Surfacing

Setting the Search Radius manually
If the automatically generated search radius does not give the expected result, you can adjust it manually in the bottom left corner of the surfacing page. Consider the following when making an adjustment.
What the Search radius means
A Search radius is required to convert discrete elevation points into a continuous surface. At locations that were not directly measured, elevation is estimated from surrounding measured points. The search radius determines how far the surfacing algorithm looks for those points.
Effects of changing the radius
A search radius smaller than required leaves gaps in the surface. A radius larger than required normally has no visible effect on the resulting surface, but surfacing takes longer to complete.
In some cases, surface artifacts bridge sections of the field where you would not expect a surface, such as a pond or the inside corner of an L-shaped field. Choosing a smaller search radius can sometimes remove these areas. Their effect is normally limited, but they can affect your area and dirt volume records.
General sizing guidance
In general, use a search radius of about 2 times the swath width at which the data was collected. This sizing should keep the time needed to apply the surface short while using as much data as possible to generate a representative map.

Inline Offsets
Inline Offset, also known as Fix Lag, is a surfacing tool for correcting elevation data imported from other sources.
Open Inline Offset
Press Fix Lag at the left end of the tools at the bottom of the screen. This opens a pop-up window with options for correcting elevation alignment.
Video tutorial
For a YouTube tutorial on Inline Offset, visit https://youtu.be/O9Sgkx-DffM or scan this barcode with your phone.
Correct elevation alignment
As you correct elevation data in the pop-up window, the correction is shown on the data behind the window. Two separate sections in the pop-up control the correction.
Shift distance
Move the slider to control how far the data is shifted, or tap the text box in Shift distance to enter the distance manually. Both the slider and the manual Shift distance value have a maximum of 100ft (30m).
Pass separation
The lower portion of the window controls pass separation: the distance required between any point and the next point along before it is considered a new segment.
Check before accepting
Changes made in the Inline Offset window are reflected on the surface on the map. Check that your change has the desired effect before accepting.

Surfacing a survey also creates a design
Surfacing collected survey points creates a terrain model of the field’s original elevation. T3RRA also automatically creates a design surface that is an exact duplicate of this original elevation surface.
This duplicate provides a base layer to work from: T3RRA allows design surfaces in separate regions of a field, as well as design surfaces based on existing design surfaces.
Because a design surface is created automatically, you can go straight to implementation after surfacing even if you have not specifically created a design. Surfacing is normally automatic, so you can usually go directly from collecting to implementing. A design surface does exist, but it duplicates the original elevation surface, so the cut/fill map contains 0 values across the whole field.

Editing Survey Points
During surfacing, you can edit or remove survey and drain points using the selection methods below.
Select points
Select by Z
Use Select by Z to select elevation points by height.
Click Select by Z to display a graph of all your elevation data.
Click the two dashed lines and use them to wrap the data at the height you want to select.
Click Apply. The selection appears on the map in black.
Select by lasso
Use Select by lasso for a freeform selection.
Press down on the map and drag your finger around the data you want to edit. A blue dotted line shows what you are about to select.
Release your finger to select the data.
Select by circle
Select by circle selects everything within the circumference of the circle you draw.
Press down at the center of the circle and drag outwards. A blue dotted line shows what you are about to select.
Release your finger to select the data.
Select by path
Select by path will delete all consecutive points between point A and point B.
Press down at the point where you want to start and drag to an end point.
All points collected on that path between the two points will be selected when you release your finger.
Active selection and cancellation
While these selection functions are in use, their buttons display large red circles, indicating that deleting is active. Press the buttons to cancel selection and avoid accidentally selecting data while moving the screen or zooming.
After making a selection, you have two options: delete the points or change their height.
Deleting Survey/Drain Points
Click the Delete button that appears after you select points. The selected points are deleted immediately. Because this change is permanent, saving before you do this is recommended.
Changing height of Survey/Drain Points
Because this change is permanent, saving before you do this is recommended.
Click Modify Elevation to open the screen shown below.
Enter the amount to change the elevation by and click Apply.
Your data is updated immediately, and the change is visible on screen.
Video tutorial
For a YouTube tutorial on editing points, visit https://youtu.be/Q0581DSU7j4 or scan this barcode with your phone.