The paper discussed the theoritical basis,technology schemes,and operating rules
about atmospheric correction and ground spectral reflectance retrieval of AIS data by the
field spectral calibration and remote sensing equation. The some ground target’s re-
flectance were extracted from AIS data.The feasibility about this method was discussed.
The research results showed:(1)This method is simple,convenient and practical;(2)The
selection of field calibration points and spectral measurement precision are main factor for
reflectance retrieval precision;(3)Geometric parameters of sensors,fly time interal,terrain
factor and bidirectional factor are important reasons for spectral reflectance retrieval re-
sults.
In order to satisfy the requirement of the simultaneous measurements of the radiome-
tric calibration, it is necessary to seek a simple, convenient and high accuracy method for
measuring the spectral optical depth. Therefore, we had several days measurements by us-
ing the Spectroradiometer VF921-256 and the solar radiometer DTF-1 simultaneously in
Hefei city. Based on the results comparison, we found 1%~4% difference between them.
The difference is not only due to the VF921-256, but may be attributed to the calibration
error of DTF-1. It is shown from the fitting of measurements of VF921-256 that the stan-
dard deviation is less than 0.03. So that the irradiance-based method of atmospheric opti-
cal depth measurements can be used to simultaneously measure the optical depth during
the radiometric calibration. Meanwhile, we also retrieved the atmospheric aerosol size dis-
tribution, the ozone and water vapor colume content of Hefei city by using optical depth
information.
The rice yield estimation could be based on the relationship between spectral variable
and yield, and the YLDMOD (crop-weather model) having high accuracy. Both of them
had their advantages and defects needed improve. In this paper, a new method of combin-
ing the advantages of the two methods was made and discussed, and the new method has
the advantages of high accuracy and high speed.
With industrialization and an increasing range of service offered,the land surfaces of
Hong Kong are heavily loaded with closely-packed automobiles,people and buildings.Im-
proved techniques to enhance environmental monitoring are still needed.We propose a nov-
el method to characterize the parameters of environmental pollution resulted from trans-
port in four layers.This paper has composed an integrated transport environment analysis
system designed to meet the needs for obtaining the environmental parameters.
In this paper, the recent changes of lake area in the Four-lake Area were studied by
interpreting on the multi-temporal images of Landsat MSS and TM. The results show that
the area of the lake has been decreasing since the early of 1950' s of this century and the ex-
tent of decrease during the period of 1950' s~1970' s is far more than that of after the
1970' s. The reasons for the changes were the human activities and the natural evolution.
Based on the above mentioned, some suggestions were given on the rational utilization and
protection of the lake resources in this area.
Due to deficiency and interpretative uncertainty of deep geological data, the correct
application of associated multi-factor information is especially important for the research of
oil-and gas-conducted structures. The key to analyze multi-factor information quantita-
tively and comprehensively to obtain correct conclusions is to apply multi-factor true three-
dimensional geological information system(MT3DGIS). Using this system, we register
and make correlation analysis between variables from remote sensing, aeromagnetic, and
gamma-ray spectrum data, and make 3D solid visualization of stratigraphic data. Through
these analyses mentioned above, we find that under depth of 3 500 m, two NE extended
basins were controlled by a NW extended structure. This structure was large-scale deep
permeable structure with multiphase tectonic activity. So, we suggest that this structure
is a oil-and gas-conducted structure. This inference is coincident with deep seismic sound-
ing. The occurrence of a large gas field above this structure also supports this. Our con-
clusion has been adapted by relevant institutions. The application effect of this system in-
dicates importance of MT3DGIS in research of deep geological information.
The basis of airborne millimeter wave imaging microwave radiometer antenna scan-
ning system, the selection of controlling motor and the balancing weight of antenna are in-
troduced. The scanning accuracy is improved by adopting structures of master-slave com-
puter and zero-detecting. The system is simplified and easy to be controlled by selecting a
small step angle and high precision step by step motor. It also overcomes the problem of
step displacement by adopting balancing weight measure of deviate spindle set and there-
fore increases the scanning precision.
The antenna temperature of a aperture calibration source is a key feature for mi-
crowave radiometer calibration,and its coherent part is usually omitted when its incoherent
part is used to interpolate the temperature of a measured object.This paper analyses coher-
ent antenna temperature of a low-temperature source cooled by liquid nitrogen and a room-
temperature source.It is given that coherent antenna temperature is a function of an in-
verse-radiating noise temperature from a radiometer,and reflection coefficients of the an-
tenna and calibration sources.A way is obtained to reduce coherent antenna temperature.
The conception,content,historical development and present situation of the remote
sensing of petroleum resources were explained,and the developmental trends and applica-
tion prospects of this newly emerging discipline were submitted in this paper.A new sen-
sor:Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) carried on
EOS AM-1 which will be launched in 1998 was introduced,and the basic principles of re-
mote sensing detecting petroleum were also proposed by the author.
Imaging spectrometer is a new kind of remote sensing sensors developed from the
1980’s.It receives images of ground objects as well as their spectrum components.Due to
carrying high spatial and spectral resolutions,imaging spectrometer has great potentials in
accurately quantitative analysis with remote sensing.And now,it has been one of the two
hot spots within remote sensing technology and applications.Following a brief analysis of
the characteristics of imaging spectrometer data,this paper reviews the status of methods
used in imaging spectrometer applications,and discusses the studies necessary for the fu-
ture operational use of the data obtained by the attractive instrument.These studies in-
clude information extraction and compression,imaging spectrometer image processing sys-
tem development and applicational model establishment.
Some methods and techniques of snow remote sensing were briefly discussed in this
paper.The contents mainly involved with the characteristics of snow remotely sensed data
as well as their possibilities and limits in snow monitoring and snow information extrac-
tion.The methods of calculating snowcover area,simulating snow depth and evaluating
snow water equivalence were also introduced.Some applications of snow remote sensing in
snowmelt runoff simulation and snow disaster monitoring were described.The prospect of
snow remote sensing was discussed based on some new developing trends in this field.
