GNSS Survey Planning

Play an AI-generated podcast conversation about this lesson

What is the ideal minimum distance from obstructions above the horizon for a GPS station?

15 degrees

In the absence of ideal sites, what is the minimum distance required from obstructions in one quadrant of the GPS station visibility plot?

10m

What should be included in field sheets when collecting GPS data?

Station name, antenna ht., receiver serial no., measured to, antenna type, etc.

What should be indicated when measurements are taken with an antenna?

Where measurements were taken Signup and view all the answers

What is the purpose of a skyplot in GPS surveying?

To visualize and assess obstruction of the GPS signal Signup and view all the answers

What is Geometric Dilution of Precision (GDOP) in GPS surveying?

A measure of the effect of satellite geometry on GPS accuracy Signup and view all the answers

What is the recommended method to measure the height of a station in a GNSS survey?

Measure heights before and after observation to the nearest millimeter using a plumb bob or optical plummet. Signup and view all the answers

What is the importance of synchronizing receiver settings in a GNSS survey?

To ensure consistent data collection, all receivers must have the same settings for elevation mask, sync rates, SV enabled or disabled, and data formats. Signup and view all the answers

What precaution should be taken when collecting GNSS data to avoid signal interference?

Avoid using electronic devices within 10m of the GNSS receiver to prevent signal interference. Signup and view all the answers

What is the recommended approach when collecting GNSS data at stations with obstructions?

Longer observation times are advisable at stations with obstructions to ensure reliable data collection. Signup and view all the answers

What is the purpose of a GNSS survey field data sheet?

To record and organize GNSS survey data for post-processing and analysis. Signup and view all the answers

What is the importance of using a plumb bob or optical plummet in GNSS surveying?

To measure the height of a station to the nearest millimeter and ensure accurate data collection. Signup and view all the answers

What is the minimum number of GPS receivers required for a GNSS survey?

2 Signup and view all the answers

What is the recommended observation time for a GNSS survey?

Minimum 2 sessions per station with at least 1 hour per session Signup and view all the answers

What is the purpose of performing a reconnaissance and monumentation?

To gather information about the project area and plan the survey Signup and view all the answers

What is the purpose of importing and checking observation information?

To ensure that antenna heights, station names, and other metadata are accurate Signup and view all the answers

What is the purpose of performing a network adjustment process?

To adjust the GPS baselines and ensure accurate results Signup and view all the answers

Why is it important to use sufficient existing controls in a survey?

To increase the accuracy of the survey by using existing controls distributed outside the project area Signup and view all the answers