Piermattei, L., Marty, M., Ginzler, C., Pöchtrager, M., Karel, W., Ressl, C., Pfeifer, N., & Hollaus, M. (2019). Pléiades satellite images for deriving forest metrics in the Alpine region. International Journal of Applied Earth Observation and Geoinformation, 80, 240–256. https://doi.org/10.1016/j.jag.2019.04.008 ( reposiTUm)

Piermattei, L., Karel, W., Wang, D., Wieser, M., Mokroš, M., Surový, P., Koreň, M., Tomaštík, J., Pfeifer, N., & Hollaus, M. (2019). Terrestrial Structure from Motion Photogrammetry for Deriving Forest Inventory Data. Remote Sensing, 11(8), 950. https://doi.org/10.3390/rs11080950 ( reposiTUm)

Milenković, M., Ressl, C., Karel, W., Mandlburger, G., & Pfeifer, N. (2018). Roughness Spectra Derived from Multi-Scale LiDAR Point Clouds of a Gravel Surface: A Comparison and Sensitivity Analysis. ISPRS International Journal of Geo-Information, 7(2), 69. https://doi.org/10.3390/ijgi7020069 ( reposiTUm)

Piermattei, L., Marty, M., Karel, W., Ressl, C., Hollaus, M., Ginzler, C., & Pfeifer, N. (2018). Impact of the Acquisition Geometry of Very High-Resolution Pléiades Imagery on the Accuracy of Canopy Height Models over Forested Alpine Regions. Remote Sensing, 10(10), 1542. https://doi.org/10.3390/rs10101542 ( reposiTUm)

Doneus, M., Wieser, M., Verhoeven, G., Karel, W., Fera, M., & Pfeifer, N. (2016). Automated Archiving of Archaeological Aerial Images. Remote Sensing, 8(3), 209. https://doi.org/10.3390/rs8030209 ( reposiTUm)

Wieser, M., Verhoeven, G., Briese, C., Doneus, M., Karel, W., & Pfeifer, N. (2014). Cost-effective geocoding with exterior orientation for airborne and terrestrial archaeological photography - possibilities and limitations. International Journal of Heritage in the Digital Era, 3(1), 97–121. https://doi.org/10.1260/2047-4970.3.1.97 ( 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)

Karel, W., Ghuffar, S., & Pfeifer, N. (2012). Modelling and Compensating Internal Light Scattering in Time of Flight Range Cameras. The Photogrammetric Record, 27(138), 155–174. http://hdl.handle.net/20.500.12708/163661 ( reposiTUm)

Karel, W., & Niedermayr, S. (2010). Photogrammetrie + Laserscanning = Range imaging. Österreichische Zeitschrift Für Vermessung Und Geoinformation (VGI), 98(2), 109–115. http://hdl.handle.net/20.500.12708/167114 ( reposiTUm)

Karel, W. (2008). Range Imaging: 3D-Punktwolken in Echtzeit. Österreichische Zeitschrift Für Vermessung Und Geoinformation (VGI), Begutachteter Beitrag, 96(1), 12–26. http://hdl.handle.net/20.500.12708/168958 ( reposiTUm)

Hollaus, M., Wagner, W., Eberhöfer, C., & Karel, W. (2006). Accuracy of large-scale canopy heights derived from LIDAR data under operational constraints in a complex alpine environment. ISPRS Journal of Photogrammetry and Remote Sensing, 60, 323–338. http://hdl.handle.net/20.500.12708/172232 ( reposiTUm)

Kraus, K., Karel, W., Briese, C., & Mandlburger, G. (2006). Local Accuracy Measures for Digital Terrain Models. The Photogrammetric Record, 21(No. 116), 342–354. http://hdl.handle.net/20.500.12708/172255 ( reposiTUm)

Karel, W. (2005). Erstellung eines photorealistischen 3-D Modells der Kirche San Juan del Hospital in Valencia/Spanien. Photogrammetrie, Fernerkundung, Geoinformation, 7, 544–545. http://hdl.handle.net/20.500.12708/172201 ( reposiTUm)

Bannakulpiphat, T., Karel, W., Ressl, C., & Pfeifer, N. (2024). Optimizing Bundle Block Adjustment for High-Overlap Small-Format Multi-Head Camera Systems. In F. Remondino, M. Shortis, & G. Vassena (Eds.), The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLVIII-2/W7-2024 (pp. 17–24). https://doi.org/10.5194/isprs-archives-XLVIII-2-W7-2024-17-2024 ( reposiTUm)

Karel, W. (2023). Deep Georeferencing of WWII Aerial Reconnaissance Images. In EGU General Assembly 2023. EGU General Assembly 2023, Wien, Austria. EGU. https://doi.org/10.5194/egusphere-egu23-17437 ( 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)

Flöry, S., Ressl, C., Puercher, G., Pfeifer, N., Hollaus, M., Bayr, A., & Karel, W. (2020). Development of a 3D Viewer for georeferencing and monoplotting of historical terrestrial images. In EGU General Assembly 2020 (EGU 2020). EGU General Assembly 2020, Vienna, Austria. Copernicus. https://doi.org/10.5194/egusphere-egu2020-22327 ( reposiTUm)

Ressl, C., Karel, W., Piermattei, L., Puercher, G., Hollaus, M., & Pfeifer, N. (2020). Multi-epoch bundle block adjustment for processing large dataset of historical aerial images. In EGU General Assembly 2020. EGU General Assembly 2020, Vienna, Austria. Copernicus. https://doi.org/10.5194/egusphere-egu2020-22544 ( reposiTUm)

Wenighofer, R., Galler, R., Karel, W., & Pfeifer, N. (2020). Efficient Digital Imaging for Full Face Rock Mass Evaluation in Hard Rock TBM Tunnelling. In ISRM International Symposium - EUROCK 2020 (pp. 1–7). OnePetro. http://hdl.handle.net/20.500.12708/44050 ( 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)

Karel, W., Piermattei, L., Wieser, M., Wang, D., Hollaus, M., Pfeifer, N., Surový, P., Koren, M., Tomastík, J., & Mokros, M. (2018). Terrestrial photogrammetry for forest 3D modelling at the plot level. In EGU General Assembly 2018. EGU General Assembly 2018, Vienna, Austria. Copernicus Publications. http://hdl.handle.net/20.500.12708/43827 ( reposiTUm)

Piermattei, L., Marty, M., Karel, W., Hollaus, M., Ginzler, C., & Pfeifer, N. (2018). Canopy height model from very high resolution Pléiades stereo images over mountain regions: influence of topography, acquisition and processing strategy. In EGU General Assembly 2018. EGU General Assembly 2018, Vienna, Austria. Copernicus Publications. http://hdl.handle.net/20.500.12708/43828 ( reposiTUm)

Piermattei, L., Bozzi, C. A., Mancini, A., Tassetti, A. N., Karel, W., & Pfeifer, N. (2017). Multispectral data processing from unmanned aerial vehicles: application in precision agriculture using different sensors and platforms. In EGU General Assembly 2017 (p. 1). Copernicus Publications. http://hdl.handle.net/20.500.12708/43663 ( reposiTUm)

Piermattei, L., Karel, W., Vettore, A., & Pfeifer, N. (2016). Acquisition strategies for terrestrial photogrammetric surveys. In EGU General Assembly 2016. EGU General Assembly 2016, Vienna, Austria. Copernicus Publications. http://hdl.handle.net/20.500.12708/43546 ( reposiTUm)

Gerke, M., Nex, F., Remondino, F., Jacobsen, K., Kremer, J., Karel, W., Hu, H., & Ostrowski, W. (2016). ORIENTATION OF OBLIQUE AIRBORNE IMAGE SETS – EXPERIENCES FROM THE  ISPRS/EUROSDR BENCHMARK ON MULTI-PLATFORM PHOTOGRAMMETRY. In The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 185–191). International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-archives-xli-b1-185-2016 ( reposiTUm)

Milenković, M., Karel, W., Ressl, C., & Pfeifer, N. (2016). A COMPARISON OF UAV AND TLS DATA FOR SOIL ROUGHNESS ASSESSMENT. In ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 145–152). ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-annals-iii-5-145-2016 ( reposiTUm)

Piermattei, L., Karel, W., Vettore, A., & Pfeifer, N. (2016). PANORAMA IMAGE SETS FOR TERRESTRIAL PHOTOGRAMMETRIC SURVEYS. In ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 159–166). ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-annals-iii-5-159-2016 ( reposiTUm)

Karel, W., Ressl, C., & Pfeifer, N. (2016). EFFICIENT ORIENTATION AND CALIBRATION OF LARGE AERIAL BLOCKS OF MULTI-CAMERA PLATFORMS. In The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 199–204). International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprs-archives-xli-b1-199-2016 ( reposiTUm)

Verhoeven, G., Karel, W., Štuhec, S., Doneus, M., Trinks, I., & Pfeifer, N. (2015). MIND YOUR GREY TONES – EXAMINING THE INFLUENCE OF DECOLOURIZATION METHODS ON INTEREST POINT EXTRACTION AND MATCHING FOR ARCHITECTURAL IMAGE-BASED MODELLING. In D. González-Aguilera, F. Remondino, J. Boehm, T. Kersten, & T. Fuse (Eds.), The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 307–314). ISPRS Archives. https://doi.org/10.5194/isprsarchives-xl-5-w4-307-2015 ( reposiTUm)

Chen, Y., Briese, C., Karel, W., & Pfeifer, N. (2014). True orthophoto generation using multi-view aerial images. In K. Schindler & N. Paparoditis (Eds.), The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 67–71). The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprsarchives-xl-3-67-2014 ( reposiTUm)

Karel, W., Doneus, M., Briese, C., Verhoeven, G., & Pfeifer, N. (2014). Investigation on the Automatic Geo-Referencing of Archaeological UAV Photographs by Correlation with Pre-Existing Ortho-Photos. In F. Remondino & F. Menna (Eds.), The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 307–312). The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. https://doi.org/10.5194/isprsarchives-xl-5-307-2014 ( reposiTUm)

Hollaus, M., Eysn, L., Karel, W., & Pfeifer, N. (2013). Growing stock change estimation using Airborne Laser Scanning data. In Proceedings of SilviLaser 2013. 13th International Conference on LiDAR Applications for Assessing Forest Ecosystems (SilviLaser 2013), Beijing, China, Non-EU. http://hdl.handle.net/20.500.12708/43324 ( reposiTUm)

Karel, W., Doneus, M., Verhoeve, G., Bries, C., Ressl, C., & Pfeifer, N. (2013). ORIENTAL – AUTOMATIC GEO-REFERENCING AND ORTHO-RECTIFICATION OF ARCHAEOLOGICAL AERIAL PHOTOGRAPHS. In ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (pp. 175–180). https://doi.org/10.5194/isprsannals-ii-5-w1-175-2013 ( reposiTUm)

Doneus, M., Verhoeven, G., Karel, W., Briese, C., Pfeifer, N., & Ressl, C. (2013). Towards an automated georeferencing and orthorectification of archaeological aerial photographs. In Archaeological prospection. Proceedings of the 10th International Conference on Archaeological Prospection (pp. 380–382). http://hdl.handle.net/20.500.12708/43104 ( reposiTUm)

Milenkovic, M., Eysn, L., Hollaus, M., Karel, W., & Pfeifer, N. (2012). Modeling the tree branch structure at very high resolution. In SilviLaser 2012 - Conference Proceedings (p. 8). http://hdl.handle.net/20.500.12708/43005 ( 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)

Karel, W., Ghuffar, S., & Pfeifer, N. (2010). Quantifying The Distortion Of Distance Observations Caused By Scattering In Time-Of-Flight Range Cameras. In The International Archives Of The Photogrammetry, Remote Sensing And Spatial Information Sciences (pp. 316–321). http://hdl.handle.net/20.500.12708/42572 ( 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)

Pfeifer, N., Ressl, C., & Karel, W. (2009). Range calibration for terrestrial laser scanners and range cameras. In SPIE Proceedings Vol. 7447, Videometrics, Range Imaging, and Applications X (pp. 1–15). http://hdl.handle.net/20.500.12708/42433 ( 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)

Karel, W., & Pfeifer, N. (2009). Range camera calibration based on image sequences and dense comprehensive error statistics. In SPIE Proceedings Vol. 7239, Three-Dimensional Imaging Metrology (p. 12). http://hdl.handle.net/20.500.12708/42307 ( reposiTUm)

Karel, W. (2008). Integrated Range Camera Calibration Using Image Sequences From Hand-Held Operation. In Proceedings (pp. 945–951). http://hdl.handle.net/20.500.12708/42225 ( reposiTUm)

Pfeifer, N., & Karel, W. (2008). Aufnahme von 3D-Punktwolken mit hoher zeitlicher Auflösung mittels aktiver Sensoren. In Beiträge der Oldenburger 3D Tage 2008 (pp. 2–13). Wichmann. http://hdl.handle.net/20.500.12708/42298 ( reposiTUm)

Karel, W., Dorninger, P., & Pfeifer, N. (2007). In Situ Determination Of Range Camera Quality Parameters By Segmentation. In International Conference on Optical 3-D Measurement Techniques VIII (pp. 109–116). http://hdl.handle.net/20.500.12708/42083 ( reposiTUm)

Karel, W., Pfeifer, N., & Briese, C. (2006). Dtm Quality Assessment. In ISPRS Technical Commission II Symposium 2006 (pp. 7–12). International Archives of the ISPRS. http://hdl.handle.net/20.500.12708/41984 ( reposiTUm)

Kraus, K., & Karel, W. (2006). Quality Parameters of DTMs. In Checking and Improving of Digital Terrain Models / Reliability of Direct Georeferencing, Official Publication No 51 (pp. 125–139). European Spatial Data Research (EuroSDR). http://hdl.handle.net/20.500.12708/42049 ( reposiTUm)

Karel, W. (2005). Sophisticated Use of Virtual Shapes of Architecture and Visualization of Quality. In S. Dequal (Ed.), International Cooperation to Save the World’s Cultural Heritage (pp. 882–887). International Archives of Photogrammetry Remote Sensing and Spatial Information Sciences. http://hdl.handle.net/20.500.12708/41916 ( reposiTUm)

Karel, W. (2005). The Creation of a Photo Model Considering a Refined Theory and Using Multiple Observation Types, and its Visualization together with its Quality Parameters. In H. Kahmen & A. Grün (Eds.), Optical 3-D Measurement Techniques VII (pp. 263–272). Research Group of Engineering Geodesy, Institute of Geodesy and Geophysics, TU Vienna. http://hdl.handle.net/20.500.12708/41936 ( reposiTUm)

Winkler, W., Bogensberger, B., Karel, W., Kistenich, M., Pacher, G., Pany, A., Roncat, A., Summer, G., Böhm, J., Hobiger, T., Weber, R., & Schuh, H. (2004). VIEPROJ1 - a students VLBI project. In General Meeting Proceedings (pp. 105–108). General Meeting Proceedings. http://hdl.handle.net/20.500.12708/41847 ( reposiTUm)

Verhoeven, G., Sevara, C., Karel, W., Ressl, C., Doneus, M., & Briese, C. (2013). Undistorting the Past: New Techniques for Orthorectification of Archaeological Aerial Frame Imagery. In Natural Science in Archaeology (pp. 31–67). Springer. https://doi.org/10.1007/978-3-319-01784-6_3 ( reposiTUm)

Pfeifer, N., Lichti, D., Böhm, J., & Karel, W. (2013). 3D Cameras: Errors, Calibration and Orientation. In TOF Range-Imaging Cameras (pp. 117–138). Springer. https://doi.org/10.1007/978-3-642-27523-4_6 ( reposiTUm)

Karel, W. (2008). Creating Architectural Photo Models using Close Range Photogrammetry. VDM Verlag Dr. Müller. http://hdl.handle.net/20.500.12708/22730 ( reposiTUm)

Karel, W. (2025, April 3). Historical Aerial Image Orientation [Keynote Presentation]. GEOMAT International Symposium, Romania. https://doi.org/10.34726/9132 ( reposiTUm)

Karel, W. (2022, September 8). Implicit Coarse and Explicit Fine Orientation ofWWII Images for UXO Detection [Presentation]. Talk at National Center of Cartography (NCC), Bucharest, Romania. ( reposiTUm)

Karel, W. (2022, December 6). Implicit / Deep Georeferencing of WWII Aerial Reconnaissance Images [Conference Presentation]. EuroSDR Workshop “Geoprocessing and Archiving of Historical Aerial Images,” Rome, Italy. ( 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)

Hollaus, M., Karel, W., Pfeifer, N., & Mandlburger, G. (2019). Studying Tree Growth Based on Multi-Temporal ALS Data. SilviLaser 2019, Iguazu Falls, Brazil. http://hdl.handle.net/20.500.12708/83824 ( reposiTUm)

Hollaus, M., Karel, W., Pfeifer, N., Bruggisser, M., Wieser, M., Bremer, M., Rutzinger, M., Wang, D., & Bronner, G. (2019). Unmanned Aerial System LiDAR data as basis for in-situ forest inventories. 255th IUFRO World Congress (IUFRO 2019), Curtiba, Brazil. http://hdl.handle.net/20.500.12708/83823 ( reposiTUm)

Piermattei, L., Karel, W., Wang, D., Wieser, M., Mokros, M., Surový, P., Koren, M., Tomastík, J., Pfeifer, N., & Hollaus, M. (2019). Applicability of terrestrial photogrammetry based on Structure from Motion for deriving plot-level forest parameters. A century of national forest inventories - informing past, present and future decisions. Celebrating the 100-year anniversary of the Norwegian National Forest Inventory, Sundvolden Hotel, Norway. http://hdl.handle.net/20.500.12708/83873 ( reposiTUm)

Karel, W., Remondino, F., & Pfeifer, N. (2019). Fehleranalyse von Punktbeobachtungenin schrägen Luftbildern. Dreiländertagung der OVG, DGPF und SGPF: Photogrammetrie - Fernerkundung - Geoinformation - 2019, Wien, Austria. http://hdl.handle.net/20.500.12708/83766 ( reposiTUm)

Piermattei, L., Marty, M., Karel, W., Ressl, C., Hollaus, M., Ginzler, C., & Pfeifer, N. (2018). Is Pléiades Stereo Satellite Imagery an Appropriate Data Source for the Generation of Alpine-Wide Canopy Height Models? EO 4 ALPS - The Alps from Space Workshop 2018, Innsbruck, Austria. http://hdl.handle.net/20.500.12708/83874 ( reposiTUm)

Karel, W., Mandlburger, G., Pfeifer, N., Korcz, D., & Wenzel, K. (2018). Benchmark-Ableitung historischer Orthophotos. 7. AdV-Workshop Ableitung von Historischen Orthophotos, Limburg an der Lahn, Germany. http://hdl.handle.net/20.500.12708/83656 ( reposiTUm)

Piermattei, L., Marty, M., Karel, W., Hollaus, M., Ginzler, C., & Pfeifer, N. (2018). Canopy height models from very high resolution Pléiades stereo images over mountain regions. ForestSAT 2018, College Park, Maryland, United States of America (the). http://hdl.handle.net/20.500.12708/83708 ( reposiTUm)

Piermattei, L., Karel, W., Wang, D., Wieser, M., Surový, P., Tomastík, J., Mokros, M., Hollaus, M., & Pfeifer, N. (2018). Accuracy of Plot-Level Forest Metrics from Terrestrial Photogrammetric Point Clouds. ForestSAT 2018, College Park, Maryland, United States of America (the). http://hdl.handle.net/20.500.12708/83710 ( reposiTUm)

Karel, W. (2017). OrientAL: Photogrammetry entering the forest. Honorary Workshop for Prof. Václav Korf, Prag, Czechia. http://hdl.handle.net/20.500.12708/83577 ( reposiTUm)

Verhoeven, G., Karel, W., Doneus, M., Wieser, M., & Pfeifer, N. (2017). OrientAL - towards (semi-)automated orthorectification of aerial photographs. Applying digital technology in research on building structures of the Lusatian culture fortified settlement in Biskupin, Site 4, Biskupin, Poland. http://hdl.handle.net/20.500.12708/83535 ( reposiTUm)

Karel, W., & Pfeifer, N. (2015). Analysis of Oblique Image Datasets with OrientAL. EuroSDR/ISPRS Workshop on “Oblique Cameras and Dense Image Matching,” Southampton, United Kingdom of Great Britain and Northern Ireland (the). http://hdl.handle.net/20.500.12708/83349 ( reposiTUm)

Pfeifer, N., Karel, W., Ghuffar, S., & Ressl, C. (2013). Studying Dynamic Scenes with Time of Flight Cameras. Seminar Fachgebiet Geomatik, Zürich, Non-EU. http://hdl.handle.net/20.500.12708/83013 ( reposiTUm)

Karel, W. (2013). Geometrische Kalibrierung von Range Cameras. Institut für Photogrammetrie und Geoinformation (IPI) an der Leibniz-Universität Hannover, Hannover, EU. http://hdl.handle.net/20.500.12708/83001 ( 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)

Grafl, A., Hollaus, M., Eysn, L., Karel, W., & Pfeifer, N. (2013). A novel approach for forest road detection based on ALS data and orthophotos. 13th International Conference on LiDAR Applications for Assessing Forest Ecosystems (SilviLaser 2013), Beijing, China, Non-EU. http://hdl.handle.net/20.500.12708/83155 ( 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)

Pfeifer, N., Ghuffar, S., Karel, W., Ressl, C., & Niedermayr, S. (2011). Range Imaging from Calibration to Modelling. International workshop on Range-Imaging Sensors and Applications, Italien, Trento, EU. http://hdl.handle.net/20.500.12708/82860 ( reposiTUm)

Karel, W. (2009). Photogrammetrie + Laserscanning = Range Imaging. 10. Österreichischer Geodätentag, Schladming, Austria. http://hdl.handle.net/20.500.12708/82447 ( reposiTUm)

Karel, W. (2006). Currículo de Fotogrametría en el Instituto de Fotogrametría y Teledetección (IPF) de Viena, Austria. Reunión Científica de Fotogrametría y Teledetección, niversidad de Salamanca, Ávila, Spanien, EU. http://hdl.handle.net/20.500.12708/81858 ( reposiTUm)

Karel, W. (2005). Erstellung eines photorealistischen 3-D Modells der Kirche San Juan del Hospital in Valencia / Spanien. 25. Wissenschaftlich-TechnisheJahrestagung der Deutschen Gesellschaft für Photogrammetrie und Fernerkundung, Rostock, Austria. http://hdl.handle.net/20.500.12708/81779 ( reposiTUm)

Kraus, K., & Karel, W. (2005). Quality Parameters of DTMs. EuroSDR, Seminar on “Automated Quality Control of Digital Terrain Models,” Aalborg, Dänemark, Austria. http://hdl.handle.net/20.500.12708/81727 ( reposiTUm)

Winkler, W., Bogensberger, B., Karel, W., Kistenich, M., Pacher, G., Pany, A., Roncat, A., Summer, G., Böhm, J., Hobiger, T., Weber, R., & Schuh, H. (2004). VIEPROJ1 - a students VLBI project. IVS General Meeting, Ottawa, Canada, Austria. http://hdl.handle.net/20.500.12708/81632 ( reposiTUm)

Karel, W. (2004). Erstellung eines photorealistischen 3D-Modells der Kirche San Juan del Hospital in Valencia [Diploma Thesis, Technische Universität Wien]. reposiTUm. http://hdl.handle.net/20.500.12708/185884 ( reposiTUm)