Surveying techniques are essential for different stages of a construction project. For instance, ground-penetrating radar is a utility mapping technique that determines the location and depth of utilities such as water pipes, gas pipes, electrical lines, etc.

In this blog, we will take a look at two advanced surveying techniques; 3D scanning and ground-penetrating radar survey. These procedures employ highly sophisticated technology to map different aspects of our environment.  For example, GPR works on sub-surface environments, while 3D mapping captures millions of data points for a 3-dimensional image.

3D Scanning

3D scanning is an accurate and reliable land survey method that has a wide range of applications.  Engineers, surveyors, and scientists employ 3D scanning technology in mining, civil surveys, virtual designs, application development, and archeological projects.

How does 3D scanning work?

3D scanners contain complex devices that map out cloud data points. In the device, there is a transmitter, photodetectors, GPS, Inertial Measurement Systems (IMS), and other advanced sensors. It works by sending beams of light to different data points. The 3D scanner measures the time it takes for the laser light to travel back to the photodetectors. The device can also measure the deviation in the reflected angle.

A 3D scanner does complex calculations for all the data points it captures in space.  The device captures millions of points (in mere seconds) that are interpreted by dedicated software to form a spatial image of the 3-dimensional environment.

Advantages of 3D scanning

Ground-penetrating Radar Survey

Ground-penetrating radar surveying is a non-invasive procedure for mapping sub-surface structures, objects, and utilities. A GPR device uses electromagnetic waves to determine the location and depth of objects buried beneath the earth.  It sends pulses of radio waves through a transmitter and receives the reflected waves or echoes through a receiver.

You should know that different materials have different densities and electrical conduction properties that affect how the waves will be absorbed, reflected, and refracted. The GPR software uses dedicated software to develop images of the sub-surface structure.

GPR survey is essential to utility mapping or location services.  The device is capable of identifying or recognizing metal, plastic, concrete, PVC, and other organic materials. Engineers use it to determine and detect the location of underground utilities and pipes, changes in strata,  air pockets, backfilled areas, bedrock, groundwater tables, etc.

Projects that require ground penetrating radar In NYC entail excavation projects, bridges, mining, buildings, etc.