
Laser scanning as a surveying method is used to generate complex models of land and buildings. It collects data points that accurately measure objects and buildings, and can be used in different kinds of models and simulations. Laser scanning uses cloud point data or 3D data points. These data points help engineers capture the detailed and accurate properties of an object. Scanning offers detailed information about an object’s size and shape, and allows that data to be transferred into a 3D digital model. The high level of detail and accuracy of laser scans allows engineers to create intricate and complex structure models without disrupting the site. Laser scanners can process massive amounts of data and easily share that data to help engineers and project managers design, visualize, and execute their projects.
First, laser scanners emit infrared light waves that reach out and touch the surrounding surfaces. Objects in the laser path then reflect the light back to the sensor. The sensor uses this information to determine how far away the object is. This is called, “time-of-flight” measurement. The time-of-flight measurement is calculated for every surface of the object. A laser scanner can collect millions of data points in just a few seconds. The distances measured on the structure are made into coordinates. When these coordinates are processed, they build a digital model of the spaces that were scanned. The model includes accurate dimensions, topographic features, and objects, providing a full scope of object data.
Laser scanning originated in the 1960s. Before their invention, land surveying was completed manually. Surveyors used tools like tape measures, plumb bobs, piano wire, and laser range finders. Surveying land could take weeks or months, depending on the size and complexity of the project. Manually collecting data often lead to errors and missing data, resulting in project issues and increased costs. Once laser scanners were introduced, the equipment consisted of lights, cameras, and projectors. During this time, the data was still manually processed. The introduction of LiDAR systems in 1985 changed the way data was collected. LiDAR systems used high-quality laser beams and shadowing to generate accurate and impactful data.
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Laser scanning is utilized by many different industries, like construction, archaeology, and even medicine. Some of its other real-world applications are listed below.