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Un projet pour "désensabler" la baie du Mont-Saint-Michel / Jean Denègre in Géomètre, vol 1998 n° 7 (juillet 1998)
[article]
Titre : Un projet pour "désensabler" la baie du Mont-Saint-Michel Type de document : Article/Communication Auteurs : Jean Denègre , Auteur Année de publication : 1998 Article en page(s) : pp 26 - 27 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Topographie
[Termes IGN] baie
[Termes IGN] érosion
[Termes IGN] lever topographique
[Termes IGN] Mont-Saint-Michel
[Termes IGN] simulationNuméro de notice : A1998-142 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26109
in Géomètre > vol 1998 n° 7 (juillet 1998) . - pp 26 - 27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 063-98071 RAB Revue Centre de documentation En réserve L003 Disponible Nomad's land: robotic rehearsal for the new frontier / O. Bapna in GPS world, vol 9 n° 6 (June 1998)
[article]
Titre : Nomad's land: robotic rehearsal for the new frontier Type de document : Article/Communication Auteurs : O. Bapna, Auteur ; M. Maimone, Auteur ; J. Murphy, Auteur ; E. Rollins, Auteur ; W. Whittaker, Auteur ; D. Wettergreen, Auteur Année de publication : 1998 Article en page(s) : pp 22 - 32 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Chili
[Termes IGN] Lune
[Termes IGN] National aeronautics and space administration
[Termes IGN] récepteur GPS
[Termes IGN] robotique
[Termes IGN] simulation
[Termes IGN] véhicule automobileRésumé : Un véhicule robot équipé de caméras lui permettant une vision à 360° et d'un système GPS afin de le localiser est placé dans le désert de l'Alcantama au Chili afin de simuler une expédition lunaire ou planétaire (programme Nomad de la NASA). Numéro de notice : A1998-075 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26042
in GPS world > vol 9 n° 6 (June 1998) . - pp 22 - 32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-98061 SL Revue Centre de documentation Revues en salle Disponible A watertight solution for the Ijssel / A. Schofield in GIS Europe, vol 7 n° 2 (01/02/1998)
[article]
Titre : A watertight solution for the Ijssel Type de document : Article/Communication Auteurs : A. Schofield, Auteur Année de publication : 1998 Article en page(s) : pp 20 - 22 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données laser
[Termes IGN] GPS-INS
[Termes IGN] modèle numérique de terrain
[Termes IGN] niveau de l'eau
[Termes IGN] Pays-Bas
[Termes IGN] précision centimétrique
[Termes IGN] risque naturel
[Termes IGN] rivière
[Termes IGN] simulation
[Termes IGN] télémétrie laser aéroportéRésumé : (Documentaliste) Face aux caprices de la rivière Ijssel, le gouvernement hollandais a décidé de réaliser une simulation topographique du terrain afin de déterminer et de prévoir les différents niveaux d'eau au centimètre près. Pour cela, le Ministère des Transports a opté pour le choix du laser embarqué dans un hélicoptère et du GPS pour balayer le terrain. Numéro de notice : A1998-100 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26067
in GIS Europe > vol 7 n° 2 (01/02/1998) . - pp 20 - 22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 066-98021 RAB Revue Centre de documentation En réserve L003 Disponible Development of models for monitoring the urban environment using radar remote sensing / Catherine Ticehurst (1998)
Titre : Development of models for monitoring the urban environment using radar remote sensing Type de document : Monographie Auteurs : Catherine Ticehurst, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1998 Collection : Reports from School of Geomatic Engineering num. S-54 Importance : 250 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-0-7334-1679-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] densité de population
[Termes IGN] direction de visée
[Termes IGN] image aérienne
[Termes IGN] image AIRSAR
[Termes IGN] image radar
[Termes IGN] milieu urbain
[Termes IGN] occupation du sol
[Termes IGN] polarisation
[Termes IGN] population urbaine
[Termes IGN] radar à antenne synthétique
[Termes IGN] rétrodiffusion
[Termes IGN] simulation
[Termes IGN] surveillance de l'urbanisation
[Termes IGN] télédétection en hyperfréquenceRésumé : (Auteur) The world's population is rapidly increasing, especially in urban regions to which many rural inhabitants are migrating. Such an effect results in the need for a more efficient method of monitoring cities, both in developing and developed countries. Present monitoring techniques are inefficient, and unable to effectively maintain up-to date information due to the population increase. Hence, the demand for settlement detection, urban classification and population estimation is apparent.
Radar remote sensing is showing great potential for assisting in such a matter. Its ability to discriminate between small buildings of sparse layout, and large, densely spaced, buildings is slowly being realised. This research addresses this issue through the development of a primarily theoretical model.
The urban environment is a complex mixture of built as well as natural elements. In order to simplify such a difficult situation, the backscatter expected from urban areas can be divided into simple scattering mechanisms. The most important ones chosen for this research are double bounce (from building walls and tree trunks), single bounce (from building roofs), and volume scattering (from tree canopies). The model has been designed to consider these scattering mechanisms, and their expected proportions, occurring in the urban environment.
One of the greatest difficulties created through using radar in the built environment, is due to the 'Cardinal Effect'. This occurs when there is strong double bounce scattering due to the intersection of the orthogonal building wall and ground surface being perpendicular to the look direction. An empirical investigation is conducted in the thesis to further understand this phenomenon.
In order to develop the model, many parameters, including those relating to the cardinal effect, need to be considered. Determination of such parameters is not a simple task, and requires some general assumptions to be made. The model has been designed to determine the backscatter and polarisation information for two different urban classes (ie., residential and commercial). These classes are chosen because they generally represent the low and high density urban areas respectively.
The backscatter and polarisation information from a single building is developed and then expanded into a block of buildings, with consideration of radar shadowing effects. Trees are also included in the simulated residential areas.
In order to test the accuracy of the model for residential and commercial land use, test sites representing a large range of orientation and look angles, are chosen in the city of Sydney, Australia. AirSAR data for these test sites are compared to model simulations representing the same characteristics. The results show that L-band model output is quite comparable with the real data. The P-and C-band are less reliable, with the model C-band results showing little resemblance to the AirSAR information.
For the model to be further tested, a simple classification is performed over a large area of the Eastern suburbs of Sydney. L-band data is used due to the model simulations closely represerding real data. Furthermore, the real P-, L- and C-band polarisation information were found to be quite similar, so a multiwavelength classification using radar data was not seen to contribute significant information compared to a single band.
The classification is based on a comparison between the model and AirSAR total power, polarisation index and polarisation phase difference. The classification shows that the model has the ability to distinguish between low and high density urbw areas. However, due to the difficulties in defining the characteristics of residential and commercial land uses, there is some overlap in the classification. Some tall, dense residential areas are classified as commercial. Similarly small scale commercial areas are classified to be residential. Such a problem is related to the definition of land use rather than land cover.
The most important classification parameter observed through this exercise is the total power. The polarisation index proved of little use due to its incapability of distinguishing between residential and commercial classes for the real data. Classification using the total power and polarisation phase difference together gave a less accurate result than total power alone.
However, overall results show that the potential which radar has as a remote sensing tool for distinguishing between low and high density urban areas, and for classification (under the appropriate circumstances), is quite high. This is especially so when radar is combined with other information gathering systems, such as optical remotely sensed data. Such a combination could be very beneficial for the growing need for urban monitoring and population estimation.Numéro de notice : 67410 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61751 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 67410-01 35.46 Livre Centre de documentation Télédétection Disponible The ruimpad design module : a GIS tool to support integration of urban and transportation planning / M. Van Der Vlugt (16/04/1997)
contenu dans
- Geographical Information 97: from research to application through cooperation, Third joint European conference & exhibition on Geographical Information [AM-FM], 1. Volume 1 / S. Hodgson (1997)
- Geographical Information 97: from research to application through cooperation, Third joint European conference & exhibition on Geographical Information [AM-FM], 1. Volume 1 / S. Hodgson (1997)
Titre : The ruimpad design module : a GIS tool to support integration of urban and transportation planning Type de document : Article/Communication Auteurs : M. Van Der Vlugt, Auteur ; G. Roeleveld, Auteur ; P. Van Koningsbruggen, Auteur Editeur : Oxford, Amsterdam, ... : IOS Press Année de publication : 16/04/1997 Conférence : GI 1997, 3rd joint European conference & exhibition 1997 on Geographical Information 16/04/1997 18/04/1997 Vienne Autriche Importance : pp 768 - 773 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] mobilité urbaine
[Termes IGN] Pays-Bas
[Termes IGN] planification urbaine
[Termes IGN] réseau de transport
[Termes IGN] simulation
[Termes IGN] système d'information géographique
[Termes IGN] transport urbainRésumé : (Auteur) In the Netherlands, the national spatial planning agency (RPD) has conducted the "RUIMPAD"-study, a study into new combinations in human activity patterns, spatial patterns and transportation networks. For this project, a simulation model was developed which enables the design of future urban areas and transportation networks, simulation of future displacement behaviour and traffic evaluation on criteria of sustainability. The simulation model consists of several linked computer modules, one of which is a custom -made GIS- design module, developed by AGV Traffic & Transport Consultancy Group. This GIS design toll makes it possible for experts in the field of urban and transport planning, to create spatial designs which can easily be compared and evaluated. The use of the design module has shown to bring substantial added value to the design process, making it more interactive, comparable, transparent and speedy. Even though there are some points for improvement, there is continuous interest into further development of the product. Numéro de notice : C1997-046 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65705 Analyse et mesure de l'incertitude dans un modèle de simulation / F. Leurent (1997)PermalinkEtude par simulation de la précision altimétrique et planimétrique d'un MNT obtenu par corrélation d'images spatiales (capteur à balayage) - précision d'un MNT régulier, erreur de rendu d'un semis régulier, description d'une structure de MNT régulier / Mohamed Habib (1997)PermalinkModèles statistiques des imprécisions géométriques des objets géographiques linéaires / François Vauglin (1997)PermalinkPermalinkPermalinkEtude de détectabilité de faibles déplacements du sol par GPS en continu / Paul-Henri Morel (1996)PermalinkLokale, regionale und globale Punktbestimmung mit Dreizeilenbilddaten und Bahninformation der Mars 96-Mission / T. Ohlhof (1996)PermalinkSpatial simulation modelling / A.S. Camara (01/01/1996)PermalinkUtilisation de données de télédétection au sein d'un logiciel de simulation des feux de forêts Géofeu / Laurent Demagistri in Bulletin du comité français de cartographie, n° 142 - 143 (mars - août 1995)PermalinkGIS for cities : in searching trend for development (with reference to Moscow as a city) / G.A. Gornostayeva (29/03/1994)Permalink