Development Of Decision Support System Based On GIS Of Agricultural Products Logistics Distribution

With the development of the supply of agricultural product going abundant,The key point of development of the rural economy has turned to the currency field from the producing field. The agricultural product logistics distribution is a vital point of the whole agricultural product supply line. But in China, the channel is chaotic, the waste of distribution process is big, the distribution time is long and the cost is high in the agricultural product logistics distribution. Foundation of decision support system in the agricultural products logistics distribution corporation,can be effectively assistant to deal with a lot of decision problem in the cource of logistics distribution,enhance the management level of logistics system,shorten the time of making decision,accelerate the scientific logistics decision.The text have done the particular research on the base of the research status quo of the logistics imformation system and decision support system based on GIS,study and develop the decision support system of the agricultural product logistics distribution for the center of the agricultural product logistics distribution. this system can not only accomplish the daily function of information storage of the agricultural product logistics distribution center,but also achieve the decision fuction of route optimization and the location of center,which can be easily used.The main content of all the part can be listed as follows:Chapter one is introduction. This chapter expatiates on the motive and significance, introduces the status quo of the domestic and foreign research of the logistics imformation system and decision support system based on GIS, confirms the technology route, structure and main content of this paper.Chapter two is logistics decision system and the relation of theoretics summarize.Firstly,the conception of logistics distribution and logistics; Secondly, particularly introducing the theoretic,structure of GIS as well as the characteristic, fuction and development history of the GIS database,these are are theoretic foundation of developing the system; thirdly,particularly introduces the background,definition and system structure of the decision support system, also,analyses the today's developing trend of research of decision support system ;Finally,gives the decision support system of this paper-the space decision support system based on GIS.Chapter three is collectivity design of decision support system of the agricultural product logistics distribution based on GIS.Firstly,particularly indicates the idea of system design,system target;Secondly,summarizes the advantage and disadvantage of structure systematic of C/S and B/S,considering the factors of data security and data running speed,this system choose the structure systematic of C/S,and gives the collectivity structure chart of system;Finally,indicates the design principle of the system,have accomplished the design of all the functional module of the system.Chapter four is the design of the datebase of decision support system of the agricultural product logistics distribution based on GIS.At first,indicates the commonly step of the datebase design.Following this step, firstly, analyzes the demand of the system.Secondly, basing on results of the analysis, constructs a flow chart of the database . at the same time,offers the design of the notional structure about the system. The structure is a notional model that can be depicted with the E-R plot.Thirdly, designs the logic structure of the database. The cause of the designing is to switch the structure of the notional model to a data-model that is sustained by an idiographic database management system.Fourthly,offers the design of the physics of database,gives the sketch map of the data of the property and spacedata fixid.Finally,uses the language of SQL to establish program sentence of table,accomplishing the design of the database of the system.Chapter five is the design of the model-base of APLDDSS based on GIS.Firstly,introduces the concepts of the models, model-base and system functions of the model-base. Considering the actually situation of the agricultural product logistics distribution,in the mode-base of the system, uses the model of the route optimization and the location of center to deside the actual task of the distribution center,and introduce the math formula and explaining the step of all the model.Finally,offer the mathod realization of the model of the system.Chapter six is realization of APLDDSS based on GIS.Firstly,introduces the soft and hardware running environment of the system.Secondly,putting a example of the center of the agricultural product logistics distribution to show main function of the modules to explain the system 's usable capability and maneuverability .Chapter seven is drawing the main creating points of the paper and presents the main direction and the field which should be studied in the future.