文中对王家大院周围图根gps网的建立作了简介，对技术原理及数据指数进行说明。
The article introduces the example of establishing GPS net of diagram root surrounding Wang's Grand Courtyard, explains the technical principle and data index, and talks about the experience.
根叔到老王家时，正乱成一锅粥。
Uncle Gen arrived at Old Wang's house to see everything was in a mess.
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