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:: APPLICATION OF PHOTOGRAMMETRY IN ROAD LOCATION IN TROPICAL AREAS by B. Scherpbier. [...]

Document type:: Multivolume work

Structure type:: Chapter

is always a risk of overlooking a good alternative route in the dense jungle, and there is also the possibility that the subsequent detailed mapping may produce sudden surprises with regard to ground conditions, resulting in loss of time and labour. Application of photogrammetry can save much of the time and expense and weary plodding of survey groups through dense tropical jungle involved in both these methods and also, as far as the second method is concerned, ensure a greater degree of certainty of having found the right location. Photogrammetric mapping). If the area under consideration is covered by aerial photographs, stereoscopic study of these prints might enable a location to be worked out which will be suited to topographical conditions. This simple method, which may, however, take up a lot of time, does not readily permit the situation to be viewed as a whole, and may therefore lead to promising possibilities being overlooked. Accordingly, the most economical method of working is to prepare, with the help of aerial photographs, a reliable topographical map with contour lines, on which the alternatives for the location can be projected. The aerial photographs are also used for terrain studies. Further reference will be made to this later. Flying scheme and ground control. For use in the preparation of maps as mentioned above, aerial photographs must be made according to a good flying scheme and with adequate forward and side overlap. Ground control in jungle-covered undeveloped areas is an expensive and difficult item. It is of major importance to economize in this and thus reduce the number of costly expeditions in the area, and aerial triangulation is therefore a very welcome asset in preparing the maps. By applying aerial triangulation ground control can be reduced to the measuring of a few bases of, say, 8—10 kilometres long. About 4 points of each base are marked by ground marks before photo- graphy is carried out, or about 4 identifiable points are sought on each base and connected by a traverse or another ground survey method. The elevation of the points should be measured, as well as the azimuth and distance. It has been found possible in practice to bridge a distance of about 100 km. between ground control, using double-image instruments like the stereoplanigraph or another instrument of this type. For the elevation more ground control is desirable but if, because of field conditions, this additional ground control cannot be obtained economically, use of the water level along the sea coast and rivers, and consideration of the general drainage scheme of the area, will give enough ties for levelling the stereo-models with adequate accuracy. By using this latter method a slight general slope of the reference plane may sometimes occur, but this does not generally affect the usefulness of the prelimi- nary project. When the definite location of the road or other civil engineering 1) The aerial triangulation and the plotting from aerial photographs for the preparation of the topographical maps referred to hereafter has been carried out at the Photogrammetric Depart- ment of Public Works at Delft (Netherlands). 2

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