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:: GENERAL REPORT OF COMMISSION II

Document type:: Multivolume work

Structure type:: Chapter

; purely geomet- f orientation of arallax méasure- n practice. The ely orientation" an abundant list leveloped by M. ill be presented (365) APPENDIX TO THE REPORT OF COMMISSION II Project for Standard Tests of Plotting Machines by Mr. Pennington, of the Engineer Research and Development Laboratories, Ft. Belvoir, U.S.A. This project has been annexed to the Questionnaire of Commission Il addressed to all the National Societies of Photogrammetry; they were requested to make known their opinion on the question. The responses were rather few; only the reports of the USA and Italy answered the question. The American report gave only the comments of the Coast and Geodetic Survey, “This method is well suited to determine the theoretical precision of plotting; but it is necessary to insist on the word “theoretical”. The Coast and Geodetic Survey believes that two tests of precision are needed, a theoretical test and a practical test based on the practical results obtained in the surveys. The difference between the final precision and the theoretical precision results from other errors; errors in the control, errors in pointing etc. — and all studies should tend to reduce the difference found between the two precisions." The Italian report contained very studious and detailed response to the proposed test in an appendix. It states first that the test does not accomplish the purpose stated in its first paragraph; *To facilitate the appreciation of the quality of the plotting machines and work done by them". In Paragraph II, Method of Testing, the report proposes the following revision, “The trials will be made on a grid sufficiently precise to eliminate the sources of errors not resulting from the machines themselves”. The following paragraph does not give the plan for reproduction of the grid but says, “The grid shall be composed of straight lines with uniform thick- ness and spacing with the highest obtainable precision and in all cases with a precision of 2 or 2 microns". The 11 points chosen (six from which the stereoscopic image is formed and 5 supplemental points) seem to be entirely too few to completely examine the deformations of the model and particularly not to permit the examination of the deformations in the corners of the model. This appears particularly im- portant for wide angle lenses because of the appreciable discrepancies which they may produce in the corners of the field (in optical or optical-mechanical projection). Another objection is made to the ratio of base/height equal to ?/s because, in Italian practice, the ratio is mostly about !/». For focal lengths of 200 mm 13 X 18, it is necessary to provide for using a base corresponding to three or four subdivisions. Another objection concerns the difference between the points on the grid and those on the photographs; in the latter case all the points in the image which surround the floating mark interfere with the stereoscopic pointing. The pointing on the grid may cause supplemental errors because of the high contrast between the lines and the blanks of the grid. The report proposes then

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