Results 21 to 30 of about 6,939,496 (164)

Validation of Sentinel-3 OLCI Integrated Water Vapor Products Using Regional GNSS Measurements in Crete, Greece

Remote Sensing, 2020
Water vapor is one of the essential variables in monitoring the Earth’s climate. The Ocean and Land Color Instrument (OLCI) on-board the Copernicus Sentinel-3 missions measures the Integrated Water Vapor (IWV) column over land and ocean surfaces.
Stelios Mertikas, Panagiotis Partsinevelos, Achilleas Tripolitsiotis, Costas Kokolakis, George Petrakis, Xenophon Frantzis   +5 more
doaj   +1 more source

The ESA-EVE Polarization Lidar for Assessing the Aeolus Aerosol Product Perfomance [PDF]

EPJ Web of Conferences, 2020
We present the EVE lidar concept, a combined linear/circular polarization system, tailored to evaluate the spaceborne ALADIN Doppler lidar system aerosol retrievals. EVE, currently under development, aims to provide the ESA-Aeolus mission with a flexible,
Paschou Peristera, Proestakis Emmanouil, Tsekeri Alexandra, Siomos Nikos, Gkikas Antonis, Gialitaki Anna, Marinou Eleni, Binietoglou Ioannis, Meleti Charikleia, Freudenthaler Volker, Georgoussis George, Doxastakis George, Louri-das Alexandros, Von Bismarck Jonas, Amiridis Vassilis   +14 more
doaj   +1 more source

Absolute Calibration of the Chinese HY-2B Altimetric Mission with Fiducial Reference Measurement Standards

Remote Sensing, 2023
This research and collaboration work aims at the calibration and validation (Cal/Val) of the Chinese HY-2B satellite altimeter based upon two permanent Cal/Val facilities: (1) the China Altimetry Calibration Cooperation Plan in Qingdao, Bohai Sea and the Wanshan islands, China and (2) the permanent facility for altimetry calibration established by the ...
Stelios P. Mertikas, Mingsen Lin, Dimitrios Piretzidis, Costas Kokolakis, Craig Donlon, Chaofei Ma, Yufei Zhang 0016, Yongjun Jia, Bo Mu, Xenophon Frantzis, Achilles Tripolitsiotis, Lei Yang 0047   +11 more
openaire   +3 more sources

Fiducial-aided robust positioning of optical freeform surfaces

, 2018
Form characterization of a machined optical freeform surface demands for well alignment of the sampled measured data points on the machined surface and they are compared with the designed geometry of the surface through positioning.
Shixiang Wang (1702285), Chi Fai Cheung (8762772), Mingjun Ren (17681070), Samuel Liu (17172754)   +3 more
core   +4 more sources

Fifteen Years of Cal/Val Service to Reference Altimetry Missions: Calibration of Satellite Altimetry at the Permanent Facilities in Gavdos and Crete, Greece

Remote Sensing, 2018
Satellite altimetry provides exceptional means for absolute and undisputable monitoring of changes in sea level and inland waters (rivers and lakes), over regional to global scales, with accuracy and with respect to the center of mass of the Earth ...
Stelios P. Mertikas, Craig Donlon, Pierre Féménias, Constantin Mavrocordatos, Demitris Galanakis, Achilles Tripolitsiotis, Xenophon Frantzis, Ilias N. Tziavos, George Vergos, Thierry Guinle   +9 more
doaj   +1 more source

The ESA Permanent Facility for Altimetry Calibration: Monitoring Performance of Radar Altimeters for Sentinel-3A, Sentinel-3B and Jason-3 Using Transponder and Sea-Surface Calibrations with FRM Standards

Remote Sensing, 2020
This work presents the latest calibration results for the Copernicus Sentinel-3A and -3B and the Jason-3 radar altimeters as determined by the Permanent Facility for Altimetry Calibration (PFAC) in west Crete, Greece. Radar altimeters are used to provide
Stelios Mertikas, Achilleas Tripolitsiotis, Craig Donlon, Constantin Mavrocordatos, Pierre Féménias, Franck Borde, Xenophon Frantzis, Costas Kokolakis, Thierry Guinle, George Vergos, Ilias N. Tziavos, Robert Cullen   +11 more
doaj   +1 more source

Distance metric (Eq (1)) of fiducial markers for all the patients computed with the reference (top-left) and the sequential registration (top-right).

, 2022
End expiration was chosen as reference of measurements, i.e. 50% phase. The top figures show the distance between the estimated and the measured fiducial markers in all phases for all patients.
Signe Risum (13020450), José D. Tascón-Vidarte (13020447), Julien Jomier (13020453), Kenny Erleben (11707178), Line Bjerregaard Stick (8629392), Mirjana Josipovic (837624), Ivan Richter Vogelius (8629407), Sune Darkner (3819118)   +7 more
core   +1 more source

Example of Monte Carlo Method Uncertainty Evaluation for Above-Water Ocean Colour Radiometry

Remote Sensing, 2020
We describe a method to evaluate an uncertainly budget for the in situ Ocean Colour Radiometric measurements. A Monte Carlo approach is chosen to propagate the measurement uncertainty inputs through the measurements model.
Agnieszka Białek, Sarah Douglas, Joel Kuusk, Ilmar Ansko, Viktor Vabson, Riho Vendt, Tânia Casal   +6 more
doaj   +1 more source

A Virtual Geostationary Ocean Color Sensor to Analyze the Coastal Optical Variability

Remote Sensing, 2020
In the coastal environment the optical properties can vary on temporal scales that are shorter than the near-polar orbiting satellite temporal resolution (~1 image per day), which does not allow capturing most of the coastal optical variability.
Marco Bracaglia, Rosalia Santoleri, Gianluca Volpe, Simone Colella, Mario Benincasa, Vittorio Ernesto Brando   +5 more
doaj   +1 more source

Results from Verification of Reference Irradiance and Radiance Sources Laboratory Calibration Experiment Campaign

Remote Sensing, 2020
We present the results from Verification of Reference Irradiance and Radiance Sources Laboratory Calibration Experiment Campaign. Ten international laboratories took part in the measurements.
Agnieszka Białek, Teresa Goodman, Emma Woolliams, Johannes F. S. Brachmann, Thomas Schwarzmaier, Joel Kuusk, Ilmar Ansko, Viktor Vabson, Ian C. Lau, Christopher MacLellan, Sabine Marty, Michael Ondrusek, William Servantes, Sarah Taylor, Ronnie Van Dommelen, Andrew Barnard, Vincenzo Vellucci, Andrew C. Banks, Nigel Fox, Riho Vendt, Craig Donlon, Tânia Casal   +21 more
doaj   +1 more source