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Combining optical and radar satellite image time series to map natural vegetation: savannas as an example / Maylis Lopes in Remote sensing in ecology and conservation, vol 6 n° 3 (September 2020)  

Public [article]  inRemote sensing in ecology and conservation > vol 6 n° 3 (September 2020) . - pp 316 - 326 Titre : Combining optical and radar satellite image time series to map natural vegetation: savannas as an example Type de document : Article/Communication Auteurs : Maylis Lopes, Auteur ; Pierre-Louis Frison , Auteur ; Sarah Durante, Auteur ; Henrike Schulte To Bühne, Auteur ; Audrey Ipavec, Auteur ; Vincent Lapeyre, Auteur ; Nathalie Pettorelli, Auteur Année de publication : 2020 Article en page(s) : pp 316 - 326 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] aire protégée [Termes IGN] Bénin [Termes IGN] carte d'occupation du sol [Termes IGN] carte de la végétation [Termes IGN] écosystème [Termes IGN] image Sentinel-MSI [Termes IGN] image Sentinel-SAR [Termes IGN] protection de l'environnement [Termes IGN] protection de la biodiversité [Termes IGN] savane [Termes IGN] série temporelle Résumé : (auteur) Up-to-date land cover maps are important for biodiversity monitoring as they are central to habitat and ecosystem distribution assessments. Satellite remote sensing is a key technology for generating these maps. Until recently, land cover mapping has been limited to static approaches, which have primarily led to the production of either global maps at coarse spatial resolutions or geographically restricted maps at high spatial resolutions. The recent availability of optical (Sentinel-2) and radar (Sentinel-1) satellite image time series (SITS) which provide access to high spatial and very high temporal resolutions, is a game changer, offering opportunities to map land cover using both temporal and spatial information. These data moreover open interesting perspectives for land cover mapping based on data combination approach. However, the usefulness of combining dense time series (more than 30 images per year) and data combination approaches to map natural vegetation has so far not been assessed. To address this gap, this contribution tests the idea that the combined consideration of optical and radar data combination and time series analyses can significantly improve natural vegetation mapping in the Pendjari National Park, a Sahelian savanna protected area in Benin. Results highlight that the combination of Sentinel-1 and Sentinel-2 SITS performs as well as Sentinel-2 SITS alone in terms of classification accuracy. Land cover maps are however qualitatively better when considering the data combination approach. Our results also clearly show that the use of dense/hypertemporal optical time series significantly improves classification outcomes compared to using multitemporal only a few images per year) or monotemporal data. Altogether, this work thus demonstrates the ability of dense SITS to improve discrimination of natural vegetation types using information on their phenology, leading to more detailed and more reliable maps for environmental management. Numéro de notice : A2020-871 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : BIODIVERSITE/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/rse2.139 Date de publication en ligne : 17/01/2020 En ligne : https://doi.org/10.1002/rse2.139 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99584 [article]

See where we’re up to / Sarah Durante in GEO: Geoconnexion international, vol 14 n° 10 (November 2015)

Public [article]  inGEO: Geoconnexion international > vol 14 n° 10 (November 2015) . - pp 22 - 24 Titre : See where we’re up to Type de document : Article/Communication Auteurs : Sarah Durante, Auteur Année de publication : 2015 Article en page(s) : pp 22 - 24 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] information géographique [Termes IGN] positionnement automatique Résumé : (éditeur) Improvements in hardware mean that augmented reality technology can now potentially be used in many more applications. However, in many cases, enterprises will need to achieve far greater positional accuracy before they can adopt it, says Sarah Durante. Numéro de notice : A2015-658 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78263 [article]