MOVING MAP COMPOSER (MMC)

摘要

The moving map composer (MMC) (10) is a device to manipulate different sources of map data into a single map. The MMC (10) has an ability to extract a predetermined area of map coverage defined by sets of latitude and longitude points, non-orthogonal areas, segment. A bitmap is a representation of a map coverage selected by a user (16) having a "set", or "1" bit to indicate a segment is present, and a "clear", or "0" bit to indicate a segment is missing. The size of the bitmap (24) is determined dynamically to assure a two-bit buffer zone of clear bits around a polygon's extent. If the polygon is selected, it is subdivided into several new polygons. Once the total map coverage desired has been defined, the resulting subset is displayed. If the resulting coverage is acceptable, the user may transfer the data to the display (22).