Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection: Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection

Laidet, L.

Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection (Volume 2)

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Persistent identifier:: 1669258823

Title:: Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection

Sub title:: Toulouse, 13 - 17 Septembre 1982

Year of publication:: 1982

Place of publication:: Toulouse

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1669258823

Language:: English

Editor:: Laidet, L.

Corporations:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Adapter:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Founder of work:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Other corporate:: International Society for Photogrammetry and Remote Sensing, Commission VII, Interpretation of Data

Document type:: Multivolume work

Volume

Persistent identifier:: 1669259897

Title:: Actes du Symposium International de la Commission VII de la Société Internationale de Photogrammétrie et Télédétection

Scope:: XV, 415 Seiten

Year of publication:: 1982

Place of publication:: Toulouse

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1669259897

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(24,7,2)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.

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

Editor:: Laidet, L.

Corporations:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Adapter:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Founder of work:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

Other corporate:: International Society for Photogrammetry and Remote Sensing,, Commission VII, Interpretation of Data

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:: WG VII-1 METHODOLOGIE POUR L'AMELIORATION ET LA CLASSIFICATION THEMATIQUE DES DONNEES VISIBLES ET INFRAROUGE. - METHODOLOGY FOR ENHANCEMENT AND THEMATIC CLASSIFICATION OF VISIBLE AND INFRARED DATA.

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Title:: [SESSION 16]

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Title:: REMOTE SENSING FOR PLANETARY TOPOGRAPHIC MAPPING By SHERMAN S. C. WU [...]

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of the surface as well as the atmosphere of Mars. Most of the results from those experiments (UVS, IRR, IRIS, TV and S-band radio occultation) were used in topographic mapping of Mars (Wu, 1978). Sixty thousand photographs from the Viking mission make it possible to systematically map the planet Mars. The Moon, the Earth's satellite, is mapped from topographic data derived from lunar photographs and other remotely sensed data. The following sections describe interpretations of those various data. S-band Radio Occultation. The S-band radio occultation experiments were included in both the Mariner 9 and Viking missions (Kliore, et al., 1973). There were 256 usable occultation points scattered between latitudes from 486? and -80? from Mariner 9 and about 155 points scattered over the entire Martian surface from the Viking mission. At the instant of the spacecraft orbital occultation at both entry and exit, the radii of Mars at those points were determined by recording the time immediately before and immediately after an occultation (Kliore, et al., 1972). The occultation data were received at the deep space stations at Goldstone, California, Woomera, Australia, and Cebreros, Spain. The Mariner 9 occultation points have a wide distribution and have an accuracy range of from 0.25km to 1.10km. Therefore, they were used as control of the Mars global topographic map using Mariner 9 data (Wu, 1975). The comparison of the Mars global map with the 69 occultation points observed from the Viking extended mission (Lindal, et al., 1979), shows that the elevation differences range from -5 to +2.4km, with an average absolute difference of about 0.9km. The average arithmetic elevation difference is only -0.13 km, and only 13% of the points compared have elevation differences larger than 2km (WU, 1979). As shown in Figure 1, elevation differences are almost zero in the north and gradually increase to the south because the map was originally compiled from data that were sparse and unreliable in the south. Ultraviolet Spectrometer (UVS). One of the objectives of the ultraviolet spectrometer experiment of Mariner 9 was to measure the composition and pressure of the martian atmosphere at the surface of Mars (Barth, et al., 1972). The reflected ultraviolet intensity is a measure of the number of atmospheric scatters. The local pressure can then be determined from these intensity measurements, and the variations of local pressure can be interpreted to measure the martian topography (Barth and Hord, 1971). There are almost 7,500 measurements of elevation provided by the UVS experiment along 39 revolutions (paths 140 to 216) of the Mariner 9 spacecraft; covering the planet Mars, from 60? south latitude to 45? north (Wu, 1975). The resolution is about 30km. Infrared Interferometer Spectrometer (IRIS) and Infrared Radiometer (IRR). The infrared interferometer spectrometer was experimented with to infer the martian atmosphere and surface parameters which include the temperature for a vertical temperature structure. It also provides topographic information through the absorption of certain bands of CO0,. The local variations are claimed to be reliable to 0.5km, But the absolute accuracy is about lkm (Herr and Pimentel, 1969, Hanel, et al., 1970, Hanel, et al., 1972). The infrared radiometer is used to infer the thermal properties of the martian surface (Chase, et al. 1972). The data can also be used to compile a temperature map which can be correlated with topographic variations (Cunningham and Schurmeier, 1969). There are about 4,600 elevation points provided from the infrared experiment also observed along the paths of Mariner 9, covering the planet Mars from 65? south latitude to 40? north (Wu, 1975). Earth base Radar Data. From radar observations, altitudes on the martian surface are calculated from signal time delay. In other words, variations in radar travel time to and from Mars are associated with the topographic relief 180° on the marti as 8 km and direct trans 200m. The a and the assu More th Goldstone, C various sens map. About et al., 1969 Goldstone Ob : data cover t South. The

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