Showing papers on "Photogrammetry published in 1981"
Book•
09 Oct 1981
TL;DR: Covers aerial photo interpretation and photo-related topics such as photogrammetry, nonphotographic image interpretation, image formation on black and white and color films, sampling, and the energy flow profile.
Abstract: Covers aerial photo interpretation and photo-related topics such as photogrammetry, nonphotographic image interpretation, image formation on black and white and color films, sampling, and the energy flow profile. Deals with the study, interpretation and collection of all kinds of data over large or small geographic regions at many different degrees of intensity.
94 citations
TL;DR: The development, testing, and application of a simple method of photogrammetry are outlined, the first leading to the production of a frontal facial photograph with superimposed contour lines at 2 mm.
16 citations
Patent•
24 Feb 1981
TL;DR: An apparatus for automatically adjusting the level of at least one surface point on a flexible platen of a photogrammetry apparatus having photogrammetric images projected thereon in first and second colors is described in this paper.
Abstract: An apparatus for automatically adjusting the level of at least one surface point on a flexible platen of a photogrammetry apparatus having photogrammetric images projected thereon in first and second colors is disclosed as comprising means for receiving and transmitting the first and second colored images at the surface point, which is attached to and movable with the receiving and transmitting means and means for vertically positioning the receiving and transmitting means. There is also provided means for converting the transmitted colored images into electrical signals, which are proportional in strength to the intensity of the colored images, and means for controlling the positioning means in response to the electrical signals, whereby the surface point is adjusted to a position where the colored images intersect.
15 citations
01 Jan 1981
11 citations
TL;DR: The problem of measuring singly the volumes and surface areas of macrophages with their complex and variable morphology was dealt with by the photogrammetric analysis of stereoscopic SEM micrographs, finding the reproducibility to be greater than 95%, using the most basic stereophotogrammetrics techniques.
Abstract: SUMMARY
The problem of measuring singly the volumes and surface areas of macrophages with their complex and variable morphology was dealt with by the photogrammetric analysis of stereoscopic SEM micrographs. The reproducibility of these measurements was found to be greater than 95%, using the most basic stereophotogrammetric techniques.
9 citations
TL;DR: In this paper, the use of non-metric cameras in short-range stereophotogrammetry with particular reference to a pair of MAMIYA C330 Professional Cameras is discussed.
8 citations
TL;DR: In this article, the application of close-range photogrammetry for precision engineering projects is discussed, using examples from the shipbuilding and power-generating industries, and stereo photogrammetric was used to determine milling dimensions to an accuracy of 3 mm for large subassemblies of spherical tanks for liquified natural gas, while mono photogrammmetry was applied for the determination of diameters of a penstock feeding turbines.
6 citations
01 Jun 1981
TL;DR: Solutions for matching between photogrammetric models and adjusting information related to the edges of adjacent DTMs are presented in this paper, where three classes of problems are discussed: matching topographic fe...
Abstract: Solutions for matching between photogrammetric models and adjusting information related to the edges of adjacent DTMs are presented. Three classes of problems are discussed: matching topographic fe...
4 citations
TL;DR: In this paper, two ways of determining initial values for bundle adjustment in industrial photogrammetry are first explained, one approach is based on solving the 11 parameters of the linear relation between photo and object space coordinates.
4 citations
TL;DR: The common goal is to enhance the capabilities of the PG-2 plotter and provide a means by which geologists can make conventional geologic maps more efficiently and explore ways to apply computer technology to geologic studies.
TL;DR: The presentation will describe current work at OSU in this area and recommend the use of “area surveys”, instead of the single traverses, together with rigorous adjustment procedures suitable for the network of criss-crossing lines inertially surveyed.
Abstract: Present day inertial surveys are limited to single traverse runs in which the number of unknown system parameters to be determined are few, depending on the number of control points available along the traverse. Further, conventional inertial surveys are generally restricted to the determination of coordinates with no possibility for a rigorous post-mission adjustment of the observations. The consequence is the continued presence of systematic trends in the residuals, even after the use of error models such as those proposed by Ball, Gregerson or Kouba. Future work aiming at higher accuracies obviously requires more comprehensive models and rigorous adjustment procedures. These can be accomplished by the development of such error models and by the use of “area surveys”, instead of the single traverses, together with rigorous adjustment procedures suitable for the network of criss-crossing lines inertially surveyed. In such a network the cross-over points serve as constraints for the geodetic parameters (latitude, longitude, height, gravity anomaly, deflection components) and allow the addition of hardware and software related error parameters. Thus an opportunity is provided to effectively self-calibrate the system—a concept successfully used, for example, in photogrammetry or in satellite tracking. The number and the strength of such parameters depend on the number of control and cross-over points. The adjustment, of course, also provides the necessary statistical information on the adjusted parameters, such as their precision and the correlation between them.
01 Mar 1981
TL;DR: The question of which algorithm is most appropriate for the solution of normal equations with different structures has been investigated and a direct solution for banded and b-shaped solutions is found.
Abstract: The question of which algorithm is most appropriate for the solution of normal equations with different structures has been investigated. The solution methods are a direct solution for banded and b...
01 Nov 1981
TL;DR: It is shown that real time mensuration of 7-parallax can be used as a means to help maintain a desired relative orientation in a variety of digital collection system.
Abstract: : The practicality of converting digital and stereo image data into terrain elevation data in real time is investigated. Results indicated that the real time collection of elevation data using epipolar correlation methods is not feasible. It is shown that real time mensuration of 7-parallax can be used as a means to help maintain a desired relative orientation in a variety of digital collection system. (Author)
Proceedings Article•
01 Jan 1981
TL;DR: The Bureau of Mines has two projects in the remote sensing field as it pertains to mining as mentioned in this paper, one of which is a completed contract that studied the use of aircraft mounted cameras and the results of photogrammetry.
Abstract: The Bureau of Mines has two projects in the remote sensing field as it pertains to mining One of these is a completed contract that studied the use of aircraft mounted cameras and the results of photogrammetry The second project is an ongoing contract to study the effectiveness of using an instrumentation system wired to remote data collection station to record embankment data 6 refs
TL;DR: In this paper, the development of automated photogrammetric instruments has evolved from modification of conventional instruments or computer-controlled plotters to the fully automated instruments of today, characterised by the presence of image correlators.
TL;DR: The geometric accuracy of Landsat Multispectral Scanner images both in photographic and digital form was tested by employing different mathematical models and the Wild-A8 plotter was employed to measure model coordinates and to examine the plotting possibilities.
Abstract: The geometric accuracy of Landsat Multispectral Scanner (MSS) images both in photographic and digital form was tested by employing different mathematical models. An r.m.s. distortion vector of ± 58 m in the photographic images and of ±65 m in the digital images was obtained. Parametric corrections of distortions caused by along-track variation of the satellite's heading angle were carried out. Without using ground control points, it was possible to reduce the r.m.s. errors in the digital images from ±169 m before correction, to ± 83 m after correction. Working with scenes covering the U.K., with adequate overlapping between adjacent orbits, it was possible to investigate the heighting accuracy of that system. Stereoscopic models were formed by analytical add analogue methods. A modified method of relative orientation was developed to form an analytical model, and the Wild-A8 plotter was employed to measure model coordinates and to examine the plotting possibilities. The r.m.s. of y-parallax was ±...
TL;DR: This chapter discusses the various types of measuring instruments, accuracy, and reliability in extracting quantitative data, and the two principal approaches are analogical and analytical.
Abstract: Publisher Summary This chapter discusses the various types of measuring instruments, accuracy, and reliability In extracting quantitative data, the primary requirement of instrumentation is to obtain coordinates with the supplementary requirement of a facility for continuous plotting The two principal approaches are analogical and analytical The former involves double-projection optical-mechanical analog systems in which replicas of objects are created for the acquisition of data In the latter, computer-interfaced comparators are used to derive the required data computationally Each approach has three basic components which include the viewing system, the measuring system, including the orientation mechanisms, and the readout and recording system An analytical plotter consists of a precision stereocomparator and coordinatograph interfaced with an electronic digital computer plus other auxiliary devices as may be necessary These plotters are capable of solving a wide variety of photogrammetric problems A digital terrain model is a numerical description of the surface of an object in terms of the X, Y, and Z coordinates of points on the surface This is usually done with an ordered array of numbers, which can be based on measured and derived coordinates of discrete points on the surface
TL;DR: A curved segmental concrete bridge at Vail Pass, Colorado was the subject of investigation as discussed by the authors, where the geometric properties of the precast segments were determined by analytical photogrammetry and compared to design data to obtain quality control for casting.