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Scattering structure features of targets is of great importance for Synthetic Aperture Radar (SAR) image analysis. In this paper, a novel algorithm for aircraft recognition in high resolution apron area of SAR images is proposed. The algorithm combines the strength of gradient saliency map and scattering structure features to improve accuracy and efficiency. Specially, Constant False-Alarm Rate (CFAR)...
Recently, the Optimal Spectral Sampling (OSS) method was implemented in a development version of the Community Radiative Transfer Model (CRTM) at JCSDA. This presentation describes the way that the OSS is implemented in CRTM, and some preliminary evaluation of the performance of the CRTM-OSS in comparison with CRTM-ODPS method. One of the important benefits of the OSS method is its capability to simulate...
To assimilate satellite-based passive microwave observation over heavy clouds and precipitation into numerical weather prediction (NWP) systems and thus to improve the performance of it has become an intensely studied topic. These attempts rely on the development of a radiative transfer (RT) model that accounts for particle scattering and accurately simulates the observation process at an acceptable...
Three years radiosoundings measurement at China were inputted in the Salonen-Uppala cloud detection algorithm to distinguish cloud layers, and to estimate cloud liquid water content therein, then atmospheric transmittances of China at frequencies of the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) were estimated using MPM and Mie theory. The validation expressed a good...
This research investigated the impact of Radio Occultation (RO) data assimilation on cyclone monitoring. The global positioning system (GPS) radio occultation limb sounding technique has appeared as an efficient global observing system. This technique cans provide good performance in all weather conditions and without calibration requirement. GPS RO data from the Constellation Observing System for...
We have concluded that before calculation of the AirMOSS project overall RMSE, not only the behavior and location of in-situ soil moisture probes need to be carefully evaluated but also the present error biases—associated with the in-situ probes, radar calibration, vegetation parameterization, forward model inaccuracy, and the inversion algorithm bias—need to be removed. Several measures have been...
Cloud detection is a key processing step before extracting information of earth surface from the earth observation data. Lots of schemes have been developed for cloud detection, static threshold method is the main method that is widely used in cloud detection. However, for the huge difference between different land objects, it is much difficult to find a proper threshold to detect the cloudy pixel...
Imaging period is an important consideration to geostationary interferometric microwave sounder (GIMS) when mapping fast changing target such as typhoon. GIMS simulation system with near real case observation target can evaluate system performance in different system configurations and thus help determine the optimal imaging period. In this paper, GIMS simulation system using MATLAB and near real...
Recently airborne SAR at very high frequencies, such as X- and Ku-bands, has been widely studied for many applications. In these studies, the backscatter properties at different frequencies have been well discussed. However, these properties of the urban objects and structures have not been sufficiently discussed yet. In this paper, we focus on evaluating the difference of Ku- and X-band SAR intensity...
A variational method based on 1Dvar is proposed to retrieve Integrated Precipitable Water vapor (IPW) in typhoon area from brightness temperatures measured by the Microwave Humidity and Temperature Sounder (MWHTS) on the Chinese Fengyun 3C (FY-3C) polar-orbit meteorological satellite. Water vapor values provided by European Centre for Medium-Range Weather Forecasts (ECMWF) were used as background...
The spectral within- and between-class variability of reed beds and reference species was evaluated in this study in order to determine the possibilities to discriminate reed beds from other green vegetation using airborne hyperspectral data. Five reed bed and five reference sites representing other greenish vegetation were chosen for this study, 15 sample plots at each site. The differences in within-class...
Numerical simulation of brightness temperatures of the Advanced Microwave Scanning Radiometer 2 (AMSR2) over the sea ice-open ocean-atmosphere system is fulfilled for non-precipitating conditions using a database of atmospheric meteorological parameter profiles, model profiles of cloud liquid water and published experimental data for sea ice emissivities. The results of numerical experiment show that...
In this paper we present a study on the use of remote sensing data combined to the 3D modeling of radiative transfer (RT) and energy balance in urban canopies in the aim to improve our knowledge on anthropogenic heat fluxes in several European cities (London, Basel, Heraklion, and Toulouse). The approach is based on the forcing by the use of LandSAT8 data of a coupled radiative transfer model DART...
Downward surface shortwave radiation (DSSR) is influenced by the atmosphere and mountainous topography. DEM scale is the key factor to affect the spatial distribution of DSSR in mode scale. In this paper, sensitivity of estimating DSSR to DEM scale is explored with six DEMs resolutions from 5-to 500-m based on our mountainous radiation algorithm published. According to the difference between the model...
Modeling, a common method in Earth science research, needs a significant amount of data for model initialization, validation, verification, and calibration. Most of those data requirements could be met by the Earth observation data and their derived products. However, currently the use of Earth observation data in modeling requires significant effort for data preparation. This paper presents a Web...
With a low cut-off for the directional wave spectra CFOSAT will impact both mixed sea and swell. The complementary use of CFOSAT and SAR wave spectra will enhance the impact of the assimilation and therefore induce a more accurate sea state. The CFOSAT mission is on one hand a big challenge for operational wave forecasting system, and on the other hand a good opportunity for wave modellers in order...
This paper investigates the deployment of multi-tethered InSAR system applied in GMTI missions. Since the baselines for GMTI are usually short, the tethers whose length is almost identical to the baselines are short as well. As a consequence, the deploy mechanism should not work under this condition to avoid the unsuccessful deployment caused by the output error of the mechanism. Hence, the free deployment...
The Chinese and French Space Agencies are jointly preparing an innovative mission, CFOSAT (China France Oceanography Satellite) devoted to the monitoring of the ocean surface and its related science and applications. This paper gives an overview of the scientific objectives, the mission and instrument characteristics, the expected data products and their performance.
Five possible mechanisms for the rain effects on the spaceborne C-band SAR observations are considered: 1) attenuation and 2) volume backscattering for the microwave transfer in atmosphere; as well as 3) rain - induced damping to the wind waves and 4) rain - generated ring waves on the ocean surface, and 5) diffraction on the sharp edges of rain products. A composite radar scattering model composed...
Surface soil moisture (SSM) is a significant variable in various fields of science. This paper aims to analyze and improve a SSM retrieval model to apply it to estimate SSM at the regional scale. Firstly, the model parameters were been analyzed. The rotation angle was transformed into exponential form and the ellipse center horizontal coordinate was decreased for the improved SSM retrieval model....
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