A Study On Open Map Publishing Data Model

Map publishing is an essential aspect of cartography. Any information system is based on data model. In this dissertation, various map publishing systems are analyzed, some shortcomings of their data models are indicated. and the topic which is the open map publishing data model is advanced. The open map publishing data model is the basic element of the open map publishing system. It should satisfy several basic requirements which include the scientific and comprehensive characterization about map publishing information, openness and the share of map publishing information. The main research achieved in this dissertation is presented:1. Several major techniques and theories including OpenGIS, spatial data model, PostScript, PDF and JDF are analyzed. Then, the research architecture about open map publishing data model is ascertained.2. The involved information in the map publishing system are introduced briefly. Through analysis the information is divided into seven types, including coordinate reference information, map publishing symbol information, vector and graphics information, image information, font information, color information and metadata information.3. For the share of map publishing symbol, the author brings forward the idea about the standardization of map publishing symbol, and presents a specific method. Especially, the standardization of the structure and accessing interface of the map publishing symbol is discussed in detail. For the fine quality, an anti-aliasing algorithm suiting map publishing symbol is discussed.4. The vector information and graphics information are distinguished and characterized in this dissertation. Graphics is divided into simple graphics and combined graphics. Vector information includes geometry information, attribute information and topology information. Geometry information is characterized based on spatial entities, and topology information is characterized based on topology rules.5. The presenting method and compressing code suiting digital image in the map publishing systemare discussed. a kind of strategy managing layered image is advanced.6. The text information in map publishing system is divided into label and annotation, each of which includes simple type and complicated type. The storing structure of various text is discussed in this dissertation. Font is important for the publish of text. Some techniques about Chinese font are introduced.7. Color management is the basis of WYSIWYG. Firstly, The author introduces the theory of open color management system, including the device characterization based on Profile and the conversion among different color spaces. Then, the principle and method on color management in open map publishing system is presented.