NET的“NET”映射组件的作者解释了如何编写能够显示地理坐标的地理映射引擎。提供源代码可以平移和缩放样本的地理对象（Nebraska州），在C #和VB.NET。(In part three of the series, the authors of the "GIS.NET" mapping component for .NET explain how to write a geographic mapping engine which can display geogr