A Computer-aided Design System For The Planning Of Polder Region River Net Based On GIS

With the development platform of Microsoft Visual Basic 6.0, A Computer-aided Design System for the Planning of Polder Region River Net based on Geographical Information System is developed in this thesis. A new OO(Object Oriented) programming method is adopted in this system where various software such as Visual Basic, MapInfo Professional 6.0, Microsoft Access and so on are integrated. Dynamic planning of polder region levee and flood preventing buildings, statistics of planning work, the output of design results can be partially done automatically so as to meet to the requirements of polder region planning. The GIS technique is applied to this system for the first time. Electronic map of MapInfo is introduced into the environment of object oriented by the use of Map X 4.0 module. The operations such as dynamic add, delete and edit of objects can be done real-time dynamically by operators in the environment of object oriented on the present diagram of polder region. At the same time, the spatial-data and attribute-data of irrigation district are managed separately. The spatial-data is used by the file system, whereas, the attribute-data exist in the relevent database. The figures and database are related through the only ID number in order to realize two-way inquiry, so that, the polder region river system planning data are collected automatically. Moreover, this system make the great use of GIS advantage in storing and annalising data to automatically organize files needed in river network calculation , adopt one-dimensional unsteady flow model , so as to lay out height of river levee .The programming methods, system structures, developing processes of every part are described in detail in this paper. In the end, the directions of the system are demonstrated in a sample area which lies in the XiangCheng country, SuZhou City, Jiangsu Province, the running results show that the system is operated easily, the interface is friendly, the running speed is fast, the planning results is reasonable, which meet the command in advanced, and the system has a preferable practicability.