空间数据产品坐标系统转换方法与实现

摘要

The principle of coordinate system conversion of 3D products ( DOM, DLG, DEM) among 1954 Beijing Coordinate Sys-tem, 1980 Xi′an Coordinate System and China Geodetic Coordinate System 2000 is presented in this paper.The GeoTIFF, DXF and Arc /Info Binary Grid are dominant file formats for storing DOM、DLG and DEM data, and most of GIS platforms support this formats. Based on the analysis of the file structure, a toolkit for coordinate system conversion is developed under platform VB6.0.The toolkit directly reads and modifies coordinate information of the data file and is independent of the existing GIS and Mapping related software products.The experimental and practical operations validates the efficiency and accuracy of coordinate conversion.%详细介绍了3D产品（ DOM、DLG、DEM）在1954北京坐标系、1980西安坐标系、2000国家大地坐标系之间的相互转换。3D源数据包括以GeoTIFF格式为代表DOM数据、以Autodesk公司的DXF文件为代表的DLG数据和以Arc／Info Binary Grid格式为代表的DEM数据。本系统以VB6．0为平台进行开发设计，通过解析各数据文件的文件结构，直接定位、修改数据文件的坐标信息，该系统独立于现有GIS及测绘相关软件产品，数据处理快速，转换效率高，能够比较精确地实现小区域的坐标转换。