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2. 发明授权

US4939661A Apparatus for a video marine navigation plotter with electronic charting and methods for use therein 失效
标题翻译：用于具有电子图表的视频海洋导航绘图仪的装置及其中使用的方法
公开(公告)号：US4939661A
公开(公告)日：1990-07-03
申请号：US243317
申请日：1988-09-09
申请人： Christopher Barker , Christian Kunz , John A. Combs , John C. S. Park
发明人： Christopher Barker , Christian Kunz , John A. Combs , John C. S. Park
IPC分类号： G01C21/22
CPC分类号： G01C21/22
摘要： Apparatus for a video navigation plotter with electronic charting, specifically such a plotter designed for marine use, and various methods for processing navigational data therein and displaying resulting navigational data thereon are disclosed herein. Specifically, this plotter stores coastline data only for those cells which contain coastline data within a given geographic region of a pre-defined chart. The data for each of these cells is stored in a unique data structure that stores data for a plurality of line segments that, when drawn, collectively depicts the geographic data stored within that cell. Each segment is stored in terms of coordinate locations for a starting point followed by coordinate offset values for each successive point in that cell. Only those cells and their constituent segments are drawn for coastline data that exists within a specific region to be displayed. Once a coastline chart is displayed, the inventive plotter permits navigational data to be overlaid thereon and through this capability provides several useful features as set forth herein.
摘要翻译：本文公开了一种用于具有电子图表的视频导航绘图仪，专门用于海洋用途的这样的绘图仪，以及用于在其中处理导航数据并在其上显示所得到的导航数据的各种方法。具体来说，该绘图仪仅存储在预定义图表的给定地理区域内包含海岸线数据的单元格的海岸线数据。这些单元中的每一个的数据被存储在唯一的数据结构中，该数据结构存储多个线段的数据，当绘制时，它们共同描绘存储在该单元内的地理数据。每个段以起始点的坐标位置存储，然后存储该单元中每个连续点的坐标偏移值。仅对存在于要显示的特定区域内的海岸线数据绘制那些单元及其构成段。一旦显示了海岸线图表，本发明的绘图仪允许将导航数据覆盖在其上，并且通过该能力提供了如本文所阐述的若干有用的特征。

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