Table of Contents

• What is Network RTK? Its Mechanism and Accuracy

• Network RTK Achieved with a Smartphone and GNSS Device

• Point Cloud Scanning × Network RTK: Benefits of the Combination

• Features of the LRTK System (Smartphone-Integrated, Centimeter-Level Positioning, Photo Positioning, AR Guidance, Point Cloud Scanning)

• Applications to Cloud Sharing, Design Data Integration, and As-Built Management

• Field Deployment Cases and Effects (Labor Savings, Time Reduction, Safety Improvements)

• Advice for Sites Introducing It for the First Time

• An Invitation to Simple Surveying with LRTK

• FAQ (Frequently Asked Questions)

What is Network RTK? Its Mechanism and Accuracy

In surveying and construction sites, even errors of a few centimeters can greatly affect quality and safety. Accurate positional information is indispensable for infrastructure works such as highways and railways, pile driving, and as-built management. For this reason, RTK positioning (Real Time Kinematic), which corrects satellite positioning (GNSS/GPS) errors in real time to achieve centimeter-level accuracy, is widely used. Ordinary GNSS positioning has errors on the order of meters, but RTK reduces errors to a few centimeters through real-time corrections, enabling immediate acquisition of highly accurate coordinates.

The basic principle of RTK is relative positioning. Two GNSS receivers—a base station installed at known coordinates and a rover that moves while measuring—simultaneously receive satellite signals. The error information computed at the base station is sent to the rover. The rover applies that correction data to its own positioning results and calculates a position with centimeter-level accuracy. This method cancels out factors that single-receiver positioning cannot remove, such as satellite orbit errors and atmospheric effects, dramatically improving positioning accuracy. Under proper operation, RTK typically achieves about 1–2 cm accuracy horizontally, delivering high precision that sets it apart from conventional meter-level GPS positioning.

However, conventional RTK required users to set up their own base station near the site. Because accuracy degrades as the distance (baseline length) between the base and rover increases, in wide work areas the base station had to be moved repeatedly closer to the working area, which added time and cost. Network RTK solves these constraints. Network RTK uses a network of multiple reference stations maintained nationwide by governmental or private entities to generate correction data as if a virtual base station exists near the user. The user (rover) does not need to prepare a base station and can perform RTK positioning simply by connecting to a correction information service delivered over the Internet. In the representative VRS (Virtual Reference Station) method, the server analyzes data from several nearby reference stations based on the user’s approximate position and generates corrections assuming a virtual reference point near the user. By receiving this correction information, the rover can achieve the same accuracy as if a base station were right next to it.

Benefits of Network RTK:

• No need to set up a base station: The virtual reference station method eliminates the need to bring your own base station. Surveying can be performed with just one rover receiver, significantly reducing on-site setup time.

• Uniform accuracy over wide areas: Because a virtual reference point is always set near the measurement location, accuracy degradation due to distance from a reference station is minimal, allowing stable centimeter-level accuracy even for long-distance measurements. This enables consistent high-precision positioning on large earthworks sites and long road or bridge projects.

• Immediate positioning and real-time sharing: Since correction information is received over the network, turning on the device and connecting starts high-precision positioning immediately. This makes it easy to share obtained coordinates on-site and use them in subsequent workflows.

In Japan, the main ways to obtain network RTK correction information are:

• GEONET (electronic reference stations): A GNSS reference station network of about 1,300 sites nationwide operated by the Geospatial Information Authority of Japan, providing correction information used in public surveying and offering real-time high-precision coordinates in the World Geodetic System (JGD2011) via VRS and other methods.

• Commercial correction services using the Ntrip method: Paid services that distribute RTK correction information via mobile communication networks; with a subscription they can be used anywhere in Japan. Examples include carrier services (such as SoftBank’s “ichimill”) and services from surveying equipment manufacturers. Their ease of use without a personal base station has promoted widespread adoption.

• CLAS (Centimeter-Level Augmentation Service): Correction information broadcast via the L6 signal from Japan’s QZSS “Michibiki.” Compatible GNSS receivers can directly receive corrections from the satellite even outside mobile network coverage, providing centimeter-level accuracy without additional cost. This is notable for use in mountainous areas or during disasters when communications may be disrupted.

With the advent of network RTK, stable centimeter-level positioning has become easily achievable regardless of location. In construction, driven by ICT construction and i-Construction initiatives, environments are emerging where precise surveying—previously requiring specialist surveyors and expensive equipment—can be performed more conveniently by on-site workers themselves.

Network RTK Achieved with a Smartphone and GNSS Device

To fully leverage network RTK’s advantages, you need a high-precision GNSS receiver and a way to connect to correction information. Traditionally, this combination was operated with dedicated controllers like total station controllers or laptops. Recently, however, combining a smartphone with a compact GNSS receiver has made network RTK positioning accessible to anyone.

The mechanism for high-precision positioning using a smartphone and GNSS device is simple. First, install a dedicated surveying app on the smartphone and connect it to an external GNSS receiver via Bluetooth or cable. This receiver contains an RTK-capable high-performance antenna and chip and acquires multi-frequency satellite signals such as GPS and GLONASS. The smartphone app accesses network RTK correction services (such as Ntrip distribution services) over the Internet and receives correction data corresponding to the current location in real time. The corrections are then applied to the raw positioning data from the GNSS receiver to calculate coordinates with centimeter-level accuracy.

All of these processes are performed automatically by the smartphone app, so users obtain high-precision positioning results without special awareness. Measured coordinates are displayed on the smartphone screen as maps or numeric values and can be recorded and shared. In short, the smartphone serves as the “brain” and display of a high-precision positioning system, while the GNSS device acts as the high-performance “positioning sensor.”

There are many advantages to the smartphone + GNSS combination. First, using an existing smartphone reduces costs compared with acquiring dedicated equipment. The smartphone’s touch interface and familiar UI allow intuitive positioning operations. RTK settings and connections that previously required specialist knowledge are simplified by app-guided steps to select correction service IDs and mount points. Because on-site workers are already comfortable with smartphones, non-technical staff can adopt the system with less resistance.

Additionally, as the smartphone itself is a communication terminal, connecting to external correction services is easy. If 4G/5G coverage is available, correction information can be obtained on site without a laptop or radio modem. This is particularly advantageous for mobile operations or crews with few personnel. Modern smartphones also have high-performance CPUs and sensors, enabling not only positioning but also integrated tasks—camera use, AR, and cloud integration—so that “measure + record + share” workflows can be completed on a single device.

A concrete example is the recently introduced smartphone-attached RTK receivers. For instance, the “LRTK Phone” is a pocket-sized device weighing about 125 g and slightly over 1 cm thick, designed to attach to an iPhone case. Even such ultra-compact GNSS units contain an antenna and battery and can achieve positioning accuracy around ±2 cm horizontally and ±4 cm vertically. By integrating with the smartphone, they are designed to be carried and used casually, enabling a new surveying style of “take it out and measure when needed.” Because the GNSS receiver connects via Bluetooth, cumbersome cable connections are unnecessary. All you need is a smartphone and a palm-sized receiver—precision positioning previously performed by stationary equipment can now be accomplished equivalently.

Network-outage operation is also addressed. For example, higher-end models of LRTK Phone can directly receive Michibiki’s CLAS signals, enabling high-precision positioning even in areas without mobile coverage, such as mountains or during disasters. There are documented cases where photogrammetry succeeded in disaster sites where mobile communications were blocked. Thus, the smartphone + GNSS device combination is increasingly valuable as a positioning method that does not rely entirely on communications infrastructure.

Point Cloud Scanning × Network RTK: Benefits of the Combination

High-precision positioning using a smartphone and network RTK is groundbreaking on its own, but the combination with point cloud scanning is especially noteworthy. Point cloud scanning refers to methods that measure objects or terrain in 3D as a collection of many points, obtaining dense 3D information via laser scanners or photogrammetry (SfM). Traditionally, attaching accurate geospatial coordinates to point cloud data required placing ground control targets or post-processing to align with control points. However, combining centimeter-level positioning from network RTK with point cloud acquisition makes it possible to perform scanning and positioning simultaneously and directly assign high-precision coordinates to the acquired point cloud.

For example, if a LiDAR-equipped smartphone scans surrounding terrain while the phone’s position is tracked precisely by RTK, accurate latitude, longitude, and elevation can be assigned in real time to each point in the point cloud. This suppresses common issues in smartphone walking scans such as distortion or scale drift through GNSS-based position correction. In other words, point clouds obtained with a smartphone can immediately serve as survey data “with global coordinates.”

The benefits are immense. Standard smartphone-only point cloud scans (for example, AR scans on iPhone) produce 3D data in an arbitrary local coordinate system, requiring alignment work to overlay with maps or design data. Long walking scans can accumulate small errors that curve the terrain. Combining with network RTK addresses these problems at once. Point clouds obtained on-site match GIS or CAD coordinate systems and become survey deliverables with guaranteed accuracy, greatly reducing post-processing workload.

Moreover, various measurements using point clouds can be performed on site immediately after acquisition. For example, an app can measure distances between arbitrary points, or calculate areas and volumes of enclosed regions. On earthworks sites, you can scan stockpiles or excavations and calculate volumes right away for daily progress management. For complex structures, dimensions and displacements can be checked on the point cloud to quickly recognize deviations from design drawings.

Photogrammetry pairs very well with this approach. If multiple photos taken with a high-performance smartphone camera are tagged with high-precision RTK-based shooting coordinates, processing with dedicated software can easily generate a 3D model with absolute coordinates. Previously, photogrammetry models needed georeferencing afterwards using ground survey points, but if accurate latitude and longitude are recorded in the Exif data from the start, alignment can be automated and simplified.

In short, combining smartphone point cloud scanning with network RTK means “converting the on-site reality into high-precision 3D data” directly. Tasks that once required expensive 3D laser scanners or RTK drones can now be performed with a handheld smartphone and a small GNSS terminal. Non-surveyors such as construction managers and engineers can acquire detailed 3D on-site information and use it immediately, offering the potential to transform workflows significantly.

Features of the LRTK System (Smartphone-Integrated, Centimeter-Level Positioning, Photo Positioning, AR Guidance, Point Cloud Scanning)

What actualizes the smartphone + RTK + point cloud surveying experience described above is the “LRTK system.” LRTK is a next-generation surveying solution using smartphones, and its defining feature is that “the smartphone itself becomes a high-precision 3D surveying instrument.” Below are the main features of the LRTK system with explanations.

• Smartphone-integrated: LRTK is designed to be used integrated with a smartphone. A dedicated slim GNSS receiver (LRTK Phone) attaches to the back of an iPhone, allowing the phone to be carried as a surveying device. Heavy tripods and mounted equipment are unnecessary; you can walk and survey while operating with one hand. The housing is as compact and lightweight as possible—pocketable—so it can be carried at all times and used whenever measurement is needed. This is a major advantage for responding instantly to “I just want to measure here” on site.

• Centimeter-level positioning: LRTK’s GNSS terminals are multi-band and achieve centimeter-level positioning using network RTK and Michibiki (CLAS). Horizontal positioning is typically within about ±2–3 cm, and elevation within a few centimeters, making it practical for ordinary civil engineering surveys and as-built confirmations. Positioning results are automatically converted and displayed on the smartphone app in Japan’s Plane Rectangular Coordinate System and geoid height. Coordinates in the World Geodetic System (JGD2011) are obtained directly, facilitating alignment with design drawings and other survey data. The RTK GNSS status (Fix/Float) is also shown on screen for easy quality management.

• Photo positioning: LRTK includes unique functions that leverage the smartphone camera. The LRTK app’s “positioned photo” feature automatically attaches high-precision coordinates and orientation information to photos when taken. Photo data are plotted on a cloud map so you can instantly see where and in which direction a photo was shot. This allows, for example, crack photos taken during infrastructure inspections to be stored with location information, making it easy to find the same spot later. Moreover, on LiDAR-equipped iPhones, a “target positioning” feature lets you tap a point in a photo of a somewhat distant object to measure that point’s coordinates. This innovative capability allows pinpoint positioning of places that are dangerous or at height, without physically entering them.

• AR guidance: AR-based surveying support is another major LRTK feature. While displaying real-time camera footage on the smartphone screen, virtual markers and guidance can be overlaid. For example, when pointing the smartphone toward a pre-set target point, arrows or target markers appear on the screen to guide you in that direction. This enables even inexperienced workers to intuitively perform stakeout or point layout based on numeric coordinates. You can also place virtual stakes (AR stakes) at measured coordinates in the field. In places where physical stakes can’t be installed (cliff faces, concrete floors, etc.), virtual markers in AR allow accurate positioning. LRTK also supports overlaying BIM/CIM 3D design data on-site in AR, letting stakeholders share completion visuals or verify whether construction will fit the actual terrain. Because LRTK continuously maintains high-precision positioning, AR models remain stable and do not drift, which is highly valued.

• Point cloud scanning: LRTK includes 3D point cloud scanning using the smartphone’s LiDAR scanner. As mentioned earlier, the combination of smartphone and RTK makes point cloud measurements with global coordinates possible. Starting a scan in the LRTK app lets you walk around and convert surrounding terrain and structures into point cloud data. Because the smartphone’s position is tracked with centimeter accuracy during scanning, distortion is less likely and anyone can obtain stable results. Acquired point clouds can be immediately reviewed on the device, and measurements such as distance or elevation difference between any two points can be taken on the spot. Of course, finished point cloud data can be uploaded to the cloud for storage and sharing or downloaded for use in CAD software as needed.

As described, the LRTK system places the familiar smartphone at its core and fuses GNSS, AR, LiDAR, and photogrammetry into an all-in-one surveying platform that handles positioning, recording, analysis, and visualization. Because centimeter-accurate location information and on-site situation awareness are completed in a single system, conventional surveying workflows can be greatly streamlined and the system strongly supports on-site DX (digital transformation).

Applications to Cloud Sharing, Design Data Integration, and As-Built Management

Integration with cloud services is a key element of smartphone RTK solutions including the LRTK system. Aggregating and sharing survey data in the cloud eliminates information gaps between the field and the office and enables real-time collaborative work. For example, coordinates, photos, and point cloud data acquired with the LRTK app can be uploaded to the LRTK Cloud with one tap. engineers and designers in the office can access the cloud via a web browser to immediately view and download the latest field data. Compared to bringing site-recorded numbers and drawings back to the office before sharing, information transmission speed is dramatically improved.

On the cloud, measured points displayed on a map and uploaded point clouds and photos can be shared within the team. Because all stakeholders can check the same platform, misunderstandings and communication errors are reduced. Some services also provide functions to generate daily reports and forms from the acquired data, enabling automation of reporting and further efficiency.

A notable capability is integration with design data in the cloud. LRTK Cloud allows overlaying point cloud data acquired on-site with design-stage 3D models and alignment lines. For example, uploading the current terrain point cloud and importing the planned BIM/CIM model results in automatic spatial alignment for browser-based comparison. Because the design model is placed in the actual coordinate system, differences from current conditions can be intuitively recognized, and model position adjustments can be performed in the cloud if needed. This makes it easy for designers to verify before construction whether “the design will fit on site,” or conversely, to verify after construction whether the as-built matches the design.

As-built management is also powerful. The cloud can perform point cloud differencing. Comparing scanned terrain point clouds with the design model lets you instantly calculate required earthwork volumes and progress. Repeated weekly or monthly scans allow quantitative tracking of construction progress and help in earthwork quantity control and as-built verification. Positioned photos are automatically linked to the point cloud, so you can, for instance, attach close-up photos of deteriorated areas to bridge point cloud models for advanced maintenance databases.

By adopting smartphone RTK + cloud workflows, you enable a data lifecycle that looks beyond “measure and finish” to “utilize after measurement.” On-site information is immediately shared internally and with clients and fed back into design and construction cycles, preventing rework and improving quality. Unlike the days of paper field notebooks, digital data becomes an organizational asset that can be leveraged for future planning and inspections.

Field Deployment Cases and Effects (Labor Savings, Time Reduction, Safety Improvements)

What effects can be expected when applying smartphone × network RTK technology on site? Below are typical benefits—labor savings, time reduction, and safety improvements—along with illustrative cases.

• Labor savings: Traditionally, surveying and setting out often required teams of two or more: one holding a prism, another operating a total station. With smartphone + RTK, a single person can carry a receiver, record points, or mark points following AR guidance. Solo operation becomes possible without assistants, making it efficient in sites with staff shortages. Some major contractors have started issuing smartphone surveying devices to field workers so they can perform routine surveys and as-built checks themselves. If tasks previously outsourced to specialist survey teams can be completed “one person, one device,” significant labor savings follow.

• Time reduction (efficiency): Time savings are notable. For example, at one earthworks site, a terrain survey that used to take a full day was completed in about 30 minutes using smartphone RTK point cloud scanning. Tasks that required setting multiple measurement lines previously are now done by walking and scanning surfaces, and required values (like earthwork volumes) are automatically obtained. For stakeout, where positions were previously set using drawings, tape measures, and survey instruments, following instructions on the smartphone screen is often sufficient. Because even inexperienced workers can perform layout without rework, reductions in redo work and communication loss contribute to overall schedule shortening. Real-time cloud reporting also speeds decision-making for subsequent processes.

• Safety improvements: Safety in surveying and measurement work also improves. Remote measurement of hazardous areas is a major advantage. For example, points on a slope at risk of collapse can be measured from a safe distance using the object positioning feature without entering the dangerous area. Roadside surveys with high traffic exposure can be completed quickly, reducing worker exposure time. AR stakes can be used to visualize underground utilities before excavation, helping to prevent accidental damage to pipes. In disaster response, smartphone RTK photo records enable rapid sharing of damage status (CLAS-capable devices could position without mobile coverage). In these ways, smartphone RTK contributes to safety management by reducing dangerous exposures while enabling rapid, accurate data collection.

These effects are examples, but feedback from sites includes comments such as “it was easier than imagined,” “we don’t need to take out the total station as often now,” and “even newcomers could use it quickly.” Systems like LRTK that consolidate multiple functions in one device allow photo recording and as-built checks to be done in parallel with surveying, enabling effective use of downtime and reducing task re-sequencing. The cumulative effect is improved productivity and quality while achieving labor savings.

Advice for Sites Introducing It for the First Time

When introducing smartphone-based network RTK surveying to a site for the first time, there are several key points to keep in mind. To launch the new technology smoothly and maximize benefits, consider the following advice.

• Preparation and testing: Before introduction, verify the supported smartphone models and GNSS device operating environment. LRTK requires an iPhone, and LiDAR-equipped Pro models are recommended to fully utilize point cloud scanning and object positioning. Before bringing devices to the site, install the app and configure connections to correction services (Ntrip IDs, mount points, passwords, etc.), and perform test measurements outdoors to ensure you can obtain a Fix solution (centimeter-level positioning). Practicing simple measurements at known points to become familiar with operations is also advisable.

• Understand environmental conditions: GNSS positioning is affected by the surrounding environment. For first-time sites, assess sky visibility and network conditions. Structures or trees that largely block the sky reduce the number of satellites and may destabilize accuracy. In such cases, prioritize observations in open areas or shift measurement times to favorable satellite geometry. Urban canyons are prone to multipath errors, so use filtering options in the app if available. Also, ensure sufficient battery charge for both smartphone and receiver for extended use, and carry spare power as needed.

• Gradual adoption: Rather than replacing all tasks with smartphone RTK immediately, introduce it gradually starting with tasks well suited to the method. For example, initially try point cloud scanning for part of as-built measurement or use AR stakes for machine setup reference points. As staff gain familiarity with accuracy and procedures, expand usage. In the early stages, cross-check important control points with conventional equipment to validate results. This builds trust and allows safe expansion of use.

• Internal training and information sharing: Training and communication to field staff are important when introducing new equipment. Even if operation is simple, explaining “where it can be used” and “what accuracy to expect” encourages active use. Use demos and site visits to let staff experience the system hands-on. After introduction, share acquired data through company cloud storage and reporting meetings to accumulate success stories and know-how for smooth horizontal rollout. Also, prepare vendor support contacts or user communities for troubleshooting.

• Rules and quality control: If smartphone RTK measurements will be treated as official survey deliverables, establish internal rules and quality management standards. For example, set standards for observation modes and averaging counts, define backup procedures when accuracy is insufficient (e.g., prepare a simple backup base station), and specify data storage formats and check procedures. Fortunately, systems like LRTK automatically record positioning quality, making per-point reliability checks easy. Define quality targets in advance and, if necessary, continue using conventional methods in parallel while transitioning gradually to avoid resistance on site.

With these points in mind, even first-time sites should be able to introduce smartphone-based high-precision surveying smoothly. The key is to understand the balance between ease of use and accuracy and to apply the new technology where it is most appropriate. Once the team experiences real benefits on site, they will likely propose further applications.

An Invitation to Simple Surveying with LRTK

We have introduced the new surveying experience brought by the fusion of network RTK and smartphones, from overview to applications. As the title “Point Cloud Scanning Made Easy with a Smartphone!” suggests, high-precision surveying and 3D measurement are no longer exclusive to specialists; they are becoming accessible to everyone. Systems like LRTK simplify formerly complicated surveying tasks and will accelerate on-site utilization of digital data in many scenes.

Those new to this may be skeptical—“Can a smartphone really do that?”—but sites that have introduced the technology report clear benefits such as labor savings, time reduction, and safety improvements. Above all, enabling precise positioning with an everyday tool like a smartphone fosters a change in mindset among workers and is an ideal first step in on-site DX.

If you feel “I want to try this at my site” after reading this article, try experiencing simple surveying with LRTK. No specialized equipment or complicated setup is required. Just attach a small receiver to your usual smartphone and you can start centimeter-level positioning and 3D scanning from tomorrow. This new surveying experience may well redefine conventions at your site.

Start by gathering information from the official website’s introduction pages or request materials. Use them to explore application examples and implementation plans tailored to your site’s challenges. Step ahead into the future of surveying—running around sites with a smartphone in hand, efficient and smart.

FAQ (Frequently Asked Questions)

Q. What do I need to use network RTK positioning with only a smartphone? A. Basically, you need an RTK-capable GNSS receiver and an environment to receive correction information via the Internet. Specifically, prepare a high-precision GNSS antenna that can connect to your smartphone (for example, a device like the LRTK Phone) and subscribe to an RTK correction data distribution service (such as the Geospatial Information Authority’s electronic reference stations or commercial Ntrip services). Install the dedicated app on your smartphone, pair the receiver via Bluetooth, and log in to the correction service—then you’re ready. Once you start positioning, centimeter-level coordinates appear on the smartphone. In Japan, in addition to paid correction services, QZSS’s CLAS is also available as correction information; with a compatible receiver, high-precision positioning is possible without a mobile subscription.

Q. Can I use it with my current smartphone? (Supported devices and models) A. Currently, iOS (iPhone/iPad) solutions are mainstream. LRTK is designed for iPhone; basic functions work on most iPhones, but LiDAR-equipped Pro series models are required for certain features. For example, 3D point cloud scanning and object positioning (measuring points at a distance via the camera) are possible only on LiDAR models. Single-point positioning, coordinate recording, and photo geotagging work on non-Pro iPhones and iPads. Positioning accuracy is provided by the GNSS receiver, but newer devices generally perform better in processing speed and AR stability. Android support is not generally available at this time, so iPhone users can adopt more smoothly.

Q. Is positioning accuracy really at the centimeter level? A. Yes—under appropriate conditions, horizontal accuracy is around 1–2 cm and elevation around 3–4 cm. There are cases where, with the receiver stationary and averaging over time, stability to the millimeter level has been reported. However, this depends on satellite reception conditions and correction data quality. In open-sky environments with an RTK Fix solution (integer solution), high accuracy can be expected. In locations surrounded by tall buildings or under trees, you may temporarily get a Float solution with errors of tens of centimeters, so consider averaging or timing measurements as needed. Coordinates are output in Japan’s geodetic datum (World Geodetic System JGD2011), enabling compliance with public surveying accuracy requirements. Except for surveys requiring strict baseline control or formal verification (e.g., network class surveys), smartphone RTK provides sufficient accuracy for field construction and management tasks.

Q. Can it be used where mobile reception is unavailable? A. There are several options for use in communication blackouts. First, devices that directly receive Michibiki’s CLAS signals—such as CLAS-enabled LRTK Phone 4C models—can achieve centimeter-level positioning from satellite corrections without mobile networks. This has proven effective for mountain surveys and disaster-site investigations. Alternatively, in areas without communications, you can operate a local RTK setup by deploying your own RTK base station on site (some higher-end LRTK series devices support base station mode). This approach may require radio license procedures in some cases, but it is an effective means of achieving high-precision positioning in remote areas. Overall, even without mobile infrastructure, CLAS satellite augmentation or standalone reference stations can realize RTK positioning.

Q. Can smartphone RTK replace all surveying equipment? A. Smartphone RTK covers a wide range of applications but does not immediately render all existing surveying instruments obsolete. For tasks requiring millimeter-level accuracy for structural positioning, or in GNSS-denied environments such as building interiors or underground, total stations and laser levels will still be necessary. However, for many tasks where centimeter accuracy is sufficient, smartphone RTK can substitute. Field terrain surveys, as-built checks, simple stakeout, and wide-area point measurements can be done quickly by one person, so combining smartphone RTK with conventional instruments allows efficient allocation of work. The key is to use the right tool for the right job: handle about 80% of routine tasks with smartphone RTK and use conventional equipment for final verification or specialized surveys. You can also use smartphone RTK data as a basis and perform additional targeted measurements with conventional instruments where needed.

Q. Are surveyor qualifications or special skills required? A. Operating the smartphone RTK system itself does not require official qualifications, and basic usage is intuitive. Using network RTK or Michibiki CLAS does not require radio station licensing (radio law licensing is involved only for local RTK operations using dedicated wireless links). For internal construction management or as-built surveys, non-licensed personnel can use the system without issue. However, if deliverables are to be submitted as public survey results, survey companies or licensed surveyors still need to be involved as before. While the devices simplify operation, understanding surveying basics—such as geodetic datums and accuracy management—helps in proper use. When first deploying on site, it is reassuring to have an experienced surveyor supervise until staff are accustomed. Also, because cloud integration and AR introduce new elements, involving younger or IT-savvy staff to lead deployment can be effective. In any case, operation is not difficult, so interested parties are encouraged to try it hands-on.