@PhDThesis{Ponzoni:1993:DeAsSp,
author = "Ponzoni, Fl{\'a}vio Jorge",
title = "Aplica{\c{c}}{\~a}o do modelo SAIL no estudo da
reflect{\^a}ncia espectral de doss{\'e}is de mudas de Eucalyptus
sp. e de Aspidosperma sp",
school = "Universidade Federal do Paran{\'a}",
year = "1993",
address = "Curitiba",
month = "1993-03-05",
keywords = "vegeta{\c{c}}{\~a}o, Len{\c{c}}{\'o}is Paulista (SP),
reflet{\^a}ncia espectral, Eucaliptos, Peroba, mudas, florestas,
SAIL.",
abstract = "O modelo SAIL ({"}Scattering by Arbitrarily Inclined Leaves{"})
foi aplicado ao estudo da reflect{\^a}ncia espectral de
doss{\'e}is constitu{\'{\i}}dos por mudas de Eucalyptus sp.
(Eucalipto) e de Aspidosperma sp.(Peroba) produzidas no viveiro de
mudas da DURAFLORA S/A, localizado no munic{\'{\i}}pio de
Len{\c{c}}{\'o}is Paulista SP. Foram elaborados tr{\^e}s
diferentes doss{\'e}is, sendo um constitu{\'{\i}}do por mudas
de Eucalipto, outro por mudas de Peroba e finalmente um terceiro
dossel constitu{\'{\i}}do por mudas de ambas as esp{\'e}cies na
propor{\c{c}}{\~a}o de 50% cada. Medi{\c{c}}{\~o}es
radiom{\'e}tricas foram realizadas em cada um destes doss{\'e}is
em diferentes hor{\'a}rios do dia, os quais caracterizaram
diferentes condi{\c{c}}{\~o}es de ilumina{\c{c}}{\~a}o. Nestas
medi{\c{c}}{\~o}es foram ainda considerados os {\^a}ngulos
zenitais de visada de 0°, 15° e 30° e o uso do radi{\^o}metro
SPECTRON SE-590 que atua dentro do intervalo espectral
compreendido entre 0,4 um {\`a} 0,9 um. Atrav{\'e}s destas
medi{\c{c}}{\~o}es radiom{\'e}tricas foram determinados os
Valores Medidos de Reflect{\^a}ncia (VMRs). Foram determinados os
par{\^a}metros biof{\'{\i}}sicos (IAF e DAF) destes
doss{\'e}is, os par{\^a}metros espectrais das folhas de ambas as
esp{\'e}cies e do solo e ainda os par{\^a}metros
geom{\'e}tricos de ilumina{\c{c}}{\~a}o. Estes par{\^a}metros
foram submetidos ao processamento do modelo SAIL para a
determina{\c{c}}{\~a}o dos Valores Calculados de
Reflect{\^a}ncia (VCRs). Estes VCRs foram ent{\~a}o comparados
com seus respectivos VMRs para a avalia{\c{c}}{\~a}o da
din{\^a}mica dos VMRs, em rela{\c{c}}{\~a}o {\`a}s
condi{\c{c}}{\~o}es de ilumina{\c{c}}{\~a}o e de visada
consideradas, e do desempenho do modelo. Verificou-se que com o
aumento do IAF, houve a diminui{\c{c}}{\~a}o dos VCRs na
regi{\~a}o do vis{\'{\i}}vel e seu aumento na regi{\~a}o do
infravermelho. Esta din{\^a}mica n{\~a}o foi t{\~a}o evidente
nos VMRs devido {\`a} influ{\^e}ncia de fatores como sombras (na
regi{\~a}o espectral do vis{\'{\i}}vel) e orvalho (na
regi{\~a}o espectral do infravermelho). A a{\c{c}}{\~a}o da DAF
sobre os VMRs deve ser analisada conjuntamente com a densidade do
dossel e com as geometrias de ilumina{\c{c}}{\~a}o e de visada.
Os par{\^a}metros espectrais das folhas (rho e tau) exerceram
influ{\^e}ncia sobre os VCRs. A an{\'a}lise da influ{\^e}ncia
dos par{\^a}metros geom{\'e}tricos da fonte e do sensor sobre os
VMRs deve levar em considera{\c{c}}{\~a}o a densidade do dossel,
a disposi{\c{c}}{\~a}o ou n{\~a}o das plantas em fileiras, bem
como a orienta{\c{c}}{\~a}o espacial destas fileiras. Para
doss{\'e}is densos e visada vertical, a diminui{\c{c}}{\~a}o do
valor do {\^a}ngulo zenital solar, acarretou o aumento dos VMRs,
principalmente na regi{\~a}o do vis{\'{\i}}vel. Na regi{\~a}o
do infravermelho a comprova{\c{c}}{\~a}o deste efeito foi
prejudicada pela presen{\c{c}}a do orvalho e de sua
evapora{\c{c}}{\~a}o coincidente com a diminui{\c{c}}{\~a}o do
{\^a}ngulo zenital solar. Para doss{\'e}is menos densos a
plantas dispostas em fileiras, o aumento dos VMRs na regi{\~a}o
do vis{\'{\i}}vel com a diminui{\c{c}}{\~a}o do {\^a}ngulo
zenital solar foi atribu{\'{\i}}do {\`a} diminui{\c{c}}{\~a}o
do sombreamento m{\'u}tuo das plantas e do solo. Na regi{\~a}o
do infravermelho, houve tamb{\'e}m o aumento dos VMRs com a
diminui{\c{c}}{\~a}o do {\^a}ngulo zenital solar. O efeito do
{\^a}ngulo zenital de visada sobre os VMRs deve ser analisado
conjuntamente com o valor do azimute relativo (psi). As
diferen{\c{c}}as entre os VMRs e seus respectivos VCRs foram
frequentemente superiores {\`a} 10%.Foi ainda viabilizado o
procedimento de invers{\~a}o do modelo visando a estimativa do
IAF, sem a obten{\c{c}}{\~a}o de resultados satisfat{\'o}rios.
ABSTRACT: A canopy reflectance model called Scattering by
Arbitrarily Inclined Leaves (SAIL) was applied to a spectral
reflectance study of Eucalyptus sp. (Eucalipto) and Aspidosperma
sp. (Peroba) seedling canopies, which have been cultivated in a
forestry nursery of DURAFLORA S/A, located in Len{\c{c}}{\'o}is
Paulista (SP) town. Three different canopies were studied. The
first one was composed by Eucalipto seedlings, the second one by
Peroba seedlings and the third one was composed by seedlings of
these two species (50% of each one). Radiometric measurements were
carried out considering different times of day, exploring several
illumination conditions. The view zenith angle was also changed
during these measurements. It was used the SPECTRON SE-590
radiometer with the spectral range from 0.4 um to 0.9 um. Through
these radiometric data the Observed Reflectance Value (VMRs) were
determined. The biophysical parameters (IAF and DAF), the leaves
and soil spectral properties and the illumination/ view geometry
were used in the model processing in order to determine the
Calculated Reflectance Values (VCRs). These VCRs were compared
with the VMRs to evaluate the canopy reflectance dynamic and the
model performances. The increase in IAF caused a decrease in the
VCRs in visible region and a VCRs increase in infrared region.
That dynamic was not so easily observed in the VMRs due shadow (in
the visible region) and dew (infrared spectral range) influence.
The DAF influence has to be analised considering both canopy
density and illumination/view geometry. The leaves spectral
parameters (rho and tau) were the most VCRs influential. The
analysis of the influence of source and sensor geometric
parameters in the VMRs has to consider the canopy density and the
row orientation. Considering compact canopies and vertical view,
as sun zenith angle decreased, the VMRs increased, mainly in the
visible region. In infrared region this dynamic was not confirmed
due dew and its evaporation during the day. For sparse canopies
and plants oriented by rows, the increase of VMRs, in the visible
region, with the decrease of zenith solar angle was attributed to
plants and soil shadowing decrease. In infrared region, the VMRs
increased as sun zenith angle decreased. The view zenith angle
effect must be analised considering the related azimuth angle
(psi) values. Differences between VMRs and VCRs were frequently
greater than 10%. A model invertion procedure was developed in
order to estimate IAF values, but with not sucessfull results.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
committee = "Disperati, Attilio Antonio (presidente/orientador) and Formaggio,
Antonio Roberto and Garcia, Gilberto Jos{\'e} and Aspiaz{\'u},
Celestino and Dalmolin, Quintino",
copyholder = "SID/SCD",
englishtitle = "Application of the SAIL model on the study of spectral reflectance
canopies of Eucalyptus sp. seedlings and Aspidosperma sp.",
label = "6626",
language = "pt",
pages = "206",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}