VIIIth International Congress of Photogrammetry: National reports

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

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:: 1048997537

Title:: National reports

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

Scope:: circa 260 Seiten in verschiedenen Seitenzählungen

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048997537

Illustration:: Illustrationen

Signature of the source:: ZS 312(12,2)

Language:: French

Other Title:: Paralleltitel: Rapports nationaux

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:: REPORT OF THE FINNISH SOCIETY OF PHOTOGRAMMETRY 1952 - 1956

Document type:: Multivolume work

Structure type:: Chapter

Finland of Zeiss cameras RMK HS 21/18 x 18 (Orthometar), RMK HS 10/18 X 18 (Topogon), RMK 21/18 x 18 (Topar) and others, Zeiss stereoplanigraphs C5, Wild autographs A7 and A8, Zeiss Multiplex and Stereotop instruments etc. Among the rectifiers Zeiss SEG V takes the first place. The aerial photography is carried out by the Air Forces, according to plans and using cameras and other equipment placed at their disposal by these two offices. Processing and further treatment of the aerial films as well as the organization of the picture archives is done by them too. Two Percival Pembroke survey air planes were purchased by the General Survey Office to be used for aerial photography by the Air Forces. In addition to ordinary mapping the mentioned instances prepare various aerial mapping works for other government establishments, towns and private undertakings. Pictures are delivered also for communal tax equalization surveys, geological surveys, forestry work, for planning of power plants etc. The Chart Section of the Board of Navigation prepares nautical charts, including inland water charts with the aid of photomaps. The Decca navigation system is also used in the echo sounding on the Gulf of Bothnia. More than 30 000 km 1 2 are yearly photographed for different purposes and the total area covered by air pictures is now about 289000 km 2 or 86 % of the total area of Finland. Special photogrammetric methods and investigations. The component angles of tilt of the aerial camera are in Finland determined by the horizon method 1 2 The relative component angles are measured from the two horizon pictures with a mean error of about 2',5 (centesimal minutes). 4 For stereotriangulation purposes two pairs of pictures in every strip of 15 to 20 pictures are absolutely orientated in the stereoplanigraph using ground control. With the obtained correction angles the absolute components of tilt for the whole strip are calculated. The obtained mean error of the latter ones is about ^ 4',o for the longitudinal and ^ 2/7 for the lateral tilt. Horizon controlled stereotriangulation 2 is used to obtain hori zontal and vertical control for stereoplotting of a map 1 : 100 000 in Multiplex. With a wide angle camera f = 10 cm, flying height 4000 m the photography is performed at the scale 1 : 40 000. The length of the strips is 40 km and ground control is established in distances of about 20 km in each strip. The essence of the stereotriangulation applied here is that every stereomodel is levelled in the stereoplanigraph according to the predetermined absolute components of tilt. For checking of the accuracy of this kind of stereotriangulation, points of horizontal control were measured in distances of about 4 km and along the edges of two test strips, vertical control was levelled in the field. The results have proved that the accuracy obtained (mean square error m x = rriy = -j- 3,0 m and m^ 2,1 m) is satisfactory for the purpose in question. The practical works carried out until now (about 500 pictures) have shown the stabilizing 1 influence of predetermined tilt components for the stereotriangulation. The mean square error of the extended net of horizontal and vertical control obtained in the conditions men tioned above are m x — m y = j; 3 to 4 m and /«h = ¿2 to 2,5 m. Substitution of scale check lines by vertical control is a new method for determination of the enlarging ratio 3 of each air picture in the rectifier. Until 1 Löfström, K.: Die letzen Fortschritte in der Horizont- und Statoskopvermessung. Schwei zerische ZfV., 1946: 7. 2 Löfström, K. G.: Horizontkontrollierte Aeropolygonierung. Veröff. des finnischen Geod. Institutes, N:o 46, S. 125—143, Helsinki, 1955. 3 Laurila, Simo: Applied scale point method in Finnish practice. Photogrammetria, 1949 ~^5° : 3- 4 R. S. H a 1 o n e n: Über die Genauigkeit der Methoden zur Bestimmung der äusseren Orien tierungsgrössen der Luftkammer. Dissertat. T. H. Helsinki, 1951.

Access restriction

Copyright

fullscreen: National reports (Part 2)

Multivolume work

Volume

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation