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Predecessor
Volume 20, Issue 2
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1981 Volume 20 Issue 2 Pages 1
Published: April 25, 1981
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (1589K) -
1981 Volume 20 Issue 2 Pages 2-3
Published: April 25, 1981
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (3259K) -
—Practical Application of Forest—Katsumi Nagamine, Hitoshi Murakami1981 Volume 20 Issue 2 Pages 4-13
Published: April 25, 1981
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSTo improve techniques in remote sensing data analyses, the authors composed a program by introducing the idea of bidirectional reflectance model developed by D.D. Egbert. By applying the program to the forest, the effectiveness of the bidirectional reflectance ratio simulation model was confirmed. The simulation experiment was done step by step: first laboratory experiments, then field experiments and finally experiments using aerophoto data.
As a result, the authors found the forest reflectance characteristic was simulated by the spherical perturbation model. And in the experiment using aerophoto data, the bidirectional reflectance ratio could be estimated by the reformed model plus topographical data and surface structure data of forest.View full abstractDownload PDF (7031K) -
K. Fukue, H. Shimoda, T. Sakata1981 Volume 20 Issue 2 Pages 14-22
Published: April 25, 1981
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSA new pattern clasification algorithm named a table look-up maximum likelihood method was developed. It can achieve nearest processing speed as a conventional table look-up method in spite of the identical clasification accuracy with a maximum likelihood method. Hyperellipsoids defined by the same Mahalanobis' distance associated with each categories overlap each other in multidimensional feature space. Look-up tables in the new algorithm can be considered as orthogonal projections of these set of hyperellipsoids to each feature axes. As compared with a conventional table look-up algorithm, this algorithm is more simple, and in addition can remarkably reduce core memory requirements to store the table.
Using this new algorithm, a LANDSAT MSS image and a high-altitude color infrared aerial photograph were clasified to examine processing times. The results indicated that these rocessing rates compared with the maximum likelihood method are four and seven times faster respectively.View full abstractDownload PDF (2476K) -
K. KIMATA1981 Volume 20 Issue 2 Pages 23-30
Published: April 25, 1981
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSIn contour map plotting of cultural properties, such as artistic crafts and reliefs of Budda, an operator sometimes draws false contour lines at regular interval as if there exsist a nomal slope, although the proper stereoscopical view can not be obtained in fact.
In Nara National Cultural Properties Research Institute, we call this phenomenon “Ito Effect” after it's finder.
“Ito Effect” occurs where the plotting is essentially impossible, but every operator draws false contour lines unconsciously. This operator's action may be caused by mental process that is called psychologically the shape constancy or shape complement.
As “Ito Effect” is affected by the camera position, tones and contrasts of pictures and so on, we can check this phenomenon by taking photograpies with careful consideration for these conditions.View full abstractDownload PDF (13480K) -
[in Japanese]1981 Volume 20 Issue 2 Pages 33-50
Published: April 25, 1981
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (1635K)
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