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Retrieval model of infrared surface emissary based on NOAA satellite data

ACRS 1999

Poster Session 1

Retrieval Model of Infrared Surface Emissity Based On
NOAA Satellite Data

Fang Yonghua and Xun Yulong
Anhui Institute of Optics & Fine Mechanics
Hefei, Anhui, 230031, China
Changchun Institute of Optics & Fine Mechanics
Changchun, Jilin, 130022, China
E-mail: [email protected]

Abstract
In this paper, we accomplish
research on retrieval model of surface
emissivity. We establish appropriate
calculation model and method based
NOAA satellite data to acquire actual
thermal radiation characteristic of any
area in real time.

Introduction
The infrared emissity of surface is
an important parameter that describng
the interaction of earth’s surface with
atmosphere in research on thermal
radiation characteristic of earth’s surface.
Nowadays, they’re two kinds of
elementary research approachs: the first
method is based on groundwork
observation, establishing model with
direct measure and long-term statistic.
This method is direct and reliable but
troublesome. The second method is to
adopt satellite data. Remote sensing
image data in thermal infrared band is
primary research area (such as channel 4
and channel 5 of NOAA satellite). The
application of NOAA’s image data is the
most universal on account of its high
repeat rate and simple atmosphere
correct arithmetic. We can investigate
quickly the thermal radiation
characteristic of any area in real time
according to the retrieval model in
despite of some technology difficulty.

The emissity of seawater is
approximately 1 in thermal infrared
waveband, which change hardly with the
change of wavelength, sea condition and
seawater component. Compared with
seawater, the absorption coefficient of
terrestrial surface (such as rock,
vegetation etc.) is variable along with
the surface characteristic and
wavelength. Research on infrared
waveband emissity (temperature) of land
is advanced task in infrared remote
sensing. Currently, there is no universal
and effective method. We should
establish appropriate calculation model
and method to acquire actual thermal
radiation characteristic of land.

Influence of sun reflectance in
thermal infrared waveband

Around l=10mm, the irradiance
of land surface from sun is about (the
atmosphere transmissivity supposed 1):

E=5×10-1w/m2