By Charles A. Whitten, Kenneth H. Drummond
About The Product
Published via the yank Geophysical Union as a part of the Geophysical Monograph Series.
The winning launchings of high-altitude rockets and synthetic Earth satellites have opened a brand new period within the number of geophysical information. the applying of those new recommendations would require the mixed principles, reviews, and prone of scientists in a wide selection of disciplines. to illustrate, any efforts within the selection of geodetic information will unavoidably draw jointly a number of fields of undertaking open air of geodesy, similar to astronomy, rocketry, and electronics, to call a number of.
In acceptance of this, many American geodesists expected the necessity of a convention on modern Geodesy for the interchange of data and concepts between scientists in definite fields regarding the recent area age. the aim of the sort of convention used to be now not simply to orient different scientists in glossy geodesy, yet simply as importantly to enlighten the geodesist in these sciences required in house software to his challenge.
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Additional info for Contemporary Geodesy: Proceedings of a Conference Held at the Harvard College Observatory - Smithsonian Astrophysical Observatory, Cambridge, Massachusetts, December 1-2, 1958
I was speaking in favor of traverse. A traverse consists of a single chain of lines. Trilateration consists of at least quadrilateration. I am not so opposed to trilateration that I would refuse to use it where it appears to be the best method. I recognize there could be a good Tellurometer line which could not be observed optically. If it is a problem that can be done cheaper by using a steel tape I would say to do it that way. If it is cheaper by traverse, do it so. There have been cases where we could not measure angles at all but could measure distances electronically.
I think we would want to get the help of the gravity people and by working in terms of equipotential surfaces and by using spirit leveling get a better value for the actual point at which we make our observation. By thinking in terms of the techniques that the photogrammetrists have given us, that is, direction cosines, and if the gravity experts can tell us where the center must be, there may be some further application for computing space coordinates With the techniques Hotine has pro= posed and with the ideas presented by others working in the same general field I believe there is some possible application of computing in space.
Unfortunately, the true shape datum. Then, if astronomic positions are ob- and size of the geoid is seldom known when a served at other points in the network and these datum is established and it is necessary to aspositions compared with the geodetic values, the sume that mean sea level is on the surface of the differences represent deflections of the vertical. spheroid. If we assume an average geoid height This datum is called provisional because it is of 50 meters for a baseline, the length reduced based on one astronomic position.
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