F. Blasco's research while affiliated with Paul Sabatier University - Toulouse III and other places

Publications (44)

Article
A vegetation map at scale 1:5 million is presented.† It covers Bangladesh, Burma (Myanmar), India, Cambodia, Laos, Thailand, Vietnam and Sri Lanka and fills a conspicuous gap in the cartography of tropical vegetation, following the publication of vegetation maps of South America, Africa and Malaysia. For conformity, it is presented as one sheet at...
Article
Full-text available
GAMBAS est un programme de la Commission Européenne de recherche sur le développement durable de l'aquaculture dans le delta du Mékong. La pluridisciplinarité des équipes impliquées dans ce programme a permis de cerner précisément l'impact de l'aquaculture sur l'écosystème « mangrove ». Dans cette action, la télédétection a joué un rôle fédérateur...
Article
Full-text available
L'ambroisie, Ambrosia artemisiifolia, est une plante annuelle responsable d'allergies respiratoires dues à son pollen. Dans certains secteurs du département du Rhône, jusqu'à 20% de la population a été atteinte d'allergie respiratoire en 2005. Ce problème majeur de santé touche actuellement six des huit départements de la Région Rhône‐Alpes (Ain, A...
Article
Characteristics of mangrove communities along the Gulf Coast of the UAE were explored using high-resolution satellite data Terra ASTER imageries in the common visible and near infra-red bands. Mangrove stands in three geographically distinctive sites, Khor Kalba, Khor Umm Al-Quwain and Al Dabbiya, were studied through spatial data and ground verifi...
Article
Soumis le 25 juillet 2005 ; révisé le 21 décembre 2005 ; accepté le 4 mai 2006 La régression accélérée des forêts denses humides de Côte d'Ivoire a été signalée par de nombreux auteurs, y compris dans la zone soudanienne. Les outils spatiaux confirment de fortes pressions anthropiques, même dans les aires protégées. Dans cette étude, nous avons uti...
Article
Full-text available
This study is an attempt to produce an assessment of the impact of shrimp aquaculture in the Mekong Delta (Viet Nam) on mangrove ecosystems. For this exercise we selected two sub-areas (Ca Mau and Tra Vinh provinces) encompassing a variety of land uses and ecological conditions. Twenty stations in Tra Vinh and 15 stations in Ca Mau have been survey...
Conference Paper
This is the first attempt to use very high spatial resolution satellite sensor data (IKONOS) on Greek landscapes. The IKONOS imagery analysed in this study covers a hilly area close to Corinth Gulf, behind an industrial harbor. The processing seeks to retrieve the main units of a Mediterranean, more or less degraded or preserved, vegetation. The va...
Article
Mangroves reach their optimal development in the wet tropics although some little known mangrove stands are reported in subtropical arid coastlines especially from the Red Sea to Pakistan where they form one of the driest mangrove habitats in the world. Because they constitute the only available evergreen forest in hyper-arid warm coastal areas, th...
Article
soumis le 29 janvier 2003 ; révisé le 20 mars 2003 ; accepté le 8 juillet 2003) * Correspondant principal Une étude basée sur l'analyse des données satellitaires multidates et multisbandeses a été réalisée en vue d'évaluer la dynamique de En Côte d'Ivoire, les chiffres officiels de la déforestation annuelle varient de 200 000 à 300 000 ha par an. T...
Article
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Ce numéro de la revue « Télédétection » est une sélection de travaux qui ont fait l'objet d'exposés oraux ou d'affiches lors des IX e Journées scientifiques du Réseau Télédétection de l'Agence universitaire de la Francophonie, du 29 novembre au 2 décembre 2001, à Yaoundé au Cameroun. Ces Journées scientifiques se sont déroulées sous la responsabili...
Article
La détection des champs comportant des populations denses d'ambroisie (Ambrosia artemisiifolia L.) par des méthodes spatiales pourrait être possible. Cette détection qui conduirait à une cartographie des parcelles « infestées » constituerait une aide précieuse pour engager des campagnes de désherbage et apprécier l'évolution spatiotemporelle de la...
Article
The detection of dense populations of ragweed (Ambrosia artemisiifolia L.) using spatial remote sensing methods seems possible. A sufficiently accurate map of parcels of land infested with ragweed could offer new possibilities to engage in weeding campaigns and to appreciate the space-time evolution of this plant. Obviously, the main difficulties i...
Article
Due to the El Niño phenomenon, the 1997-1998 dry season in Roraima (Brazil, Amazonia) was particularly pronounced. Consequently, vegetation fires spread widely and were monitored by many satellites in real time. Satellite images are currently being used to monitor vegetation fires either globally for climate studies or more regionally for impact as...
Article
With the help of high resolution satellite data (SPOT products), it has been possible to portray on maps the present distribution of main mangrove types and sub-types of the Bay of Bengal coastline. New figures have been given for the mangroves of each concerned country especially for Myanmar. The present ecological status of mangrove ecosystems in...
Article
Full-text available
Résumé La détection des champs comportant des populations denses d'ambroisie (Ambrosia artemisiifolia L.) par des méthodes spatiales pourrait être possible. Cette détection qui conduirait à une cartographie des parcelles « infestées » constituerait une aide précieuse pour engager des campagnes de désherbage et apprécier l'évolution spatiotemporelle...
Article
Full-text available
The mangroves located around the Bay of Bengal and along the coast ofSouth China Sea are of special interest for many reasons. This coastlinereceives three major tropical rivers (Ganges, Irrawaddy, Mekong) and it hasthe world's largest mangrove stands in a single block (the Sunderbans). Thecontrasted climatic conditions from sub-arid (southeastern...
Article
A simple, flexible, pantropical forest classification framework is proposed to provide a common platform for foresters, vegetation mappers, climatic modellers, biogeographers and plant ecologists. The framework is provided by bioclimatic types, defined on annual rainfall, seasonality and mean temperature of the coldest month. Within each bioclimati...
Article
Scattered populations of Avicennia marina can be found in the Arabian Gulf, occupying one of the driest mangrove habitats in the world, in which salt concentrations may reach levels that are beyond the physiological limit for other species. These ecosystems are poorly known, in particular, what levels of productivity can be attained and whether the...
Article
Despite their environmental and economic significance the exact status and geographical extent of mangrove ecosystems are unknown in Madagascar. For the first time, the deltaic complex of Mahajamba bay has been surveyed, using SPOT 1 and SPOT 2 imagery. An intensive field survey together with complete aerial coverage at a scale of 1 :40 000 were us...
Article
Current knowledge of intraspecific variation of mangrove species is limited in terms of rangewide distributions and is mostly restricted to morphological analyses, which have indicated a high degree of homogeneity. However, our analyses of the aliphatic hydrocarbon and triterpenoid fraction of foliar waxes (by gas chromatography and mass spectrosco...
Article
This paper summarizes present capabilities in studying mangrove vegetation from space. There is no standard image processing method that can be applied for the identification and delineation of coastal ecosystems. From a spectral point of view, it is practically impossible to characterize each of the sixty species of trees and shrubs that constitut...
Article
The present study relates to the discrimination of opium poppy fields in northern Thailand using Landsat TM multispectral imageries. In several countries in Asia, a high priority is given to drug control policies and to the eradication of opium poppy cultivation. This is the case in Thailand, where the government is engaged in a permanent inventory...
Article
The ecological status of the mangroves of India is extremely complex due to the diversity of coastal bioclimatic, geological and sociological conditions (5,686 km of coast line). Nevertheless an attempt to produce a preliminary classification of the mangroves of India (about 3000 km2 of woody types) has been carried out in this paper. It is based o...
Article
Full-text available
In view of the unique biological characteristics of mangroves, it is interesting to assess the extent to which these ecosystems can be used as indicators of coastal change or sea-level rise. From recent studies of mangrove mortality at several locations (including Guiana, Gambia, Côte d'Ivoire, Kenya, India and Bangladesh), it appears that these co...
Article
Foliage from 21 red mangroves (Rhizophora mangle, R. racemosa and R. x harrisonii) from different ecogeographic conditions in Gabon, West Africa, was analyzed for epicuticular wax composition using CC, GC and GC-MS. Aliphatic hydrocarbons ranging from C23 to C34 and some triterpenoids were identified. Alkanes were the major constituents (46.7–99.9%...
Article
The passive and active microwave region remote detection sensors are not affected by fog or cloud and are advantageous in studying the vertical component of the vegetation, through the penetration power of certain wavelengths. The high-resolution sensors are capable of far greater use than at present: the use of radiometric data is still in its inf...

Citations

... This is not always the case. In addition, in space remote sensing, vegetation mapping is based on the ability to recognize plant formations based on their radiometric characteristics according to classification criteria [32]. Therefore, the choice of classification method is very important. ...
... Most of the economically recoverable coastal zone resources worldwide are sand and gravel deposits (Osterkamp and Morton 2005). The principal uses of beach sand and gravel include aggregate in cement and asphalt for construction, road base, earth fill, and a variety of industrial products (Osterkamp and Morton 2005), along with gravel for drainage trenches. ...
... In Bangladesh about two-thirds of the total land is classified as wetlands (Nanda et al., 2015) which have been estimated at 7 to 8 million hectares (Rahman et al., 2001). Wetland includes world heritage sites with paramount values to hydrological, ecological, biological, zoological or limnological settings (Haque and Basak, 2017;Blasco and Aizpuru, 1997). Almost 461 different kinds of wetlands are available in Bangladesh (Chakraborty, 2005). ...
... Shown faction of the Estuarine and Marine Wetland (simulated at one-meter resolution) that remains unmixed as a function of pixel size. but the majority of applications have been limited to mapping areal extent and patterns of change (Alongi, 2002;Blasco, Aizpuru, & Din Ndongo, 2005;Heumann, 2011). ...
... Besides Hungary, which seems to be the most exposed country in Europe, it is also important elsewhere. For example in Switzerland up to 12% of the population suffers from allergies to the ragweed pollen [7], while 20% of the population in the region of Rhone in France suffers from ragweed pollen allergy [5]. On the other hand, although it is considered to be a native species, 10% of the United States population is also estimated as ragweed sensitive [8]. ...
... Coastline change is the principal content of coastal morphodynamic study. Evidence of coastline changes can be obtained from comparisons of historical maps, charts, aero photos, and satellite images (Bird 2005;Fan 2012; and references therein). Historical maps and charts may have implemented different coordinate systems when they were produced, so they should be registered into the same coordinate system before carrying out overlaying comparison studies of different-aged coastline positions. ...
... Twenty nine villages have been lost along the Yorkshire coast of UK during the 20th century; in the USA, barrier island communities have suffered a similar fate, e.g. Broadwater, Hog Island, VA in 1933 (Neal et al., 2005). In 2002, 151 coastal sites in England and Wales were listed by DEFRA and EA (2002), where defence line retreat has been adopted as a strategy for coastal protection. ...
... The deep sea seems to be such a sink for plastics (Courtene-Jones et al., 2017;Naranjo-Elizondo and Cortés, 2018;Peng et al., 2020;Van den Beld et al., 2017;Williams et al., 2005;Woodall et al., 2014). Several mechanisms have been identified by which plastics might reach the deep ocean floor. ...
... uaculture pond dynamics in the Pambala-Chilaw lagoon of Sri Lanka. The Maldives has no such studies to date. However,Constance et al. (2021) lately studied the wave exposure on the atoll mangroves of Seychelles.Clarisse et al. (2016) distinguished the spatial distribution of Bruguiera gymnorrhiza and Rhizophora mucronata in the Mauritian mangroves.Rasolofoharinoro et al. (1998) studied the mangrove forest dynamics, whereasGiri and Muhlhausen (2008) focused on the temporal change in Madagascar. Like the Maldives, Comoros also has no record of such studies. ...