Design And Implementation Of Map Library Management System In MEGIS

The map library manager system is a software system that runs in the Windows platform, and it realizes the preprocessing and the display simulation of spatial data to the military Embeded geographic information system. The paper designs the map library manager system, and based on this system the paper also realizes the preprocessing and the checking of spatial data to the MEGIS, the details as following:(1) the paper accurately grasps the special demand of MEGIS in the aspect of the spatial data organization and the management in the whole, and analyzes the data model and the realization of the storing structure based on the data modal in MEGIS.(2) the Paper brings forward《Classification and codes for the Features of military base geographic information》as the standard of the semantic consistency processing to the spatial data from different source, and realizes the classifying and coding of the geographic Features of MEGIS.(3) the paper selects and design the processing model to realize the spatial data preprocessing, includeing: spatial data semantic consistency processing model; selecting model of attribute information of the geographic features; coordinate conversion model; index processing model of spatial data; LOD processing model of spatial data; compresses model of spacial data; maintenance and management model of topology between area and its related chains ; join model of features crossing different map sheet.(4) the studying of the three level index from saving, the realizing of the memory organization and building.(5) the paper realizes spatial data model conversion from the military digital map exchanged format or military digital coordination map format to the special data format of MEGIS. The paper explores the conversion from the data model of ArcInfo, MapInfo to the data model of MEGIS.(6) the study and realization of the spacial data management in the process of display simulation.The final fruit of the study of this paper is a platform of spatial data preprocessing and checking, which runs in the Windows system, and in which man-machine interaction and its combine with the embedded terminal system can be realized.