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Modellering av reflektans från ett sockerbetsbestånd med hjälp av en strålningsmodell

Berntsson, Anna (2001) In Lunds universitets Naturgeografiska institution - Seminarieuppsatser
Dept of Physical Geography and Ecosystem Science
Abstract (Swedish)
En Multispectral Canopy Reflectance Modell (MCRM) av Kuusk (1995) har använts för att simulera reflektansen i ett sockerbetsbestånd. De simulerade reflektansvärdena visade på hög absorbans i VIS-området, jämfört med mätningar i fält, och höga reflektansvärden i NIR-området. En "vårmodell" utfördes, och jämfördes med originalsimuleringen. Denna gav mer korrekta reflektansvärden.
Abstract
The Multispectral Canopy Reflectance Model (MCRM) by Kuusk (1995) has been
used to simulate the reflectance of a sugarbeet canopy. The simulated reflectance
values show high absorptance in the VIS area, compared to field measurements, and
high reflectance values in the NIR area. The errors may be due to overestimation of
clorophyll content in the sugarbeet leaves and scattered light during field
measurements. The estimation of the clorophyll content where carried out using the
PROSPECT-model by Jacquemoud & Baret (1990).
During the vegetation period, the state of the canopy moves towards a closed canopy,
with sparse vegetation in spring. The MCRM-model was used to perform a “spring”
simulation, which was compared to the original... (More)
The Multispectral Canopy Reflectance Model (MCRM) by Kuusk (1995) has been
used to simulate the reflectance of a sugarbeet canopy. The simulated reflectance
values show high absorptance in the VIS area, compared to field measurements, and
high reflectance values in the NIR area. The errors may be due to overestimation of
clorophyll content in the sugarbeet leaves and scattered light during field
measurements. The estimation of the clorophyll content where carried out using the
PROSPECT-model by Jacquemoud & Baret (1990).
During the vegetation period, the state of the canopy moves towards a closed canopy,
with sparse vegetation in spring. The MCRM-model was used to perform a “spring”
simulation, which was compared to the original simulation. It accurately described
the differences in reflectance between the dense and sparse canopies. The
background, i.e. the soil, has larger influence on the canopy reflectance when the
canopy is sparse, while the influence from LAI and clorophyll lessens. The sensitivity
of the model changes with the canopy characteristics. In a closed or dense canopy,
the leaves completely cover the ground and the sensitivity for leaf properties are high.
The sensitivity patterns for a sparse canopy shows a larger sensitivity to soil
properties and lesser sensitivity to leaf properties. (Less)
Please use this url to cite or link to this publication:
author
Berntsson, Anna
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
chlorophyll, Canopy characteristics, mapping, physical geography, leaf area index, modelling, remote sensing, geomorphology, klimatologi, marklära, naturgeografi, geomorfologi, pedology, climatology, cartography, kartografi
publication/series
Lunds universitets Naturgeografiska institution - Seminarieuppsatser
report number
83
language
Swedish
id
1332920
date added to LUP
2005-10-26
date last changed
2011-12-05 12:28:39
@misc{1332920,
  abstract     = {The Multispectral Canopy Reflectance Model (MCRM) by Kuusk (1995) has been
used to simulate the reflectance of a sugarbeet canopy. The simulated reflectance
values show high absorptance in the VIS area, compared to field measurements, and
high reflectance values in the NIR area. The errors may be due to overestimation of
clorophyll content in the sugarbeet leaves and scattered light during field
measurements. The estimation of the clorophyll content where carried out using the
PROSPECT-model by Jacquemoud & Baret (1990).
During the vegetation period, the state of the canopy moves towards a closed canopy,
with sparse vegetation in spring. The MCRM-model was used to perform a “spring”
simulation, which was compared to the original simulation. It accurately described
the differences in reflectance between the dense and sparse canopies. The
background, i.e. the soil, has larger influence on the canopy reflectance when the
canopy is sparse, while the influence from LAI and clorophyll lessens. The sensitivity
of the model changes with the canopy characteristics. In a closed or dense canopy,
the leaves completely cover the ground and the sensitivity for leaf properties are high.
The sensitivity patterns for a sparse canopy shows a larger sensitivity to soil
properties and lesser sensitivity to leaf properties.},
  author       = {Berntsson, Anna},
  keyword      = {chlorophyll,Canopy characteristics,mapping,physical geography,leaf area index,modelling,remote sensing,geomorphology,klimatologi,marklära,naturgeografi,geomorfologi,pedology,climatology,cartography,kartografi},
  language     = {swe},
  note         = {Student Paper},
  series       = {Lunds universitets Naturgeografiska institution - Seminarieuppsatser},
  title        = {Modellering av reflektans från ett sockerbetsbestånd med hjälp av en strålningsmodell},
  year         = {2001},
}