Actes du 7ième Congrès International de Photogrammétrie: Actes du 7ième Congrès International de Photogrammétrie

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Multivolume work

Persistent identifier:: 1048858235

Title:: Actes du 7ième Congrès International de Photogrammétrie

Sub title:: Washington, septembre 1952

Year of publication:: 1954

Place of publication:: Amsterdam

Publisher of the original:: Argus [u.a.]

Identifier (digital):: 1048858235

Language:: English

Other Title:: Paralleltitel: Proceedings of the 7th International Congress of Photogrammetry

Corporations:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Adapter:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Document type:: Multivolume work

Volume

Persistent identifier:: 104885955X

Title:: Actes du 7ième Congrès International de Photogrammétrie

Sub title:: Proceedings of the 7th International Congress of Photogrammetry

Scope:: circa 800 Seiten in verschiedenen Seitenzählungen

Year of publication:: 1954

Place of publication:: Amsterdam

Publisher of the original:: Argus u.a.

Identifier (digital):: 104885955X

Illustration:: Illustrationen

Signature of the source:: ZS 312(11,2)

Language:: French

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

Corporations:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Adapter:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 7., 1952, Washington; American Society of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 7., 1952, Washington; American Society 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:: STEREOSCOPIC MAPPING WITH THE U.S. COAST AND GEODETIC SURVEY NINE-LENS CAMERA by William D. Harris.

Document type:: Multivolume work

Structure type:: Chapter

(404) STEREOSCOPIC MAPPING WITH THE U.S. COAST AND GEODETIC SURVEY NINE-LENS CAMERA by William D. Harris. It is doubtful that the nine-lens camera would have been developed if so many difficulties had not been encountered in using single-lens cameras to make photogrammetric surveys of coastal areas. Much of the coastline of the United States and Alaska is so irregular that single-lens photographs will not span across rivers and bays or from the mainland to offshore rocks and islands. The nine-lens camera has not only solved the problems involved in mapping coastal areas, it has proven to have many advantages over the single-lens camera in every type of mapping problem. The 210 mm normal angle lenses which are used in this camera give pho- tographic resolution and scale comparable with the normal angle lenses often used for large scale single-lens mapping. Resolution is further improved by less camera vibration possibly due to the massive rigid construction of the camera. The nine-lens camera has never been given a formal airborne resolving power test with the standard high contrast resolution targets but it is not uncommon to observe the low-contrast plow furrows in farmlands reproduced in the final print at a spacing of 18 to 20 lines per millimeter. The camera covers an angular field of 135 degrees which gives a base-height ratio of 1.6 with an overlap of 65 per cent. The ground area coverage is nine times that of the wide-angle 6 inch single-lens camera at the same flying height and sixteen times as much at the same scale. To illustrate the great coverage of the photograph, a 1: 30,000 scale print images a square 17 miles of 27 kilometers on a side. The area covered is 289 square miles. — . The photograph is 35 inches square and has a principal distance of 8'/. inches. The maximum error of image position is 0.15 mm from that of a cor- rect perspective view. This precision in fitting the nine separate views into a single composite photograph is obtained by careful adjustment of the air camera and appropriate adjustments of the transforming printer to care for variations in dimensions of the film air negative. An airborne performance test is made each year, by photgraphing some eighty ground targets which have been located by first and second order triangulation and leveling. The elements of the transforming printer are then adjusted to make a correct photograph of the ground test area and the position of fiducial marks thus obtained is dupli- cated when making subsequent prints. Probably the most outstanding features of the nine-lens process are that it requires only about one third the usual amount of horizontal ground control and that the control may be established independent of the photographic plan. This means that the control can, if necessary, be established in advance of the aerial photography; that there are no special control position requirements, such as two points in the first model of each strip of photographs. It also means that usually all control can be established by triangulation using such objects as chimneys, steeples, water tanks, mountain peaks and pinnacle rocks. There —— AO QO 4 (fO ect 4 wm —(P (f Fr F^ ^") ™ BE FF ^N fr

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