An analysis of range error,which is induced by the factors such as scanning angle of laser beam,slope of the target terrain, scattering angle of laser beam,the precision of location of GPS and the precision of attitude measurement of INS etc,is proposed.A quantitative evaluation of the errors is discribed.All of these can be used as the scientific basis for practised using and improving of airborne scanning laser rangefinder.
Four methods of evaluating burned area of big forest fire,counting pixels corrected by pixel-value,counting pixels corrected by NDVI,calculating coordinators of boundary pixels and spreading-method,are presented through analyzing the material about vast area of forest fire in resent years and relative NOAA/AVHRR data.The above methods,based on GIS database,to evaluate the burned area of forest fire are accurate and fast.In this spring,there was a forest fire in the Inner Mongolia,the accuracy of evaluating burned area by using these methods is 90 percent.
Man-machine interactive interpreting and analysing by using remote sensing is the method of cooperating computer with man and doing remote sensing analyse together.It will be more exactly and effectively interpreting and analysing,because this method fully takes advantage of the computer and man.In this paper,it is carried out man-machine interactive interpreting and analysing of the land resource by using remote sensing with the help of Core1DRAW! 6 software,and do some research on its realizable condition, process and main characteristics.In the end,its applications illustrates by example.
This paper studied the applied benefits of meteorological satellite technology in Jilin province with Delphi method riper in expert valuations.According to characteristics of the application and service in the province,we defined the trades,extents,experts and contents of the valuation,and designed advisory investigation forms.The investigations were finished by means of communication,individually face to face with introductions in advance.After investigations twice in the experts selected,we adopted an unified calculation model to count up and analyse item by item in classified making use of gross national products(GNP) of related trades of Jilin province.Finally,it was obtained by synthetic analysis and valuation that the total applied benefit of meteorological satellite remote sensing technology in the province is about 530 million yuans(RMB),and the ratio between benefit and cost is 18∶1.
An automatic classifiction method for multi-bands clouds images of satellites is presented,it consists of collecting clouds images samples,selecting measurements for features,constructing representing models and classification trees.In order to bring down the difficultities for classification and reconition of clouds images,the non rigid bodies,we not only use the single band features of clouds images,but also conducting features fusion to get more information.Using this method,we identify automatically eight classes of clouds images successfully.
Snow disaster is one of the main disasters in the pastureland of our conutry.As one new advanced technique and having the characteristics of macroscopic synthesis and dynamic highspeed,remote sensing has been used in many fields and has done many contributions to these fields.In this paper,the advantages of remote sensing and its application in the research of snow disaster monitoring were introduced.
The popularity of GIS technology makes the geographic information sharing the greatest challenge in Chinese GIS Society.It is generally argued that data sharing is not only a technological activity,but also a economic and a social activity.The paper has focused its efforts mainly on the issues related to data-sharing technologies and standards.A summary of related problems in the current data sharing practice has been given in the first part.The supposition of further technical and standard-making efforts needed to tackle the problems has been presented in the second part of this paper,including the design of the semantis GIS model,the construction of the technical standard system,the GIS interoperabiligy and data safety.
The spatial database of the urban resources and environment information system was established in the central area of Guiyang city.The urban resources and environment are assessed comprehensively and the information is provided for the city planning and management by the means of the technology of remote sensing and geographic information system. The PAMAP GIS is the main tool to design and establish the spatial database.The remote sensed data is the main information to enrich and renew the database during collecting the data.The database comprises two parts:the first one is fundamental geographic database including the digital elevation model and the basic geographic maps;the second one is the resources and environment database including the thematic maps.
This paper focuses on the analysis and comparison of three common commercial software for remote sensing digital image processing.Three software:ENVI,ERMapper and PCI,by software s designing thought,construction,function and feature,are compared and analyzed.Meanwhile,the development of the technique of remote sensing image processing and the software pertinent is traced too.The three software are compared by their function,including file importing and management,image display and control,image correction,image enhancement,classification,vector,GIS and mapping,DEM,hypersectral analysis,and SAR processing.
Forest ecological research is an ambitious objective of remote sensing community for the future years,since many environmental problems,such as desertification,climatic change,carbon dioxide conentration,etc,are related to forest ecology.Imaging radar is a new remote sensing tool for forest ecology,and has played an important role and has obvious effects.In the paper,the author firstly introduced several imaging radar systems used for the forest ecological studies,which are the major imaging radar systems all over the world at present.Then based on a large amount of detailed references,the imaging radar for forest ecological applications, including in discrimination and classification of forest type,biomass estimation and forest change monitoring,are analyzed. Finally,the optimum radar parameters of forest ecological applications are suggested.It will be very useful to carry out forest ecological applications using imaging radar data.
Based on mastering the newest internal and external research positive results and taking part in many study works,the importance of remote sensing technology for grassland science have been mainly discussed in this paper,and further,the main research achievements and advances,and prospects of remote sensing technology for grassland applications are introduced and shown in order to provide general situations for understanding the developing trends and improving the decisions in recent years.
