Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

Damen, M. C. J.

Bibliographic data

Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856343064

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

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

Editor:: Damen, M. C. J.

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 3 Spectral signatures of objects. Chairman: G. Guyot, Liaison: N. J. J. Bunnik

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Insertion of hydrological decorralated data from photographic sensors of the Shuttle in a digital cartography of geophysical explorations (Spacelab 1-Metric Camera and Large Format Camera). G. Galibert

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Insertion of hydrological decorralated data from photographic sensors of the Shuttle in a digital cartography of geophysical explorations (Spacelab 1-Metric Camera and Large Format Camera) G.Galibert Equipe Aerogéographie, Rennes, France 'ABSTRACT :Microphotographie enlargements of space imageries from the Shuttle (Metric Camera and Large Format Camera are.combined with digital maps from airborne sensors in order to realize flight documents (actual) for different aerial geophysical surveys through various data transmission networks using the Telecom 1 and the Inmarsat satellites. RESUME;Dee agrandissements de microphotographies d'images spatiales en provenance de la Navette (Chambre Métri- aue .et Chambre de Grand Format^sont combinés avec des cartes digitales acquises au moyen de capteurs aéroportés en vue de réaliser des documents réellement utilisés en vue de la navigation lors d'opérations géophysiques aériennes mettant en oeuvre différents réseuax de transmission de données par le ! satellite Télécom 1 ou le sys tème Inmarsat, 1 NEW PRODLEMS ARISING IN THE FIELD OF NAVIGATIONNAL PREPARATION OF AERIAL GEOPHYSICAL SURVEYS The use of head-up displays navigationnal aids,during aerial geophysical surveys allow to superpose on the airborne TV monitors synthetic images to the actual landscape and to the digital localization of planes and helicopters :for example in the Syledis System from Sercel-CGG,which gives an accuracy of+ or- 2 m in X and Y from ground based stations. These problems do not arise aboard of the planes when displays at the high rate of 1.2 ¡-¡pixels - 8 bits per second are currently processed.They arise during field operations of preparation when in-situ data and digital data from the central or overseas offices are integrated with very short allowed delays. Difficulties occur when important data flows from satellites,for example th~ french Telecom 1 system (ground mobile stations with flow rates of 64 Kbits or 1.92 Mbits per second ) are linked to one or more ground or off-shore based stations with possible data flow rates of 300,1200,2400 or 4800 bits per se- con.Same problems arise when ground mobile TV stations for analogical TV using the Telecom 1 satellite sys tem are linked to central offices of geophysical companies. In fact,the unique solution to such a problem is to realize the most important compression of data during all sensings and processings and to use the lowest flow rates,even 110 bits per second if necessary,more currenttv: 800 or 1200 hits per second,with the same speeds 01 uraitfemission wnen expressed in bauds. Vie will examine the problems of data compression from the Shuttle photographic imagery,which give a good cartographical generalization to surveyors. 2 RESOLVING POWER AND CARTOGRAPHICAL GENERALIZATION FROM METRIC SPACE PHOTOGRAPHS We will compare actual possibilities from two lots of photographs : two infra-red 2443 false-colour pic tures and one black and white XX positive Kodak first copies from the Metric Camera experiment (2 and 5-12 December 1983),and two black and white 3414 Kodak positive first copies from the Large Format Camera experiment (11-11-1984). 2-1 Metric Camera imagery The absence of an image-movement compensation system on the Metric Camera from Zeiss (Fed.Rep. of Germany) is not an important disadvantage in such a field of application. The following images were analyzed : n°271 IR Color (Brittany,south side of the Channel) date: 02-12-83 centre :48.2 N,001.7 W.№ 873 B.and W.(hattmark Dam Switzerland),date 05-12-83,centre 45.7 N,007.9 E.The sun elevations were comparable :19°-11«05 GMT and 15° - 09.00 GMT. After a magnification of 10 times (linear) of the copy a quasi negative print at the scale of 1/61500 approxi mately on the actual publication (see fig.2)was Eeallyi used during a short test of area navigation. The reference image,from the LFC is the figure 1 at the scale of 1 : 274200 approximately. We see(arrow)the contact between the Mattmark Dam and the rocky west side ofthe valley which is useful in order to check and calibrate the forward down loo king radars. The structure of the Spacelab 1-MC images is very propitious to fine measurements using texture analysis of the photograph (Galibert,1985)• The groups of agglutinated crystals are comparable to elementary cells of terrain analysis (Light,1986): between 3 and 10 micrometers for the black crystals, between 10 and 15 micrometers for the blue crystals, 20 to 60 micrometers on the first copies from DFLR. Vie confirm the wonderful accuracy of length measure ments along the track or across the track on MC images. In spite of an image-motion of 7,7 m along the track per millisecond of the shutter-speed,we obtained the following accuracies across the ground track and in a parallel direction to the track : across the track : Quay of Duguay Trouin dock-Harbour of Saint-Malo. actual length : 467.5 m. measured length between orange crystals : 445*0 m. difference : 22.5 m. along the track : Run-ways of Rennes-airport. The width were measured between the green crystals of the Color IR first copy. Main run-way. actual width between the grass fields : 52 m. Width on the MC photograph,which is visible between the agglomerated green and orange crystals : 49 m (the authorized width for take-off and landing is 45 m. Difference : 3 m. Unfortunately such an accuracy is conditionned by the contrast of the ground-objects.

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