Results 41 to 50 of about 335,786 (287)

Radiometric Comparison within the Sentinel-1 SAR Constellation over a Wide Backscatter Range

Remote Sensing, 2020
Radiometric calibration adjusts the measured pixel intensity to a physical property, the radar cross section (RCS). After calibration, this relationship is defined over the entire backscatter range: from low image power (near noise) up to high ...
Kersten Schmidt, Marco Schwerdt, Nuno Miranda, Jens Reimann   +3 more
doaj   +1 more source

EFFECT OF DIFFERENT SEGMENTATION METHODS USING OPTICAL SATELLITE IMAGERY TO ESTIMATE FUZZY CLUSTERING PARAMETERS FOR SENTINEL-1A SAR IMAGES [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2018
Optical and SAR data are efficient data sources for shoreline monitoring. The processing of SAR data such as feature extraction is not an easy task since the images have totally different structure than optical imagery.
B. Bayram, N. Demir, B. Akpinar, S. Oy, F. Erdem, T. Vögtle, D. Z. Seker   +6 more
doaj   +1 more source

Sentinel-1A: Analysis of FDBAQ Performance on Real Data

IEEE Transactions on Geoscience and Remote Sensing, 2015
This paper concerns the performance of the flexible dynamic block adaptive quantizer (FDBAQ), which is the onboard data compression scheme used by Sentinel-1 (S-1), i.e., the C-band synthetic aperture radar (SAR) constellation whose first satellite (Sentinel-1A) has been launched on April 3, 2014. The data rate that results from the fine resolution and
Pietro Guccione, Michele Belotti, Davide Giudici, Andrea Monti-Guarnieri, Ignacio Navas Traver   +4 more
openaire   +1 more source

Preliminary Evaluation of Sentinel-1A Wind Speed Retrievals

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2016
The accuracy of wind speed retrievals from synthetic aperture radars (SARs) is strongly dependent upon the accuracy of the normalized radar cross section measurement. Here, we make a preliminary assessment of wind speed retrievals from Sentinel-1A. In particular, we use Sentinel-1A SAR imagery to compute wind speed at 500-m resolution.
Frank M. Monaldo, Christopher R. Jackson, Xiaofeng Li 0001, William G. Pichel   +3 more
openaire   +2 more sources

Assessment of Ocean Swell Height Observations from Sentinel-1A/B Wave Mode against Buoy In Situ and Modeling Hindcasts

Remote Sensing, 2022
Synthetic Aperture Radar (SAR) in wave mode is a powerful tool for monitoring sea states in terms of long-period ocean swells of a specific wave directional partition. Since 2016, SARs aboard Sentinel-1A/B operating in wave mode have provided ocean swell
He Wang, Alexis Mouche, Romain Husson, Antoine Grouazel, Bertrand Chapron, Jingsong Yang   +5 more
doaj   +1 more source

First Assessment of Sentinel-1A Data for Surface Soil Moisture Estimations Using a Coupled Water Cloud Model and Advanced Integral Equation Model over the Tibetan Plateau

Remote Sensing, 2017
The spatiotemporal distribution of soil moisture over the Tibetan Plateau is important for understanding the regional water cycle and climate change.
Xiaojing Bai, Binbin He, Xing Li, Jiangyuan Zeng, Xin Wang, Zuoliang Wang, Yijian Zeng, Zhongbo Su   +7 more
doaj   +1 more source

Comparison of Sentinel-1A Ascending and Descending Image Processing Results on the Tukul Dam Using SNAP Software

Jurnal Geografi
This study analysed and compared the accuracy of the results of Sentinel 1A satellite image processing in the ascending and descending orbit directions with SNAP software.
Faiz Mahbubi, Sukamta, Yudo Prasetyo
doaj   +1 more source

Radiometric accuracy and stability of sentinel-1A determined using point targets [PDF]

International Journal of Microwave and Wireless Technologies, 2018
ABSTRACTSentinel-1A is a space-borne synthetic aperture radar (SAR) system developed in the frame of the Copernicus Program. The German Aerospace Center supported the radiometric and polarimetric calibration of Sentinel-1A by the analysis of point target responses of several acquisitions considering different modes, beams, and polarization channels. An
Schmidt, Kersten, Tous Ramon, Núria, Schwerdt, Marco   +2 more
openaire   +2 more sources

Monitoring Deformasi Gunung Merapi Menggunakan Citra Sentinel-1A Dengan Menggunakan Metode DInSAR (Studi Kasus: Gunung Merapi, Jawa Tengah)

Rekayasa Hijau: Jurnal Teknologi Ramah Lingkungan, 2020
ABSTRAK Indonesia mempunyai 127 gunung api aktif yang tersebar dari Sabang sampai Merauke. Oleh karena itu, perlu adanya pemantauan aktivitas gunung api yang dapat digunakan untuk acuan mitigasi bencana.
Rian Nurtyawan, Lady Suci Utami
doaj   +1 more source

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source