雙語教學(xué)示范課程建設(shè)項目-資料下載頁
2025-04-17 00:07本頁面
【正文】 data that used to illustrate other datas. To better understand metadata and use metadata,we classify it into serval to its content,it is classified into three types:Scientific research metadata,which helps users to get data from all kinds of sources and other related information。Assess metadata,which is used to assess the use of data。Model metadata,used to describe the data to the object it describes,it is classified into other three types:Data layer metada,to describe each data in data assembly。Attribute metadata,related to attribute data。Entity metada,to describe the whole data to its function in the system,it is classified into two types:system level metadata,to realize the filesystem characters or to manage the data information in the file system。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.二、編程題includeincludemain(){FILE *fp1。float posx[100],posy[100]。float a[1000]。int i=0。int j=0。int n=0。float sum=,sum2=。for(i=0。i100。i++) {posx[i]=NULL。 posy[i]=NULL。 }i=0。fp1=fopen(d:\\,r)。while(!feof(fp1)){ fscanf(fp1,%f,%f,%f,%f,amp。posx[i],amp。posy[i],amp。posx[i+1],amp。posy[i+1])。 i+=2。n=i。}printf(n=%d\n,n)。for(i=0。in2。i++) { a[i]=sqrt((posx[i+1]posx[i])*(posx[i+1]posx[i])+(posy[j+1]posy[j])*(posy[j+1]posy[j]))。 printf(a[i]=%f\n,a[i])。 } for(i=0。in。i++) sum+=a[i]。printf(sum=%f,sum)。i=0。sum=sum/2。while(sum2!=sum) { sum2=sum2+a[i]。 i++。 }printf(x=%f,y=%f,posx[i],posy[i])。fclose(fp1)。}8 / 8
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