4 Factors That Can Affect the Accuracy of GPR

As a leading provider of professional underground services in Manhattan, NY, GPR One Call understands that Ground Penetrating Radar technology is regarded as something of a silver bullet when it comes to locating underground private utilities. Its accuracy in pinpointing locations of underground objects like pipes, rebar, and more surpass other technology currently on the market. Because of this, surveyors and contractors to avoid have been able to prevent damage to underground utilities.

However, like any “ground-breaking” technology, there are certain factors that alter its effectiveness. Check out this infographic for a brief look at these circumstances, and continue reading to learn even more about how GPR One Call can help you and your next project.

Soil Condition

For transmission to take place, magnetic and electrical waves must continuously be interacting with one another. This interaction makes it possible to send a high-frequency wave through the ground, and then transmit the reflected wave back up to the surface. The composition of the soil on site will have a direct effect on how accurate the GPR reading will be. For example, if the soil has high levels of minerals, soluble salts, or has a high saline content, then the accuracy of the GPR can be obstructed.

Background Noise

The electromagnetic energy used by GPR has the same frequencies as those used for radio and television bands. If the surveyed area has a strong presence of those types of frequencies, that “noise” can distort the results of the GPR.

Weather Conditions

Since moisture raises the conductivity of the ground (especially clay soil and silt), heavy precipitation can affect the reading. Once the radar touches ground retaining moisture, the signal bounces right back, making it difficult to read anything below the water table.

Technological Limitations

Since metal is an extremely conductive material, it is easy to locate with GPR technology. On the other hand, plastics and PVC have no conductivity and are much more difficult to locate accurately. If lines are too small, the radar may have trouble picking it up. Another limitation could be an antenna’s limited capability and not finding objects too deep beneath the surface.

Anomalies present on the survey site may lead to capturing inaccurate results. A high degree of professionalism and expertise is needed to ensure the ground is prepared before taking the readings, allowing a GPR expert to garner the correct results. 

If you require a GPR contractor or the services of a professional concrete floor scanner in New Jersey, contact GPR One Call today!