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2025-06-04 00:07本頁面
【正文】 ountries successively built many professional LMIS and GIS. Meanwhile, GIS software market is very active. The government, mercial pany and university began to pay attention to GIS technology and GIS bee a domain that attracts everyone. ③ The phase of GIS popularization and application:In 1980s, With the improvement of ratio of capability and price of figure workstation and PC, Computers and spatial information system are widely applied. GIS application began to change from the spatial data management to spatial decision analysis with the development of GIS software and hardware. ④ In 1990s,With the building of geography information industry and the popularization of digital information product in the world, GIS goes into a large number of households and bees a assistant and tool of people39。② Functions of GIS。④ Deep process of geographical information in GIS。Assess metadata,which is used to assess the use of data。Attribute metadata,related to attribute data。Applicationlevel metadata,which helps users to search,estimate,visit and manage data as well as some other information related to data to its function,it is classified into two types:Illustration metadata ,specially serves when users use data:Control metadata,used to control the operate process of a puter. The main function of metadata include five aspects:The first one is to help the data produced unit to efficientlly manage and maintain spatial data,to establish data documentation,and to ensure the understanding of ,the metadata will provide the dataproduced unit with lots of information about data storage,data classification,data content,data quality,data clearing house,data sale and so on,so as to be convenient for users to search and reach spatial third one is to provide methods or ways of searching data through the Interner,and assitant information about data exchange and forth one is to help users to understand data,so as to make correct judgement about shether the data could meet their last one is to provide some information that is helpful for users to process and convert useful data.6. Illustrate the characteristics of GIS spatial Database and its basic organizing pattern.Answer:Characteristics: (1)Traditional database system manages discrete,lowcorrelative numbers and information data is continuous, and has a strong spatial relevance.(2) Traditional database system manages little types of entities, and the spatial relationship among them is usually simple and entity type of geographic spatial data is various,among which there is a plex spatial relationship,and s
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