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The use of Landsat derived multi-temporal NDVI to assess the impact of the construction of the central Pilbara railway on vegetation conditions, Karijini / J. Wilson in Geocarto international, vol 17 n° 1 (March - May 2002)  

Public [article]  inGeocarto international > vol 17 n° 1 (March - May 2002) . - pp 13 - 20 Titre : The use of Landsat derived multi-temporal NDVI to assess the impact of the construction of the central Pilbara railway on vegetation conditions, Karijini Type de document : Article/Communication Auteurs : J. Wilson, Auteur ; P. Hick, Auteur ; R. Hickey, Auteur Année de publication : 2002 Article en page(s) : pp 13 - 20 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse diachronique [Termes IGN] Australie [Termes IGN] détection de changement [Termes IGN] données multitemporelles [Termes IGN] image Landsat [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] parc naturel national [Termes IGN] photo-interprétation [Termes IGN] réseau ferroviaire [Termes IGN] télédétection spatiale Résumé : (Auteur) The Central Pilbara Railway (CPR) was constructed in 1992 by Hamersley Iron Pty Ltd to provide a transport link between Marandoo and the proposed Yandicoogina Mine in the Central Pilbara, Western Australia. The 400 km line connects to the port of Dampier to the huge iron ore resources in the central Pilbara and a section of nearly 100 km of the railway passes through the Karijini National Park. The main area of interest in this study is within this strip and in particular the section 500 metres either side of the railway centreline between Marandoo and the eastern boundary of the park near Juna Downs. This study uses multi-temporal satellite data to determine the prior status and the impact on vegetation condition from the construction and operation of the CPR. This method was tested using one kilometre sub-divisions along and 100 metre segments away from the line within a 500 metre zone around the CPR. It was found that change in vegetation condition is significantly greater closer to the railway centreline than farther away. The significant decrease in vegetation condition occurs only in the 0 to 100m segment, but not beyond and the vegetation decrease may be considered an inevitable result of the CPR. It appears that wild-fires have the greatest impact on vegetation condition in this region and the impact of the CPR is minimal by comparison. Numéro de notice : A2002-120 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040208542221 En ligne : https://doi.org/10.1080/10106040208542221 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22035 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Fuzzy modelling of African ecoregions and ecotones using AVHRR NDVI temporal imagery / M. Ji in Geocarto international, vol 17 n° 1 (March - May 2002)  

Public [article]  inGeocarto international > vol 17 n° 1 (March - May 2002) . - pp 21 - 30 Titre : Fuzzy modelling of African ecoregions and ecotones using AVHRR NDVI temporal imagery Type de document : Article/Communication Auteurs : M. Ji, Auteur Année de publication : 2002 Article en page(s) : pp 21 - 30 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Afrique (géographie politique) [Termes IGN] écosystème [Termes IGN] flore locale [Termes IGN] image multibande [Termes IGN] image multitemporelle [Termes IGN] image NOAA-AVHRR [Termes IGN] logique floue [Termes IGN] modélisation [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] télédétection spatiale Résumé : (Auteur) Conventional methods of deriving global or continental vegetation maps from the National Oceanic and Atmospheric Administration's (NOAA) Advanced Very High Resolution Radiometer (AVHRR) time series data are based on two-value Boolean logic, which cannot properly model the so-called ecotone, the transition zone between adjacent ecosystems. New methods and data models that have been developed on the basis of fuzzy logic to address the "mixedpixel " issue in multi-spectral imagery can also be used with multi-temporal imagery to handle the mixture of vegetation types within an ecotone. This study introduces the concept of semantic space and its transformation from spectral feature space, which utilizes a fuzzy logic approach to characterize the continuum of vegetation communities in the African continent from AVHRR multi-temporal (12 months for three years from 1986 to 1988) NDVI data. The fuzzy procedure was based an the Fuzzy c-Means (FCM) algorithm with significant modifications to improve processing speed for handling large volumes of data. A second-order mapping approach was also devised to explicitly represent subdominant vegetative coverage in ecotones and other heterogeneous regions. Comparisons between a Sub-Saharan African Vegetation Map compiled by the International Union for Conservation of Nature (IUCN) in 1986 and the maps derived from this study demonstrated that fuzzy modeling and classification might provide a better and more realistic representation of the vegetative characteristics of the region. Numéro de notice : A2002-121 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040208542222 En ligne : https://doi.org/10.1080/10106040208542222 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22036 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The utility of very high spatial resolution images to identify urban objects / Anne Puissant in Geocarto international, vol 17 n° 1 (March - May 2002)  

Public [article]  inGeocarto international > vol 17 n° 1 (March - May 2002) . - pp 31 - 41 Titre : The utility of very high spatial resolution images to identify urban objects Type de document : Article/Communication Auteurs : Anne Puissant, Auteur ; Christiane Weber, Auteur Année de publication : 2002 Article en page(s) : pp 31 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] classification par maximum de vraisemblance [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] image ORBVIEW [Termes IGN] image SPOT 5 [Termes IGN] image SPOT-HRG [Termes IGN] milieu urbain [Termes IGN] morphologie mathématique [Termes IGN] objet géographique [Termes IGN] photo-interprétation assistée par ordinateur [Termes IGN] Strasbourg Résumé : (Auteur) With the diversity of new digital geographic information products and in particular, the new future Very High Spatial Resolution images (1 to 5 m), an evaluation of the capacity of these new data source is necessary in the framework of urban studies. This article aims at assessing the utility of VHSR sensors to provide reliable and useful information for the end-users (city councils, urban community, county) in urban planning, monitoring and management. In fact, which type of end-users must these resolution satisfy, what are the potential applications of these images, what are the characteristics of the information required and finally what type of extraction methods are efficient ? An analysis of these capacities has been carried out for different resolutions and with several extraction methods. This analysis allows on the one hand, to define a " minimal " and a " functional " spatial resolution able to satisfy the needs of end-users, and on the other hand, to determine if this future sensors would provide additional capabilities to study the urban environment. Numéro de notice : A2002-122 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040208542223 En ligne : https://doi.org/10.1080/10106040208542223 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22037 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible