有关硬件设计的资料，对于刚接触硬件设计的人有一定指导意义。-Information about hardware design, hardware design for the new to people who have a certain significance.

此文档是美国航天局发布的针对其三维GIS软件开源代码WorldWind的设计思路指导，供WorldWind新手使用。 -This is a guide for World Wind，released by NASA ,which is much beneficial for green hands.