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Evaluation of land use and cover changes in North Shaanxi, China / W. Wu in Photo interprétation, vol 39 n° 2 (Juin 2003)

Public [article]  inPhoto interprétation > vol 39 n° 2 (Juin 2003) . - pp 15 - 29 Titre : Evaluation of land use and cover changes in North Shaanxi, China Type de document : Article/Communication Auteurs : W. Wu, Auteur Année de publication : 2003 Article en page(s) : pp 15 - 29 Langues : Anglais (eng) Français (fre) Descripteur : [Vedettes matières IGN] Photo-interprétation [Termes IGN] analyse diachronique [Termes IGN] Chensi (Chine) [Termes IGN] classification [Termes IGN] désertification [Termes IGN] environnement [Termes IGN] géographie humaine [Termes IGN] image Landsat-TM [Termes IGN] image multitemporelle [Termes IGN] occupation du sol [Termes IGN] surface cultivée Résumé : (Auteur) As a transitional belt between the Mu Us Sandy Land and Loess Plateau, the north part of Shaanxi is one of the ecologically vulnerable and areas in northwest China, which are subject to the impacts of both natural factors and human activity. It is therefore of special importance to select such an area to carry out an intensive land use change study and establish a dynamic monitoring system thereof aiming at understanding the change mechanism, human-environmental relationships and producing useful references for the central and local governments in their sustainable land use planning. Multitemporal Landsat images were used for change detection by adopting a synthetic method including atmospheric correction, Tasseled Cap transformation, indicator differencing, thresholding, change type identification and county-level quantification. A classification on the recent image was conducted to quantify the present land use and cover pattern. A panel analysis calibrated by multivariate regression model was applied to reveal the driving forces of land cover changes and understand the interaction between the human activities and environment modifications by incorporating the results obtained from the change detection with the county-level socio-economic data. The regression modelling results suggest that the vegetation degradation- the predominant change type in the study area, is probably related to the soil erosion (R' = 0.994) and grassland degradation; the farmland extension, occurring principally in the valleys in the Yulin County, is associated with the foodproduct increase (R' = 0.987); the urban extension, spatially related to coal mining, is linked to the urban population growth (R' = 0. 881); and the surface decrease of waterbodies, having taken place in the sandy land, is negatively correlated to the cultivated land change (R' = 0. 562). Therefore, the factors which govern these land use and cover changes are various human socio-economic activities, and the root cause of land degradation is, however, some unreasonable land use policies. Numéro de notice : A2003-392 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26472 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
104-03021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Application of remote sensing to the urban expansion analysis for Nouakchott, Mauritania / W. Wu in Geocarto international, vol 18 n° 1 (March - May 2003)  

Public [article]  inGeocarto international > vol 18 n° 1 (March - May 2003) . - pp 17 - 24 Titre : Application of remote sensing to the urban expansion analysis for Nouakchott, Mauritania Type de document : Article/Communication Auteurs : W. Wu, Auteur ; Marie-Françoise Courel, Auteur ; J. Le Rhun, Auteur Année de publication : 2003 Article en page(s) : pp 17 - 24 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse spatiale [Termes IGN] croissance urbaine [Termes IGN] dégradation de l'environnement [Termes IGN] données démographiques [Termes IGN] image multitemporelle [Termes IGN] image SPOT-HRV [Termes IGN] impact sur l'environnement [Termes IGN] inondation [Termes IGN] modélisation spatiale [Termes IGN] Nouakchott [Termes IGN] planification urbaine [Termes IGN] risque naturel [Termes IGN] urbanisation Résumé : (Auteur) Nouakchott, the capital of Mauritania, has stepped into a rapid urbanisation stage since 1980s, especially in the last decade. The population growth in a narrow corner between the Atlantic Ocean and Sahara Desert, exposed to several risks of natural disasters, has produced an overburden to the infertile land and at the same time led to a degradation of the urban environment and difficulty of life. This research is focused on an urban expansion analysis and flood risk assessment by remote sensing techniques utilising multitemporal SPOT/HRV images and demographic data. Our aims are to understand the factors influencing expansion, evaluate the means of controlling environmental impacts and produce useful references for the future urban planning. The results show that Nouakchott had extended by 36 km2 at an annual growth rate of 5.3% and an average extension rate of 3.6 km2/yr corresponding to a population growth about 380,000 people from 1989 to 1999. Regression analysis suggests that the latter is the main dynamics driving the urban expansion (R' = 0.9873). Furthermore, the littoral depression, a belt in peril of seawater inundation between the coastal sandbar and urban districts, where future urban construction is recommended to avoid, was analysed and three risk degrees graded by spatial modelling. And finally, three inneglected points proposed for consideration in the future urban planning were discussed in this paper. Numéro de notice : A2003-099 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040308542259 En ligne : https://doi.org/10.1080/10106040308542259 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22395 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
059-03011	RAB	Revue	Centre de documentation	En réserve L003	Disponible