Actes du 7ième Congrès International de Photogrammétrie: Actes du 7ième Congrès International de Photogrammétrie

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Multivolume work

Persistent identifier:: 1048858235

Title:: Actes du 7ième Congrès International de Photogrammétrie

Sub title:: Washington, septembre 1952

Year of publication:: 1954

Place of publication:: Amsterdam

Publisher of the original:: Argus [u.a.]

Identifier (digital):: 1048858235

Language:: English

Other Title:: Paralleltitel: Proceedings of the 7th International Congress of Photogrammetry

Corporations:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Adapter:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Document type:: Multivolume work

Volume

Persistent identifier:: 104885955X

Title:: Actes du 7ième Congrès International de Photogrammétrie

Sub title:: Proceedings of the 7th International Congress of Photogrammetry

Scope:: circa 800 Seiten in verschiedenen Seitenzählungen

Year of publication:: 1954

Place of publication:: Amsterdam

Publisher of the original:: Argus u.a.

Identifier (digital):: 104885955X

Illustration:: Illustrationen

Signature of the source:: ZS 312(11,2)

Language:: French

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Adapter:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: THE INFLUENCE OF INSTRUMENT-ERROR ON METHODS OF ORIENTATION AND ACCURACY OF PLOTTING by R. Finsterwalder.

Document type:: Multivolume work

Structure type:: Chapter

pe e IN (393) THE INFLUENCE OF INSTRUMENT-ERROR ON METHODS OF ORIENTATION AND ACCURACY OF PLOTTING by R. Finsterwalder. The accuracy of photogrammetry has been increased noticeably during the last twenty years. Thereby it was not enough to reduce one influence of error but the sum of all influences. These influences are for instance the resolving power of the lens and of the photographic emulsion, residual distortion of lens, irregular film shrinkage and all influences of instrumental errors. The sum of all these influences has been expressed hitherto by the value of m, — — 0,05 mm on the original photograph (monocular measuring). Hereby precision plotting instruments are supposed. m, is a fundamental value used widely for general error-investigations. It has been often discussed, some ones were of the opinion it may be smaller f.i. Kasper, but on the other hand Hallert (Sweden !) tested the value to be larger. He found 0,051 mm in 1951. Nevertheless there was no great objection against the value mo = 0,03 mm. An import progress was the increase of optical resolving power and reducing resp. eliminating of lens distortion, but all the progress brought about the Orthometar, Topogon, Metrogon, Aviotar, Aviogon and Topar-lenses would have been in vain unless the photographic resolving power had been simultane- ously refined and the stability of photographic emulsion base improved and also the irregular film shrinkage reduced. An import problem is to-day whether film or glass should be used as emulsion base. The progress which has been attained is evident from the fact: whereas several years ago it was still necessary to use crosses Or circles one meter in diameter for rendering the control points visible it is now sufficient to white- wash only the boundary stones for precise plotting from photographs of low altitude (h = 1000-2000 m). Points of this kind can be located by the floating mark with an accuracy in excess of 0,03 mm (monocular measuring), this special accuracy is now at least 0,01 mm. Of the same order is the value of vertical parallaxes which are just visible in the reciprocal orientation. It is of greatest interest that one sicceeds ‘also in this case in eliminating all visible vertical parallaxes when orientating relatively two photographs in the plotting instru- ments. This experience proves also the high progress attained in the accuracy of these instruments. Instrument errors and methods of orientation. Even in our days the method usually employed for reciprocal orientation is still the optical-mechanical process of O.v. Gruber, any calculation is hereby avoided and results are obtained very quickly. But the optical-mechanical method is a little too primitive, one gets no figures, that is a disadvantage in some cases especially in aerotriangulation where 1) Hallert, B. Contribution to theory of errors for the double point intersection in space. Transact. of the Royal Inst. of Technology 1950, see pp. 62.

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