5,475 research outputs found
Spatial predictions on physically constrained domains: Applications to Arctic sea salinity data
In this paper, we predict sea surface salinity (SSS) in the Arctic Ocean
based on satellite measurements. SSS is a crucial indicator for ongoing changes
in the Arctic Ocean and can offer important insights about climate change. We
particularly focus on areas of water mistakenly flagged as ice by satellite
algorithms. To remove bias in the retrieval of salinity near sea ice, the
algorithms use conservative ice masks, which result in considerable loss of
data. We aim to produce realistic SSS values for such regions to obtain more
complete understanding about the SSS surface over the Arctic Ocean and benefit
future applications that may require SSS measurements near edges of sea ice or
coasts. We propose a class of scalable nonstationary processes that can handle
large data from satellite products and complex geometries of the Arctic Ocean.
Barrier Overlap-Removal Acyclic directed graph GP (BORA-GP) constructs sparse
directed acyclic graphs (DAGs) with neighbors conforming to barriers and
boundaries, enabling characterization of dependence in constrained domains. The
BORA-GP models produce more sensible SSS values in regions without satellite
measurements and show improved performance in various constrained domains in
simulation studies compared to state-of-the-art alternatives. The R package is
available on https://github.com/jinbora0720/boraGP
Index to 1984 NASA Tech Briefs, volume 9, numbers 1-4
Short announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This index for 1984 Tech B Briefs contains abstracts and four indexes: subject, personal author, originating center, and Tech Brief Number. The following areas are covered: electronic components and circuits, electronic systems, physical sciences, materials, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences
Earth Resources: A continuing bibliography with indexes, issue 36
This bibliography lists 576 reports, articles, and other documents introduced into the NASA Scientific and Technical Information System between October 1 and December 31, 1982. Emphasis is placed on the use of remote sensing and geophysical instrumentation in spacecraft and aircraft to survey and inventory natural resources and urban areas. Subject matter is grouped according to agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis
Multiresolution optimal interpolation and statistical analysis of topex/podeidon satellite altimetry
Includes bibliographical references (p. 18-20).Supported by the Office of Naval Research. N00014-91-J-1004 Supported by the Draper Laboratory. DL-H-467133 Supported by the Air Force Office of Scientific Research. F49620-92-J-0002 Supported by the Natural Sciences and Engineering Research Council of Canada. NSERC-67 Supported by NASA. NAGW-1048Paul W. Fieguth ... [et al.]
Remote Sensing of the Aquatic Environments
The book highlights recent research efforts in the monitoring of aquatic districts with remote sensing observations and proximal sensing technology integrated with laboratory measurements. Optical satellite imagery gathered at spatial resolutions down to few meters has been used for quantitative estimations of harmful algal bloom extent and Chl-a mapping, as well as winds and currents from SAR acquisitions. The knowledge and understanding gained from this book can be used for the sustainable management of bodies of water across our planet
 Ocean Remote Sensing with Synthetic Aperture Radar
The ocean covers approximately 71% of the Earth’s surface, 90% of the biosphere and contains 97% of Earth’s water. The Synthetic Aperture Radar (SAR) can image the ocean surface in all weather conditions and day or night. SAR remote sensing on ocean and coastal monitoring has become a research hotspot in geoscience and remote sensing. This book—Progress in SAR Oceanography—provides an update of the current state of the science on ocean remote sensing with SAR. Overall, the book presents a variety of marine applications, such as, oceanic surface and internal waves, wind, bathymetry, oil spill, coastline and intertidal zone classification, ship and other man-made objects’ detection, as well as remotely sensed data assimilation. The book is aimed at a wide audience, ranging from graduate students, university teachers and working scientists to policy makers and managers. Efforts have been made to highlight general principles as well as the state-of-the-art technologies in the field of SAR Oceanography
Literature review of the remote sensing of natural resources
Abstracts of 596 documents related to remote sensors or the remote sensing of natural resources by satellite, aircraft, or ground-based stations are presented. Topics covered include general theory, geology and hydrology, agriculture and forestry, marine sciences, urban land use, and instrumentation. Recent documents not yet cited in any of the seven information sources used for the compilation are summarized. An author/key word index is provided
- …