VIIIth International Congress of Photogrammetry: Reprints of papers

Fagerholm, P. O.; Lycken, L. E.; Thunberg, A.; Öhlin, K. A.

Bibliographic data

Multivolume work

Persistent identifier:: 1048861678

Title:: VIIIth International Congress of Photogrammetry

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

Type of content:: Konferenzschrift

Info on language/writing:: Beiträge teilweise deutsch

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048861678

Reihe:: International archives of photogrammetry (12)

Language:: English

Other Title:: Paralleltitel: VIIIe Congrès International de Photogrammétrie

Editor:: Fagerholm, P. O.

Editor:: Board of the VIIIth International Congress of Photogrammetry

Author:: International Congress of Photogrammetry, 8.; 1956; Stockholm

Document type:: Multivolume work

Volume

Persistent identifier:: 1048997812

Title:: Reprints of papers

Scope:: circa 1120 Seiten in verschiedenen Seitenzählungen

Type of content:: Konferenzschrift

DOI:: 10.14463/GBV:1048997812

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048997812

Illustration:: Illustrationen

Reihe:: International archives of photogrammetry (12,4a)

Signature of the source:: ZS 312(12,4a)

Language:: French

Other Title:: Paralleltitel: Tirages a part

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

Contributor:: Lycken, L. E.; Thunberg, A.; Öhlin, K. A.

Editor:: Fagerholm, P. O.

Editor:: Board of the VIIIth International Congress of Photogrammetry

Author:: International Congress of Photogrammetry, 8.; 1956; Stockholm

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

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Experiences with Convergent Photography WILLIAM C. CUDE

Document type:: Multivolume work

Structure type:: Chapter

SE COM MCC SA [I / id lai N A Reprinted from PHOTOGRAMMETRIC ENGINEERING April 1956 Experiences with Convergent Photography" WILLIAM C. CUDE, Chief, Topographic Engineering Dept., Engineer Research & Development Laboratories, Fort Belvoir, Va. HE study and application of twin camera convergent aerial photography for T purposes is not new. It has been used by several European coun- tries and would have realized a much more universal application except for the introduction of the wide-angle mapping camera lens. Most photogramme- trists, who would otherwise have resorted to convergent techniques, were at- tracted by the advantages of the wide-angle lens for a solution to their problems and, except for a very few, interest in convergent photography was lost. In the U. S. where a great part of the country is yet to be mapped satisfac- torily at scales of 1:25,000, or even smaller, an ever present pressure exists to find methods of producing topographic maps with the highest possible accuracy, but with maximum speed and economy. Recently, the question occurred to photogrammetrists in the U. S. that if convergent normal-angle photography improved performance and economy of nomal-angle techniques, why shouldn't convergent wide-angle photography improve the performance and economy of wide-angle techniques? Superficial inspection of usage of convergent wide-angle photography was very interesting and promising. The greater base height ratio promised higher vertical accu- races; the coverage of twin convergent camera installation indicated economy of photography, stereomodels, and ground control. There were difficulties anticipated too. Convergent photography in terrain of considerable relief could cause holidays; two cameras are required which of course means more opportunity for failure: contact prints are not usable for mosaic work or control identification—questions arose as to what equipment could be utilized, how could aerial triangulation be effectively accomplished. However, the advantages appeared to outweigh the disadvantages and studies were initiated by the U. S. Geological Survey and the U. S. Army Corps of Engineers to evaluate the full potential of convergent wide-angle mapping photography. It was agreed by both organizations very early in their investigations that a convergence angle of 40 degrees (each camera 20 degrees from the vertical) appeared to be the optimum arangment for wide-angle lenses. It was also determined that the stereo- plotting equipment most commonly used in the U. S., the direct projection, dichromatic anaglyphic instruments, namely the Multiplex, the Kelsh Plotters, and the ER-55 or Balplex plotter were exceptionally well adapted to convergent Photography with a minimum of modification. This fact no doubt played an portant part in the acceptance in the U. S. of the idea of convergent photog- raphy. The first investigations of the application of 20-degree convergent wide- angle photography made at the Engineer Research and Development Labora- a * This paper is a contribution to Commission III of the International Society of Photogram- ry, U.S.A.-1 Appendix to the INT. ARCHIVES OF | PHOTOGRAMMETRY, Vol. XIE4, 1956 TTA I ETT ML SEA ee D RR rés Roa A daa rN

Access restriction

Copyright

fullscreen: Reprints of papers (Part 4a)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation