The Compression And Application Of Raster Map Data Based On GeoPDE

With the rapid development of GIS technology and widely used, it is required of it is increasingly growing. Demand from digital maps, electronic map applications, widely disseminated to the network map, GIS has imperceptibly deep into people’s lives, and network transmission process, there narrow bandwidth wireless communication network, poor stability, limited mobile terminal equipment hardware conditions such as lack of, limiting the efficiency of GIS to provide information services. Extensive GIS applications, a large amount of data spatial data transmission and wireless communications network bandwidth narrow, limited transmission conditions become increasingly stand out, there is an urgent need to address the spatial data compression and transmission problems.Aiming at the development of GIS information carrier, compression problems and the lack of domestic GeoPDF research. The Paper selected GeoPDF format as for geographic information bearing on the application of GIS data, exploring geographic information documentation, reducing map data storage space, speeding up the map of the network transmission speed. First of all, design and put forward by the paper map to the GeoPDF mapping process, use the DOS command set and VB language two batch mode of GeoPDF map to achieve mass production. Through the study of different characteristics in storage, compression mode of GeoPDF and other traditional image such as JPEG, compared the effect of image in the process of GeoPDF map making technology, stretching parameter, style compression and pixel and the scale parameters on the map, and the advantages and characteristics in GeoPDF format map. Summarize the advantages and characteristics of GeoPDF format map. Finally, taking GeoPDF as the information carrier has explored the making of the Web electronic map and other special application. Technical scheme to solve the application needs a "geographic information document" Japanese project, mass production of GeoPDF has also invested in the project application.