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4 Before Leaving the Office<br />

4.1 Introduction<br />

4.2 Planning<br />

This chapter explains what to do before you take the Asset Surveyor<br />

software out into the field.<br />

Obtaining the desired accuracy requires good planning. The Quick<br />

Plan software lets you plan the best times to collect GPS data. The<br />

following information is useful when planning for data collection:<br />

The number of visible satellites<br />

Where the satellites travel<br />

The PDOP (Position Dilution of Precision)<br />

The more satellites that are visible, the better. PDOP provides an<br />

indication of the expected accuracy of your GPS positions based on<br />

the relative positions of the satellites. Lower PDOP values provide<br />

more accurate data.<br />

38 TSC1 Asset Surveyor Operation Manual

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