Papers by Jean-Baptiste Chevance
Le Phnom Kulen, eminence greseuse a une trentaine de kilometres au nord-est d'Angkor se carac... more Le Phnom Kulen, eminence greseuse a une trentaine de kilometres au nord-est d'Angkor se caracterise par sa topographie et son reseau hydrographique. Il est la source des principaux cours d'eau irriguant la region. Les donnees epigraphiques et la presence d'un ensemble de monuments, indiquent que le plateau accueillit a l'aube du IX e siecle, l'une des capitales ou s'etablit Jayavarman II, fondateur de la royaute angkorienne. D'autres sites archeologiques, de nature et de fonction differentes, ont revele une interpretation plus complete de l'occupation du massif, ne se developpant pas uniquement autour des temples de cette capitale. Cette these propose une premiere etude diachronique de l'occupation du massif, depuis les premiers sites fondes a la seconde moitie du VII e siecle jusqu'aux vestiges postangkoriens. Reprenant l'ensemble des elements epigraphiques et archeologiques issus d'un siecle de recherche, elle s'appuie sur la rea...
L'Autorite nationale Apsara et son unite d'archeologie preventive ont mis en oeuvre une p... more L'Autorite nationale Apsara et son unite d'archeologie preventive ont mis en oeuvre une politique de protection des ponts de pierre bâtis a l'epoque d'Angkor, afin que les travaux de modernisation des infrastructures ne les detruisent pas. Par Ros Borath et Jean-Baptiste Chevance.
Ecology and Evolution
This is an open access article under the terms of the Creative Commons Attribution License, which... more This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
PeerJ
This study develops a modelling framework by utilizing multi-sensor imagery for classifying diffe... more This study develops a modelling framework by utilizing multi-sensor imagery for classifying different forest and land use types in the Phnom Kulen National Park (PKNP) in Cambodia. Three remote sensing datasets (Landsat optical data, ALOS L-band data and LiDAR derived Canopy Height Model (CHM)) were used in conjunction with three different machine learning (ML) regression techniques (Support Vector Machines (SVM), Random Forests (RF) and Artificial Neural Networks (ANN)). These ML methods were implemented on (a) Landsat spectral data, (b) Landsat spectral band & ALOS backscatter data, and (c) Landsat spectral band, ALOS backscatter data, & LiDAR CHM data. The Landsat-ALOS combination produced more accurate classification results (95% overall accuracy with SVM) compared to Landsat-only bands for all ML models. Inclusion of LiDAR CHM (which is a proxy for vertical canopy heights) improved the overall accuracy to 98%. The research establishes that majority of PKNP is dominated by cashe...
Aséanie, 2014
J usqu'à une date récente, la cité de Mahendraparvata était essentiellement matérialisée par de n... more J usqu'à une date récente, la cité de Mahendraparvata était essentiellement matérialisée par de nombreux temples de briques, principalement découverts à partir de 1936 et attribués au règne de Jayavarman II. Le schéma des grands centres « urbains » angkoriens que l'on rencontre classiquement -temple-montagne, temples satellites, palais royal et baray -ne se retrouvait pas entièrement dans cette capitale supposée du Phnom Kulen. Seuls le temple-montagne, les temples disséminés sur la partie sud du plateau et quelques digues-barrages étaient répertoriés. Il manquait donc à l'ensemble de ces aménagements un complexe qui aurait pu concentrer un habitat séculier, éventuellement royal, et définir ainsi le palais associé à la ville de Mahendraparvata.
PLoS ONE, 2014
The Khmer kingdom, whose capital was at Angkor from the 9 th to the 14 th -15 th century, was fou... more The Khmer kingdom, whose capital was at Angkor from the 9 th to the 14 th -15 th century, was founded in 802 by king Jayavarman II in a city called Mahandraparvata, on Phnom Kulen. Virtually nothing more is known of Mahandraparvata from the epigraphic sources, but systematic archaeological survey and excavation have identified an array of cultural features that point to a more extensive and enduring settlement than the historical record indicates. Recent remote sensing data have revolutionized our view, revealing the remains of a city with a complex and spatially extensive network of urban infrastructure. Here, we present a record of vegetation change and soil erosion from within that urban network, dating from the 8 th century CE. Our findings indicate approximately 400 years of intensive land use, punctuated by discrete periods of intense erosion beginning in the mid 9 th century and ending in the late 11 th century. A marked change in water management practices is apparent from the 12 th century CE, with implications for water supply to Angkor itself. This is the first indication that settlement on Mahendraparvata was not only extensive, but also intensive and enduring, with a marked environmental impact.
Annals of Botany, 2010
† Background and Aims In spite of the abundance of archaeological, bio-archaeological, historical... more † Background and Aims In spite of the abundance of archaeological, bio-archaeological, historical and genetic data, the origins, historical biogeography, identity of ancient grapevine cultivars and mechanisms of domestication are still largely unknown. Here, analysis of variation in seed morphology aims to provide accurate criteria for the discrimination between wild grapes and modern cultivars and to understand changes in functional traits in relation to the domestication process. This approach is also used to quantify the phenotypic diversity in the wild and cultivated compartments and to provide a starting point for comparing well-preserved archaeological material, in order to elucidate the history of grapevine varieties. † Methods Geometrical analysis (elliptic Fourier transform method) was applied to grapevine seed outlines from modern wild individuals, cultivars and well-preserved archaeological material from southern France, dating back to the first to second centuries. † Key Results and Conclusions Significant relationships between seed shape and taxonomic status, geographical origin (country or region) of accessions and parentage of varieties are highlighted, as previously noted based on genetic approaches. The combination of the analysis of modern reference material and well-preserved archaeological seeds provides original data about the history of ancient cultivated forms, some of them morphologically close to the current 'Clairette' and 'Mondeuse blanche' cultivars. Archaeobiological records seem to confirm the complexity of human contact, exchanges and migrations which spread grapevine cultivation in Europe and in Mediterranean areas, and argue in favour of the existence of local domestication in the Languedoc (southern France) region during Antiquity.
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Papers by Jean-Baptiste Chevance