Design And Implementation Of Grid Map Component Based On Standard Widget Toolkit

As the economy and the continuous development of science and technology, personal information on the application of geographic information needs of an increasingly strong electronic map has become a space for people to understand an important means of information now widely used in various areas of society.Raster electronic map based raster data structure, simple structure, redundancy small, easy to operate, depending on the advantages of good sense, are widely used in many geographic information systems.On the majority of simple applications, the geographic information system's secondary developments based on components have many flaws,for example,it requirs specific softwares or tool kits,the tap costs are high,having rubs for integrating some simple map information systems,being unable to transplanting on the embedded platform and so on. The current development trend is how to make getting and integrating functions of the electronic map commonly.Firstly,this article analyzes the development state of GIS's E-map home and abroad, introducing existing digital map's development ways,explaining the switch theory and performable methods between the geographic coordinates and the pixel coordinate. Secondly,it introduces the standard components of the JAVA,designning the framework of these components,defining the transaction of the relevant cases and set asid a variety of display and data storage functions interface.Fllow,it researchs and resolves a way of local storage method with the raster images,putting forward and implementing a algorithm which can piece raster images at a variable region.Designed a storage and extraction method about the flag and information of POI,and implemented a packing tool on the POI file.Simultaneity,it brievs overview of realization about the real time track.Finally,it analys the algorithm's efficiency which can piece raster images,showing the task effect of all components.Meanwhile,it names the essential upswing and further way of progress of this component on the embedded platform applications.