The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform

Hiroaki Kuze - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous observation of temporal and spatial distribution of atmospheric aerosol by means of slant path and Plan Position Indicator lidars
    Lidar Remote Sensing for Environmental Monitoring XVI, 2018
    Co-Authors: Jamrud Aminuddin, Naohiro Manago, Nofel Lagrosas, Shinichiro Okude, Hiroaki Kuze
    Abstract:

    The influence of aerosols to the atmosphere has been discussed in the context of the Earth radiation budget and global climate change. Therefore, precise monitoring of aerosol parameters is important for better understanding of their real characteristics and impacts on the environment. In this study, we report on a novel method of concurrent measurements of aerosol near the surface level by means of slant-path (SP) and Plan Position Indicator (PPI) lidars. The SP lidar utilizes a diode-laser-pumped Nd:YAG laser operating at 532 nm, while the PPI is based on a Nd:YLF laser at 349 nm. The PPI system including the laser transmitter and telescope section is rotated over 360° for covering all the horizontal directions with the maximum observation range up to around 3 km. At the same time, the SP lidar is employed for monitoring the near surface region that cannot be covered by vertical observation lidars. Furthermore, the backscattered signals recorded by both PPI and SP lidars are analyzed using the Fernald method to retrieve aerosol extinction coefficient by employing lidar ratios for 349 and 532 nm. These values of lidar ratio are estimated by adjusting and fitting parameters in the Mie scattering calculation (mode radius, variance, and both real and imaginary parts of refractive index) to real data from ground-based sampling instruments, namely, the scattering coefficient, absorption coefficient, and size distribution observed with an integrating nephelometer, an aethalometer, and an optical particle counter, respectively. Real-time values of the extinction coefficient inside the atmospheric boundary-layer are derived as the summation of scattering and absorption coefficients. The results are then compared with those from a vertical lidar, operated by the National Institute of Environmental Studies (NIES) on the campus of Chiba University. We discuss the observed features of aerosol characteristics that vary both temporally and spatially.

  • landsat 8 satellite and Plan Position Indicator lidar observations for retrieving aerosol optical properties in the lower troposphere
    ARS, 2018
    Co-Authors: Jamrud Aminuddin, Naohiro Manago, Babag Purbantoro, Nofel Lagrosas, Hiroaki Kuze
    Abstract:

    Observation of optical properties of atmospheric aerosols, especially their behavior near the surface level, is indispensable for better understanding of atmospheric environmental conditions. Concurrent observations of ground-based instruments and satellite-borne sensors are useful for attaining improved accuracy in the observation of relatively wide area. In the present paper, aerosol parameters in the lower troposphere are monitored using a Plan Position Indicator (PPI) lidar, ground-sampling instruments (a nephelometer, an aethalometer, and optical particle counters), as well as a sunphotometer. The purpose of these observations is to retrieve the aerosol extinction coefficient (AEC) and aerosol optical thickness (AOT) simultaneously at the overpass time of Landsat-8 satellite. The PPI lidar, operated at 349 nm, provides nearly horizontal distribution of AEC in the lower part of the atmospheric boundary layer. For solving the lidar equation, the boundary condition and lidar ratio are determined from the data of ground sampling instruments. The value of AOT, on the other hand, is derived from sunphotometer, and used to analyze the visible band imagery of Landsat-8 satellite. The radiative transfer calculation is conducted using the MODTRAN code with the original aerosol type that has been determined from the ground sampling data coupled with the Mie scattering calculation. Reasonable agreement is found between the spatial distribution of AEC from the PPI lidar and that of AOT from the blue band (band 2) of Landsat-8. The influence of AOT on the values of apparent surface reflectance is also discussed.

  • IGARSS - Multi-wavelength lidar system for the characterization of tropospheric aerosols and clouds
    2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
    Co-Authors: Yusaku Mabuchi, Gerry Bagtasa, Masanori Yabuki, Tatsuo Shiina, Naohiro Manago, Nobuo Takeuchi, Hayato Saitoh, Hiroaki Kuze
    Abstract:

    Atmospheric Data Collection Lidar (ADCL) of the Center for Environmental Remote Sensing (CEReS), Chiba University, is a multi-wavelength lidar system designed for measuring tropospheric aerosols and clouds with ancillary data from ground-based aerosol measurement instruments. In this paper, we report on the concept of aerosol and cloud retrieval based on vertical, slant-path, and Plan-Position Indicator (PPI) lidar measurements in combination with aerosol measurements conducted with a three-wavelength integrating nephelometer, an aethalometer, and a particle counter. It is expected that such a combined approach makes it possible to study the detailed features of aerosols in the troposphere, including the aerosol-cloud interaction.

  • Multi-wavelength lidar system for the characterization of tropospheric aerosols and clouds
    International Geoscience and Remote Sensing Symposium (IGARSS), 2012
    Co-Authors: Yusaku Mabuchi, Gerry Bagtasa, Masanori Yabuki, Tatsuo Shiina, Naohiro Manago, Nobuo Takeuchi, Hiroshi Saitoh, Hiroaki Kuze
    Abstract:

    Atmospheric Data Collection Lidar (ADCL) of the Center for Environmental Remote Sensing (CEReS), Chiba University, is a multi-wavelength lidar system designed for measuring tropospheric aerosols and clouds with ancillary data from ground-based aerosol measurement instruments. In this paper, we report on the concept of aerosol and cloud retrieval based on vertical, slant-path, and Plan-Position Indicator (PPI) lidar measurements in combination with aerosol measurements conducted with a three-wavelength integrating nephelometer, an aethalometer, and a particle counter. It is expected that such a combined approach makes it possible to study the detailed features of aerosols in the troposphere, including the aerosol-cloud interaction.

Zheng Jian - One of the best experts on this subject based on the ideXlab platform.

  • The Simulation Method of Radar PPI Display based on OpenGL
    Fire Control and Command Control, 2020
    Co-Authors: Zheng Jian
    Abstract:

    Radar display terminal is used to intuitionally display the radar information,which is an important component of different kind of radar system,at the same time,the vivid simulation of radar PPI display is a difficulty in the simulation of radar system.To solve the problem better,the radar display and OpenGL are first briefly described in the paper,and then a new simulation model and method of radar PPI(Plan Position Indicator)display with brightness based on VC++ and OpenGL are presented.The method is simple and easy to be grasped,the module can easily be reused,expanded and transPlanted.The comparison between the simulation results and the results of real radar display and the actual applications show that it is fit for project needs and has the certainly practical value.

  • Simulation of Radar Plan Position Indicator Display Based on VC++ and Direct3D
    Computer Engineering, 2020
    Co-Authors: Zheng Jian
    Abstract:

    Radar display terminal is used to display the radar information, and is an important component of different kind of radar system. The radar display and Direct3D are described, and on basis of which, a new simulation model and the implementation method of radar Plan Position Indicator(PPI) display with brightness based on VC++ and Direct3D are presented. This method is simple and easy to be grasped, and the module can easily be reused, expanded and transPlanted. Experimental results show both the model and the method proposed are fit for project needs and have the certainly practical value.

  • simulation of radar Plan Position Indicator display based on vc and direct3d
    Computer Engineering, 2009
    Co-Authors: Zheng Jian
    Abstract:

    Radar display terminal is used to display the radar information, and is an important component of different kind of radar system. The radar display and Direct3D are described, and on basis of which, a new simulation model and the implementation method of radar Plan Position Indicator(PPI) display with brightness based on VC++ and Direct3D are presented. This method is simple and easy to be grasped, and the module can easily be reused, expanded and transPlanted. Experimental results show both the model and the method proposed are fit for project needs and have the certainly practical value.

Vittorio Vigorita - One of the best experts on this subject based on the ideXlab platform.

  • Quantifying Bird Migration by a High-Resolution Weather Radar
    IEEE Transactions on Geoscience and Remote Sensing, 2008
    Co-Authors: Roberto Nebuloni, Carlo Capsoni, Vittorio Vigorita
    Abstract:

    We propose a bird detection and count algorithm designed to work with radar maps of Plan-Position-Indicator type. The spatial arrangement of birds is modeled according to the Poisson distribution. It is possible to handle a nonuniform target distribution both on the vertical and horizontal Planes. The method is applied to measurements carried out by an S-band Doppler weather radar located on the south side of the Alps. Quantitative estimates are given for the distribution of bird volume density with height, the cumulative density (integrated over height), and, finally, the daily migration traffic rate of nocturnal migrants over an area of about 2000 km2.

Naohiro Manago - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous observation of temporal and spatial distribution of atmospheric aerosol by means of slant path and Plan Position Indicator lidars
    Lidar Remote Sensing for Environmental Monitoring XVI, 2018
    Co-Authors: Jamrud Aminuddin, Naohiro Manago, Nofel Lagrosas, Shinichiro Okude, Hiroaki Kuze
    Abstract:

    The influence of aerosols to the atmosphere has been discussed in the context of the Earth radiation budget and global climate change. Therefore, precise monitoring of aerosol parameters is important for better understanding of their real characteristics and impacts on the environment. In this study, we report on a novel method of concurrent measurements of aerosol near the surface level by means of slant-path (SP) and Plan Position Indicator (PPI) lidars. The SP lidar utilizes a diode-laser-pumped Nd:YAG laser operating at 532 nm, while the PPI is based on a Nd:YLF laser at 349 nm. The PPI system including the laser transmitter and telescope section is rotated over 360° for covering all the horizontal directions with the maximum observation range up to around 3 km. At the same time, the SP lidar is employed for monitoring the near surface region that cannot be covered by vertical observation lidars. Furthermore, the backscattered signals recorded by both PPI and SP lidars are analyzed using the Fernald method to retrieve aerosol extinction coefficient by employing lidar ratios for 349 and 532 nm. These values of lidar ratio are estimated by adjusting and fitting parameters in the Mie scattering calculation (mode radius, variance, and both real and imaginary parts of refractive index) to real data from ground-based sampling instruments, namely, the scattering coefficient, absorption coefficient, and size distribution observed with an integrating nephelometer, an aethalometer, and an optical particle counter, respectively. Real-time values of the extinction coefficient inside the atmospheric boundary-layer are derived as the summation of scattering and absorption coefficients. The results are then compared with those from a vertical lidar, operated by the National Institute of Environmental Studies (NIES) on the campus of Chiba University. We discuss the observed features of aerosol characteristics that vary both temporally and spatially.

  • landsat 8 satellite and Plan Position Indicator lidar observations for retrieving aerosol optical properties in the lower troposphere
    ARS, 2018
    Co-Authors: Jamrud Aminuddin, Naohiro Manago, Babag Purbantoro, Nofel Lagrosas, Hiroaki Kuze
    Abstract:

    Observation of optical properties of atmospheric aerosols, especially their behavior near the surface level, is indispensable for better understanding of atmospheric environmental conditions. Concurrent observations of ground-based instruments and satellite-borne sensors are useful for attaining improved accuracy in the observation of relatively wide area. In the present paper, aerosol parameters in the lower troposphere are monitored using a Plan Position Indicator (PPI) lidar, ground-sampling instruments (a nephelometer, an aethalometer, and optical particle counters), as well as a sunphotometer. The purpose of these observations is to retrieve the aerosol extinction coefficient (AEC) and aerosol optical thickness (AOT) simultaneously at the overpass time of Landsat-8 satellite. The PPI lidar, operated at 349 nm, provides nearly horizontal distribution of AEC in the lower part of the atmospheric boundary layer. For solving the lidar equation, the boundary condition and lidar ratio are determined from the data of ground sampling instruments. The value of AOT, on the other hand, is derived from sunphotometer, and used to analyze the visible band imagery of Landsat-8 satellite. The radiative transfer calculation is conducted using the MODTRAN code with the original aerosol type that has been determined from the ground sampling data coupled with the Mie scattering calculation. Reasonable agreement is found between the spatial distribution of AEC from the PPI lidar and that of AOT from the blue band (band 2) of Landsat-8. The influence of AOT on the values of apparent surface reflectance is also discussed.

  • IGARSS - Multi-wavelength lidar system for the characterization of tropospheric aerosols and clouds
    2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
    Co-Authors: Yusaku Mabuchi, Gerry Bagtasa, Masanori Yabuki, Tatsuo Shiina, Naohiro Manago, Nobuo Takeuchi, Hayato Saitoh, Hiroaki Kuze
    Abstract:

    Atmospheric Data Collection Lidar (ADCL) of the Center for Environmental Remote Sensing (CEReS), Chiba University, is a multi-wavelength lidar system designed for measuring tropospheric aerosols and clouds with ancillary data from ground-based aerosol measurement instruments. In this paper, we report on the concept of aerosol and cloud retrieval based on vertical, slant-path, and Plan-Position Indicator (PPI) lidar measurements in combination with aerosol measurements conducted with a three-wavelength integrating nephelometer, an aethalometer, and a particle counter. It is expected that such a combined approach makes it possible to study the detailed features of aerosols in the troposphere, including the aerosol-cloud interaction.

  • Multi-wavelength lidar system for the characterization of tropospheric aerosols and clouds
    International Geoscience and Remote Sensing Symposium (IGARSS), 2012
    Co-Authors: Yusaku Mabuchi, Gerry Bagtasa, Masanori Yabuki, Tatsuo Shiina, Naohiro Manago, Nobuo Takeuchi, Hiroshi Saitoh, Hiroaki Kuze
    Abstract:

    Atmospheric Data Collection Lidar (ADCL) of the Center for Environmental Remote Sensing (CEReS), Chiba University, is a multi-wavelength lidar system designed for measuring tropospheric aerosols and clouds with ancillary data from ground-based aerosol measurement instruments. In this paper, we report on the concept of aerosol and cloud retrieval based on vertical, slant-path, and Plan-Position Indicator (PPI) lidar measurements in combination with aerosol measurements conducted with a three-wavelength integrating nephelometer, an aethalometer, and a particle counter. It is expected that such a combined approach makes it possible to study the detailed features of aerosols in the troposphere, including the aerosol-cloud interaction.

Jan Szturc - One of the best experts on this subject based on the ideXlab platform.

  • Quality-based generation of weather radar Cartesian products
    Atmospheric Measurement Techniques, 2014
    Co-Authors: Katarzyna Ośródka, Jan Szturc
    Abstract:

    Abstract. Weather radar data volumes are commonly processed to obtain various 2-D Cartesian products based on the transfer from polar to Cartesian representations through a certain interpolation method. In this research an algorithm of the spatial interpolation of polar reflectivity data employing quality index data is applied to find the Cartesian reflectivity as Plan Position Indicator products. On this basis, quality-based versions of standard algorithms for the generation of the following products have been developed: ETOP (echo top), MAX (maximum of reflectivity), and VIL (vertically integrated liquid water). Moreover, as an example of a higher-level product, a CONVECTION (detection of convection) has been defined as a specific combination of the above-listed standard products. A corresponding quality field is determined for each generated product, taking into account the quality of the pixels from which a given product was determined and how large a fraction of the investigated heights was scanned. Examples of such quality-based products are presented in the paper.

  • Quality-based generation of weather radar Cartesian products
    Atmospheric Measurement Techniques Discussions, 2014
    Co-Authors: Katarzyna Ośródka, Jan Szturc
    Abstract:

    Abstract. Weather radar data volumes are commonly processed to obtain various 2-D Cartesian products based on the transfer from polar to Cartesian representations through a certain interpolation method. In this research, an algorithm of the spatial interpolation of polar reflectivity data with respect to QI (quality index) data is applied to find the Cartesian reflectivity as PPI (Plan Position Indicator) product and generate a corresponding QI field. On this basis, quality-based versions of standard algorithms for the generation of the following products have been developed: ETOP (echo top), MAX (maximum of reflectivity), and VIL (vertically integrated liquid water). Moreover, as an example of a higher-level product, a CONVECTION (detection of convection) has been defined as a specific combination of the above-listed standard products. A corresponding QI field is determined for each generated product, taking into account the quality of the pixels from which a given product was determined and how large a fraction of the investigated heights was scanned. Examples of such quality-based products are presented in the paper.