LiDAR and 3D laser scanning are two advanced tools that are used for gathering accurate data about physical locations. The primary distinction is that 3D laser scanning means precise, high-accuracy scanning for structures, railroads, and industrial sites, whereas LiDAR usually refers to airborne or vehicle-mounted scanning for large areas. To put it simply, LiDAR scans large areas, while 3D laser scanning takes more detailed pictures of smaller areas.
Let's examine the difference between LiDAR and 3D laser scanning.
Purpose and Application: Big Areas vs Detailed Spaces
LiDAR stands for Light Detection and Ranging. It is generally used when you have to swiftly cover a lot of ground. For instance, LiDAR is used to map large roadways, fields, mountains, and forests. Typically, the 3D scanner is installed on automobiles, aircraft, or drones. It shoots laser pulses and measures how long they take to bounce back. This builds a map of the land below.
However, if you need detailed scans of buildings, bridges, tunnels, or railroad tracks, then 3D laser scanning is the best option. For railway engineering, the experts at Apex Engineering Services use 3D laser scanning technology for the most precise results. Small details like tunnel designs, overhead cables, and track alignment are captured by their crew. Because of the high level of accuracy required for this operation, 3D laser scanning technology is more effective than LiDAR in these situations.
LiDAR vs 3D laser scanning often comes down to the scale and detail you need. LiDAR makes sense if you want to map an entire city or forest from above. Thus, 3D laser scanning is a better tool if you need to scan a bridge or station platform down to the millimetre.
Accuracy: Which One is More Precise?
The degree of detail is a significant consideration when comparing LiDAR and 3D laser scanning. Although LiDAR gathers thousands of points per second, the quality of the data is worse. It works well for observing the shapes of hills or a system of roads. However, engineers require extremely comprehensive information in order to assess the angle of a railway track or spot cracks in a tunnel wall.
Apex Engineering Services' 3D laser scanners use advanced 3D laser scanning technology to record millions of points with an accuracy of up to ±3 mm. This implies that they are able to provide survey-grade scans that follow strict rail requirements. This is why 3D laser scanning is trusted for sensitive jobs like canopy gauging or checking clearances around tracks. For these little but significant features, LiDAR would not provide that level of information.
Most importantly, if you are interested in knowing how 3D laser scanning is efficient for retrofitting projects, then read our full article on Leveraging 3D Laser Scanning for Efficient Retrofitting Projects.
Data Output: Big Pictures vs Detailed Models
LiDAR gives you large maps with numerous ground points. Planners can use these maps to determine the height of trees, the flow of rivers, and potential locations for new roadways. Although the data is not always ready for use in CAD software, it is useful for large planning jobs.
In contrast, high-definition point clouds from 3D laser scanning can be converted into distinct 3D models. When comparing LiDAR vs 3D laser scanning, engineers and designers can utilise the CAD-ready outputs that Apex Engineering Services provides. These detailed models fit perfectly into BIM systems. Just because of this, teams can more easily plan updates, review designs, and prevent errors before work.
Ease of Use: Remote Scanning vs On-Site Detail
LiDAR is quick and can cover a large area without people. It performs effectively in difficult-to-reach locations, such as steep slopes or woodlands. LiDAR in construction is also useful because it helps scan large sites with ease. However, LiDAR equipment finds it difficult to reach every corner or confined location, such as inside buildings, bridges, or tunnels.
This problem does not exist with 3D laser scanning. Portable scanners that can be carried to any location on a site are used by AES engineers. They spend less time on site since the scanners operate quickly. The crew frequently finishes tasks in a single visit, which keeps passengers safe and minimises interference with train schedules.
Additionally, clients can use cloud viewers to view the results remotely. When comparing the difference between LiDAR and 3D laser scanning, 3D laser scanning is more adaptable for detailed work because of its combination of on-site accuracy and easy sharing.
Cost: Broad Coverage vs Value for Detail
LiDAR first appears to be less expensive for large areas. Hundreds of square kilometres can be scanned in a single trip. This makes LiDAR in construction very helpful when covering wide sites like highways or city blocks. However, LiDAR is not cost-effective when you simply need high-detail data for a short area. Even if the flights and equipment are expensive, they might not provide the necessary accuracy.
Apex Engineering Services' 3D laser scanning reduces site time and the need for follow-up visits resulting in cost savings. The first time, the scanners collect all the data. This eliminates the need for engineers to come back for more measurements. Clients receive trustworthy, clear 3D models. Over time, this lowers errors, redesigns, and delays.
Therefore, even though both approaches are expensive, 3D laser scanning is a preferable option for tasks in which you require a lot of information.
What are the questions that people have for Apex Engineering Services?
What is the main difference between LiDAR and 3D laser scanning?
The main difference between LiDAR and 3D laser scanning is that LiDAR is usually used for large outdoor areas like forests or roads, while 3D laser scanning is better for small spaces that need very detailed measurements, such as buildings, tunnels, or railway tracks.
Which one is more accurate, LiDAR or 3D laser scanning?
3D laser scanning is more accurate when it comes to capturing small details. LiDAR covers big spaces fast but does not show fine features as clearly as 3D laser scanning does.
Where is LiDAR mostly used?
LiDAR is mainly used in mapping landscapes, forests, coastlines, and large road networks. It helps planners see the shape of the land from above.
Can LiDAR and 3D laser scanning be used together?
Yes, sometimes both are used on the same project. LiDAR gives a broad view of the whole area, while 3D laser scanning adds precise details for parts that need close checks, like buildings or tunnels.
Is LiDAR or 3D laser scanning better for building models in CAD or BIM?
3D laser scanning is better for creating clear, ready-to-use models in CAD or BIM software. The data is more detailed and easier for engineers and designers to work with.
Conclusion:
Engineers can better understand the world with the use of LiDAR and 3D laser scanning. However, they do different tasks, and knowing the difference between LiDAR and 3D laser scanning helps choose the right method. Large, open areas where detail is less crucial are ideal for LiDAR. Smaller, more complicated areas where every millimetre matters are ideal for 3D laser scanning.
3D laser scanning is the best option for elaborate constructions, tunnels, and railway engineering. Apex Engineering Services demonstrates how this approach provides the appropriate data in a timely, safe, and cost-effective manner. Every time your project requires precision and accurate planning then reach out to Apex Engineering Services.