San Jose Navigation GPS Mobile Locator GM-158-USB Manual de usuario descargar pdf (Pagina 29)

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7 Using the Easy Locator

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In some cases GPR is a stand-alone method that can solve a particular

locate problem. An additional bonus of using GPR beyond detecting non-

metallic objects is the ability to scan large areas and detect many unknown

utilities at one time without prior knowledge of their locations or directly

connecting to them.

When locating utilities, plan the survey in accordance to Figure 4.1. Start

with a number of scans perpendicular to the area with the expected utility.

Do a number of scans to get a correct picture of the signature. Follow up

with parallel scans to search for laterals if needed.

Fig. 4.1 Example of a survey plan.

Place the Easy Locator on the start of the first profile; choose the start

button and start the measurements.

It is possible to change the settings while you are scanning to get the most

suitable screen.

When you find a signature of a utility to be marked showing up on the

screen, continue measuring until the full signature can be seen on the

screen and then walk backwards. When the vertical marker (seen on the

radargram window) is in the middle of the signature, draw a mark on the

ground beside the arrow on the antenna.

Normally, a numbers of scans have to be made to ensure the existence

and extension of the utility. The last signatures can be retained on the

screen by lifting the back wheels when moving the Easy Locator in position

for the next scan. This way a comparison between the different scans can

be made directly on the screen. This can be done if the measured profiles

are short, as the space on the screen is limited.

Area with expected utility

Parallel survey lines

Perpendicular

survey lines

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San Jose Navigation GPS Mobile Locator GM-158-USB Manual de usuario Pagina 29