Based on the practice of high-grade highway tunnel GPS survey, establishment and data processing method for independent coordinate system of tunnel GPS control network are introduced in the paper.

本文根据生产实践，介绍了高等级公路隧道GPS控制网的建立及用于施工坐标系的数据处理方法。

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The Establishment Survey collects data from more than 141, 000 businesses and government agencies.

FORBES: Why Jack Welch Has A Point About Unemployment Numbers

Besides the transparency issue in the SA process (which can lead some to the manipulation conclusion) which the BLS could easily remedy simply by publishing the changed data on a monthly basis, the Establishment Survey suffers from a significant upward bias, known as the Birth-Death model.

FORBES: Why Jack Welch Has A Point About Unemployment Numbers