X. Li's research while affiliated with The University of Edinburgh and other places

Publications (9)

Article
NOAA/NESDIS a initié le programme “Alaska SAR Demonstration” dont l'objectif est de faire la démonstration du potentiel des images RSO en bande C de RADARSAT-1 à fournir une information utile et en temps opportun sur l'environnement et pour la gestion des ressources pour des utilisateurs en Alaska. Un des produits développés dans le cadre du progra...
Article
NOAA CoastWatch is an operational program that evolved from a harmful algal bloom (red tide) incidence in the East Coast of the US in 1987. It began as a weekly program of sea surface temperature (SST) analysis from the Advanced Very High Resolution Radiometer (AVHRR) and the surface wind field and advection forecasts. Through the leadership of the...
Article
Operational polar-orbiting NOAA satellites provide repetitive daily global coverage of the Earth. NESDIS has pioneered global production of Sea Surface Temperature (SST) from the Advanced Very High Resolution Radiometers (AVHRR) flown onboard NOAA satellites in the early 1980s and operational production has continued ever since. An important elemen...
Article
The Alaska Satellite Facility (ASF) has been processing synthetic aperture radar (SAR) data for research and for near-real-time applications demonstrations since shortly after the launch of the European Space Agency's ERS-1 satellite in 1991. The long coastline of Alaska, the vast extent of ocean adjacent to Alaska, a scarcity of in-situ observatio...
Article
The end goal of the satellite sensor's calibration is to make its radiances suitable for product generation. In turn, the product quality is often indicative of the sensor performance. This study explores two operational AVHRR products over ocean generated at NESDIS, the sea surface temperature (SST) and the Aerosol products, as indicators of the p...
Article
Cook Inlet, Alaska is an extremely dynamic system, with tidal range up to 9 m, maximum current up to 12 knots, and an average maximum surface current of 3 knots. The water depth is mostly between 20 and 40 m in the upper inlet. Since Cook Inlet is elongated, the strong current system tends to generate axial convergence fronts. Synthetic Aperture Ra...
Article
Full-text available
The satellite sea surface temperature (SST) research and development conducted at Oceanic Research and Applications Division (ORAD) is discussed. NOAA/NESDIS is responsible for developing and maintaining operational environmental satellite data products available for public access and distribution. NESDIS plays a leading role in the development, im...
Article
RADARSAT-1 synthetic aperture radar (SAR) satellite data acquired under a U.S-Canada agreement have proven very beneficial to National Oceanic and Atmospheric Administration (NOAA) National Environmental Satellite, Data, and Information Service (NESDIS) and to the National Ice Center (NIC) - a multi-agency operational center representing the Depart...

Citations

... Ship detection in high-resolution SAR images has attracted much attention due to its broad application prospects. Many traditional methods [8][9][10] have been proposed to detect multi-scale ships in complex environments. For example, [9,10] separated the land from the sea and then detected the object, and identified the object based on artificial features. ...
... These two arms are enough to provide a significant source of moisture into the boundary layer during the summer months. During the winter, some surface ice cover is typical on top of both arms, since they have an approximate depth between 60-80 feet, and currents are reduced to near 1 meter per second (m/s) (Li et al., 2004). And, to complicate matters, a mean diurnal tide range of 30.0 ft is observed in both arms (tidesandcurrents.noaa.gov). ...
... These algorithms were first developed and validated through a series of satellite SCAT missions and have been shown to be successful for wind speed retrieval from VVpolarized SARs onboard ERS-1, ERS-2 and ENVISAT (Lehner et al. 1998, Furevik and Korsbakken 2000, Horstmann et al. 2004, Horstmann and Koch 2005. Since the empirical C-band models were developed for VV polarization and are not directly applicable for horizontal (HH) polarization, to retrieve wind speed from horizontallypolarized SARs using these models, a polarization ratio function has to be considered first to obtain the normalized radar cross section (NRCS) at VV polarization (Thompson et al. 1998, Li et al. 1999, Horstmann et al. 2000, Thompson and Beal 2000, Vachon and Dobson 2000. ...