An image-based retrieval method of surface reflectance for Landsat-5 TM images is
proposed.An outstanding feature of this method is that all needfull parameters,such as
aerosol optical depth,single scattering albedo,are derived from the information contained
in the images.The determination of atmospheric path radiances was performed by improv-
ing the traditional dark-object subtraction technique.In order to avoid solving the complex
radiative transfer,we make use of parameter embedment technique and semi-empirically
numerical algorithm in program design.The method is evaluated and proved to be accu-
rate,rapid and useful by simulation.As one of its vertifications,we applied the method to
landsat-5 TM image obtained on September 25, 1992 to retrieve the surface reflectance,
and compared them with field-measured reflectances performed in June 1994 and Septem-
ber 1996 respectively.
With the entrustment of the University of Hong Kong, the project was to study the
on-the-spot information of the inner ship waves and their incident &reflection waves at
different typical seawalls in Victoria Harbor with terrestrial photogrammetric technique.
The synchronous terrestrial photogrammetric technique. The synchronous terrestrial
stereophotogrammetry has been carried out to the entity of ship waves in Victoria Harbor
and the contour plots of waves have been obtained with analytical surveying and mapping.
The statistical analysis was performed with the relevant information of height of ship
wave, shipspeed and their incident &reflection waves. Furthermore, the ability of wave
generation of common ship in Victoria Harbor and the propagation procession of incident &
reflection waves were studied and analyzed.
The runoff of low water of river is a show of the hydrologic situation. This thesis introduces the estimation of the runoff of low water resources of river,in Li Xian jiang basin,Yunnan province.It focuses on the discussion of the methodology for the determination of regional hydrologic model parameters, based on hydrolographic regionalization map,it is compiled by overlapping geomorphological map,geological map,vegetational map etc,which are the interpretation results of the spatial information of remote sensing.It is indispensable for integrative research on the runoff of low water in non-information region.
Remote sensing technology has been widely applied in crop area and production esti-
mation.How to forecast the crop area year-by-year has been a key concern of remote sens-
ing specialists.In this paper,the methodology of a study from 1991 to 1995 for rice plant-
ing area estimation integrated with NOAA AVHRR and Landsat TM data was introduced.
Rice area in 1992 was estimated using Landsat TM data.Rice pixels in 1992 and 1994 were
calculated and the rice area variation was deduced from NOAA AVHRR data of the two
years.With a linear statistical model,the rice planting area of 1994 was forecast.Its accura-
cy was 84.5 percent compared with the data released by the Agricultural Investigation
Team(AIT) of Hubei province.Similar method was applied to estimating the rice area of
1995.The result showed a 91.6 percent accuracy compared with the AIT data.
In this paper,a sophisticated and automatic monitoring system for field environment is introduced.Its center processor is TMS320C30.This system can realize real-time acquisition and processing of spectrum data of field pollution.This paper relates the composition of this sytem,relevant interface,the principle of Radiative detection and design of software.
Based on analysis of traditional development models of project-oriented GIS,this pa-
per proposes another model:shell model.Following the thought of“shell model”,a geo-
graphical information query shell(GIQS) is developed.GIQS’implementation is intro-
duced in detail,which includes system structure,main file types of GIQS,classification and
encoding as well as the implementation of“two-direction multi-function query”.The in-
dexing mechanism and“compressed tree-like binary search”greatly improve the efficiency
of GIQS’functions.
The software structure, function and characteristics of the main foreign geographic
information system softwares, which are ARC/INFO, ERDAS, GRASS, GIST, MGE,
EPPL7, IDRISI, PCI and MAP/INFO are introduced in this paper.
The rise and development of studies on vegetative bidirectional reflecting property
over the international remote sensing circles are summarized.The author’s viewpoint on
the classification of recent theoretical models is stressed that according to the models’ori-
gin and the media unit they consider,there are only two types of models,the geometric op-
tical model and the radiance transfer model.The recent status of the scope and the charac-
teristics of the research is also introduced briefly.Then,an overall and detailed review on
the related works recently,especially in latest few years,is developed in three aspects,the
research on theoretical models,the measurement of surface BRDF,and the analysis on
BRDF of remote sensing data.Finally,it is indicated that as the basic realm and the popu-
lar domain in the research of remote sensing information sciences,the studies will surely be
practical on the base of their accumulated and abundant academic fruits.
Characteristics of remote sensing instruments in visible,infrared and microwave bands
were analyzed.Microwave remote sensing instruments are compensations of visible and in-
frared sensors that they have the disadvantages of getting images in low efficiency,diffi-
cultly obtaining characteristic information of objectives and achieving quantitative remote
sensing.The function of microwave remote sensing instruments were pointed out.The de-
velopment and application of airborne synthetic aperture side-looking radar,airborne mi-
crowave radiometer,airborne microwave scatterometer,and airborne ocean radar altimeter
in China were summarized.The achievements indicates that the airborne microwave remote
sensing instruments have achieved practical level.It has been used in productive activities,
scientific research,disaster prevention and mitigation research,etc.The situation of mi-
crowave remote sensing instruments installed on world’s major earth observing satellite
were listed.Microwave remote sensing instruments are being used more and more in earth
observing activities because it can provide effective information in developing and utilizing
sources,protecting the environment,preventing and mitigating disasters.
In order to early achieve distinguish feature of spaceborne microwave remote sensing
in our country,China should strengthen unified leadership in microwave remote sensing re-
search and application,focus manpower and material resources to develop airborne practi-
cal level,ground experiments and the theory of microwave remote sensing.
The paper mainly introduced the fundamentals of artificial neural networks and the status quo of their applications in cloud classification.Based on the aforesaid introduction,the author discussed some problems which would be confronted when classifying cloud types using artificial neural networks and predicted its trend of development.
