基于Global Mapper的测绘图形数据转换

Global Mapper支持多种格式的光栅、高程、矢量数据的读取与输出，并内置多种坐标投影方式。尝试挖掘其支持多种数据格式、多种投影模式的功能，快速实现测绘图形数据的转换。通过设置当前工作空间的坐标投影模式，然后打开任何其支持的、含有坐标投影信息的数据，所有数据均自动转换成当前的投影模式，最后将文件输出（另存为）为所需的格式，即可快速完成数据转换。转换的内容主要包括不同格式的DTM(Digital Terrain Model，数字地面模型)数据转换、相同格式但不同坐标投影之间的相互转换，以及卫星影像配准等

Transformation of mapping graphic data based on Global Mapper

The software Global Mapper can read and export many types of data formats including grating, elevation and vector data, and support various coordinate projection methods. This study exploited its powerful functions of supporting various data formats and projection models to realize rapid data transformation. By setting appropriate projection models of the current workspace, and opening any data format it support and that contains projection information, all data can be automatically converted into the current projection model. Then, we can export the data to the needed format, and the translation is achieved. This includes conversion between different formats of DTM data, that with the same format but different coordinate systems, and the Mosaic registration of satellite images.