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:: TEST MEASUREMENTS OF GRIDS L. E. Lycken

Document type:: Multivolume work

Structure type:: Chapter

COMMISSION II L1 Appendix to the INT. ARCHIVES OF PHOTOGRAMMETRY, Vol. XlIE4, 1956 Communication to VIII International Congress for Photogrammetry Reprint from Svensk Lantmateritidskrift Congress Number 1956 Commission 11 TEST MEASUREMENTS OF GRIDS L. E. Lycken The grid method for investigating stereoscopic plotters [1] 1s based on the use of a grid plate of an accuracy exceeding that of the plotter. From simple measurements of the machine coordinates of the grid points, some important systematic deformations of the pencils of rays may easily be computed. It is not necessary that the grid lines form an ideal square net, if only the coordinates of the grid intersections are known with high accuracy. The determination of coordinates can be made by means of a measu- rng machine. There are, however, few accurate machines having a ca- pacity that permits the whole size of a 24 X 24 cm grid for 9 X 9 in- ches plotters to be measured in one sequence. If a machine with limited capacity is available, it is necessary to make the measurements in parts, which then have to be numerically connected to each other. It is possible to accomplish the testing of a grid with linear measure- ments only. As this method seems to imply rather tedious calculations for the determination of coordinates, it should be used for checking the accuracy of given coordinates only. The Division of Photogrammetry at the Royal Institute of Techno- logy has acquired a glass grid from Wild, Heerbrugg. The grid (No 410) is 24 X 24 cm and divided in 1-cm squares. The coordinates for each intersection have been determined to .001 mm by the manufacturer. In order to check the accuracy of the given coordinates and to develop a practical procedure for such measurements, different methods have been applied to test the grid. I. In a length comparator at the Nobel Institute of Physics in Stock- holm, longitudinal coordinates of a few points in each of six lines have been measured. For the resulting length coordinates, obtained as the arithmetic mean of four independent pointings, the standard error has been calculated to .45 microns. The measurements have been compared with the corresponding lengths, computed from the given coordinates. This comparation yields a standard deviation of 1.39 microns.

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