San Jose Navigation GPS Mobile Locator GM-158-USB Instrukcja Użytkownika Pobierz pdf (Strona 33)

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Fig 5.3 Example of backfill over a concrete sewer line.

The concrete sewer line in the middle is large enough to leave a signature

from both the top and the bottom of the pipe. A close look also shows that

the radius of the signature is larger compared to the water pipes to the left.

This indicates that the object has a larger diameter. Also, a signature from

the sides of the trench can be seen. When a trench is made, this changes

the properties in the ground (even if it is re-filled with the same original

material and will therefore be noticed by the system. The cable on the right

side shows up with a signature with a smaller radius. The sharper, more V-

shaped signature is a typical sign of a smaller diameter object. The above

“rules” can be verified by the following examples:

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San Jose Navigation GPS Mobile Locator GM-158-USB Instrukcja Użytkownika Strona 33