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September 2009 - December 2015
Publications
Publications (48)
The correction of the atmospheric effects on optical satellite images is essential for quantitative and multi-temporal remote sensing applications. In order to study the performance of the state-of-the-art methods in an integrated way, a voluntary and open-access benchmark Atmospheric Correction Inter-comparison eXercise (ACIX) was initiated in 201...
Presentation of a method based on physical models to dehaze satellite images
The correction of the atmospheric effects on optical satellite images is essential for quantitative remote sensing applications. Open and free data access to Copernicus Sentinel-2 (EC/ESA) and Landsat 8 (NASA/USGS) missions increased significantly the scientific interest on atmospheric correction (AC) and several approaches have been introduced by...
Description of the method and implementation to perform automated compositing of Sentinel-2 image, providing cloud-free regular time series of corrected reflectance and vegetation maps
Application of Airbus DS satellite image dehazing algorithms to new launched Pleiades Neo system
Precise accounting of carbon stocks and fluxes in tropical vegetation using remote sensing approaches remains a challenging exercise, as both signal saturation and ground sampling limitations contribute to inaccurate extrapolations. Airborne LiDAR Scanning (ALS) data can be used as an intermediate level to radically increase sampling and enhance mo...
Presentation of the VERDE service providing time series of LAI and Chlorophyll maps over field plots from multiple optical satellites.
Presentation of the methodology to process the whole time series of Landsat and Sentinel-2 images in tropical forest regions to identify changes of Land Use / Land Cover and produce yearly LULC classification maps
Maps of farmlands and Farmstar’s services
Farmstar, an innovative service unique in the world, processes satellite images and runs agronomic models in order to assist farmers in making decisions about fertilizer inputs. Its success – more than 16,000 subscribing farmers who work more than 700,000 hectares – can be set down to the accuracy of its in...
Among grapevine diseases affecting European vineyards, Flavescence dorée (FD) and Grapevine Trunk Diseases (GTD) are considered the most relevant challenges for viticulture because of the damage they cause to vineyards. Unmanned Aerial Vehicle (UAV) multispectral imagery could be a powerful tool for the automatic detection of symptomatic vines. How...
Presentation of methodology and first tests to generate global Land products such as fCover, FAPAR and LAI from Sentinel-3 OLCI data
Flavescence doree is a grapevine disease affecting European vineyards which has severe economic consequences and containing its spread is therefore considered as a major challenge for viticulture. Flavescence doree is subject to mandatory pest control including removal of the infected vines and, in this context, automatic detection of Flavescence d...
Presentation of validation results obtained on biophysical maps produced from Sentinel-2 images, within the frame of the Farmstar campaign
To mitigate impacts of climate-related reduced productivity of French grasslands, a new insurance scheme bases indemnity payouts to farmers on a Moderate Resolution Imaging Spectroradiometer (MODIS)-derived forage production index (FPI). The objective of this study is to compare several approaches for deriving FPI from satellite data to assess whet...
An index-based insurance solution was developed to estimate and monitor near real-time forage production using the indicator Forage Production Index (FPI) as a surrogate of the grassland production. The FPI corresponds to the integral of the fraction of green vegetation cover derived from moderate spatial resolution time series images and was calcu...
An index-based insurance is being developed to estimate and monitor forage production in France in near real-time based on a forage production index (FPI) derived from the fraction of green vegetation cover (fCover) integral, obtained from medium spatial resolution time series. This article presents the first step of the scientific validation imple...
The full report is available at
http://www.observatoire-comifac.net/edf2013.php?l=en
The full report is available in French at
http://www.observatoire-comifac.net/edf2013.php?l=fr
and in English at
http://www.observatoire-comifac.net/edf2013.php?l=en
In many countries, sprawling of urban areas is a major concern and participates to the global Climate Change issue. In old industrial nations, this often results in loss of good agricultural land; in the developing world, this is the sign of widely uncontrolled movements of population attracted by major cities, increasing environmental problems. Th...
Oenoview® was born in 2006 from the partnership between the GEO-Information division of Astrium Services - specialized in earth observation - and the Institut Coopératif du Vin (ICV), a French wine and vine services company. Oenoview® is an operating precision viticulture service, dedicated to vine monitoring, harvest optimisation and input managem...
Since 2003, Astrium has worked on the development of a biophysical processing line from the MERIS data, and the exploitation of the generated biophysical parameters within EO regional applications for Agriculture and Environment.
The processing line builds up on the Overland biophysical processing suite that integrates state-of-the-art models such...
Sentinel-2 (S-2) data, to be available in early 2014, are eagerly expected by Service Providers, such as Astrium Services, for significantly enhancing their capacity in the provision of geographical information for agriculture and environment applications. Indeed the unequalled coverage, revisit capacity and the spectral capabilities of S-2 will pr...
The effect of canopy architecture in the estimation of biophysical parameters from remote sensing data in orchards is studied through the particular case of vineyard canopies. Two different approximations (1D and 3D models) are tested to estimate Leaf Area Index (LAI) from canopy reflectance in a total of 31 points within commercial field plots. Th...
The European GMES initiative provides a political framework for future implementations of Services Centres related to environmental applications. The FP7/geoland2 project is the last brick towards the implementation of fully mature GMES Land Services, consisting of Core Mapping Services (CMS) and Core Information Services (CIS). Its goal is to buil...
The European GMES initiative provides a political framework for future implementation of Service Centres related to environmental applications. The FP7/geoland2 project is the last brick towards the implementation of fully mature GMES Land Services, consisting of Core Mapping Services (CMS) and Core Information Services (CIS). Its goal is to build,...
Ten years after the introduction of zone-based management to take into account within-field phenomena in agronomic practices,
several methodological developments have progressed to the operational level. However, this raises a new scientific question:
how can the relevance of this type of management be evaluated? This paper adapts the concept of a...
An assessment of the organic carbon stock present in living or dead vegetation and in the soil on the 450 km2 of the future Nam Theun 2 hydroelectric reservoir in Lao People's Democratic Republic was made. Nine land cover types were defined on the studied area: dense, medium, light, degraded, and riparian forests; agricultural soil; swamps; water;...
Within the frame of geoland2 BioPar Core Mapping Service, a comprehensive set of biophysical products with a spatial resolution of 300 m is to be generated from MERIS data on a routine basis, every 10 days for the whole Europe continent, and made available to the User in near-real time.
This document is the Method Compendium of these BioPar MERIS p...
Presentation of the methodology based on the Overland tool to automatically generate the NDFI indicator (GOFC-GOLD source book, Carlos Souza) and to perform computer-aided classification to map deforestation and forest degradation. Application to the monitoring of Mato Grosso over the historical series of Landsat images (1984-2009, 650 images proce...
The scope of this paper is to demonstrate, evaluate and compare two burn scar mapping (BSM) approaches developed and applied operationally in the framework of the RISK-EOS service element project within the Global Monitoring for Environment and Security (GMES) program funded by ESA (http://www.risk-eos.com). The first method is the BSM_NOA, a fixed...
Site-specific management (SSM) is a common way to manage within-field variability. This concept divides fields into site-specific
management zones (SSMZ) according to one or several soil or crop characteristics. This paper proposes an original methodology
for SSMZ delineation which is able to manage different kinds of crop and/or soil images using...
Site-specific management (SSM) is a common way to manage within-field variability. This concept divides fields into site-specific management zones (SSMZ) according to one or several soil or crop characteristics. This paper proposes a new approach for SSMZ delineation, able to manage different kinds of crop and/or soil images using a powerful segmen...
EADS-astrium has been collaborating with French agronomic institutes, ARVALIS-Institut du
Végétal and CETIOM, for many years to develop Farmstar, a commercial remote sensing service
using space-based remote sensing and airborne images. It includes a full range of products,
delivered on a field basis through the growing season, to answer farmers’ in...
Leaf area index (LAI) is a key variable for the understanding of several eco-physiological processes within a vegetation canopy. The LAI could thus provide vital information for the management of the environment and agricultural practices when estimated continuously over time and space thanks to remote sensing sensors.
This study proposed a method...
Land cover classification requires both temporal and spatial information. Indeed, vegetation temporal evolution is necessary to discriminate the different land cover types. This information can be derived from coarse resolution sensors such as MERIS (300◊300m2 pixel size), or SPOT/VGT (1km2 pixel size), whereas high resolution images, such as SPOT4...
The European GMES (Global Monitoring for Environment and Security)
initiative is in a preparatory phase before starting the implementation
of its Earth Observation component. The GMES applications served by
current multispectral sensors are mainly related to land cover and
vegetation monitoring. There is now an identified need of continuity for
the...
Four one-dimensional radiative transfer models are compared in direct and inverse modes. These models are combinations of the PROSPECT leaf optical properties model and the SAIL (Scattering by Arbitrarily Inclined Leaves), IAPI, KUUSK, and NADI (New Advanced Discrete Model) canopy reflectance models. To evaluate their ability to estimate canopy bio...
In an attempt to extract information relevant for agriculture in remotely sensed wheat crops, MIVIS hyperspectral images are analyzed in the visible and near-infrared domains. Through the selection, by means of a principal component analysis (PCA), of two endmembers of wheat, related respectively to well-developed and stressed plants, a water defic...
In this paper, we discuss straight line extraction as a part of the image interpretation process. Favoring the use of line drawings as intermediate data for the extraction, we survey the current methods, which all achieve a polygonal approximation of lines, and show that they are not appropriate for the identification of straight elements in a scen...
The paper presents work being done on a 6 degrees of freedom structure in the field of hybrid position/force control. The algorithms implemented on the control processor ensure simultaneous real time force control in any subspace and position control in the orthogonal one of any Cartesian space. The first mechanical structure being controlled is an...
Résumé Quatre modèles de transfert radiatif sont comparés en modes direct et inverse. Ces modèles sont des couplages du modèle de propriétés optiques des feuilles PROSPECT et des modèles de réflectance des couverts végétaux SAIL, IAPI, KUUSK et NADI. Les valeurs de réflectance spectrale et directionnelle simulées montrent une bonne cohérence entre...
