Research On The Method Of Digital Image Map Tile Creation Based On Hadoop

The technology of map tile creation can send the image data to clients by small pictures,making the rapid transfer of image data possible.Faced with drastic expansion of image data,if traditional technology of map tile creation is still used on the server side,the technical bottlenecks may be obvious considering the efficiency of creating map tiles.Therefore,the research of map tile creating with high efficiency can be of greate significance.Meanwhile,distribute technology of massive data is widely used.Hadoop,an open-source project can be used as a distributed and parallel programming frame and reduce the difficulty of developing distributing programes.Based on Hadoop,this dissertation makes some researches on the creation of map tiles by image map and the storage of map tiles.After analyzing the features and development of map tile creations,this dissertation points out the probems of inefficient map tiel creation and distributed computing is proposed for map tile creation.The distributed algorithm of map tile creation based on MapReduce and the stored pattern of map tiles based on HDFS are proposed on this basis.The research contents are as follows:Firstly,this dissertation makes some analysis of the traditional technology of map tile creation and points out the bottlenecks of the trational technology in the case of massive image data.After analyzing the key technology of Hadoop,this paper designs a model of distributed map tile creation of image data based on Hadoop.Secondly,this dissertation makes some researches on the method of making map tiles at different levels in a distributed environment based on parallel programming framework.Considering the characteristics of image data,this paper design an algorithm of map tile creation based on MapReduce to parallel the computation steps.Thirdly,by analzing the implementation of HDFS,A parallel storage pattern named HDFS-MT was proposed for map tiles.Based on the pattern,index for distributed file system makes the map tiles read and write more rapidly,and improves the efficiency of map tile creation indirectly.