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Development of models for monitoring the urban environment using radar remote sensing / Catherine Ticehurst (1998)

Public 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 hyperfréquence Résumé : (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

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
67410-01	35.46	Livre	Centre de documentation	Télédétection	Disponible

Real-time estimation of ionospheric delay using GPS measurements / L.S. Lin (1998)

Public Titre : Real-time estimation of ionospheric delay using GPS measurements Type de document : Monographie Auteurs : L.S. Lin, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1998 Collection : Reports from School of Geomatic Engineering Importance : 200 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] correction ionosphérique [Termes IGN] filtre de Kalman [Termes IGN] ionosphère [Termes IGN] modèle ionosphérique [Termes IGN] positionnement par GNSS [Termes IGN] propagation ionosphérique [Termes IGN] temps réel [Termes IGN] teneur totale en électrons [Termes IGN] traitement de données GNSS [Termes IGN] trajet multiple Index. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Numéro de notice : 67500 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61797

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
67500-01	30.61	Livre	Centre de documentation	Géodésie	Disponible

The nature and management of positional relationships within a local government Geographic Information System / D.B. Lemon (1998)

Public Titre : The nature and management of positional relationships within a local government Geographic Information System Type de document : Monographie Auteurs : D.B. Lemon, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1998 Collection : Reports from School of Geomatic Engineering num. S-53 Importance : 260 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] collectivité territoriale [Termes IGN] géopositionnement [Termes IGN] relation topologique [Termes IGN] système d'information géographique Numéro de notice : 67487 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61787

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
67487-01	37.30	Livre	Centre de documentation	Géomatique	Disponible

Carrier phase-based long-range GPS kinematic positionning / S. Han (1997)

Public Titre : Carrier phase-based long-range GPS kinematic positionning Type de document : Monographie Auteurs : S. Han, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1997 Collection : Reports from School of Geomatic Engineering num. S-49 Importance : 185 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] GPS en mode cinématique [Termes IGN] mesurage de phase [Termes IGN] phase GPS [Termes IGN] positionnement cinématique Index. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Numéro de notice : 67488 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61788

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
67488-01	30.61	Livre	Centre de documentation	Géodésie	Disponible

A digital photogrammetry system for industrial monitoring / Y. Huang (1997)

Public Titre : A digital photogrammetry system for industrial monitoring Type de document : Monographie Auteurs : Y. Huang, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1997 Collection : Reports from School of Geomatic Engineering num. S-47 Importance : 150 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-0-85839-072-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] chambre métrique [Termes IGN] détection d'objet [Termes IGN] métrologie dimensionelle [Termes IGN] orientation du capteur [Termes IGN] photogrammétrie numérique [Termes IGN] reconstruction 3D [Termes IGN] station de travail de photogrammétrie numérique Index. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) The purpose of this research is to study methods used in digital photogrammetry and machine vision, and develop them into a measuring system for industrial monitoring. The digital photgrammetry system includes steps of camera orientation, feature extraction, 3D object construction and the application of the recognition of regular objects. Numéro de notice : 67483 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61784

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
67483-01	33.30	Livre	Centre de documentation	Photogrammétrie - Lasergrammétrie	Disponible

Low-cost GPS systems for intermediate surveying and mapping accuracy applications / M.D. Subari (1997)

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Tectonic interpretation of the Papua New Guinea region from repeat satellite measurements / K. Mobbs (1997)

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