VIIIth International Congress of Photogrammetry: Proceedings of the Congress

Fagerholm, P. O.; Ternryd, C. O.

Bibliographic data

Multivolume work

Persistent identifier:: 1048861678

Title:: VIIIth International Congress of Photogrammetry

Sub title:: Stockholm, Sweden, July 17 - 26, 1956

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048861678

Language:: English

Other Title:: Paralleltitel: VIIIe Congrès International de Photogrammétrie

Editor:: Fagerholm, P. O.

Corporations:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Adapter:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Document type:: Multivolume work

Volume

Persistent identifier:: 1048862747

Title:: Proceedings of the Congress

Sub title:: VIIIe Congrès International de Photogrammétrie

Scope:: 399 Seiten

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048862747

Illustration:: Illustrationen

Signature of the source:: ZS 312(12,1)

Language:: French

Other Title:: Paralleltitel: Compte rendu du Congrès

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

Contributor:: Ternryd, C. O.

Editor:: Fagerholm, P. O.

Corporations:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Adapter:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress 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:: COMMISSION II [compte-rendu]

Document type:: Multivolume work

Structure type:: Chapter

COMMISSION II Président: Professeur Dr. W. K. Bachmann, Suisse Secrétaire: Ingénieur W. Haberlin Procès-verbal de la séance du 18 juillet 1956, à 10.00 heures (a) Le président ouvre la séance et donne un exposé sur l’activité de la Commis sion II depuis le Congrès International de Photogrammétrie à Washington 1952. Il donne aussi les traits principaux du rapport général de la commission et de l’essai no 2 Vercors. The Chairman opened the meeting and gave an account of the activities of Commission II since the Washington Congress. He also mentioned the main features of the General Report of the Commission and of Test No. 2, Vercors. Ensuite la parole est donnée à M. W. C. Cude, Etats-Unis, pour la présentation de sa communication »Experiences with convergent photography». Résumé: The paper discusses investigations with convergent photography using wide angle lenses following the same trend of reasoning which had prompted the convergent photography investigations in Europe prior to the development of the wide angle lens. Inadequate map coverage in the United States requiring expeditious action and economy of personnel and equipment made the use of convergent wide angle photography seem worthwhile, since higher flight alti tudes would be possible and commonly used U. S. equipment would require little modification. The first laboratory tests with multiplex equipment indicated an increase of 1.5 to 2.0 times the contour accuracy of vertical photography taken at the same altitude. No increase in planimetric accuracy was noted. The Kelsh plotter was then given the same type of test with both vertical and convergent photography with approximately the same results, except that the stereomodels of the convergent photography suffered a greater loss in resolution. This was probably due to the greater magnification of the Kelsh plotter and the unusual depth of focus of the multiplex. Special plate holders designed for the purpose did improve the resolution, however the contouring accuracy remained the same. Aerial triangulation requirements involving the bridge from one convergent stereomodel to the next convergent stereomodel led to the development of the Twinplex by the U. S. Geological Survey and the Stereopontometer by the Corps of Engineers to suit their specific problems. Tests were also conducted on the Zeiss Stereoplanigraph C-8 and the Wild Autograph A-7 with promising results. To properly study the magnitude of instrumental errors and for calibration purposes special glass grid plates were made. Tests with these showed possi bilities of even higher contour accuracies. Work continues on block adjustment of a series of convergent flights with variations of control and procedures. IF. C. Cude: Experiences with convergent photography. (Publ. II C 1) 163

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