, P., & Pfeifer, N. (2017). A Case Study of UAS Borne Laser Scanning for Measurement of Tree Stem Diameter. Remote Sensing, 9(11), 1154. https://doi.org/10.3390/rs9111154 ( reposiTUm)

Pfeifer, N., Mandlburger, G., Otepka, J., & Karel, W. (2014). OPALS - A framework for Airborne Laser Scanning data analysis. COMPUTERS ENVIRONMENT AND URBAN SYSTEMS, 45, 125–136. https://doi.org/10.1016/j.compenvurbsys.2013.11.002 ( reposiTUm)

Otepka, J., Ghuffar, S., Waldhauser, C., Hochreiter, R., & Pfeifer, N. (2013). Georeferenced point clouds: a survey of features and point cloud management. ISPRS International Journal of Geo-Information. https://doi.org/10.3390/ijgi2041038 ( reposiTUm)

Mandlburger, G., Höfle, B., Briese, C., Ressl, C., Otepka, J., Hollaus, M., & Pfeifer, N. (2009). Topographische Daten aus Laserscanning als Grundlage für Hydrologie und Wasserwirtschaft. Österreichische Wasser- Und Abfallwirtschaft, 61(7–8), 89–97. https://doi.org/10.1007/s00506-009-0095-3 ( reposiTUm)

Otepka-Schremmer, J., Muraleva, A., Forkert, G., Ressl, C., & Pfeifer, N. (2025). Mehrstufige Ebenenextraktion aus 3D Punktwolken als Basis für Gebäudemodelle. In T. Weinold (Ed.), 23. Internationale Geodätische Woche Obergurgl 2025 (pp. 80–90). Wichmann, VDE Verlag. http://hdl.handle.net/20.500.12708/213391 ( reposiTUm)

Otepka-Schremmer, J., Bayr, A., Brandtner, B., Mandlburger, G., & Pfeifer, N. (2023). Verschmelzen von Höhenmodellen unterschiedlicher Auflösung und Genauigkeiten. In 22. Internationale Geodätische Woche Obergurgl 2023 (pp. 113–123). Wichmann. ( reposiTUm)

Wild, B., Verhoeven, G. J., Wieser, M., Ressl, C., Otepka-Schremmer, J., & Pfeifer, N. (2023). Graffiti-Dokumentation: Projekt INDIGO. In 22. Internationale Geodätische Woche Obergurgl 2023 (pp. 322–325). Herbert Wichmann Verlag. ( reposiTUm)

Wild, B., Verhoeven, G. J., Wogrin, S., Wieser, M., Ressl, C., Otepka-Schremmer, J., & Pfeifer, N. (2023). Urban Creativity Meets Engineering. Automated Graffiti Mapping along Vienna’s Donaukanal. In G. J. Verhoeven, J. Schlegel, B. Wild, S. Wogrin, & M. Carloni (Eds.), Document, archive, disseminate graffiti-scapes : Proceedings of the goINDIGO 2022 International Graffiti Symposium (pp. 131–145). Urban Creativity / AP2. https://doi.org/10.48619/indigo.v0i0.705 ( reposiTUm)

Verhoeven, G., Wild, B., Schlegel, J., Wieser, M., Pfeifer, N., Wogrin, S., Eysn, L., Carloni, M., Koschiček-Krombholz, B., Molada-Tebar, A., Otepka-Schremmer, J., Ressl, C., Trognitz, M., & Watzinger, A. (2022). PROJECT INDIGO – DOCUMENT, DISSEMINATE & ANALYSE A GRAFFITI-SCAPE. In The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 513–520). The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-archives-xlvi-2-w1-2022-513-2022 ( reposiTUm)

Mandlburger, G., Monetti, D., Hollaus, M., Wimmer, M., Otepka-Schremmer, J., & Pfeifer, N. (2021). A case study for detection and modelling of submerged deadwood from UAV-borne topo-bathymetric LiDAR point clouds. In Proceedings of the SilviLaser Conference 2021 (pp. 195–197). https://doi.org/10.34726/wim.1979 ( reposiTUm)

Otepka, J., Mandlburger, G., Karel, W., Wöhrer, B., Ressl, C., & Pfeifer, N. (2021). A FRAMEWORK FOR GENERIC SPATIAL SEARCH IN 3D POINT CLOUDS. In ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 35–42). ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-annals-v-2-2021-35-2021 ( reposiTUm)

Otepka-Schremmer, J., Hollaus, M., Mandlburger, G., Gokl, L., Karel, W., Wöhrer, B., & Pfeifer, N. (2021). OPALS: A Flexible and Efficient Point Cloud Processing Software for Forest Application. In Proceedings of the SilviLaser Conference 2021 (pp. 246–249). https://doi.org/10.34726/wim.1995 ( reposiTUm)

Hollaus, M., Otepka-Schremmer, J., Galle, J., & Bronner, G. (2021). Branch detection based on TLS data. In Proceedings of the SilviLaser Conference 2021 (pp. 255–257). https://doi.org/10.34726/wim.2002 ( reposiTUm)

Bruggisser, M., Otepka, J., Pfeifer, N., & Hollaus, M. (2020). Influence of ULS data acquisition characteristics on the achievable stem reconstruction accuracies. In EGU General Assembly 2020 (EGU 2020). EGU General Assembly 2020, Vienna, Austria. Copernicus. https://doi.org/10.5194/egusphere-egu2020-7378 ( reposiTUm)

Loghin, A.-M., Pfeifer, N., & Otepka-Schremmer, J. (2020). Supervised Classification and its Repeatability for Point Clouds from Dense VHR Tri-Stereo Satellite Image Matching Using Machine Learning. In ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 525–532). ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-annals-v-2-2020-525-2020 ( reposiTUm)

Otepka, J., Mandlburger, G., Schütz, M., Pfeifer, N., & Wimmer, M. (2020). Efficient Loading And Visualization Of Massive Feature-Rich Point Clouds Without Hierarchical Acceleration Structures. In XXIV ISPRS Congress, Commission II (pp. 293–300). https://doi.org/10.5194/isprs-archives-xliii-b2-2020-293-2020 ( reposiTUm)

Loghin, A.-M., Otepka-Schremmer, J., Karel, W., Pöchtrager, M., & Pfeifer, N. (2019). Accuracy Analysis of Digital Elevation Models from very High Resolution Satellite Imagery. In T. Kersten (Ed.), Dreiländertagung der OVG, DGPF und SGPF: Photogrammetrie - Fernerkundung - Geoinformation - 2019 (pp. 123–137). Publikationen der DGPF. http://hdl.handle.net/20.500.12708/43916 ( reposiTUm)

Otepka-Schremmer, J., Pöchtrager, M., Hollaus, M., Loghin, A.-M., Piermattei, L., Briese, C., & Pfeifer, N. (2019). Landesweite Punktwolkenprozessierung mit OPALS am Supercomputer VSC3. In K. Hanke & T. Weinold (Eds.), 20. Internationale Geodätische Woche Obergurgl 2019 (pp. 165–176). Wichmann. http://hdl.handle.net/20.500.12708/43920 ( reposiTUm)

Otepka-Schremmer, J., Mandlburger, G., Briese, C., & Pfeifer, N. (2017). Fortschritte bei der automatischen Ableitung von Strukturlinien aus 3D-Punktwolken. In K. Hanke & T. Weinold (Eds.), 19. Internationale Geodätische Woche Obergurgl 2017 (pp. 209–220). Wichmann. http://hdl.handle.net/20.500.12708/43648 ( reposiTUm)

Mandlburger, G., Otepka-Schremmer, J., Briese, C., Mücke, W., Summer, G., Pfeifer, N., Baltrusch, S., Dorn, C., & Brockmann, H. (2016). Automatische Ableitung von Strukturlinien aus 3D-Punktwolken. In T. Kersten (Ed.), Dreiländertagung der SGPF, DGPF und OVG: Lösungen für eine Welt im Wandel (pp. 131–142). Publikationen der Deutschen Gesellschaft für Photogrammetrie, Fernerkundung und Geoinformation e.V. http://hdl.handle.net/20.500.12708/43507 ( reposiTUm)

Zlinszky, A., Otepka-Schremmer, J., & Kania, A. (2016). Attribute-based point cloud visualization in support of 3-D classification. In EGU General Assembly 2016. EGU General Assembly 2016, Vienna, Austria. Copernicus Publications. http://hdl.handle.net/20.500.12708/43551 ( reposiTUm)

Mandlburger, G., Wieser, M., Otepka-Schremmer, J., Pfennigbauer, M., & Pfeifer, N. (2015). Dokumentation von Hochwasser bedingten Veränderungen von Flussläufen mittels Laser Bathymetrie am Beispiel der Pielach. In K. Kondo & T. Weinold (Eds.), 18. Internationale Geodätische Woche Obergurgl 2015 (pp. 64–73). Wichmann. http://hdl.handle.net/20.500.12708/43405 ( reposiTUm)

Eysn, L., Mandlburger, G., Hollaus, M., Otepka-Schremmer, J., & Pfeifer, N. (2015). Algorithms and Tools for Point Cloud Based Vegetation Studies - The OPALS Forestry Package. In S. Durrieu & C. Véga (Eds.), Proceedings of SilviLaser 2015 (pp. 311–313). http://hdl.handle.net/20.500.12708/43482 ( reposiTUm)

Zlinszky, A., Schroiff, A., Otepka-Schremmer, J., Mandlburger, G., & Pfeifer, N. (2014). Simultaneous colour visualizations of multiple ALS point cloud attributes for land cover and vegetation analysis. In EGU General Assembly 2014. EGU General Assembly 2014, Vienna, Austria. http://hdl.handle.net/20.500.12708/43273 ( reposiTUm)

Mandlburger, G., Otepka-Schremmer, J., Miller, P., Steinbacher, F., Pfennigbauer, M., & Pfeifer, N. (2013). Vermessung von Fließgewässern mittels Airborne Laser Bathymetry. In 17. Internationale Geodätische Woche Obergurgl 2013 (pp. 125–134). Wichmann. http://hdl.handle.net/20.500.12708/43055 ( reposiTUm)

Otepka-Schremmer, J., Mandlburger, G., & Karel, W. (2012). The OPALS Data Manager - Efficient Data Management for Processing Large Airborne Laser Scanning Projects. In ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (ISPRS Annals) (pp. 153–159). http://hdl.handle.net/20.500.12708/43007 ( reposiTUm)

Otepka-Schremmer, J., Mandlburger, G., Karel, W., & Wöhrer, B. (2011). Verteilte Prozessierung von ALS-Daten mittels Cloud-Computing - Erste Ergebnisse einer Pilotstudie. In 16. Internationale geodätische Woche Obergurgl 2011 (p. 8). Herbert Wichmann. http://hdl.handle.net/20.500.12708/42696 ( reposiTUm)

Mandlburger, G., Otepka-Schremmer, J., Karel, W., Hollaus, M., Ressl, C., Haring, A., Briese, C., Molnár, G., & Höfle, B. (2011). OPALS - a comprehensive laser scanning software for geomorphological analysis. In Geophysical Research Abstracts (p. 1). http://hdl.handle.net/20.500.12708/42684 ( reposiTUm)

Hollaus, M., Wagner, W., Molnár, G., Mandlburger, G., Nothegger, C., & Otepka-Schremmer, J. (2010). Deliniation of vegetation and building polygons from full-waveform airborne lidar data using OPALS software. In Proceedings (p. 7). http://hdl.handle.net/20.500.12708/42622 ( reposiTUm)

Mandlburger, G., Otepka-Schremmer, J., Karel, W., Wöhrer, B., Wagner, W., & Pfeifer, N. (2010). OPALS (Orientation and Processing of Airborne Laser Scanning data) - Konzept und Anwendungsbeispiele einer wissenschaftlichen Laserscanning Software. In Publikationen der Deutschen Gesellschaft für Photogrammetrie, Fernerkundung und Geoinformation e.V. (pp. 376–387). http://hdl.handle.net/20.500.12708/42599 ( reposiTUm)

Mandlburger, G., Briese, C., Otepka-Schremmer, J., Höfle, B., & Pfeifer, N. (2010). Verwaltung landesweiter Full Waveform Airborne Laser Scanning Daten. In Publikationen der Deutschen Gesellschaft für Photogrammetrie, Fernerkundung und Geoinformation e.V. (pp. 356–365). http://hdl.handle.net/20.500.12708/42598 ( reposiTUm)

Mandlburger, G., & Otepka-Schremmer, J. (2009). OPALS - ein neues Programmsystem zur Orientierung und Prozessierung von Airborne Laserscanning Daten. In 15. Internationale Geodätische Woche Obergurgel 2009 (pp. 218–222). Wichmann. http://hdl.handle.net/20.500.12708/42318 ( reposiTUm)

Mandlburger, G., Otepka-Schremmer, J., Karel, W., Wagner, W., & Pfeifer, N. (2009). Orientation And Processing Of Airborne Laser Scanning Data (OPALS) - Concept And First Results Of A Comprehensive Als Software. In ISPRS Workshop Laserscanning `09 (pp. 55–60). http://hdl.handle.net/20.500.12708/42437 ( reposiTUm)

Otepka-Schremmer, J., Briese, C., & Pfeifer, N. (2007). Erweiterung der Linearen Prädiktion - Berücksichtigung zusätzlicher Linien-, Flächennormalen- und Krümmungsbeobachtungen. In E. Seyfert (Ed.), Dreiländertagung; Von der Medizintechnik bis zur Planetenforschung - Photogrammetrie und Fernerkundung für das 21. Jahrhundert (pp. 223–232). Publikationen der Deutschen Gesellschaft für Photogrammetrie, Fernerkundung und Geoinformation e.V. http://hdl.handle.net/20.500.12708/42064 ( reposiTUm)

Attwenger, M. E., Dorninger, P., Otepka-Schremmer, J., & Neukum, G. (2006). Investigating Fluvial Topography Forming Processes Of The Martian Surface By Means Of Raster Based Geometry Analysis. In Symposium of ISPRS Commission IV - Geo Spatial Databases for Sustainable Development (p. 6). http://hdl.handle.net/20.500.12708/42002 ( reposiTUm)

Otepka-Schremmer, J., Briese, C., & Nothegger, C. (2006). First Steps To A Topographic Information System Of The Next Generation. In Symposium of ISPRS Commission IV - Geo Spatial Databases for Sustainable Development (p. 6). http://hdl.handle.net/20.500.12708/42001 ( reposiTUm)

Kraus, K., & Otepka-Schremmer, J. (2005). DTM Modeling and Visualization - The SCOP Approach. In D. Fritsch (Ed.), Photogrammetric Week ’05 (pp. 241–252). Herbert Wichmann Verlag, Heidelberg. http://hdl.handle.net/20.500.12708/41895 ( reposiTUm)

Otepka-Schremmer, J., & Fraser, C. (2005). Measurement eccentricties of circular targets in vision metrology. In Optical 3-D Measurement Techniques VII (pp. 133–143). http://hdl.handle.net/20.500.12708/41941 ( reposiTUm)

Waldhauser, C., Hochreiter, R., Otepka, J., Pfeifer, N., Ghuffar, S., Korzeniowska, K., & Wagner, G. (2014). Automated Classification of Airborne Laser Scanning Point Clouds. In S. Koziel, L. Leifsson, & X.-S. Yang (Eds.), Solving Computationally Expensive Engineering Problems (pp. 269–292). Springer. https://doi.org/10.1007/978-3-319-08985-0_12 ( reposiTUm)

Otepka-Schremmer, J. (2023, May 9). Kontrollierte Gebäudemodellierung aus 3D Punktwolken [Conference Presentation]. 20. Internationales 3D Forum Lindau, Lindau, Germany. ( reposiTUm)

Otepka-Schremmer, J. (2023, January 26). Generic Neighborhood Definition for Point Cloud Analysis in OPALS [Conference Presentation]. 3rd International Workshop Point Cloud Processing (PCP2023), Stuttgart, Germany. ( reposiTUm)

Wild, B., Verhoeven, G. J., Ressl, C., Otepka-Schremmer, J., & Pfeifer, N. (2022, May 12). Towards the automatic production of graffiti orthophotos [Conference Presentation]. International graffiti symposium goINDIGO 2022, Vienna, Austria. https://doi.org/10.5281/zenodo.6574990 ( reposiTUm)

Bruggisser, M., Hollaus, M., Winiwarter, L., Otepka-Schremmer, J., Wang, D., Höfle, B., & Pfeifer, N. (2020). Impacts of acquisition patterns on the robustness and accuracy of tree models derived from UAV LiDAR for forest dynamic studies. 3D Tree Models for Forest Dynamics, Helsinki, Finland. http://hdl.handle.net/20.500.12708/83934 ( reposiTUm)

Bruggisser, M., Hollaus, M., Wang, D., Karel, W., Otepka-Schremmer, J., Pfeifer, N., & Bronner, G. (2019). Impact of Acquisition Characteristics of Unmanned Aerial Vehicle LiDAR Missions on the Quality of Derived Forest Metrics. SilviLaser 2019, Iguazu Falls, Brazil. http://hdl.handle.net/20.500.12708/83825 ( reposiTUm)

Winiwarter, L., Otepka-Schremmer, J., Mandlburger, G., & Thimian, G. (2017). Von Punktwolken zur Struktur im Gelände: Ableitung morphologischer Information mit OPALS. Deutscher Kongress für Geographie 2017, Tübingen, Germany. http://hdl.handle.net/20.500.12708/83560 ( reposiTUm)

Mandlburger, G., Wieser, M., Otepka-Schremmer, J., Pfennigbauer, M., & Pfeifer, N. (2014). Documentation of flood-induced changes of fluvial topography based on Airborne Laser Bathymetry. European LiDAR Mapping Forum 2014, Amsterdam, The Netherlands, EU. http://hdl.handle.net/20.500.12708/83251 ( reposiTUm)

Otepka-Schremmer, J. (2013). Features of Georeferenced Point Clouds: Definition and Computation. Europen Lidar Mapping Forum (ELMF), Amsterdam, The Netherlands, EU. http://hdl.handle.net/20.500.12708/83074 ( reposiTUm)

Mandlburger, G., Hollaus, M., Eysn, L., Mücke, W., Otepka-Schremmer, J., Karel, W., Briese, C., Zlinszky, A., Vetter, M., Melzer, T., Dorninger, P., & Pfeifer, N. (2013). 3D Punktwolken sind mehr wert ... VoGIS-Fachforum 2013, Feldkirch, Austria. http://hdl.handle.net/20.500.12708/83075 ( reposiTUm)

Otepka-Schremmer, J., Mandlburger, G., Karel, W., Wöhrer, B., & Roncat, A. (2011). Verteilte Prozessierung von ALS-Daten mittels Cloud-Computing - Erste Ergebnisse einer Pilotstudie. 16. Internationale geodätische Woche Obergurgl, Obergurgl, Austria. http://hdl.handle.net/20.500.12708/82679 ( reposiTUm)

Schütz, M., Mandlburger, G., Otepka-Schremmer, J., & Wimmer, M. (2019). Progressive Real-Time Rendering of One Billion Points Without Hierarchical Acceleration Structures (TR-193-02-2019-4). http://hdl.handle.net/20.500.12708/39813 ( reposiTUm)