15 results on '"Aloysius Wehr"'
Search Results
2. Biological Earth observation with animal sensors
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Walter Jetz, Grigori Tertitski, Roland Kays, Uschi Mueller, Martin Wikelski, Susanne Åkesson, Yury Anisimov, Aleksey Antonov, Walter Arnold, Franz Bairlein, Oriol Baltà, Diane Baum, Mario Beck, Olga Belonovich, Mikhail Belyaev, Matthias Berger, Peter Berthold, Steffen Bittner, Stephen Blake, Barbara Block, Daniel Bloche, Katrin Boehning-Gaese, Gil Bohrer, Julia Bojarinova, Gerhard Bommas, Oleg Bourski, Albert Bragin, Alexandr Bragin, Rachel Bristol, Vojtěch Brlík, Victor Bulyuk, Francesca Cagnacci, Ben Carlson, Taylor K. Chapple, Kalkidan F. Chefira, Yachang Cheng, Nikita Chernetsov, Grzegorz Cierlik, Simon S. Christiansen, Oriol Clarabuch, William Cochran, Jamie Margaret Cornelius, Iain Couzin, Margret C. Crofoot, Sebastian Cruz, Alexander Davydov, Sarah Davidson, Stefan Dech, Dina Dechmann, Ekaterina Demidova, Jan Dettmann, Sven Dittmar, Dmitry Dorofeev, Detlev Drenckhahn, Vladimir Dubyanskiy, Nikolay Egorov, Sophie Ehnbom, Diego Ellis-Soto, Ralf Ewald, Chris Feare, Igor Fefelov, Péter Fehérvári, Wolfgang Fiedler, Andrea Flack, Magnus Froböse, Ivan Fufachev, Pavel Futoran, Vyachaslav Gabyshev, Anna Gagliardo, Stefan Garthe, Sergey Gashkov, Luke Gibson, Wolfgang Goymann, Gerd Gruppe, Chris Guglielmo, Phil Hartl, Anders Hedenström, Arne Hegemann, Georg Heine, Mäggi Hieber Ruiz, Heribert Hofer, Felix Huber, Edward Hurme, Fabiola Iannarilli, Marc Illa, Arkadiy Isaev, Bent Jakobsen, Lukas Jenni, Susi Jenni-Eiermann, Brett Jesmer, Frédéric Jiguet, Tatiana Karimova, N. Jeremy Kasdin, Fedor Kazansky, Ruslan Kirillin, Thomas Klinner, Andreas Knopp, Andrea Kölzsch, Alexander Kondratyev, Marco Krondorf, Pavel Ktitorov, Olga Kulikova, R. Suresh Kumar, Claudia Künzer, Anatoliy Larionov, Christine Larose, Felix Liechti, Nils Linek, Ashley Lohr, Anna Lushchekina, Kate Mansfield, Maria Matantseva, Mikhail Markovets, Peter Marra, Juan F. Masello, Jörg Melzheimer, Myles H.M. Menz, Stephen Menzie, Swetlana Meshcheryagina, Dale Miquelle, Vladimir Morozov, Andrey Mukhin, Inge Müller, Thomas Mueller, Juan G. Navedo, Ran Nathan, Luke Nelson, Zoltán Németh, Scott Newman, Ryan Norris, Olivier Nsengimana, Innokentiy Okhlopkov, Wioleta Oleś, Ruth Oliver, Teague O’Mara, Peter Palatitz, Jesko Partecke, Ryan Pavlick, Anastasia Pedenko, Alys Perry, Julie Pham, Daniel Piechowski, Allison Pierce, Theunis Piersma, Wolfgang Pitz, Dirk Plettemeier, Irina Pokrovskaya, Liya Pokrovskaya, Ivan Pokrovsky, Morrison Pot, Petr Procházka, Petra Quillfeldt, Eldar Rakhimberdiev, Marilyn Ramenofsky, Ajay Ranipeta, Jan Rapczyński, Magdalena Remisiewicz, Viatcheslav Rozhnov, Froukje Rienks, Vyacheslav Rozhnov, Christian Rutz, Vital Sakhvon, Nir Sapir, Kamran Safi, Friedrich Schäuffelhut, David Schimel, Andreas Schmidt, Judy Shamoun-Baranes, Alexander Sharikov, Laura Shearer, Evgeny Shemyakin, Sherub Sherub, Ryan Shipley, Yanina Sica, Thomas B. Smith, Sergey Simonov, Katherine Snell, Aleksandr Sokolov, Vasiliy Sokolov, Olga Solomina, Mikhail Soloviev, Fernando Spina, Kamiel Spoelstra, Martin Storhas, Tatiana Sviridova, George Swenson, Phil Taylor, Kasper Thorup, Arseny Tsvey, Marlee Tucker, Sophie Tuppen, Woody Turner, Innocent Twizeyimana, Henk van der Jeugd, Louis van Schalkwyk, Mariëlle van Toor, Pauli Viljoen, Marcel E. Visser, Tamara Volkmer, Andrei Volkov, Sergey Volkov, Oleg Volkov, Jan A.C. von Rönn, Bernd Vorneweg, Bettina Wachter, Jonas Waldenström, Natalie Weber, Martin Wegmann, Aloysius Wehr, Rolf Weinzierl, Johannes Weppler, David Wilcove, Timm Wild, Hannah J. Williams, John Wilshire, John Wingfield, Michael Wunder, Anna Yachmennikova, Scott Yanco, Elisabeth Yohannes, Amelie Zeller, Christian Ziegler, Anna Zięcik, Cheryl Zook, University of St Andrews. School of Biology, University of St Andrews. Centre for Biological Diversity, University of St Andrews. Centre for Social Learning & Cognitive Evolution, Piersma group, Animal Ecology (AnE), Dutch Centre for Avian Migration & Demography, and Netherlands Institute of Ecology (NIOO)
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Conservation of Natural Resources ,сбор данных ,GE ,Earth, Planet ,QH301 Biology ,Movement ,T-NDAS ,биологические наблюдения ,Земля, планета ,Animal sensors ,Animal tracking-based Earth observation ,QH301 ,SDG 3 - Good Health and Well-being ,дистанционное зондирование ,Settore BIO/07 - ECOLOGIA ,ddc:570 ,животные ,Animals ,Movement [MeSH] ,Ecology, Evolution, Behavior and Systematics ,Conservation of Natural Resources [MeSH] ,Ecosystem [MeSH] ,Animals [MeSH] ,Earth, Planet [MeSH] ,датчики ,Ecosystem ,GE Environmental Sciences - Abstract
Space-based tracking technology using low-cost miniature tags is now delivering data on fine-scale animal movement at near-global scale. Linked with remotely sensed environmental data, this offers a biological lens on habitat integrity and connectivity for conservation and human health; a global network of animal sentinels of environmental change. Publisher PDF
- Published
- 2022
3. Von der 3D-Digitalisierung über die Mustererkennung zur Fertigung.
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Marinos Ioannides and Aloysius Wehr
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- 1993
- Full Text
- View/download PDF
4. Mobile Panoramic Mapping using CCD-Line Camera and Laser Scanner.
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Ralf Reulke, Aloysius Wehr, and Denis Griesbach
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- 2004
5. Some examples of European activities in airborne laser techniques and an application in glaciology
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Aloysius Wehr, Etienne Favey, Hans-Gert Kahle, and Alain Geiger
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Glaciology ,Geophysics ,Photogrammetry ,Laser altimetry ,Laser scanning ,law ,Remote sensing (archaeology) ,Terrain ,Laser ,Geology ,Earth-Surface Processes ,Remote sensing ,law.invention - Abstract
Airborne Laser Altimetry (ALA) has experienced a rapid increase in popularity as a method serving a wide range of applications in Remote Sensing, Geodesy, Geophysics and Geodynamics. Besides the ‘traditional’ approach of using laser scanning solely as a supplement for photogrammetry in acquiring digital terrain models, ALA has also been applied to various geoscience research problems. After a short overview of airborne laser altimetry activities in Europe, an application of airborne laser scanning dedicated to Alpine Glaciology is presented.
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- 2002
6. Airborne laser scanning—an introduction and overview
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Uwe Lohr and Aloysius Wehr
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Data processing ,Laser scanning ,business.industry ,Orientation (computer vision) ,Computer science ,Instrumentation ,Measure (physics) ,Terrain ,Laser ,Atomic and Molecular Physics, and Optics ,Computer Science Applications ,law.invention ,Optics ,law ,Global Positioning System ,Computers in Earth Sciences ,business ,Engineering (miscellaneous) ,Remote sensing - Abstract
This tutorial paper gives an introduction and overview of various topics related to airborne laser scanning (ALS) as used to measure range to and reflectance of objects on the earth surface. After a short introduction, the basic principles of laser, the two main classes, i.e., pulse and continuous-wave lasers, and relations with respect to time-of-flight, range, resolution, and precision are presented. The main laser components and the role of the laser wavelength, including eye safety considerations, are explained. Different scanning mechanisms and the integration of laser with GPS and INS for position and orientation determination are presented. The data processing chain for producing digital terrain and surface models is outlined. Finally, a short overview of applications is given.
- Published
- 1999
7. LiDAR Systems and Calibration
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Aloysius Wehr
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Lidar ,Link budget ,Position (vector) ,Computer science ,Orientation (computer vision) ,Group method of data handling ,Calibration ,Ranging ,Remote sensing ,Whole systems - Abstract
This chapter discusses the applied ranging principles and the achievable ranging accuracy is estimated by link budget calculations. It presents the Light Detection and Ranging (LiDAR) link budget calculation that was reduced to the simpler forms in order to highlight the key parameters that govern instrument performance. For understanding the functioning of the different LiDARs, for evaluating the performance of the instrument components and for selecting the right components appropriate for specific surveying tasks, the principles of LiDAR systems are described by subdividing the whole system into functional subunits. Most LiDARs are realized with conventional optics. Data handling for fullwave recording LiDARs is even more demanding, because the full receive pulse shape is digitized rather than simply ranging to its leading edge. The combination of LiDAR and Position and orientation system (POS) units may vary from survey to survey, and for research purposes often several POS are flown together for comparative studies.
- Published
- 2008
8. LIDAR: Airborne and terrestrial sensors
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Aloysius Wehr
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Lidar ,Environmental science ,Remote sensing - Published
- 2008
9. Mobile Panoramic Mapping Using CCD-Line Camera and Laser Scanner with Integrated Position and Orientation System
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Ralf Reulke, Denis Griesbach, and Aloysius Wehr
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Laser scanning ,Orientation (computer vision) ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Navigation system ,Geography ,Inertial measurement unit ,Position (vector) ,Computer graphics (images) ,Line (geometry) ,Computer vision ,Artificial intelligence ,Differential GPS ,Projection (set theory) ,business - Abstract
The fusion of panoramic camera data with laser scanner data is a new approach and allows the combination of high-resolution image and depth data. Application areas are city modelling, virtual reality and documentation of the cultural heritage. Panoramic recording of image data is realized by a CCD-line, which is precisely rotated around the projection centre. In the case of other possible movements, the actual position of the projection centre and the view direction has to be measured. Linear moving panoramas e.g. along a wall are an interesting extension of such rotational panoramas. Here, the instantaneous position and orientation determination can be realized with an integrated navigation system comprising differential GPS and an inertial measurement unit. This paper investigates the combination of a panoramic camera and a laser scanner with a navigation system for indoor and outdoor applications. First it will be reported about laboratory experiments, which were carried out to obtain valid parameters about the surveying accuracy achievable with both sensors panoramic camera and laser scanner respectively. Then out door surveying results using a position and orientation system as navigation sensor will be presented and discussed.
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- 2006
10. Advanced processing capabilities with imaging laser altimeter ScaLARS
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Aloysius Wehr and Karl-Heinz Thiel
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Orientation (computer vision) ,business.industry ,Feature extraction ,Elevation ,Ranging ,Filter (signal processing) ,Laser ,Object detection ,law.invention ,Geography ,law ,Computer vision ,Artificial intelligence ,Altimeter ,business ,Remote sensing - Abstract
The Institute of Navigation/University Stuttgart has developed an airborne Scanning Laser Altitude and Reflectance Sensor. This paper describes an approach to automatically detect and extract artificial surface objects using the data of imaging laser altimeters. Laser altimeters register surface topography directly in three spatial dimensions by measuring the distance to individual surface points. Beyond mere ranging advanced imaging laser altimeters like the Scanning Laser Altitude and Reflectance Sensor (ScaLARS) are also able to actively measure surface reflectance. By fusing both the 3-D geometry and surface reflectance, object detection and identification can be done automatically. In a first step, surface objects are detected by applying a morphology-based filter to the elevation data. In order to detect also large buildings which tend to make morphological filtering fail an additional approach based on a progressive local histogram analysis of elevation is used. The detected surface objects are then separated into artificial objects (buildings) and natural objects (vegetation) in the second step, using surface reflectance data, and/or elevation 'texture' and surface orientation. To demonstrate the effectiveness of these identification criteria, they are applied to a test data set collected with the ScaLARS laser altimeter.
- Published
- 1999
11. 3D-imaging laser scanner for close-range metrology
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Aloysius Wehr
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Engineering ,Scanner ,Laser diode ,Laser scanning ,business.industry ,Ranging ,Slant range ,Laser ,law.invention ,Semiconductor laser theory ,Metrology ,Optics ,law ,business - Abstract
This paper presents a 3D-Imaging Laser Scanner (3D-ILS) for close range survey for up to 10 meters. The 3D-ISL is eyesafe and works with a visible semiconductor laser diode transmitting at 670 nm. The large ranging dynamic is achieved by measuring the phase difference between the transmitted and received intensity modulated signal. Due to the high modulation frequency of 314 MHz measurement accuracies about 0.1 mm are possible with high measurement rates. Besides the slant range, the system detects laser light backscattered from the object surface under survey. This means that three dimensional images are obtained, if the scanner moves the laserbeam line by line across the object's surface. After explaining the functioning of the 3D-ILS and calculating the theoretical slant ranging performance, typical application examples will be presented which verify the theoretical results and demonstrate the wide application field for the laser scanner which is e.g. CAD, CAM, rapid prototyping, close range-, industrial- and architectural-survey. An application highlight is the survey of a reconstructed skeleton of a dinosaur.
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- 1999
12. Fast digital survey of historical sites and monuments by using the 4D LaserScanner system
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Aloysius Wehr and T. Kleiner
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Conservation ,Upload ,Engineering drawing ,Engineering ,Software ,business.industry ,Optical engineering ,business ,Partition (database) ,Cartography - Abstract
At the Institute of Navigation a new method of surveying historical sites and monuments has been developed and applied in field experiments. This method uses a 4D LaserScanner and sophisticated software to measure the 3D structure of the observed object and to partition and abstract the object's surface for automatic plan-drawing generation. By showing typical measurements and evaluation results, the application possibilities of the new method for conservation and restoration of historical buildings is demonstrated.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
- Published
- 1994
13. Volume reconstruction by using 4D object surface data
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Aloysius Wehr and M. Ioannides
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Surface (mathematics) ,Range (mathematics) ,Triangulation (geometry) ,Sampling (signal processing) ,business.industry ,Computer science ,Feature (computer vision) ,Pattern recognition (psychology) ,Computer vision ,Artificial intelligence ,business ,Object (computer science) ,Volume (compression) - Abstract
Today non contacting optical 3D-digitizers feature high sampling rates and are capable of obtaining highly resolved 3D images of object surfaces. In general thesedigital range images contain a large amount of data and require powerful computersand large memories for further processing. It will be shown that the number of datacan be reduced by eliminating the redundant information contained in digital rangeimages by applying pattern recognition techniques. Surface generation, contour linesgeneration, triangulation and volume generation, will be explained for the differentoperation levels with respect to CAD/CAM. 1. Introduction Today 3D-Digitizers with an optical sensor feature high sampling rates and the abilityof digitizing complex objects and object surlaces in practical times. Due to the highsampling rate, the 3D measurement points are located so close to each other on theobject's surface that a highly resolved image is obtained. However, these digitalrange images contain a large amount of data with no relevance for volume oriented
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- 1994
14. Auslegungskriterien für ein abbildendes CW-Laserentfernungsmeßsystem und seine Realisierung (Teil I)
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Aloysius Wehr
- Subjects
Electrical and Electronic Engineering - Published
- 1994
15. 3D-Mapping by a Semiconductor Laser Scanner, Description of an Experimental Setup
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Aloysius Wehr
- Subjects
Laser scanning ,Computer science ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Laser ,Avalanche photodiode ,law.invention ,Semiconductor ,Optics ,3d mapping ,Remote sensing (archaeology) ,law ,Grey level ,business - Abstract
An experimental setup of a semiconductor laser scanner for 3D-mapping is described. First measurement results are presented. The experimental results are discussed and estimations for a future remote sensing system are given. Finally the main possibilities for applications of a semiconductor laser mapper are identified.
- Published
- 1989
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