发明名称 Vessel traffic system
摘要 A method and apparatus for merging specifies an inset chart shape and at least two chart scale values. A chart retriever retrieves data files defining a low-scale chart and a high-scale chart, and a chart processor identifies portions of the low-scale data files from which data is deleted and merges the modified low-scale data files with high-scale data files which provide high-scale data for the inset chart shape.
申请公布号 US5928304(A) 申请公布日期 1999.07.27
申请号 US19960733749 申请日期 1996.10.16
申请人 RAYTHEON COMPANY 发明人 PRIESS, TODD W.
分类号 G01C21/20;(IPC1-7):G06F165/00 主分类号 G01C21/20
代理机构 代理人
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