Research On Construction And Application Of Land Use Database System For County

Since the human society enters the later period in the 20lh century, the human civilization is in the stage of an information-intensive society. Today, the information technology has permeated in all fields of the world at an unexampled speed .In the tide of all trades actualize digitalization and information, our country's land information digitalized project has received considerable development as a part of national spatial data infrastructure. Under the great background, this paper clarifies the method to build the county level land utilize database.Among the summary, I clarify the background, the meaning, The relevant subjects' development, donlestic and international research dynamic status of this subject. At first, I introduce the tide of information and digitalizalion in the world. Secondly I introduce the great background of this research work --what is "digital earth", 3S technology development, the evolution of digital territory project, the achievement of land detailed survey and so on. Then, I analyze the progress of land information system construction and digitalization geographical information at home and abroad. Based on them, this article elucidates the meaning and foundation of the county level land utilize database.Chapter II- the division of land use database for county establishment period. It includes three phases?system analysis, developing, maintaining, where I put a special emphasis on the system analysis. System analysis is made up of determining tajsic, feasibility study, demanding analysis, structure frame design. Feasibility study indicates that land use database system can be achieved through our technology and Yanshi city land administration bureau's assist. The structure frame design is clarified through the following three aspects-systematic function design, data structure design, and systematic software and hardware design.Chapter III- the establishing procedure of land use database management system for county . Firstly, overall design of land use database is necessary, which is made up of map index table, date dictionary, attribute and spatial data of every year. At the same time I explicates their meaning and content as wellas the design of the coding of data-inputting classify, file name and the attribute database structure. Secondly, I introduce how to prepare datum and technology and list all prerequisite tilings - all kinds of maps, data tables, reports and material device. Afterward, introduce the work foundation, technological route and environment of software and hardware in detail, and make a brief introduction about MAPGIS and land use database system. Thirdly, I expound the course of gathering data, handling data and building database. This database establishment course is divided into the following several stages: Work preparation, data pretreatment, data collection and editing, database creation, database quality control, data of map and table export, report compiling, database confirmation, belonging the output to file, database update and application, database run and management. This chapter elaborates the specific operation and the question that should be taken notice about the former five parts. Data pretreatmeut means overall examining map and table, and solves those problems found in this course in lime. Data collection and editing work include: maptfcan, map correction, vector with different layers, error correction, map projeciion, data layers division, attribute data input, the figure connection, map splice etc. Database is built by making data dictionary and map index chart. The quality control of the database runs through the above each step.Chapter IV- comparing the area calculated by computer with recorded by original table. This chapter discusses the accuracy of data mainly through map spot area compare, map area compare, area of city and village two level jurisdiction compare, area of land use one grade ehissify compare. At last, analyzes the reason that caused the difference.Chapter V- the method of the database update. It is exp...