What is i-Construction? Construction Site DX Realized by Smartphone Surveying

In the construction industry, a wave of digital transformation (DX) is sweeping through. The productivity improvement project launched by the Ministry of Land, Infrastructure, Transport and Tourism in 2016, i-Construction, is at the center of this effort. i-Construction aims to introduce cutting-edge ICT (information and communication technology) across all processes from surveying to design, construction, inspection, and maintenance, with the goal of improving productivity on construction sites and reforming work styles. In the field of surveying in particular, a digital transformation from traditionally manual methods to smartphone surveying is progressing, becoming a key to on-site DX (site reform through digitalization). This article reviews conventional surveying methods and their challenges, explains what surveying DX means in the i-Construction era, and examines in detail the advantages brought to construction sites by a new surveying method that combines smartphones and RTK technology, as well as the deployment of 3D technologies such as point cloud data, as-built management, and AR utilization. Finally, we introduce how the smartphone surveying solution LRTK can contribute as a first step toward site DX and offer tips for adoption.

Definition and Background of i-Construction (Focused on the Surveying Domain)

i-Construction is a productivity revolution project for the construction industry promoted by the Ministry of Land, Infrastructure, Transport and Tourism. Announced in 2016 as the “first year of the productivity revolution,” it was positioned as a national policy to fully utilize ICT at construction sites to improve work efficiency and working conditions. The background includes issues such as a shortage of workers and aging in the construction industry. To continue infrastructure development with limited personnel, it was necessary to fundamentally review traditional methods and dramatically improve productivity.

There are several pillar measures of i-Construction, with a representative one being full utilization of ICT. This means introducing 3D data and automation technologies into each process—surveying, design, construction, inspection—to enable data-driven efficient construction. For example, in ICT earthworks, the use of 3D survey data from drones for as-built management and automatic construction using GPS-guided machinery is recommended. The adoption of such new technologies aims to digitalize and reduce the labor of previously manpower-dependent heavy work and complex procedures, transforming construction sites into more attractive workplaces.

Especially in the field of surveying, the DX effects of i-Construction are particularly evident. Surveying is an important task that supports quality from the start to the completion of a project, but it was also a bottleneck requiring significant manpower and time. Before i-Construction, on many sites surveyors and technicians had to carry equipment and rush around the site for everything from pre-construction surveys to in-progress as-built checks. With the promotion of i-Construction, 3D surveying using drone aerial photography and 3D laser scanners has begun to spread, enabling the acquisition and utilization of terrain data over wide areas in a short time. Improving the productivity of the surveying work itself leads to more efficient construction planning and faster as-built inspections, contributing to overall site optimization. In this way, i-Construction seeks to fundamentally transform workflows in the surveying field as well by actively adopting digital technologies.

Traditional Surveying Methods and Their Challenges

First, let’s look back at what traditional surveying methods were like. In conventional surveying, teams of multiple people used surveying equipment such as staffs (leveling rods), tape measures, levels, transits (theodolites), and total stations to measure site dimensions point by point. For example, for as-built checks in road construction, workers would manually measure pavement thickness, width, and elevation at key locations after work completion and compare them with design specifications. Measurement results were organized into as-built management charts and photo books and submitted for inspection by the client (government agencies, etc.). These procedures have been standard practice for many years, but the field has pointed out the following issues.

• High manpower and time requirements: Manual dimensional measurements require many personnel and long hours, imposing a heavy burden on site supervisors and survey staff. Experienced technicians are essential for surveying, but with a worsening labor shortage, it can be difficult to secure the required number of people and proceed efficiently within the construction schedule. In terrains with elevation differences or on large sites, repositioning equipment each time a survey point is moved is time-consuming and highly inefficient.

• Risk of overlooking due to lack of coverage: Because the number of points that can be measured manually is limited, conventional methods tend to rely on sampling representative points. As a result, it is difficult to fully grasp the entire construction area, and discrepancies from the design in unmeasured locations may be overlooked. The larger the structure or the longer the route, the harder it is for manual surveying to cover everything, increasing the risk of missing variations or local irregularities in as-built conditions. Being told at inspection that “some parts differ from the drawings” and having to rush to rework is a major stress for site personnel.

• Possibility of human error: Manual surveying and recording inevitably involve human mistakes. In busy sites, recording errors or forgetting to take photos can occur. For example, if the depth of buried piping is not photographed before being covered with soil, proof of the installation may be lacking later, potentially leading to rework or disputes. Mistakes such as misreading numbers transcribed from paper field notebooks during later processing can also happen. The traditional method’s reliance on “measuring only limited points” and “human manual recording” leaves concerns about accuracy and reliability, creating constant tension on site.

• Safety issues: Traditional surveying requires workers to enter the site and stand at measurement points. Measurements on busy roads or steep slopes, for example, inevitably involve dangerous work. When installing stakes or batter boards in areas where heavy equipment operates, there is a risk of accidental contact. In other words, as long as people must work on site for extended periods, the possibility of occupational accidents remains.

From these issues, calls for “more efficient and reliable surveying and as-built management methods” became louder on sites. Even before the start of i-Construction, research into GPS-equipped devices and photogrammetry was underway in some quarters, but these approaches had not yet been fully adopted on public works sites that require high precision. However, recently, with government support and technological advances, new surveying approaches that address these challenges are becoming feasible.

What Surveying DX Is — The Transformation Brought by Smartphones

Surveying DX is the fundamental transformation of surveying work through digital technologies. It does not merely digitize tasks (measuring and recording with electronic devices) but achieves a qualitatively different level of efficiency and data utilization, evolving the very role of surveying. With the promotion of i-Construction, DX in the construction industry has rapidly accelerated. Specifically, solutions such as BIM/CIM (use of three-dimensional design and construction information models) and 3D measurement technologies (high-density surveying with drone aerial photography and laser scanners) are spreading on sites. This has created a workflow that utilizes 3D data consistently from the design stage through construction and inspection.

For example, there are reports where a pre-construction survey that used to take a week was completed in about one day using aerial photogrammetry with drones. By automatically flying over the site and capturing images from above, then generating 3D terrain models through photo analysis, wide areas can be surveyed in a short time. In as-built management, utilizing point cloud data obtained by 3D laser scanners, etc., enables a surface-level (area-wide) grasp of a structure’s as-built condition, leaving no small errors unnoticed. The use of 3D technology is becoming the “new normal,” and the Ministry of Land, Infrastructure, Transport and Tourism has even drafted guidelines such as the “Procedures for As-Built Management Using 3D Measurement Technology (draft),” promoting the digitalization of inspection procedures.

However, the reality is that these advanced 3D surveying devices come with high costs and require specialized skills. Introducing high-performance laser scanners, dedicated drones, and GNSS positioning devices has been a high hurdle for small and medium-sized enterprises and many sites. What has gained attention in recent years is a new surveying approach using smartphones. Smartphones are ubiquitous devices, and inside them are cameras, accelerometers, and, in recent years, high-precision GPS chips—essentially a collection of sensors. By combining these smartphones with RTK positioning (high-precision GNSS positioning), which used to be achievable only with specialized equipment, solutions have emerged that can replace traditional surveying with palm-sized devices.

Smartphone-based surveying technology, being “cheap and easy” and “usable by anyone,” epitomizes surveying DX. Surveying used to be a specialized task requiring licensed surveyors or extensively trained technicians. But with the advent of smartphone surveying, site staff themselves can quickly perform surveys when needed and immediately share and utilize the data. Surveying DX is not only about making measurement tasks more efficient with digital technologies but about seamlessly linking the entire flow of measuring → recording → communicating → analyzing. The smartphone can serve as the platform for this, revolutionarily combining the roles of measuring instruments, notebooks, cameras, and communication terminals into a single device.

In short, surveying DX aims at the “democratization of surveying”: enabling anyone to handle high-precision data without relying on expensive equipment or specialists. The ubiquitous smartphone as a general-purpose device contributes greatly to realizing this vision.

Technical Overview and Advantages of Smartphone × RTK Surveying

An indispensable technology when talking about smartphone surveying is RTK-GNSS. RTK (Real Time Kinematic) is a method that applies correction information from a base station to satellite positioning (such as GPS) in real time to dramatically reduce positioning errors. Normally, a smartphone’s GPS alone yields only about 5–10 m (16.4–32.8 ft) of error, and vertical errors are especially large, making it unsuitable for precise surveying. However, with RTK, both the base station with known coordinates and the observation point receive satellite signals simultaneously, and by correcting those errors, RTK achieves precision comparable to surveying instruments—about ±1–2 cm (±0.4–0.8 in) horizontally and ±3 cm (±1.2 in) vertically. RTK technology itself has long existed and was common in surveying GNSS receivers, but dedicated equipment was expensive, bulky, and operated by specialists.

Recently, ultra-compact RTK-GNSS receivers for smartphones and tablets have been developed, enabling centimeter-level positioning easily. The overview of smartphone RTK surveying combined with a smartphone is as follows:

• Miniaturization of high-precision GNSS receivers: Prepare a pocket-sized RTK-capable GNSS device that can connect to a smartphone. It connects to the smartphone via cable or Bluetooth, and a dedicated app controls the device. This device receives multiple-frequency signals from satellites and obtains base station data (GNSS correction information) via networks.

• Correction computation by smartphone app: An app on the smartphone ingests base station data in real time and applies corrections to the raw positioning data from the GNSS device. In Japan, RTK corrections can use the Geospatial Information Authority’s GEONET electronic reference point network, commercial correction services, or augmentation signals from the Quasi-Zenith Satellite System “Michibiki” (such as CLAS). This instantly yields accurate coordinate values for the location.

• Displaying and recording results on the smartphone: Positioning results (latitude, longitude, height) are displayed on the smartphone screen in real time and can be recorded with one tap. Traditionally, data had to be transferred from surveying instruments to memory cards and processed on a PC, but smartphone RTK allows handling data on site. Recorded points can be named, assigned attribute information, and linked with photos and notes.

The advantages of smartphone × RTK surveying are numerous. Main points include:

• Centimeter-level high precision: It can achieve positioning accuracy comparable to dedicated instruments, making it suitable for public surveying and civil engineering as-built management. This enables checking precise positions and elevations required for surveying drawings and construction management using a smartphone. Especially with improved vertical accuracy, smartphone surveying can be used for elevation checks and layout marking for roadbeds and structures.

• One-person surveying: With just a smartphone and a small GNSS receiver, surveying can be completed by one person. For example, terrain surveys that traditionally required an operator for a total station and an assistant with a prism can be done by a single person with smartphone RTK. Mounting the smartphone and GNSS device on a dedicated telescopic pole (monopod) allows obtaining coordinates of the point directly beneath the pole on site. Height offsets (such as pole length) are automatically corrected by the app, so even inexperienced users can obtain accurate survey points with simple button operations.

• Portability and mobility: Smartphone surveying equipment is extremely compact and lightweight. The receiver body weighs on the order of a few hundred grams, and combined with a smartphone it is far lighter than conventional surveying instruments and fits in a small bag. This makes it quick to deploy in situations requiring mobility, such as remote infrastructure inspections or disaster-area surveys. Time from power-on to positioning is short, and preparation like leveling a tripod is unnecessary, making it possible to measure on the spot whenever needed.

• Significant cost reduction: Equipping a site with dedicated GNSS surveying instruments or 3D laser scanners can require hundreds of thousands of dollars in investment, but a smartphone RTK system can be introduced for a fraction of that cost. The ability to use existing smartphones or tablets is also economical. This makes high-precision surveying technologies accessible to small and medium-sized companies and municipalities with limited budgets. Cost reduction makes simultaneous adoption across many sites realistic and enables a new style of “one surveying tool per person.”

• Intuitive operation and low learning cost: Smartphone app GUIs are generally designed to be easy to understand and can be used intuitively by both younger and veteran staff. Conventional surveying instruments require familiarity with button operations and technical terminology, but smartphone surveying centers on simple operations like tapping on a map or selecting from menus. Even site staff who are not confident with PCs will find it less daunting, shortening training time. Becoming a “tool anyone can use” smooths promotion of DX across the entire site.

• Multifunction integration and data sharing: A unique strength of smartphones is seamless integration with functions beyond positioning. For example, one can take high-precision geotagged photos on the spot and record them, or save voice or text notes per survey point. Acquired data can be uploaded immediately to the cloud via mobile networks, making real-time sharing and consultation with office engineers easy. Digital unified management of survey data also facilitates later integration into CAD drawings or 3D models.

As described above, smartphone × RTK surveying combines high precision, low cost, and ease of use, upending conventional surveying norms. Without special equipment or expertise, “measuring, recording, and communicating” becomes possible for anyone—truly a technological innovation symbolizing on-site DX.

Use of 3D in i-Construction: Point Clouds, As-Built, AR, etc.

Another important point promoted by i-Construction is the utilization of 3D data. By fully leveraging high-precision digital data acquired on site, including smartphone surveying, construction management and quality inspection processes can be transformed. Below we look at use cases for point cloud data, as-built management, and AR (augmented reality).

● Visualization of the site with point cloud data: Point cloud data, obtained from drone photogrammetry or laser scanners, represents site terrain and structures in three dimensions as a collection of numerous measured points. Because wide areas can be scanned at high density in a single measurement, it is possible to grasp the surface shape of earthwork sites or to record the as-built details of tunnels and bridges. Point clouds are like a digital copy of the site’s “as-is” condition, so they are powerful for verifying as-built conditions against design data. They capture subtle undulations and distortions that might otherwise be missed, enabling early detection of construction errors. Point cloud data can be used in analysis software to freely extract cross-sections and longitudinal sections, or to automate volume calculations, allowing multifaceted utilization. i-Construction emphasizes improving efficiency in quantity and as-built management using point cloud measurements, and examples of using point clouds obtained by smartphones and drones are increasing.

● Digitalization and automation of as-built management: As-built management for public works has dramatically changed with 3D technologies. Traditionally, partial measurements with tape measures and levels were tabulated, but now 3D as-built management is gaining attention. Specifically, completed structures or developed land are 3D-scanned, and design models are compared with acquired point cloud data or high-precision photos to check for discrepancies. For example, to verify roadbed thickness, the road surface can be scanned over a wide area and converted to thickness, visualizing thickness distribution along the entire line. This can reveal locally thin areas that would have been missed by point-by-point measurement, enabling prompt corrective actions.

The Ministry of Land, Infrastructure, Transport and Tourism is revising as-built management procedures and preparing guidelines to support measurement methods using ICT. Point cloud measurements using smartphone × RTK align with the intent of these guidelines. By ensuring positional and elevation references through high-precision positioning and scanning whole structures with smartphone cameras or LiDAR, one can obtain as-built data that balance both “accuracy” and “density.” Software that automatically generates as-built management charts and 3D models from such data has emerged, reducing the burden of preparing inspection documents. If as-built management becomes fully digitalized, inspectors may be able to determine pass/fail remotely using data, and in the future prospects such as remote inspections and AI-based automatic checks may open up.

● On-site support using AR (augmented reality): AR technology overlays digital information onto real-world imagery. In construction, AR is being used to overlay drawings or BIM/CIM model information onto site imagery for intuitive verification and checking. For example, by pointing a smartphone or tablet camera at a site, the screen can display the outline of the design model or reference lines, allowing an immediate visual check of whether the actual structure aligns perfectly. This shifts site fitting work that relied on “intuition and experience” to data-based verification. The combination of smartphone and RTK makes AR even more practical. Because high-precision position information is obtained, AR display on site can align models and reality with an accuracy of several centimeters (several inches), enabling checks without misalignment. For instance, differences in design elevations can be displayed as color distributions (heat maps) in pavement works, or buried pipe locations can be marked on the ground visually—applications are varied. Complex rebar arrangements or bolt layouts can be checked like a see-through diagram with AR, making it easier for non-experts to judge construction quality. AR is also effective for on-site consensus building and training: showing a realistic completed form on a tablet deepens understanding in meetings with clients or in training new staff. In this way, 3D data × AR utilization contributes to i-Construction’s goal of “sites that everyone can easily understand.”

As described above, point cloud data, as-built management, and AR—3D technologies—become even more powerful when combined with smartphone surveying. A smartphone can serve not merely as a point-measuring tool but as a data hub for the site. The era is approaching in which capturing points with high precision (positioning), interpreting them as surfaces (point clouds), and overlaying them with design information for visualization (AR) can all be completed with a single smartphone and cloud service. This is the essence of construction site DX and represents the “productive and attractive site” i-Construction aims for.

Benefits of Introducing Smartphone Surveying (for Surveyors, Municipalities, and Site Managers)

The benefits of smartphone surveying and surveying DX extend to all roles involved on site. Here, focusing on professional surveyors, public project clients (municipalities), and site managers (construction supervisors), we summarize the advantages each can gain by adopting smartphone surveying.

Benefits for Surveyors

Professional surveyors and surveying companies may worry that smartphone surveying threatens their jobs. In reality, smartphone surveying can become a tool that supports and expands surveyors’ work. If routine simple surveys and site checks can be handled with smartphones, surveyors can concentrate resources on more specialized, value-added tasks (such as control surveys, precision alignment surveys, and analysis work). Through efficiency improvements, one surveyor can cover a wider area, enabling business expansion and improved services even amid labor shortages.

Also, because devices and apps for smartphone surveying are relatively low-cost, surveying companies can more readily equip sites with a full set of surveying tools. Even if dedicated equipment is limited in number, smartphone + small RTK devices make a “one-per-person” approach feasible. This allows tasks that previously waited for survey crews to be handled concurrently, speeding up the entire site. For example, if five survey team members each have a smartphone surveying tool, they can measure five locations simultaneously and finish quickly.

Furthermore, smartphone surveying deepens digital collaboration of survey data, evolving the role of surveyors. The traditional flow of measuring in the field, recording on paper, then typing and digitizing in the office is being replaced: data acquired on-site now immediately uploads to the cloud and reflects in office CAD software. Surveyors can verify and analyze results in real time and direct additional measurements on the spot. Increased immediacy and accuracy improve surveying quality and enhance trust from clients and designers.

Of course, adopting smartphone surveying tools requires learning new skills, but they are relatively approachable. Younger survey technicians, being used to smartphones, may even teach veterans. This contributes to technical succession within companies and is a good opportunity for organizational DX. Overall, smartphone surveying becomes a weapon to increase operational efficiency and service value for surveyors, enabling them to offer “chosen surveying” that meets contemporary needs.

Benefits for Municipalities (Clients)

There are substantial benefits for municipal staff who manage roads, rivers, and public facilities and for clients of public works. First is cost reduction and faster response. Municipalities regularly need surveys and measurements for infrastructure inspections and disaster damage assessments. Commissioning consultants or surveyors for every instance is time-consuming and costly, but if staff can use smartphone surveying tools, in-house processing can cut expenses and speed responses. For example, after heavy rain, a staff member could survey and photograph road damage on site and report the results the same day. In fact, some municipalities (such as Fukui City) have reported that introducing high-precision smartphone surveying systems (RTK-capable iPhones) for initial disaster recovery surveys allowed faster and more accurate mapping of damaged areas than before.

Another important aspect is inspection efficiency. In as-built inspections for public works, municipal staff (the client) traditionally attend site checks to confirm construction outcomes, but if contractors and the client share data via smartphones, the client can pre-check as-built data and identify points to raise in advance. On the inspection day, staff could use AR on a smartphone or tablet to verify key points more smartly. If younger staff familiar with DX handle inspections, more reliable and faster inspections than the old tape-and-paper style can be expected. Promoting DX on the client side is important to align with contractors: if contractors submit 3D data but the municipality cannot handle it and still requires paper prints, the result is a mismatch. Clients need to experience smartphone surveying themselves to deepen understanding.

Moreover, if municipalities utilize smartphone surveying, regional disaster prevention and infrastructure management capabilities improve. By setting up systems where staff, residents, and construction companies collaboratively record and share disaster-related information via smartphones, real-time, high-accuracy local information can be gathered for prompt decision-making. In normal times, staff or residents could measure playground equipment or potholes and report them immediately for timely maintenance planning. In the future, municipalities could build open infrastructure inspection databases led by the local government, enabling public participation via smartphones. Smartphone surveying is a tool for administrative DX and a strong ally for municipalities that must protect wide-ranging infrastructure with limited personnel.

Benefits for Site Managers and Construction Supervisors

For site managers and construction supervisors at construction firms, introducing smartphone surveying can transform daily site operations. Chief among benefits is the increased autonomy and responsiveness on-site. Traditionally, even if a manager thought “I want to measure here,” they often had to wait for the survey team, or they would make do with a quick tape measurement. If smartphone surveying equipment is kept on-site, managers themselves can measure immediately when needed and make decisions or give instructions based on the results. For instance, if there is doubt whether the foundation excavation depth matches the design, a manager can verify it on the spot with a smartphone and instantly instruct additional excavation or stop work. Real-time problem detection and resolution prevents rework and enables early resolution of quality issues.

There are also benefits for schedule management, which is a constant concern for site managers. With fewer delays waiting for surveying, instructions to foremen and heavy equipment operators can be more precise and data-driven. For example, instructing “dig another 5 cm (2.0 in)” is immediately actionable, reducing unnecessary coordination or misunderstandings. Improving the accuracy of information in the site reduces communication losses. Moreover, digitalization of as-built management shortens time spent on internal checks and document preparation before inspections. If data captured by smartphone surveying automatically generates as-built charts or organizes photo logs, the late-night paperwork at the office can be reduced. This contributes directly to correcting long working hours and improving the working style of site managers.

Improved safety is another benefit. Smartphone surveying can reduce personnel exposure to dangerous areas. For example, instead of having people approach and measure slope profiles in an excavation zone where heavy machinery operates, a point cloud scan from a safe distance can be used to check slope shapes. It may be possible to measure displacements of high structures from the ground without using an aerial work platform, depending on the method. Reducing surveying time outdoors also decreases exposure to heatstroke risk and time spent adjacent to traffic. From the perspective of “safety first,” adopting digital tools is important to protect lives and health.

Finally, mastering smartphone surveying contributes to self-improvement and career advancement for supervisors. As digital skills become increasingly sought after, having experience leading ICT-driven construction sites is a major asset. It enhances both internal and external evaluation and positions one as an instructor to teach younger staff the latest technologies. Personnel who can drive on-site DX are valuable, making active engagement with smartphone surveying worthwhile for career development.

Main Outcomes of Site DX (Improvements in Efficiency, Safety, and Quality)

What concrete outcomes can be expected from implementing on-site DX initiatives such as smartphone surveying? Below we summarize the main effects in terms of operational efficiency, safety, and quality control.

• Dramatic improvement in work efficiency: Introducing digital technologies significantly reduces time spent on surveying and construction planning. For instance, with 3D surveys by drones or smartphones, site assessment is accelerated and earthwork quantity calculations that used to take a week can often be completed in a single day. Tasks that previously required multiple people for as-built measurements can now be done by one person, freeing up manpower. As a result, shortened construction periods and cost reductions are expected, which in turn can lead to early openings and handovers and quicker social benefits.

• Improved safety: DX can reduce situations where people are exposed to danger. The spread of remote sensing (remote surveying) and automated construction reduces manual work at high places, confined spaces, and around heavy equipment, lowering the risk of occupational accidents. Also, working from data rather than relying on the intuition of experienced workers ensures psychological safety (the confidence that anyone can perform tasks correctly). Managing work records and checklists via smartphones prevents human errors and improves the quality of safety management. Sites where workers can work safely and for a long time contribute to the industry’s sustainability.

• Rationalization of quality control and inspection: Quality inspection based on digital data is fair and precise. Because DX ensures detailed construction records, ambiguous pass/fail judgments are reduced and quality can be guaranteed by objective standards. For example, if as-built data are submitted, the client can perform evidence-based inspections, reducing unnecessary comments and rework. Digital unification of documentation reduces the burden of inspection preparation, benefiting both supervisors and inspectors. Looking ahead, partial remote or unmanned inspections may be possible, moving toward a more efficient and reliable quality management system.

• Work-style reform and talent retention: Increased productivity through DX reduces unnecessary overtime and idle time, positively affecting the working styles of site technicians. Time saved through efficiency can be used for skill development or rest, improving the work environment and aiding retention. Furthermore, “smart sites” that use the latest technologies are attractive to younger generations and career changers from other industries. Making it easier for tech-savvy people to enter the construction industry helps alleviate chronic labor shortages. The “attractive construction site” i-Construction seeks is not only efficient but also a workplace where workers can feel pride and fulfillment, and DX supports that realization.

Conclusion: Start Construction Site DX with Smartphone Surveying

In the i-Construction era, smartphone surveying stands at the forefront of construction site DX. The idea of advanced ICT may sound grand, but leveraging a familiar tool like a smartphone makes it surprisingly easy to take the first step in DX. Today, devices and apps that turn smartphones into high-precision GNSS receivers have emerged, changing on-site surveying styles dramatically.

For example, LRTK, developed by Refixia, a startup from Tokyo Institute of Technology, is a pocket-sized RTK-GNSS receiver that attaches to smartphones and tablets. It operates in combination with a dedicated app to deliver centimeter-level real-time positioning. With such solutions, surveying work that used to be left to specialized equipment and skilled personnel can be performed by anyone with a smartphone. Smartphone surveying tools like LRTK integrate many necessary on-site functions—including high-precision positioning, point cloud scanning using smartphone cameras or LiDAR, layout marking by comparing with design data, photo records, and AR simulation—and acquired data can be shared to the cloud immediately, linking site and office with minimal time lag. Moreover, their price ranges make them much more accessible than traditional surveying instruments, bringing an era where site staff can have “one device per person” within sight.

DX in the construction industry cannot be achieved overnight. However, starting on-site surveying with smartphones is a tangible step that opens the door to DX. It may be a small step, but its effects will be felt immediately by those working on site. Change the way you “measure” and the way you “build” will change too. Efficiency improvements, enhanced safety, and higher-quality management—benefits brought by smartphone surveying will surely brighten the future of construction sites. Please consider introducing the innovation of smartphone surveying to your own sites and responsibilities. It is a major step toward realizing the productivity revolution advocated by i-Construction at the site level and creating construction sites that are easier and more attractive to work at. To avoid falling behind the wave of site DX, why not step into the future of surveying today with a smartphone in hand?