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Georeferencing performance of THEOS satellite imagery / S. Liu in Photogrammetric record, vol 26 n° 134 (June - August 2011)  

Public [article]  inPhotogrammetric record > vol 26 n° 134 (June - August 2011) . - pp 250 - 262 Titre : Georeferencing performance of THEOS satellite imagery Type de document : Article/Communication Auteurs : S. Liu, Auteur ; Clive Simpson Fraser, Auteur ; C. Zhang, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 250 - 262 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] géoréférencement direct [Termes IGN] image à très haute résolution [Termes IGN] image Theos [Termes IGN] ligne de visée [Termes IGN] Melbourne [Termes IGN] modèle géométrique de prise de vue [Termes IGN] orientation du capteur [Termes IGN] point d'appui [Termes IGN] THEOS Résumé : (Auteur) This paper reports on the application of a generic physical sensor orientation model for evaluation of the georeferencing performance of 2 m resolution imagery from the Thailand Earth Observation System (THEOS) satellite. Within the generic sensor orientation model, orbit and attitude data are employed to describe the satellite trajectory, which is further modelled by splines. The satellite orbit and sensor attitude errors are then compensated via sensor orientation adjustment using a modest number of ground control points (GCPs), resulting in improved georeferencing. The generic sensor model and the integration of the THEOS orientation parameters into the model are first described. The presence of errors in the satellite line-of-sight data, which result in imprecise sensor interior orientation are then discussed. Such errors can be effectively accounted for through modelling via a cubic polynomial, leading to sub-pixel georeferencing accuracy. An account is then given of an experimental evaluation of THEOS georeferencing conducted in a well-established testfield near Melbourne, Australia. The results demonstrate that sub-pixel 2D geopositioning accuracy is readily achievable with single THEOS images and within strips of up to three images, with as few as six GCPs to effect an orbit adjustment. However, accuracy decreases to near the 2-pixel level over a strip length of five images. Numéro de notice : A2011-243 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00634.x Date de publication en ligne : 06/06/2011 En ligne : https://doi.org/10.1111/j.1477-9730.2011.00634.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31021 [article]

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Developments in South & East Asia: Space image acquisition for geospatial intelligence / Gordon Petrie in Geoinformatics, vol 10 n° 3 (01/04/2007)

Public [article]  inGeoinformatics > vol 10 n° 3 (01/04/2007) . - pp 38 - 45 Titre : Developments in South & East Asia: Space image acquisition for geospatial intelligence Type de document : Article/Communication Auteurs : Gordon Petrie, Auteur Année de publication : 2007 Article en page(s) : pp 38 - 45 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] acquisition d'images [Termes IGN] ALOS [Termes IGN] CARTOSAT [Termes IGN] CBERS [Termes IGN] Chine [Termes IGN] Corée du sud [Termes IGN] image satellite [Termes IGN] Inde [Termes IGN] Japon [Termes IGN] KOMPSAT [Termes IGN] Malaisie [Termes IGN] Panchromatic Remote Sensing Instrument for Stereo Mapping [Termes IGN] ROCSAT [Termes IGN] Taïwan [Termes IGN] Thaïlande [Termes IGN] THEOS [Termes IGN] Tsinghua (microsatellite) Résumé : (Auteur) By far the biggest source of the data needed for geospatial intelligence purposes comes from the high resolution imagery acquired from spaceborne and airborne platforms. In the specific context of South and East Asia, where there are numerous concerns about national security and threats from neighbours, the primary source for this type of intelligence is spaceborne imagery. Indeed the defence and security agencies in the larger countries in this part of Asia have all been large consumers of the high-resolution space imagery provided, by commercial suppliers such as GeoEye, DigitalGlobe, SPOT Image and ImageSat International. However, recently, nearly all of these Asian countries have either acquired or they are creating their own national capabilities to acquire this type of imagery to overcome the actual or potential restrictions and the delays that occur with the supply of space imagery from sources out with their control. The situation has already been discussed in a preliminary manner in an article published in Geolnformatics by the present writer three years ago (in the March 2004 issue) as part of his world wide survey of high-resolution imaging from space. This new article will concentrate on the many new developments that have taken place in the region since then. Copyright GeoInformatics Numéro de notice : A2007-197 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28560 [article]

Thailand Earth Observation System: mission and products / M. Kaewmanee in Revue Française de Photogrammétrie et de Télédétection, n° 185 (Mars 2007)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 185 (Mars 2007) . - pp 12 - 18 Titre : Thailand Earth Observation System: mission and products Type de document : Article/Communication Auteurs : M. Kaewmanee, Auteur ; T. Choomnoommannee, Auteur ; R. Fraisse, Auteur Année de publication : 2007 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 12 - 18 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] image multibande [Termes IGN] image panchromatique [Termes IGN] mission spatiale [Termes IGN] satellite agile [Termes IGN] secteur terrien [Termes IGN] THEOS Résumé : (Auteur) Thailand Earth Observation System (THEOS) Development Program was begun in July 2004. The program is developed by Geo-Informatics and Space Technology Development Agency (Public Organization) (GISTDA) under the Ministry of Science and Technology, with European Aeronautic Defence and Space Company - Astrium (EADS Astrium SAS), in France, as a prime contractor. It consists of design, development, test, launch, and commissioning phases of THEOS satellite, as well as integration with associated control and data exploitation ground facilities. The aim of this paper is to present the characteristics of THEOS program which consists of the system architecture, satellite architecture, its associated ground facilities (Control Ground Segment and Image Ground Segment) and their products. THEOS satellite is a compact and agile satellite with a mass of 750 kilograms and a power consumption of 800 Watts. It has two push-broom scanning optical instruments, providing worldwide imagery in Panchromatic and Multispectral modes, covering the Visible and Near Infrared spectrum. The Panchromatic instrument has a resolution of 2 metres and a swath width of 22 kilometres. The Multispectral instrument has a resolution of 15 metres and a swath width of 90 kilometres. The satellite will be launched into a sun-synchronous low earth orbit in July 2007 and will have a design lifetime of at least 5 years. THEOS CGS (Control Ground Segment) will be established in Thailand to provide commands and control of the satellite. The satellite can be programmed either to downlink image data in real-time imaging or to read from the onboard memory and transmit image data recorded earlier during the same or previous orbital revolutions. Facilities will be provided at this station to accommodate the reception and processing of the data. THEOS system routine operational activities are organised on a daily basis with flexibility enabling to urgent requests. Data downlinked from the instrument will be transmitted to THEOS IGS (Image Ground Segment). The role of THEOS IGS is to provide value added products from THEOS images corresponding to end users' needs. It is equipped with a 13m X band antenna and RF electronics. Its hardware and software enable the automatic processing of the transmitted image telemetry (at 120 Mbps) up to level 2A. The 4 working stations of the Image Exploitation Facility provide high level tools to generate added value and precision product. Copyright SFPT Numéro de notice : A2007-396 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/T04-16.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28759 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
018-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible