Kazuya Takemata

Design of Lifelong Learning Content Using the Mobile E-Time Capsule System

In this study, we develop a system called an “e-time capsule,” where a “time capsule” event for students to put their mementos into a container, bury it in the school yard, and dig it out in a certain time later and open it is achieved on the cloud. The students’ image data of the daily scenes in their classrooms and their products in classes, which are collected using a mobile device, are stored in a server located in the classrooms. The schedule of opening the time capsule is determined based on an agreement by all students of the class at the time when the capsule is buried. In Japan, a time capsule is often opened at the time of coming-of-age ceremonies when the participants attend a coming-of-age ceremony at the age of 20, also as a way of a reunion. In the system which is developed through this study, the opening event is achieved by distributing the data to the smart phones of the students who come to the reunion venue. This paper addresses the data collection and storage using mobile devices of the students.

Development of Game Software Based on Color Universal Design

In this study, we show the game software which can equally be enjoyed by color vision deficiencies (color anomaly). Furthermore our maze exploration game is produced in order to help promote the color perception test.

Surface reflectance ratios for several land classes in Japan between visible and infrared bands from satellite and sky measurement data

The surface reflectance ratios for certain land classes in Japan between the visible and infrared bands were computed using the observed sky radiometer data and several data sets of Terra/MODIS in 2002 and 2003. They were found to be different from those in USA. The values of aerosol optical thickness τa were retrieved from Terra/ASTER and Landsat-7/ETM+ data sets over Japan assuming new surface reflectance ratios. We found a good agreement between the retrieved and observed aerosol optical thickness values at our study site. This study suggested the necessity of further works on local and seasonal variations in surface reflectance ratios.

Estimation of the BRDF of land surfaces from ADEOS/POLDER image data

The authors have analyzed the POLDER data over lands obtained in June 13, 1997. The atmospheric effects are removed from observed reflectance images by using their atmospheric correction scheme. In the atmospheric correction, their needed a realistic atmospheric model. The POLDERs unique sensor has an ability to measure both the directional reflectance and polarization in the visible and near-infrared bands reflected by the Earth-atmosphere system. They estimated aerosol optical parameters from both the reflectance and polarization data at 443 nm for the study area. They converted the POLDER image data into the surface reflectance image data using the atmospheric correction scheme based on retrieval aerosol optical parameters. Then they got estimates of the Roujeans BRDF parameters for land surfaces in Mongolia from their surface reflectance images at 443, 670, and 865 nm.

Analysis of ADEOS/POLDER data over land surfaces

Abstract In this paper, we made multiple scattering simulations by assuming a single atmospheric layer model with ground surface reflection models. This paper shows the estimated results of surface reflectance A using the observed reflectance and polarization data at 443 nm, 670 nm and 865 nm over land surfaces measured by the ADEOS/POLDER. POLDER level-1 products over the Sahara Desert in West Africa taken on November 18, 1996, were investigated. The main results of this study can be summarized as follows: 1) We found that the theoretical model can satisfy both the observed reflectance and the observed linear polarization data against different observed zenith viewing angles. 2) An assumption of Lambertian reflection for “Desert” seems to be valid. We use the Junge model with ν = 3 and refractive index m=1.55−0.005 as typical desert aerosol in this computation.