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Applications of remote sensing and geographic information systems for urban land-cover change studies in Mongolia / D. Amarsaikhan in Geocarto international, vol 24 n° 4 (August - September 2009)  

Public [article]  inGeocarto international > vol 24 n° 4 (August - September 2009) . - pp 257 - 271 Titre : Applications of remote sensing and geographic information systems for urban land-cover change studies in Mongolia Type de document : Article/Communication Auteurs : D. Amarsaikhan, Auteur ; H. Blotevogel, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 257 - 271 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse diachronique [Termes IGN] changement d'occupation du sol [Termes IGN] classificateur paramétrique [Termes IGN] détection de changement [Termes IGN] fusion d'images [Termes IGN] image multitemporelle [Termes IGN] milieu urbain [Termes IGN] Mongolie [Termes IGN] occupation du sol [Termes IGN] système d'information géographique Résumé : (Auteur) The aim of this study is to compare the changes that occurred in the main urban land-cover classes of Ulaanbaatar city, Mongolia, during a centralized economy with those that occurred during a market economy and to describe the socio-economic reasons for the changes. For this purpose, multi-temporal remote sensing and geographical information system (GIS) data sets, as well as census data, are used. To extract the reliable urban land-cover information from the selected remotely sensed data sets, a refined parametric classification algorithm that uses spatial thresholds defined from local and contextual knowledge is constructed. Before applying the classification decision rule, some image fusion techniques are applied to the selected remotely sensed data sets to define the most efficient fusion method for training sample selection and for defining local and contextual knowledge. Overall, the study indicates that during the centralized economy significant changes occurred in a ger area of the city, whereas during the market economy the changes occurred in all areas. Copyright Taylor & Francis Numéro de notice : A2009-305 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040802556173 Date de publication en ligne : 23/07/2009 En ligne : https://doi.org/10.1080/10106040802556173 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29935 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-09041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Finding appropriate interpolation techniques for topographic surface generation for mudslide risk zonation / A. Vansarochana in Geocarto international, vol 24 n° 4 (August - September 2009)  

Public [article]  inGeocarto international > vol 24 n° 4 (August - September 2009) . - pp 313 - 332 Titre : Finding appropriate interpolation techniques for topographic surface generation for mudslide risk zonation Type de document : Article/Communication Auteurs : A. Vansarochana, Auteur ; N.K. Tripati, Auteur ; R. Clemente, Auteur Année de publication : 2009 Article en page(s) : pp 313 - 332 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] effondrement de terrain [Termes IGN] fonction spline d'interpolation [Termes IGN] image Landsat-ETM+ [Termes IGN] interpolation [Termes IGN] interpolation inversement proportionnelle à la distance [Termes IGN] krigeage [Termes IGN] modèle numérique de surface [Termes IGN] pente [Termes IGN] risque naturel Résumé : (Auteur) Mudslides and debris flows are now more common problems in tropical regions than landslides. This article addresses the issue of modelling mudslide-susceptible locations using an information value approach. Landsat 7 (ETM+) was employed to create a land-use map with limited field checks. Other parameters considered were lineament, road, soil, stream network and lithology. Topographic parameters such as slope and aspect play a dominant role in slope stability studies. Maps for slope and aspects were developed from a digital elevation model using statistical surface interpolation techniques. This article offers insight into the importance of the selection of suitable surface interpolation techniques. The three surface interpolation techniques evaluated in the study were: inverse distance weighted, Kriging and Spline. These were found to have varied accuracies of interpolation surfaces for all parameters, including elevation, slope and aspect. Surfaces offering the best accuracy were adopted for the information value approach for mudslide susceptibility zonation. Copyright Taylor & Francis Numéro de notice : A2009-306 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040802556173 Date de publication en ligne : 23/07/2009 En ligne : https://doi.org/10.1080/10106040802556173 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29936 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-09041	RAB	Revue	Centre de documentation	En réserve L003	Disponible