We surveyed soil erosion and slope failure in a grazed pasture in South Hokkaido using digital surface model (DSM) for geomorphic analysis, also, estimated about adaptation to a monitoring in a grazed pasture using DSM. In this study, DSMs were extracted by multi-temporal aerial photographs and digital photogrammetric technique. Digital elevation model (DEM) was extracted by contour map of paper for accuracy validation of DSM absolute accuracy. As a result of DSM accuracy evaluation on the basis of DEM, in all the ages, root mean square deviation of height direction were with satisfactory accuracy. Using extracted multi-temporal DSMs, large-scale soil erosion and slope failure were able to be performed. In addition, growths of grass were able to be grasped. However, it was difficult to extract the minute geomorphic change formed in the grazed pasture. Application of photogrammetric technique to monitoring of grazed pasture definite showed may be able to contribute to preservation of a grazed pasture, and maintenance.
This paper demonstrates a method for the extraction of building walls with the object-space matching by using independent rectification images of aerial photograph. In order to solve problems of wall extraction, we proposed 2 matching methods and evaluated with the experiments in this paper. Multiple edge matching method extracts roof outlines from complicated images. In addition, wall matching method searches the accurate wall position from candidates of roof outlines. In the experimental results, first, multiple-images edge matching has obtained candidate of roof outlines in sufficient accuracy for initial value of wall matching method. Second, in the case of existing gap between roof outlines and actual wall position, the wall position has been measured automatically in accurate position with wall matching. In general, image matching on building wall using aerial photographs is difficult. However, proposed method can solve this problem by using searching in the object space with the independent rectification images. And then, building wall or not can be judged with characteristic of correlation coefficient in image matching. Finally, this method contributes to measure accurate building wall position.
Recently, laser scanning has been receiving greater attention as a useful tool for real-time 3D data acquisition, and various applications such as city modelling, DTM generation and 3D modelling of cultural heritage sites have been proposed. However, robust filtering systems for distinguishing on- and off-terrain points from 3D point-cloud data collected by scanner still have many issues. On the other hand, the filtering of 3D point-cloud data collected by a terrestrial laser scanner has severe problems caused by large number of occlusions, due to the presence of windows and so on. In oder to resolve these issues, a robust filtering and break-line detection method using surface flatness has been developed by the authors in 2004. However, the method requires efficient CAD-data generation for utilization in the digital documentation. In order to perform CAD-data generation using point cloud data as break-line, an efficient CAD-data generation method to historical wall is described in this paper.
Multi-functional Transport Satellite (MTSAT) is a Japanese geostationary satellite launched in 2005 and provides hourly data with 5 bands including two thermal infrared bands in the 10.5-12.5μm region. Hourly LST data enables us to improve our understanding of surface energy balance. In this research, we have evaluated split-window equations to retrieve hourly Land Surface Temperature (LST) from thermal infrared data of MTSAT. Radiative transfer code was used to simulate brightness temperatures measured at sensor on MTSAT, and the coefficients of split-window equations were derived from the simulation results with a statistical regression method. As a result, though surface emissivity or atmospheric water vapor that are input parameters to estimate LST contain errors, the accuracy of the split-window equation which requires both parameters have been higher than that of the equation which require only surface emissivity. These split-window equations are able to estimate LST with the RMSE less than or equal to 0.7K and 1.09K, respectively, in the case of viewing zenith angle lower than 40 degree and no atmospheric water vapor and surface emissivity errors.
Recently, pixel numbers and functions of consumer grade digital cameras are amazingly increasing by modern semiconductor and digital technology, and there are many low-priced consumer grade digital cameras which have more than 10 mega pixels on the market in Japan. For example, 14.7 Mega consumer grade digital cameras have already appeared on the market in 2008. In these circumstances, convenient digital photogrammetry using consumer grade digital cameras are enormously expected in various application fields. There is a large body of literature and software on the calibration of consumer grade digital cameras. However, there are still problems for efficient digital photogrammetry using consumer grade digital cameras. These problems are performance evaluation of consumer grade digital cameras from the view point of stability, reliability, robustness of housing and physical integrity of the camera, and evaluation of repeated utilization of interior orientation parameters which was obtained beforehand. With this motive, performance evaluations of consumer grade digital cameras are investigated in this paper with respect to stability, reliability, robustness and issue for repeated utilization of interior orientation parameters using 50 consumer grade digital cameras.
A joint research team of Tokai University, Waseda University and NARSS has been carrying out archaeological investigations in Egypt using satellite remote sensing data to establish a new method of detecting remains since the 1990's. As a result of the latest study by the utilization of QuickBird image, a probable large port structure belonging to the valley temple of pyramid complex has been discovered at a highly expected nominate-point named Site No. 49 where has not been investigated for long time in the field of archaeology. The outer shape of the port structure is rectangular, and the size reaches 190m x 500m. This is a preliminary report about the discovery of Site No. 49.
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