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Volume 21 (1982)
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- Issue 2 Pages 1-
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Volume 21, Issue 2
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1982 Volume 21 Issue 2 Pages 1
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
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1982 Volume 21 Issue 2 Pages 2-3
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1982 Volume 21 Issue 2 Pages 4-14
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSThis paper describes the methods and experiments about automatical height file production and contour drawing from stereo aerial photographs using off-line image correlation. Densitometric data were obtained with a drum scanning micro densitometer and processed by a general purpose computer.
Followings are the scheme of the experiments and some related remarks:
(1) A pair of digital images of stereo aerial photographs were rectified to the equivalent images which have no y-parallaxes. To reconstruct the images nearest neighbour interpolation was used.
(2) The heights at the grid points in the ground coordinate system were sequentially searched to draw contour lines using cross correlation coefficients as a matching criterion. However, for obtaining successful results, some modifications were necessary:
a) Perspective distorsions due to ground reliefs weaken the correlations. The weighted correlation was proved to be effective to moderate this difficulty.
b) For the sequential searching for conjugate image points, close approximation of height values was needed to specify the appropriate search window. This was possible by use of the mean height of neighbouring two points of the concerned grid point as an approximate value.View full abstractDownload PDF (2816K) -
Yojiro Utsunomiya1982 Volume 21 Issue 2 Pages 15-25
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSFor the remotely sensed input parameters, such parameters as the maximum or minimum surface temperature, diurnal variation of the surface soil temperature, daily maximum soil minus air temperature and thermal inertia were examined in some approaches previously proposed for estimating soil moisture with thermal infrared data.
In this paper the author discussed a new parameter which was the normalized rising rate of surface radiant temperature on the basis of experimental results and the soil moisture estimation models by means of multivariate analyses after clarifying the correlation between the surface radiant temperature and soil moisture from the point of view of the surface energy balance and soil physics.
The results in table 2, 3 showed the best correlation for the samples obtained from the Kanto loamy soil especially in the summer, in comparison with other of the samples or samples of paddy soil, and the correlation result for the soil moisture 5 cm in depth showed better correlation coefficient than that of 10 cm in depth within a same soil.
According to linear regression analyses carried out to relate soil moisture in both depth to surface temperature or its rising rate, the model was best fitted to the samples of the Kanto loamy soil in summer, though the regression coefficients of the models fluctuated in the other seasons.
In consequence, future analyses under certain limiting conditions, such as suitable sites and periods of observations would lead to the feasibility of quantitative estimation of soil moisture with the rising rate of surface radiant temperature.View full abstractDownload PDF (3156K) -
Shunji Murai, Makoto Suzuki1982 Volume 21 Issue 2 Pages 26-31
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSBundle adjustment has been evaluated as the best methodology in aerial triagulation from the theoretical point of view. Research works on bundle adjustment have been done mainly in Europe and America, though research and development on bundle adjustment has not been done but strongly requested in Japan.
Fortunately Murai Laboratory, Institute of Industrial Science, University of Tokyo has succeeded in developing a computer program on bundle adjustment in cooperation with Teikoku Survey Co., Ltd. In this paper the results obtained from the experiments will be presented.
The experiments involve the comparisons of accuracy between conventional polynomials method and bundle adjustment for 23 photographs of three courses.
Comparative study was done between the three cases with respect to number of control points and between without self calibration and with self calibration.
From the results of the study, it was made clear that bundle adjustment always gave the better accuracy even in the case of less number of control points as compared with conventional polynomials.View full abstractDownload PDF (570K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1982 Volume 21 Issue 2 Pages 32-41
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSUsers themselves wish to take aerial photographs by means of easy handling and cheap system from several hundred meters high, for environmental study.
Chartered flight for aerial survey used to be expensive, and also very difficult for acquisition at any time and at any frequency. Unmanned system such as radio control aircraft or helicopter needs not only professional skills in operation but also has limitations in confirming the coverage or the looking angle.
The objectives of the study are to develop a kite balloon camera system with 35 millimeter camera of gyro control, which allows to obtain stereo photographs from up to 800 meters, and to establish the methodology for three dimensional measurement and remote sensing.
As the results of the experimental study in Futtsu, Chiba, stereo pairs of aerial photographs with off nadir angle of ±15 degree were successfully taken from 800 meters high under the condition of strong wind velocity.
Analytical stereo photogrammetry can be applied for three dimensional photogrammetry by non-metric camera when the camera is calibrated in advance. The result of the experiment showed that the accuracy of three dimensional measurement was ±8 centimeters in position, ±30 centimeters in height (0.33 permil of flight height) in the case of 800 meters flight height and the focal length of 28 millimeters.
Required volume of helium gas was 7 cubic meters, which costed 18, 900 Japanese Yen. The cost of the kite balloon camera system was 629, 000 Yen in total. A wagon type car to carry 1.37 meters length helium vessel and three operators at minimum are required for this system.View full abstractDownload PDF (8970K) -
[in Japanese]1982 Volume 21 Issue 2 Pages 42-47
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (573K) -
[in Japanese]1982 Volume 21 Issue 2 Pages 48-60
Published: June 30, 1982
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (646K)
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