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

Bibliographic data

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:: GENERAL REPORT OF COMMISSION II

Document type:: Multivolume work

Structure type:: Chapter

(366) to adopt a method of testing with grids by means of monocular observations which would permit appreciable lowering of the personal equation, and grids with an interval of 5 mm. In reference to the measurements, the Italian report thinks it preferable to compare the mean value of six observations made on each point with the cal- culated theoretical values. The general characteristics of the stereoscopic image would be better shown by the average of all the absolute values of the discrep- ancies. In Paragraph 5, determination of the mean square errors, one foresees that for the apparatus using the Porro-Koppe principle allowance would be made for the distortion of the lenses used in plotting and others, could be made without correction for distortion. The trials would have to be made with allowance for the distortions of each of the lenses of the air cameras (multiple cameras). Moreover, the last paragraph is not satisfactory because it does not consider the scale of the original photographs. The report furnishes different calculation of the theoretical precision of different plotting machines; the theo- f retical error of the instruments to the scale of the photography is e — s X — zZ s being read at the scale of the plotting, f the focal distance, z the height of flight to the scale of the photographs. The report next describes the method of testing used at the IGM and the Officine Galileo. It does not differ essentially from the proposed method but we will not discuss the details. The IGN of France believes that this testing proposal applies only to a very small part of the numerous operations which compose an aerial survey. Such a survey includes all of a series of operations which should be made by coherent means with corresponding precision for each step (photography, con- trol, plotting) considering the specified objectives: a map at a given scale satis- fying high standards of precision. The standard test of the proposed procedure is only a test of the mechan- ical and optical assembly and adjustment of plotting machines which might be obtained in other ways; for example in the Poivilliers B by reading of divided circles; for machines not having divided circles, it is possible to use adjustment methods which refer to the fixed points of a simple grid, without reference to the dimensions of a sub-divided one. Finally, if the method of inspection proposed is practically applicable to machines using a mechanical correction (Stereotopographe Poivilliers D or Stereocartographes Santoni) or optical correction of the distortion (Wild Auto- graphes A5 and A6) when these suffice to cancel the diapositive errors; it is not so practical for machines using the Porro-Koppe principle. The phrase of the last paragraph which says *the theoretical determination (calculated values?) of the coordinates takes account of the distortion of the lens it is proposed to compensate for," appears quite soothing. However, it will be long and difficult to transcribe to linear corrections in the plane of the grid, the corrections to be made to the calculated coordinates to eliminate the influ- ences of the distortion and this with a precision such that the errors thus intro- duced will remain neglible in relation to the errors to be measured. A discrepancy in the distortion of 0.5 Centigrade (16 seconds) in a point of the photograph superimposed on a cross of the grid produced in reference to the theoretical position will be calculated as an error of the order of nir ref gre

Access restriction

Copyright

fullscreen: Actes du 7ième Congrès International de Photogrammétrie (Deuxième fascicule)

Multivolume work

Volume

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation