写真測量とリモートセンシング
Online ISSN : 1883-9061
Print ISSN : 0285-5844
ISSN-L : 0285-5844
36 巻 , 5 号
選択された号の論文の11件中1~11を表示しています
  • 横田 直彦
    1997 年 36 巻 5 号 p. 1
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
  • 藤田 浩司, 千葉 達朗, 小野田 敏
    1997 年 36 巻 5 号 p. 2-3
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
  • 李 〓, 竹内 延夫, 村井 俊治, 松本 好高
    1997 年 36 巻 5 号 p. 4-10
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    幾何学的な不安定性がラインスキャナシステムにとって重要な問題である。スプライン関数を用いて, 航空機の外部標定要素の変動モデルをたてるのは, 航空機搭載ラインスキャナシステムの外部標定要素の相互標定ための一つのモデル作りの方法である。この方法では, スプライン関数の次数及び近似区間長が相互標定結果の精度に影響を与えることが予想できる。この論文は, スプライン関数の次数と近似区間長の確定方法を提案する。この方法ではスプライン関数の連続性が考慮されている。数学モデルを説明し, 一回の飛行実験で得たINSの観測データを使って計算を行い, この方法の有効性を示す。
  • 清水 英範, 表 明榮
    1997 年 36 巻 5 号 p. 11-16
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    距離空間マッピングとは, 地図上のいくつかの地点間に物理距離以外の距離 (例えば, 交通所要時間や認知距離など) が与えられた時に, 地図上のユークリッド距離がこれら所与の距離を可能な限り再現するように, 元の地図を幾何学的に歪めることをいう。すなわち, 地点間の距離を基準とする一種の幾何補正手法である。距離空間マッピングは, もともとは地理学における伝統的な研究分野であったが, GISの技術的発展と普及を背景に, 時間距離や認知距離が構成する空間を地図の歪みによって自動的かつ印象的に視覚化する技術として関心がもたれるようになり, 近年では, 都市計画, 交通計画などの分野においても応用研究が進められている。本論文では, これまでの距離空間マッピング研究において用いられてきた最も代表的な手法であるTorgersonの多次元尺度構成法の理論的問題点を明らかにし, この問題点を解決する手法として三辺測量のFree-network解法の応用がきわめて有望であることを示す。
  • 本多 嘉明, 梶原 康司, 山本 浩万, 岡野 千春, 黄 少博, 松岡 真如
    1997 年 36 巻 5 号 p. 17-23
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    To verify the reliability of the algorithm for speculating physical variable from 1km satellite data, it is necessary to use the ground observational data to calculate physical value in a wide survey unit (1km × 1km) . Since it is difficult to conduct the ground observation within whole wide survey unit in short time, the minimal survey area which can represent a wide survey unit has to be determined. The research is armed to find the minimal representing area of a wide survey unit through the car survey and radio-controlled helicopter survey.
    Flat and homogeneous grassy plain in Mongolia is chosen as survey land. In case of car survey, 100 observational points are measured. VCR (Vegetation Coverage Ratio) values are calculated from spectrum information and used to compute the moving-averages of VCR. With the increasing of point number, the standard variation of moving-averages becomes smaller and smaller. When the variation approximately disappears after N points, the moving-average of VCR is considered as the observational value which can represent the value in wide survey unit. The total area size of N points at this time will be the minimal representing area of the wide survey unit.
    Moreover, the result from the car survey may be obtained occasionally from ground surface in same situation. To confirm the result, additional observational data are taken from higher sky using radio-controlled helicopter. Each observational point has about minimal representation area. The standard variation of moving-averages in this case is very small. So it can be said that the method used in the research is a good way to calculate the minimal representing area of a wide survey unit.
  • 重松 文治, 守屋 典昭
    1997 年 36 巻 5 号 p. 24-34
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    We have developed an underwater survey system using a scanning Laser sensor and a GPS (Global Positioning System) sensor instrment that is capable of providing high resolution data in low -visibility water. A laser is used as a light source which highly directional pulsed beams with high intensity.
    Topography is surveyed by detecting the propagation time of the pulsed laser beams which are reflected at the bottom of the sea. The laser system is installed in a ship and the beams are introduced to a ROV (Remotely-Operated-Vehicle) through an optical fiber.
    The extremely high propagation velocity of the beam in the water compared with that of an ultrasonic beam and the scanning survey system enable us to measure a large area within a short time.
  • 清水 英範, 表 明榮, 四童子 隆
    1997 年 36 巻 5 号 p. 35-41
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    Principal component analysis (PCA) is a multivariate statistical technique to summarize most of the variation in a observed multivariate system in fewer variables. It has been expected to be an useful technique to visualize the multiband remote sensing data. It is because the RGB color composite image using the summarized three principal components is expected to reflect as much information as possible of the original multivariate remote sensing data. It is known, however, that the actual color composite image employing PCA is not necessarily understandable one because the principal components are not distinctly correspondent to the electromagnetic wavelength, i. e. color, and consequently the relationship between the represented color and land cover becomes vague. This paper proposes a new type of the color composite technique by integrating PCA and the Normal Varimax Rotation (NVR) . The NVR is employed to make more distinct the relationship between each principal component and the electromagnetic wavelength by rotating the three dimensional space constituted by the first to third principal components. Since the NVR gives the orthogonal rotation, the three components after rotation represent the whole information of the original three principal components. This paper also presents the practical comparisons among the color composite images which are constructed by the conventional false color composite, the ordinary PCA, and the proposed NVR integrated PCA technique.
  • 橋本 俊昭
    1997 年 36 巻 5 号 p. 42-51
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    ADEOS/OCTS is an optical sensor with a low resolution and a frequent observation period for mainly observing ocean color and temperature. The highly precise geometric correction is necessary for some applications such as multi-temporal analysis, generation of floud free composite images, etc., where the accuracy of less than one pixel is preferable. But the accuracy by the system correction is not sufficient to those requirements.
    The authors have developed the system for precise geometric correction of NOAA/AVHRR imagery. The system utilizes GCPs and is adaptable for any number of GCPs. The system has been modified for OCTS imagery.
    In this paper, the differencies of OCTS from other sensors like AVHRR are pointed out at first and the modifications for the geometric correction of OCTS imagery are described.
  • 近津 博文, 中野 一也, 村井 俊治
    1997 年 36 巻 5 号 p. 52-58
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    The ski jump is scored by judges based on flight distance, style and performance. Generally, the flight distance has to be measured by many judges (distance measurers and recorder) according the FIS (Federation Internationale de Ski) rule.
    From the view point of real-time automated distance measurement in ski jump and effective utilization of a motorized video theodolite, a simulated ski jump was performed in a room by using a motorized video theodolite and an automated distance measurement method was investigated in this paper.
  • 米澤 千夏, 竹内 章司
    1997 年 36 巻 5 号 p. 59-63
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
    The authors attempted to detect crustal deformation by interferometric ERS-1/SAR data pairs. The Omaezaki-area which is located on the subduction zone was used as the test site. Three interferograms were generated from three sets of data pairs. Fairly good interferograms were obtained in both flat agricultural and urban districts; however, they were noisy in forest site due to large decorrelation. The changing patterns of phase difference in these interferograms indicated reasonable correspondence with tendency of subsidence of Omaezaki. Relative values of deformation between three data pairs had significant correspondence. Although, the interferograms may also indicate other factors that affected SAR signals during their transmission. The result of this study suggests the applicability of C-band SAR for detecting crustal deformation in Japanese test sites.
  • 後藤 真太郎
    1997 年 36 巻 5 号 p. 64-65
    発行日: 1997/10/31
    公開日: 2010/03/19
    ジャーナル フリー
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