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Gembloux Agro-Bio Tech (GxABT)
Gembloux Agro-Bio Tech (GxABT)
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Modeling crop growth using multisensor analysis in remote sensing

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Bataille, Laurent ULiège
Promotor(s) : Meersmans, Jeroen ULiège ; Heidarian Dehkordi, Ramin ULiège
Date of defense : 23-Aug-2021 • Permalink : http://hdl.handle.net/2268.2/13176
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Title : Modeling crop growth using multisensor analysis in remote sensing
Author : Bataille, Laurent ULiège
Date of defense  : 23-Aug-2021
Advisor(s) : Meersmans, Jeroen ULiège
Heidarian Dehkordi, Ramin ULiège
Committee's member(s) : Wellens, Joost ULiège
Charles, Catherine ULiège
Bastin, Jean-François ULiège
Language : English
Number of pages : 88
Keywords : [en] Winter wheat
[en] crop growth
[en] Aquacrop
[en] SNAP
[en] remote sensing
[en] unmanned aerial vehicle UAV
[en] FCOVER
[en] FVC
[en] Belgium
[en] Yield
[en] historical kilns
[en] biochar
Discipline(s) : Life sciences > Environmental sciences & ecology
Complementary URL : https://github.com/lbataille/lbataille.github.io.git
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en bioingénieur : sciences et technologies de l'environnement, à finalité spécialisée
Faculty: Master thesis of the Gembloux Agro-Bio Tech (GxABT)

Abstract

[fr] These last years, the use of spaceborne remote sensing and unmanned aerial vehicles (UAV)
has grown exponentially in agronomy. Their abilities are theoretically complementary in terms of
temporal coverage and spatial resolution. Thiswork aims to compare both approaches at the scale
of a winter wheat experimental parcel during a complete growing season using green fractional
cover time-series (FCOVER) and combine them to improve crop growth characterization. UAV
multibands images and Sentinel2 images are analyzed on the same time interval. Eventually, the
influence of landscape elements on crop growth-related variables is studied. The methodological
results of this study are the processes used to transpose FCOVER time-series into a reduced
amount of crop growth parameters and quantify their uncertainties. These parameters allow predicting
yield using the Aquacrop Model and finally summarizing this information on a set of
maps. A comparison between yield predictions to a reference yield map based on field measurement
shows that yield prediction using S2 (resp.UAV) FCOVER tends to underestimate (resp.
overestimate), while data combination tends to be closer to reference values.UAV provides earlier
and faster growth curves, reaching higher maxima. Growth process variables are compared to covariables
describing topography, the presence of historical charcoal kilns, and the ploughing date.
South facing half of the parcel experiences faster growth and higher yield; an earlier ploughing
date and biochar patches emphasize this trend.


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