DEFORMATION MEASUREMENT BY PHOTOGRAMMETRY

The application of phorogrammetry to the measurement of deformation is discussed and four different approaches are identified and compared. References to and summaries of recent work are made.     

THE APY SYSTEM FOR ANALYTICAL PHOTOGRAMMETRY

The new APY (Analytical Photogrammetry Yzerman) system is described and a detailed explanation is given of the principles involved. The APY depends on a unique modular design. A list of the straightforward operations required for its application in data compilation and revision is included.     

THE USE OF PHOTOGRAMMETRY AND REMOTE SENSING FOR FORESTRY IN GREAT BRITAIN

The Forestry Commission needs information on the woodland cover of the country, both as general assessment of all ownerships for woodland census purposes and as detailed crop data on its own forest estate for management purposes. These survey requirements are outlined and the methods used for data collection are described, particular attention being given to the role of aerial survey. The development of a digital mapping system is also covered. Finally, the potential role of other remote sensing techniques and the trials currently in progress are discussed.     

用线特征摄影测量对目标体素进行量测和重建的可行性研究

本文利用线特征摄影测量方法对ＣＡＤ实体造型中体素进行自动量测与重建、借此建立ＣＡＤ与数字摄影测量的桥梁，文中提出了一种以描述体素几何元素为未知数，直接在像片线特征与物体表面之间进行匹配的线特征摄影测量模型和方法，并对其可行性进行了实验，实验结果表明：线特征摄影测量能达到立体摄影测量相同的，甚至更高的精度，从而可解决无明显目标点工点物体的自动量测。     

THE PHOTOGRAMMETRY OF BUBBLE CHAMBER TRACKS

A brief account is given of the bubble chamber technique as used in elementary particle physics research. A more detailed discussion follows of the procedures used to derive three dimensional information from raw data in two dimensions. The presentation of the paper takes the form of answers to a series of questions.     

THE EVOLUTION OF DIGITALPHOTOGRAMMETRYFROM ANALYTICAL PHOTOGRAMMETRY

The evolution of digital photogrammetry from analytical photogrammetry is outlined, partly by considering the methods employed, but with the main emphasis on mathematical and physical principles. A fundamental distinction is obvious from the nature of the primary information measurement data: the image co-ordinates with analytical photogrammetry and the digital image grey values with digital photogrammetry. For both techniques, appropriate Gauss-Markov evaluation procedures are compared. The relevant relationships between image space data and object space models are presented; radiometric considerations play a more important role than before. The evaluation of digital image grey value data is no longer based on digital image correlation. Instead, a new principle of image inversion has been introduced by directly back-projecting grey values of an image on to object space models. The numerical procedures of digital photogrammetry need some stabilisation by appropriate regularisation elements. The new concept of digital photogrammetry may be applied to imagery from almost any sensor.     

MEASUREMENT OF SURFACE ROUGHNESS IN DESERT TERRAIN BY CLOSE RANGE PHOTOGRAMMETRY

As part of the measurements of desert terrain characteristics in the United Arab Emirates, made in support of a study of airborne radar, close range vertical stereophotographs of various natural surfaces were taken with a pair of Hasselblad MK70 metric cameras. The technique is described and the constraints imposed by the ground conditions and the need for rapid measurements are explained. Various terrain types are illustrated and the method is described whereby variables summarising surface roughness and surface slope were generated from profiles of the microrelief. From a more general discussion of current equipment and geomorphological applications of close range photogrammetry, it is concluded that this flexible technique is presently under utilised by field scientists.