A New Era of Wide-Area Surveying Opened by 200 m LiDAR Point Clouds

Table of Contents

• Introduction: What Are Wide-Area Surveys and LiDAR Point Clouds

• Challenges in Conventional Wide-Area Surveying

• New Possibilities Opened by LiDAR That Reaches 200 m

• Marker-Free 3D Measurement via GNSS-RTK Integration

• Efficient 3D Scanning in Complex Terrain and Urban Areas

• High-Resolution Point Cloud Data and Cloud Utilization

• What the New Era of Wide-Area Surveying Brings

• Simple Surveying Anyone Can Do with LRTK

• FAQ

Introduction: What Are Wide-Area Surveys and LiDAR Point Clouds

In recent years, there has been growing demand across fields such as infrastructure inspection, disaster prevention, and construction planning for accurately and efficiently surveying large areas. Wide-area surveying, as the name implies, targets large-scale terrains and structures, requiring different challenges and methods than conventional localized surveying. A technology that has drawn attention in this field is three-dimensional measurement using LiDAR.

LiDAR is a technology that measures the distance to objects by emitting laser light, and its measurement results are obtained as a collection of innumerable points (point cloud data). Each point in a point cloud contains data such as X, Y, and Z coordinates and return intensity, allowing extremely detailed recording of the shapes of objects and terrain. For example, it can reproduce surface undulations and building shapes in three dimensions as if they were physically present. With point cloud technology, it has become possible to create whole-site 3D models for analysis and record-keeping.

Recently, simple LiDAR sensors have even been integrated into smartphones and tablets, making it increasingly easy for anyone to acquire point clouds. However, the effective range of mobile-device LiDAR is only on the order of a few meters, which is insufficient for wide-area surveying. Enter high-performance LiDAR capable of laser scanning targets at distances of up to approximately 200 m (656.2 ft). This 200 m LiDAR point cloud technology makes possible wide-area 3D surveying that was previously difficult, ushering in a true new era.

Challenges in Conventional Wide-Area Surveying

Traditional wide-area surveying methods have had several major challenges. First, when using ground-based 3D laser scanners to cover large areas, devices must be moved and reinstalled repeatedly to cover the region little by little, which is extremely time-consuming and labor-intensive. In addition, to stitch acquired point cloud datasets together into a single coordinate system, targets or markers had to be installed on site in advance, and later used as references to align (register) the point clouds. For example, to create a point cloud of a large slope or an entire bridge, scanners must be used at many locations, and survey instruments must be used to measure the absolute coordinates of the markers; only then can coordinates be assigned to the point clouds back in the office. This workflow imposed a heavy burden on surveying teams.

Photogrammetry (3D reconstruction from drone aerial photos) is another option, but to reproduce a wide area with high accuracy you need many high-resolution photos, and processing those requires high-performance PCs and long processing times. Moreover, aerial photos cannot capture terrain information in areas hidden from above, such as under building overhangs or beneath trees. As a result, obtaining wide-area 3D data required large amounts of manpower, time, and equipment, and data processing and integration demanded specialist skills. These traditional challenges raised the barrier to wide-area surveying.

In summary, conventional wide-area surveying suffered from the following problems:

• Need to survey from multiple locations: To cover wide areas, equipment must be moved and reinstalled repeatedly, making fieldwork time-consuming.

• Effort for marker placement and alignment: Targets must be placed and reference points measured with surveying instruments to merge point clouds into absolute coordinates.

• Data processing burden: Processing and integrating large amounts of point cloud and photographic data requires high-performance PCs and specialized software, and takes time.

• Risk of missed measurements: When surveying large areas, it can be difficult to confirm on site that all regions were properly measured; upon return, missing data may require re-surveying.

• Dependence on specialized skills: Operating advanced equipment and processing data requires expertise, forcing reliance on a limited number of skilled technicians.

New Possibilities Opened by LiDAR That Reaches 200 m

A solution that dramatically addresses the issues above is point cloud measurement using long-range LiDAR. In particular, the emergence of LiDAR scanners with 200 m-class ranging performance has brought new possibilities to wide-area surveying. Extending the measurement range from less than 100 m to about 200 m changes how wide areas and large structures are surveyed in the following ways.

• Significant expansion of measurement range: Because the laser reaches up to 200 m (656.2 ft), structures at height and large sites can be measured from a distance in a single pass. For example, long-span bridges, dams, and hillside slopes can be covered with fewer equipment setups.

• Safe measurement of hazardous areas: Slopes at risk of landslides or equipment over busy roads can be measured from safe, remote locations. This allows both worker safety and expanded survey coverage.

• Improved work efficiency: Covering longer distances reduces the need to reposition equipment, shortening on-site survey time. With fewer equipment moves on large sites, the amount of point cloud data acquired in a single day increases dramatically.

In practice, using the latest 200 m-capable LiDAR can enable acquiring point cloud data for several hectares of land in as little as about one hour. This represents an overwhelming speed-up compared to traditional methods. The expanded measurement range provided by long-range LiDAR is having a major impact on wide-area surveying practice.

Marker-Free 3D Measurement via GNSS-RTK Integration

Another revolutionary technology for improving wide-area surveying efficiency is the integration of GNSS-RTK (Real-Time Kinematic GPS). By incorporating a high-precision RTK-GNSS receiver into a long-range LiDAR scanner, it has become possible to attach absolute coordinates (global coordinates) to point clouds instantly without markers.

RTK-GNSS is a technology that corrects satellite positioning errors in real time to achieve positioning accuracy on the order of several centimeters (cm level accuracy, half-inch accuracy). Combining this with LiDAR measurement means that high-accuracy position information is attached to each point at the moment of scanning. Traditionally, after point cloud acquisition one had to match reference points and perform registration of multiple scans, but RTK-integrated LiDAR means the point cloud data acquired on site already have absolute coordinates attached.

The advantages are immense. First, teams are freed from the troublesome task of marker placement. There is no need to place targets on site in advance or to measure their positions with surveying instruments, greatly reducing preparation time. In addition, the post-process step of aligning point clouds acquired from multiple locations in software becomes unnecessary. Because RTK ensures global coordinates are always determined, separately acquired point clouds automatically overlap with the correct spatial relationship. As a result, uploading acquired data to the cloud, for example, is sufficient for the wide-area point clouds to be automatically merged into a single dataset.

By integrating GNSS-RTK in this way, the workflow of wide-area surveying is dramatically simplified. On site, you just measure; post-processing is minimized, and high-accuracy survey results can be obtained quickly. Marker-free 3D measurement is a key factor in dramatically improving surveying productivity.

Efficient 3D Scanning in Complex Terrain and Urban Areas

The combination of long-range LiDAR and RTK is revolutionary not only for measurement range and accuracy but also for making surveying easy across various environments. Areas that were previously difficult to survey by drone or that have complex terrain can now be handled.

For example, in places such as slopes and forests where GPS signals are difficult to receive from above, or in urban areas with intricate ground-level structures where flying a drone is restricted or unsafe, drone-based measurement has been challenging. In such cases, a ground-based long-range LiDAR allows an operator to simply walk the ground and collect wide-area data. Using a portable handheld LiDAR device, operation is as simple as holding up the device and walking around. Because 3D scanning can be performed in urban areas and indoor spaces where drones cannot be used, the range of applicable surveying scenarios expands significantly.

Furthermore, systems that allow real-time verification of acquired point clouds provide the benefit of preventing on-site “missed measurements.” If point clouds are displayed sequentially on a tablet screen during scanning, one can check for unmeasured areas on the spot. If necessary, additional scans can be performed immediately, minimizing the risk of discovering missing data later. This is reassuring for less experienced operators and helps ensure consistent results regardless of who performs the measurement.

In short, the combination of long-range LiDAR and simple operation creates an environment in which efficient and reliable wide-area 3D surveying can be conducted anywhere from mountainous regions to urban centers.

High-Resolution Point Cloud Data and Cloud Utilization

With the ability to scan wide areas at high accuracy, both the quantity and quality of point cloud data obtained have improved dramatically. Because high-resolution point clouds can capture fine details even from a distance, thin structures such as bridge cables and power lines can be recorded without omission. Features that used to require close-range measurements can now be scanned from afar with long-range LiDAR, reducing data gaps and coarseness even in wide-area surveys.

However, high resolution also tends to produce very large point cloud datasets. Measuring wide areas can yield tens of millions or even hundreds of millions of points. Therefore, thoughtful approaches are needed for post-acquisition data processing and utilization. This is where cloud services excel.

Using modern surveying-oriented cloud platforms, large point cloud datasets can be safely stored and shared over the internet, and viewed and analyzed in a browser. For example, by uploading point clouds to the cloud, you do not need to bring a high-performance workstation to the field; you can check data from a tablet on site or continue processing on an office PC. Because point cloud display and measurement are possible with just a web browser without specialized software, the barrier to data utilization is greatly lowered. Sharing data with remote stakeholders for simultaneous review is also easy.

Moreover, cloud platforms increasingly offer advanced one-click processing such as AI-based automatic classification and point cloud merging. Tasks that used to be left entirely to specialist operators—such as editing point clouds, removing unwanted points, or extracting only ground surfaces—are becoming feasible with intuitive tools. In other words, advances in measurement sophistication and simplification of data processing are progressing simultaneously. By fully leveraging wide-area point cloud data from long-range LiDAR in the cloud, survey results can be applied to business processes with unprecedented speed and ease.

What the New Era of Wide-Area Surveying Brings

The new era of wide-area surveying—driven by 200 m-class LiDAR, RTK integration, and cloud utilization—not only represents technological progress but is poised to transform field workflows and business models.

First, reductions in time and cost for surveying are notable. If large-scale surveys that used to take several days can be completed in one day, labor and equipment costs shrink. Obtaining current-condition data in a short time allows earlier progress to design and construction phases, contributing to shorter overall project lead times.

Next, improvements in safety should not be overlooked. Remote measurement reduces the need for dangerous work at height or roadside surveys. Operators can control equipment from safe positions, reducing accident risk and strengthening safety management.

There is also a trend toward the democratization of surveying. Advanced measurement is no longer exclusively the domain of specialist surveyors; site supervisors, construction managers, and others who historically were not deeply involved in surveying are increasingly able to use these tools. If anyone can obtain high-accuracy 3D point clouds, on-site personnel can immediately measure and check areas of concern themselves. Such site-driven data collection will significantly promote DX (digital transformation).

Finally, the new era enhances the value of data. Detailed 3D point cloud data can be reused for many purposes once acquired: design verification, monitoring construction progress, as baseline records for maintenance, and before-and-after disaster comparisons. With surveying becoming quick and easy, organizations can build systems to “immediately understand site conditions in 3D when needed,” which is expected to dramatically improve the speed and accuracy of data-driven decision-making.

Simple Surveying Anyone Can Do with LRTK

As described above, the new era of wide-area surveying opened by 200 m LiDAR point clouds enables high-accuracy measurement with unprecedented ease and speed. One representative solution we offer is the LRTK series. LRTK is a surveying platform that combines GNSS-RTK and various measurement devices, pursuing simplicity so that non-experts can operate it.

Among them, the LRTK LiDAR is a handheld 3D scanner that integrates the aforementioned long-range LiDAR measurement and RTK positioning. This single device can perform laser measurements up to 200 m (656.2 ft), and the acquired point clouds are assigned position coordinates in real time with centimeter-level accuracy (cm level accuracy, half-inch accuracy). No complicated marker placement is required; simply holding and walking with the scanner allows rapid acquisition of wide-area 3D point cloud data. Thin power lines and high-elevation equipment can be reliably captured, and complex structures can be recorded without omission.

The LRTK series also considers data processing and sharing. Acquired point cloud data can be uploaded to LRTK Cloud, enabling handling without installing heavy software; viewing, measurements, and collaboration with stakeholders can be performed in a browser. Once scanning is complete on site, data can be immediately placed in the cloud and shared with internal and external team members to move to the next steps, greatly accelerating workflows.

In this way, LRTK fuses long-range LiDAR performance with modern cloud technologies to provide an environment where "anyone, anywhere, immediately" can perform high-accuracy surveying. In the new era of wide-area surveying, LRTK will be a reliable partner in promoting on-site DX.

FAQ

Q: What is LiDAR point cloud surveying? Why is it attracting attention for wide-area surveying? A: LiDAR (Light Detection and Ranging) is a technology that uses laser light to measure distances, and in point cloud surveying LiDAR acquires the surrounding 3D shape as a dataset of numerous points. It is attracting attention in wide-area surveying because it can measure large areas densely and quickly, and can accurately 3D-model complex terrain that is difficult to survey manually. LiDAR point cloud surveying is expected as a new surveying method because it efficiently acquires detailed terrain information that conventional surveying could not obtain.

Q: What advantages does LiDAR that can measure up to 200 m have over conventional equipment? A: Long-range LiDAR capable of reaching up to 200 m (656.2 ft) has the major advantage of measuring distant targets at once that previous devices could not reach. For example, it can measure the upper parts of tall buildings or entire bridges from a distance, reducing the number of equipment relocations. Because it eliminates the need to approach dangerous locations, safety is also improved. It allows acquisition of wide-area data in short time compared to multiple separate measurements, excelling in both efficiency and coverage.

Q: What is position coordinate assignment using GNSS-RTK? What does it mean that markers become unnecessary? A: GNSS-RTK is a technology that corrects satellite positioning errors to achieve centimeter-level accuracy (cm level accuracy, half-inch accuracy). Integrating RTK functionality into a LiDAR scanner allows high-precision position coordinates (global coordinates) to be assigned to each scanned point immediately. This eliminates the need to place separate targets (markers) and perform point cloud alignment tasks. In short, you no longer need to set up reference points or conduct post-processing to align point clouds; from the start, all point cloud data are directly tied to map coordinates.

Q: How should drone photogrammetry and ground LiDAR surveying be used differently? A: Drone photogrammetry has the advantage of capturing a wide area from above in one pass, but it has limitations in capturing parts not visible from above and in vertical accuracy. Ground LiDAR surveying is well suited to capturing ground surfaces and structural details with high precision. The two methods are complementary: use drones to get an overview of wide areas and ground LiDAR to fill in details and blind spots. With RTK-integrated systems, drone and ground point clouds can be easily integrated in a common coordinate system, allowing combined use of both datasets.

Q: Isn’t processing and managing large amounts of point cloud data difficult? A: Traditionally, processing large point clouds required high-performance computers and specialist software, but cloud services have greatly simplified this. Uploading point cloud data to the cloud allows automatic integration and storage and access from anywhere via the internet. Basic operations like viewing in a browser and measuring distances or areas are possible. Because you don’t need to handle heavy data on your own PC, point clouds can be managed smoothly both in the field and in the office.

Q: Can people who are not professional surveyors operate this equipment? A: Yes. The latest LiDAR surveying equipment and services are designed for intuitive operation so that anyone can use them. With a handheld LiDAR, you only need to carry and walk with the device, and real-time guidance functions help prevent missed measurements. Many devices can be operated via smartphone or tablet, so people without special training can start using them after a short introduction. Cloud services also offer simple, button-driven UIs, enabling high-accuracy surveying results without specialized knowledge. The ability for anyone on site to utilize 3D data is a major feature of the new era in surveying.