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Volume 40 (2001)
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Volume 40, Issue 4
Displaying 1-8 of 8 articles from this issue
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[in Japanese]2001 Volume 40 Issue 4 Pages 1
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (1931K) -
[in Japanese]2001 Volume 40 Issue 4 Pages 2-3
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (3809K) -
Takaki OKATANI, Mamoru KOARAI, Kouichi MOTEKI, Nobuyuki WATANABE, Yoko ...2001 Volume 40 Issue 4 Pages 4-13
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSGSI has observed around Ito-City and Mt. Tsukuba using air-borne synthetic aperture radar (SAR) . It is found that accurate digital elevation models (DEMs) can be made, and we can produce a DEM with high data acquisition ratio even in steep topography by combining observations from several directions. As a result, DEMs with less than 10m accuracy in standard deviation were obtained from the both area and 94% of all the grids on the DEM around Mt. Tsukuba were collected through the combination. Further practices, such as, generating ortho images and 3-D images using visualized SAR data and the DEMs were also examined.View full abstractDownload PDF (12692K) -
Yongfen WEI, Tsuyoshi AKIYAMA2001 Volume 40 Issue 4 Pages 14-26
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSMulti-temporal Landsat TM data were utilized to classify the cultivated land located in the middle area of the Nagara River basin, Gifu prefecture. Color images of the vegetation indices including DVI, NDVI, SAVI and GVI were composed from respective multi-temporal VI images obtained from original Landsat TM data. The newly composed images clearly demonstrated the cultivated land such as paddy field, upland field and orchard. The distribution of the cultivated land related to the total river basin was also easily discriminated. However, by comparing the change profiles of the vegetation indices, SAVI was confirmed to be the most suitable index to reflect the vegetative conditions of major land-cover categories at different times, and the composed color image based on this index was thus applied for further classification analysis. As compared to the original TM images, classification results based on the composed SAVI image agreed much well with the related census data, with the classification accuracy for the paddy field and the upland field being especially high. The corresponding classification errors for these two land-cover categories were generally below 10%.View full abstractDownload PDF (3700K) -
Hisashi AOKI, Masashi MATSUOKA, Fumio YAMAZAKI2001 Volume 40 Issue 4 Pages 27-36
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSWe studied the possible use of aerial high definition television (HDTV) images taken after the 1995 Kobe earthquake, to establish a methodology for an automated detection of building damage. The relationship between the degree of building damage and the color and edge indices from the aerial images were examined by image processing techniques. The characteristics of building damage were defined on the basis of hue, saturation, brightness and edge intensity. Using a threshold value of these parameters, the study areas were classified into damaged and undamaged pixels. A filter analysis was further conducted to these pixels and damaged buildings were identified. The estimated damage distribution by the proposed methodology agrees well with the field survey data and the visual inspection of the aerial HDTV and photographs.View full abstractDownload PDF (11325K) -
Bokuro URABE, Mayumi NOGUCHI, Mamoru KOARAI2001 Volume 40 Issue 4 Pages 37-44
Published: September 04, 2001
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSAerial triangulation, in which the transformation parameters of central projection are solved from observed photograph coordinates of orientation points and ground control points using the least square method, has become a popular technology in the field of topographical survey by the help of computers. On the other hand, the process of field survey to establish photo signals (control point survey) has been remained as a laborious work (Ackermann, 1990) . Recently, the technology to utilize the coordinates of the aerial camera at each shot given by kinematic GPS observation into aerial triangulation has been developed, and thus the number of required photo signals can be dramatically reduced. In this paper, the authors compared two methods of GPS-assisted aerial triangulation with conventional methods. Namely, early established Shift Drift method and a newly developed Combined Phase Ambiguity Solution (CPAS) method are compared with Bundle and Independent Model adjustment methods. Also, a trial case to implement a block adjustment without any ground control points using CPAS method will be discussed.View full abstractDownload PDF (873K) -
[in Japanese], [in Japanese], [in Japanese]2001 Volume 40 Issue 4 Pages 45-47
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (3011K) -
[in Japanese]2001 Volume 40 Issue 4 Pages 48
Published: September 04, 2001
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (85K)
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