How to Interpret and Understand GPR Scan Data

CNI IS HERE TO HELP

Among various means of detecting underground utilities and structures, GPR scan technology can be branded as the most viable method. Ground Penetrating Radar (GPR) is a technique that utilizes radio waves for detailed imaging of what lies sub-surface. It’s one of the common means employed for construction works, utility locating, and environmental studies.

Nevertheless, characterizing and interpreting GPR scan data involves some degree of skill and experience. Here, we present a simple guide that will enable you to grasp the basics of GPR scanning.

What is GPR Scan Data?

An electromagnetic wave is transmitted into the ground, and the reflected signals are measured to create images. When the signals hit various underground materials—like metal, concrete, soil, or plastic—they reflect back to the surface. The data collected are then radar-image-displayed, showing different layers in the scanned area and objects.

The images usually show waveforms, hyperbolas, or horizontal lines, which represent various materials or voids. Metallic objects will generally produce strong reflections, while non-metallic objects will generally give weaker signals.

How to Read and Interpret GPR Scanning Data

With the interpretations of GPR data, you should understand the patterns and discern among these reflections. Here are some important points:

1. Identify Hyperbolas:

Hyperbolas are the most often seen shapes in GPR scan images. Point-like objects, such as pipes, buried cables, or small items, usually create such hyperbolas. The size and shape of hyperbolas help to find the depth of the object in the ground and its type of material.

2. Distinguish Between Materials:

Signals are reflected differently by different materials. Generally, metals produce strong reflections, while concrete, soil, or plastic produce weaker reflections. The experts differentiate these materials from their strength and pattern of reflection.

3. Analyze Layers:

Changes in soil layers or concrete slab surfaces are indicated in the scan data with horizontal lines. It is useful to know these layers for locating utilities or assessing structures.

4. Cross-Referencing Data:

The method improves accuracy multiple times. Cross-checking data from GPR locating affirms the presence of specific objects, thus reducing the possibility of overlooking important details.

Why Professional GPR Scanning Matters

GPR data interpretation of fundamentals is easy to understand, but the judgment of experienced technicians is required in complex situations. The application of special software and knowledge of underground structures allows skilled technicians to provide results that are highly accurate. Misinterpretation causes construction or excavation-related damages, delays, and safety issues.

Rely on C-N-I Locates for Accurate GPR Scanning Services

At C-N-I Locates, we specialize in expert GPR scanning and locating services for underground utilities and structures. Our experienced team of professionals is equipped with the latest equipment and proven techniques for the effective interpretation of GPR scan data, saving customers from costly mistakes and unsafe job activities. Therefore, contact us today to set and schedule your GPR scanning services.

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How to Interpret and Understand GPR Scan Data