Study On Geographic Internet Protocol Of Spatial Geography Data Subdivision

With the broadening of application domain of Geographic Information System(GIS) and the rapid development of spatial information techniques and application requirement, the GIS is demanded to develop from local application to global application in depth. The geographic information system science takes on enormous,real time,distributed,fine-grained character and so on. So a new spatial information processing scheme and bran-new digital earth platform is pressed for so as to adapt to new change. This new scheme will deal with mass spatial information such as storage,dispatch and dispensation and in the scheme, the scale of area can be changed neatly,the catalogue should be unified,the index should be highly-efficiency and the split joint of the spatial position should be expedient. This geographic identification protocol of spatial data subdivision (GeoIP) will solve these problems and this thesis will study GeoIP.The GeoIP will solve the problems such as the instauration of new earth subdivision model,the global encoding of subdivision patch congruously,the storage and dispatch of subdivision data conformably,the construction model of GeoIP. The GeoIP is a new protocol which can break through the traditional mode of separation picture,zoning and split field and stand out bran-new spatial information dealing mode. In this model, the encoding,processing and transmission of subdivision patch have been defined.The earth is a complicated system. First of all, we should locate and distill the investigative object and this work is subdivision and encoding. The polyhedron subdivision model,self-adapting subdivision model and subdivision model based on latitude and longitude are common subdivision models. Though these models have itself advantage, they have shortcomings in expressing the geographic spatial information. According to the basic principle of scientificity,hierarchy,practicability,commonality and stability, the subdivision model based on latitude and longitude has been put forward and the model adopts grid subdivision by the frame of reference of latitude and longitude. The model is simple and the encoding is also convenient.According to the subdivision model, the subdivision patch domain encoding method(SPDE) is built in the thesis. The SPDE adopts numeric string which likes the head information of IP data message in TCP/IP network protocol to express whole information of spatial entity in order to predigest data storage form and to save storage space. At the same time, the time information of the subdivision patch can be taken into account. The spatial information and time information have been bound together and the Space-Time Record Structure which is based on space and the time is an important attribute is shaped. The domain encoding is a system of multiple scales and multi-tiered. The ultimate character of SPDE is that can express holographic spatial information. That is to say, the whole information of the researched entity can be analysed from existing subdivision information by encoding technique and method. The SPDE is the base of global,multi-resolution,multi-scale and open spatial information express.According to the SPDE, the method named MAMI method(Multi-address Mapping Integration) is put forward in the thesis. The SPDE integrates the address of ground object,the address of patch storage and encoding address. On the basis of address mapping relation, the subdivision patch can be stored in predetermined cluster server so as to realize the LEES(Location is Encoding and Encoding is Storage) .That is to say, the encoding can be decided by ground object and the storage can be decided by encoding. In the cluster, a node host acts as cluster management and all information requests are received and disposed by this node. The all nodes of the cluster have buffer in local memory. When a node will use memory data of the others, these data will be pushed into the local buffer by network. The storage mode can solve the problems of load balancing,high availability storage and centralized management in data storage effectually.Use the experience of computer network, the SDND(Spatial Data Network Dealing) model based on the SPDE and MAMI is built. The SDND includes the high-speed broadband link interface layer,GeoIP subdivision patch routing addressing layer,UDT subdivision patch transport layer and subdivision patch information application layer.The function of the high-speed broadband link interface layer is to realize the high-reliability and transparent data transport by using the serial data transmission function which is provided by physical layer.The subdivision patch routing addressing layer is the bottom layer in dealing the subdivision data of end-to-end transmission and routing algorithm is needed.The task of unfailing UDT subdivision patch transport layer is to provide reliable and reasonable data transmission from source to destination.The subdivision patch information application layer will express spatial information by the way of multiple-source,multi temporal analysis,multi-resolution,multi-dimension,heterogeneity and magnanimity. And the conceptual model,organic model and data storage model of spatial data will change greatly. The traditional modes of Client/Server and Browser/Server are not easy to adapt loose coupling of internet. So in this thesis adopts DDICSA(Data Decentralization & Information Convergence & Services Aggregation) method which is oriented to G/S(Geo-Information Browser/Spatial Data Cluster) mode in information express. G/S mode is standard data interchange based on the HGML(Hyper-geography Markup Language). In this mode, the function of space-vector model rebuilt and three-dimensional graphics operation can be implemented. The G/S mode constructs compositive circumstance of calculation and resource and can realize share in word and deed. The end of G can analyse and calculate powerful spatial information and the user can use multi-source information and receive all kinds of service at the same time. The end of S can provide servers such of user authentication,dispatch control,data access,zip and unzip. The DDICSA can display complicated spatial information vividly and reduce computation complexity of spatial data network access at the end of Server.The main achievements and innovation of the thesis is as follows:1. The subdivision patch domain encoding method (SPDE) is put forward. This encoding method not only takes into account the subdivision levels but also puts the attributes of spatial information such as the time of spatial information,storage address,storage mode and so on into the encoding category. Thus the global unique identification (GUID) can be realized.2. The multi-address mapping integration method(MAMI) is brought forward.The spatial address,storage addrss and encoding address are bound by the MAMI and the requirement of SLLR(storage is location and location is routing) can be met. The scheme of cluster storage is brought forward on the base of SPDE, the subdivision patch should be stored into the default cluster server and the network routing should be clear according to the mapping relation of cluster server and subdivision patch.That is to say, we can confirm the location by encoding, confirm the storage by location and confirm the routing by the storage.3. The architecture model named spatial data network dealing (SDND) which is based on the SPDE and MAMI method is built.The model includes four layers:high-speed and broad-band link layer,GeoIP subdivision patch routing layer, reliable UDT patch transport layer and information application layer oriented G/S mode. The model adopted the strategy of data decentralization,information convergence and services aggregation.The SDND model can display the complicated spatial information vividly and increase the efficiency of network access to spatial information data.The SDND model of GeoIP architecture fuses the techniques of subdivision,cluster and high-speed transmission. The mode of G/S provides normative and feasible technique construction for the application of spatial information under the circumstance of computer network. The thesis provides technique reference for uniform,global,consecutive and dynamic application of geographic information. The above solutions provide new theory and research technique for mass spatial data processing, and it is practical and should be promoted. It is believed that the series of theory will be an important study direction in the future.