NTv2格网法在空间数据坐标系转换中的应用——以河北省自然资源数据为例

Application of NTv2 grid method in transformation of spatial data coordinate system--Taking Hebei province’s natural resources data as an example

格网法是一种非常精确的坐标转换方法,有多种转换模型。NTv2格网法是基于国家层面的格网法坐标转换模型,在国际上广泛流行,但在我国却没有得到很好的应用。本文简要介绍了NTv2格网法坐标转换的基本原理,剖析了ArcGIS软件支持的NTv2格网改正量文件结构及制作方法,并以河北省自然资源数据坐标转换为例,对转换过程及转换精度进行了分析。

The grid method is a very precise coordinate transformation method.There are many kinds of transformation models,among which NTv2 is a very popular one in the world.The grid method coordinate transformation model based on national level has not been well applied in China.This article briefly introduces the basic principles of the coordinate conversion of the NTv2 grid method,analyzes the structure and manufacturing method of the NTv2 grid correction amount file supported by ArcGIS software,and uses Hebei province’s natural resources data coordinate conversion as an example to carry out the conversion process and conversion accuracy analysis.