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In order to meet the need of continuous development of three dimensional (3D) Geographic Information System (GIS), we apply an algorithm that efficiently builds a compact sparse octree into GIS. The algorithm is based on the fast GPU hardware rasterization, which builds the octree structure from top level to bottom level at the same time. Therefore the graphics based parallel algorithm can accelerate...
FUTUREVOLC is a collaborative project funded through the FP7 Environment Supersite Concept call encompassing 26 partners in 10 countries. The main objectives of FUTUREVOLC are to establish an integrated volcanological monitoring procedure through European collaboration, develop new methods to evaluate volcanic crises, increase scientific understanding of magmatic processes and improve delivery of...
Geohazard Supersites have been founded to stimulate international and intergovenmental efforts to monitor and study geologically interesting sites by establishing a portal to, or ideally open-access to, relevant datasets. Integrating various geophysical data gives us deeper insights into the mechanics of earthquakes, volcano eruptions, and other geological hazards. Here I overview how the remote sensing...
The GPM core satellite will be ready to launch in February 2014, less than 7 months after the end of IGARSS2013 symposium. In the pre-launch era, several international validation experiments such as LPVEX (Light Precipitation Validation Experiment), MC3E (Midlatitude Continental Convective Clouds Experiment), and IFloodS (Iowa Flood Studies) have already generated a substantial set of measurements...
Satellite based High Resolution Precipitation Product (HRPP) (generally with a temporal resolution of 3h and spatial resolution of 0.25°×0.25°) is a valuable data source in global and regional hydroclimatologic applications. However uncertainty information for most of the satellite-based HRPPs is unavailable up to present. This paper presents a statistical evaluation study of daily TMPA research time...
An analysis of the polarimetric scattering properties of oil-covered waters is conducted using the classic Poincaré ellipticity parameter chi (χ) from the Stokes parameters of hybrid polarized mode Synthetic Aperture Radar (SAR). For natural oil seeps, χ has a change in signs, comparing oil-covered waters with the ‘clean’ ocean surface. The χ sign reversal is basic to sign difference oil spill detection...
Ecological services provided by coral reefs are threatened by complex dynamics of global and local drivers. Fostering an appropriate management at local scale may enhance the resilience of the coral reefs facing large-scale issues, more laboriously manageable. We propose to model a bespoke reef health index (RHI) using a comprehensive dataset of socio-ecological variables and the Boosted Regression...
Currently, spatial light attenuation and water clarity can be estimated from diffuse attenuation coefficient at wavelength 490 nm (Kd490) available from satellite data. In the present study, we investigated the performance of existing satellite Kd490 algorithms in near-shore seagrass environment using available in situ data. We also examined the use of moderate-spatial resolution, multispectral imagery...
Gulf is a significant region to study due to its economic importance with large number of ports and hydrological significance for its extreme tidal circulation. Remote sensing data of both physical and biological parameters is assimilated using Empirical Orthogonal Function (EOF) and multiscale objective analysis and incorporated into a three dimensional mathematical model to simulate the plankton...
This study presents a set of security and emergency services derived from different satellite missions. Areas of application cover pre-frontier intelligence, critical assets monitoring and emergency mapping for emergency response. Security is a novel sphere for remote sensing: the launching of commercial sub-metric multispectral and radar missions has open operative horizons for satellite security...
Comparison of elevations from TanDEM-X DEM of the year 2011 with C- band Shuttle Radar Topography Mission (SRTM) DEM acquired in February 2000 was carried out for the rugged terrain of Northwest Indian Himalaya. The aim was to evaluate the usage of the two DEMs for the study of glacier elevation change, volume loss and hence geodetic mass balance of in-accessible glaciers of Himalaya. Furthermore,...
We present a technique to extract geophysical parameters of nearshore ocean breaking waves (e.g., wave height, wave velocity) from ATI SAR data. The technique exploits the azimuthal shift induced by moving scatterers in SAR imagery. We find that length of the azimuthal streaks are correlated with breaking wave height (correlation coefficient is 0.78) for a range of wave conditions. We also outline...
Ionosphere has different stratification at different height, so it's index of refraction varies with height. When radar's echo signals transmit through the ionosphere, the real propagation path is not the ideal straight line, in fact, it will inflect to a certain extent. For the spaceborne synthetic aperture radar (SAR) system, the imaging precision has been decreased both in azimuth section and range...
ScanSAR ScanSAR differential interferometric technique is a very powerful tool in order to detect the wide crustal deformation caused by huge earthquakes.
Change detection is an application to which SAR is particularly well suited since SARs can consistently produce high quality fine resolution imagery from multiple repeat pass collections. The aim of this paper is to extract all possible information from SAR-InSAR data and to asses to which extent this information can be exploited for change detection purposes in Hong Kong. We collaborate with Planning...
In this paper, an efficient geography registration method for INSAR coherent change detection is proposed. In the algorithm, considering Terra-SAR image, firstly we do geography registration on two images by oversampling the geography information in master image, then do coarse and fine registration. In coarse registration, find the range and azimuth shifts by calculating the cross correlation of...
Primarily the article briefly introduces the basic concept of the flat earth removal and baseline estimation, and mainly introduces the method of flat earth removal and baseline estimation based on orbit parameters using Radarsat-2 image, in detail represents the processing of flat earth removal based on orbit parameters. By removing the flat earth phase of the interferogram and analyzing the result...
Inversing the surface wave spectrum from SAR (Synthetic Aperture Radar) is widely used to obtain the ocean wave parameters in a large ocean area. Considering that the ocean wave is affected by the water depth factor in coastalarea, this study focuses on the inversion of wave parameters in shallow ocean area from SAR images, and using the shallow water TMA spectrum as the first-guess spectrum to develop...
This work presents a novel technique for the determination of soil moisture obtaining 2-D Soil Moisture (SM) information with a single instrument. Both the instrument and the retrieval algorithm used, which is based on inferring the reflection coefficient of the terrain by direct and forward scattering polarimetric measurements of Global Navigation Satellite Systems (GNSS) Signals, are briefly described...
In the last years, the GPS signals have been validated as opportunity signals in a wide range of reflectometry-based remote sensing applications for sea, land or ice scenarios. Recently, the first Galileo satellites have started transmitting the new signal E1, which shares the band with the GPS L1 signal. This work compares the performance of both signals in space and airborne scenarios for sea state...
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