VIIIth International Congress of Photogrammetry: Reprints of papers

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

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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:: 1048997812

Title:: Reprints of papers

Scope:: circa 1120 Seiten in verschiedenen Seitenzählungen

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048997812

Illustration:: Illustrationen

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.

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

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: DEVICE FOR MEASUREMENTS OF PARALLAXES By Gunnar Simonsson

Document type:: Multivolume work

Structure type:: Chapter

E DLKOTE s 1T PPO OGRANMPILIKY, Vol. AZEA i Communication to VIII International Congress for Photogrammetry Reprint from Svensk Lantmateritidskrift Congress Number 1956 Commission 11 DEVICE FOR MEASUREMENTS OF PARALLAXES By Gunnar Simonsson The devices usually used for parallax measurements by means of mirror or pocket stereoscopes in aerial photographs are: Stereometers (or parallax bars) and parallax wedges. The stereometer is a micrometer screw to which are attached two glass plates carrying the measuring marks. By screwing the micrometer the two marks can be set to identical details in the two photographs, the distance between these details — the horizontal parallax — being read on a reading drum. The parallax wedge consists of two non — parallel lines engraved on the bottom of a glass plate. Corresponding parts of the lines are brought to coinside with identical details in the photographs. The horizontal pa- rallaxes can be read on a scale close to one (or both) of the lines. Fundamentally the device here described is a type of parallax wedge, the lines being substituted by rows of dots. The rows, instead of being straight lines, form the systems of points shown by Figure 1. As the two lines of the wedge are not parallel, consequently, the two point sys- tems in Figure 1 have to be unequally shaped. The point row starts with the first point in the U-shaped point group at the top of the system, (See Figure 4), follows the sequences of point groups, and ends with the last point in the point group at the bottom of the system. Each point in the left system corresponds to a point in the right system. A point step represents a parallax difference of 1/10 millimeter. Thus each point group represents a parallax difference of 1 millimeter and, con- sequently, the whole system, consisting of 20 point groups, allows mea- suring parallax differences up to 20 millimeters. s There are two obvious advantages of this arrangement of the points: l. All points required for the parallax measurements are concentrated Within a small area, which means that the plate can be attached to the Stereoscope at the beginning of the work and need not then be remo- ved. (Only small adjustment of vertical parallaxes may be needed.) A EL NS esci TO MA ed C APRI DE C

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