To create their open - source maps , openstreetmap volunteers travel through a region on foot , by bike , or by car with a handheld gps transponder that logs their route 要建立它們自己的資源開放地圖,志愿者們要用腳,自行車或汽車走遍一處地區(qū)。用一個手持式gps發(fā)射儀記錄他們的路徑。
Once the data set is defined , you have the option of including the data set object instance in your component tray for rapid data source mapping to form controls in your forms designer 一旦定義了數(shù)據(jù)集,您就可以選擇在組件托盤上包含該數(shù)據(jù)集對象實例,用以將數(shù)據(jù)源快速映射到窗體設計器中的窗體控制。