Applying a Base Shift in Emlid Flow

This video will give a concise guide to applying a base shift in Emlid Flow to calibrate all further collected data in your survey project.

We are going to demonstrate the Base Shift function in Emlid Flow. For the Base Shift function to work correctly, we will need to have a known point or an established monument in or near our work area that we can reach with our rover. We create our New project in Flow 360, then import our known coordinate, which we’ve established using OPUS. In the field, we will set up our base in a clear area and let it average out a single solution.

Visualizing and Executing the Shift

To give a visual before and after, we are going to select the stakeout on our Known point and locate the actual point on the ground. Positioned roughly over our point, we can see we’re shifted more than 4 feet horizontally and 3 feet vertically. We’re going to level our rod, then measure this point.

With that point recorded, we will slide up the project window from the bottom, then select Base Shift. In the Base Shift screen, we will select the point we shot for the Measured point then select the Known point we started with. We will then see the calculated shift. Click Apply.

Now that the Base Shift is applied, we can see we haven’t moved the rover but now we have been shifted to the correct coordinates. We can also see in the Projects selection screen of Emlid Flow that the Base Shift is active.

Best Practices for Moving Forward

We’re good to go from here; our coordinates will now have a high degree of accuracy moving forward.

💡 Re-visitation Note: If we come back to this site later, we will need to remove our Base Shift and reapply it in the same way we did here.

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• Creating Custom Coordinate Systems and Localization in Emlid Flow
• Staking Surfaces in Emlid Flow