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Retrieval of Sea Surface Wind Speed from ADEOS/POLDER Data
Izumiya, Toshiaki,Kawata, Yoshiyuki 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
It is possible to retrieve sea surface wind speeds by analyzing the reflectance data in the sun glitter direction measured from space. We have presented the retrieved results of sea surface wind speeds along the sun glitter points which were seen in ADEOS/POLDER's one-path scene. The retrieval was performed by the look-up table method, based on the theoretical relationship between the sun glitter reflectance peak value and sea surface wind speed. In this retrieval we used POLDER'S reflectance data in 670nm band. Furthermore, we also used aerosol's three optical parameters, namely, the optical thickness at 500nm, Ångstro¨m exponent, and the real part of refractive index, which were pre-estimated by using both POLDER'S directional reflectance and directional linear polarization data in the same 670nm band.
Kawata, Yoshiyuki,Izumiya, Toshiaki 대한원격탐사학회 1999 International Symposium on Remote Sensing Vol.15 No.1
We proposed a new retrieval method far aerosol's real part of refractive index, optical thickness, and Angstrom exponent, using POLDPR's directional reflectance and polarization data. We showed that aerosol's real part of refractive index can be retrieved systematically using multi-directional P-R(polarization and reflectance) diagrams in a single infrared band by our algorithm far the first time. We examined, the retrieves results, by comparing with the simultaneously measured sky observation data at the study site and we obtained a reasonable agreement between them.
Retrieval of Aerosol Optical Parameters from Satellite Image Data Over the Seas
Kimura, Yasuyuki,Izumiya, Toshiaki,Kawata, Yoshiyuki 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
It is possible to retrieve aerosol's three optical parameters, namely, its optical thickness ie(500) at the wavelength of 500nm, Angstrom exponent a, and real part of refractive index Nr, from satellite data by analyzing the observed reflectance and polarization information. In this retrieval we applied the directional R-P(Reflectance-Polarization) algorithm to ADEOS/POLDER's 865nm band data. This retrieval algorithm was proposed previously in our paper[1] at EMSEA in 1999 and we extend our previous studies in this study. The retrieved results were compared with the sky observation data at our validation site from April 16 to July 24, 1997. We found that the correlation coefficient between the retrieved and measured values was very good (R²=0.88) in the aerosol optical thickness, whereas it is good (R²=0.65) in Angstrom exponent. In addition, we found an excellent agreement(R²=0.936) between the retrieved and measured NASA/AERONET data at Male site in Indian Ocean in the optical thickness. Finally, we presented the distribution maps of aerosol parameters over the oceans in Asia during April 16-20, 1997.
THE ANALYSIS OF ADEOS/POLDER DATA
Kawata, Yoshiyuki,Izumiya, Toshiaki,Takano, Yuichi,Yamazaki, Akihiro 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
We have made the cross calibration in terms of space reflectance between POLDER and OCTS sensors on board ADEOS satellite, using the POLDER and OCTS data acquired simultaneously on April 24, 1997. The space reflectance values for the same target computed from the POLDER and OCTS data are in very good agreement, when we adopted the new calibration coefficients of OCTS suggested by the vicarious experiment by NASDA. Then, we estimated aerosol parameters for several target areas (two areas in the Sea of Japan and three in the Pacific Ocean) from ADEOS/POLDER's directional reflectance and polarization data in 760nm and 865nm bands. A single atmospheric layer model with an isotropic Gaussian type ocean surface (Cox-Munk model) was assumed in this study.
FOCAL SURFACES AND EVOLUTES OF CURVES IN HYPERBOLIC SPACE
Hayashi, Ryota,Izumiya, Shyuichi,Sato, Takami Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.1
We define de Sitter focal surfaces and hyperbolic focal surfaces of hyperbolic space curves. As an application of the theory of unfoldings of function germs, we investigate the singularities of these surfaces. For characterizing the singularities of these surfaces, we discover a new hyperbolic invariants and investigate the geometric meanings.