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Grid Scan
Figure 7-6: Forming a right-angle triangle
Step 3 – Mark the Line Start Positions – with the tape measure still on the ground, mark the
line start positions based on the line spacings (Figure 7-7). Usually flags or paint work for
grass, and chalk or paint on concrete. It is also recommended to paint a distance measurement
every so often, in case you forget which line you're on.
Figure 7-7: Marking the starting positions for every line
Step 4 – Mark the End Positions – if you are doing a forward only grid, it is recommended to
mark the end positions (Figure 7-8). You will need to aim for something to make sure your line
is straight. The end positions don't have to be the exact length of the line (as the GPR will stop
when the set distance is reached), but just something to aim for.
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