Study Of Data Frame Of Large-Scale Urban Geographic Information System

The pivotal thing of the construction of UGIS is the construction of Data Frame. The kinds of UGIS data are abundant, and it contains a lot of things. The UGIS data has relative to many fields of the city. How to organize, store and query data effectively are very important to the efficiency of the whole UGIS.This paper is selected from the project of "Study and Demonstration of Basic GIS of 'Digital City'" which is charged with Shandong' "3S" center. The paper would make a study of construction data frame of large-scale UGIS in order to make a sound theoretical ground of the construction of Digital City. In the paper, the author brought forward firstly of Scheme of Topologic Coding on UGIS Classification and Coding based on Streets and Administrative Districts according to the existing national standards of UGIS Classification and Coding and corresponding digital city' methods of classification and coding. In the scheme, UGIS classification and coding are divided into three steps: administrative districts are firstly classified and coded, and then street and road with the corresponding code of administrative district added, at last add the code of both the corresponding administrative district and street or road into the code of other corresponding Geo-information. This method can reflect topologic relationship between objects, make a fast query and shorten the length of codes. The author also put forward the construction of UGIS seamless Database based on administrative district about how to construct the Database of big-scale UGIS. This method breaks the traditional method of construction of spatial data, makes the users put their attention to the query based on administrative and expresses the real world better.