Streamlining Surveying with Network RTK: Complete Two-Person Tasks Solo

Amid labor shortages and calls for greater efficiency at survey sites, the recently introduced Network RTK technology is overturning conventional practices. What used to be standard "two-person" surveying workflows can now be completed by a single person using the latest GNSS positioning technologies. This article reviews the challenges of traditional two-person surveying, explains how Network RTK works and how it differs from single-point positioning, and details concrete procedures and key points for one-person surveying. It also discusses precautions to maintain high accuracy and safety, and how digitization improves recording and sharing. Finally, it introduces the latest trends in smartphone-based RTK surveying (LRTK) and considers prospects for further labor reduction in the future.

Traditional Two-Person Surveying and Its Challenges

On civil engineering sites, surveying has long been performed by teams of two. Typical tasks include the following:

• Boundary surveying: One person operates the survey instrument (such as a total station) while the other holds a prism or leveling staff at a distant point to measure boundary markers. Because two people must align positions and equipment, this process requires communication and time, reducing operational efficiency.

• As-built measurement: For verifying as-built conditions (the post-construction shape and dimensions), traditionally an assistant would hold a staff at each survey point while the survey technician operated the instrument to read elevations and coordinates. Coordination between two people was necessary, creating staffing burdens and increasing the risk of human error.

• Staking/layout (stakeout): When installing piles or markers according to design drawings, the work is usually performed by two people: the surveyor indicates the location with an instrument, and the assistant installs the stake at the instructed spot. This method can cause positioning errors from miscommunication and time losses from moving across large sites.

From measuring boundary points to checking as-built conditions and staking out positions, surveying has traditionally required team work. Securing personnel has been a heavy burden on understaffed sites, making it inefficient in terms of labor costs and scheduling. In hazardous environments, two-person operations themselves can also present safety management risks. So why has surveying that once required two people become feasible for one person today?

What Is Network RTK? How It Differs from Standalone Positioning

The key enabling one-person surveying is a GNSS surveying technology called Network RTK. RTK (Real Time Kinematic) is a GNSS positioning method that enhances position accuracy in real time by performing relative positioning between a base station and a rover. With traditional standalone GNSS positioning (single-point GPS), position errors of several meters are common due to satellite signal errors and atmospheric effects. In contrast, RTK operates a reference/base station with known coordinates alongside the moving rover; by correcting errors based on the difference in observations between the two, centimeter-level accuracy is achieved.

Network RTK is an advanced form of RTK. As the name implies, it uses a network of multiple reference stations so the user only needs to bring a rover to the site. By using data from national continuously-operating reference stations (e.g., those maintained by the Geospatial Information Authority) or commercial reference networks delivered over the Internet, there is no need to set up your own base station at the site. The rover's GNSS receiver transmits positioning data via mobile communication to a server, which cross-references and corrects the observations using nearby reference station data, delivering high-accuracy coordinates in real time.

The major difference from standalone positioning is positional accuracy and stability. Standalone positioning typically yields instantaneous positions with errors on the order of meters, making it unsuitable for precision tasks like boundary surveys or as-built control. Network RTK, benefiting from a nationwide network of reference stations, can provide centimeter-class accuracy almost uniformly across Japan. Even if the nearest reference station is far from the site, Network RTK prevents accuracy degradation by creating a virtual reference station (VRS) near the survey point. As a result, position accuracy remains stable even during wide-area mobile surveys, allowing work without worrying about distance to a base station.

Using Network RTK also simplifies equipment. Traditionally, RTK required installing your own base GNSS receiver, but with correction data delivered over a network you only need the rover at the site. This directly shortens setup and teardown times and lets you start surveying soon after arriving. In short, Network RTK is a next-generation surveying foundation that enables high-precision positioning with fewer devices and personnel.

Workflow for One-Person Surveying with Network RTK

With Network RTK, tasks once split between two people can be completed by a single operator because the operator can both position and verify points by themselves. Previously one person handled the instrument while the other positioned the target, but with Network RTK the operator carrying the rover can instantly know their own position with high accuracy. In other words, simply positioning yourself at the point to be measured makes that location the survey point. A typical one-person procedure is as follows.

• Equipment setup and connection: Upon arrival at the site, prepare a Network RTK-capable GNSS receiver (rover). Mount the receiver on a survey pole or monopod and power it on. Use a dedicated controller (survey terminal, tablet, or smartphone) to confirm communication with the rover. Connect the controller to the Internet and log in to the correction data service you subscribe to (such as via Ntrip) to begin receiving correction data.

• Initialization (establishing FIX): Once the receiver begins receiving satellite signals, perform the initialization necessary for high-precision positioning. This involves waiting until the solution changes from a float solution to a fixed solution (FIX). In clear-sky conditions this typically takes from several tens of seconds to a few minutes as satellite observations and correction data stabilize. Confirm on the controller that FIX is established and verify that positional accuracy has reached the centimeter level.

• Measuring points: When ready, move to the point to be measured carrying the pole. For boundary markers, place the pole tip vertically on the marker and take the point measurement. Press a button on the controller to record the current coordinates. For as-built measurement, move to each design-specified point and observe in sequence. For staking/layout (stakeout), compare the predetermined design coordinates with the current position on the controller and follow the on-screen guidance to move the pole to the required location; when the correct position is reached, install the stake or marking pin. In this way a single operator can carry the pole, move between points, take measurements, and complete staking operations alone.

• Data saving and verification: After measuring all required points, save the collected data on the controller. You can tag measured coordinates with date/time and point names, storing them as digital survey deliverables on the device or in the cloud. Review the day's results on site to check for omissions, and perform additional checks if necessary. This completes the surveying sequence. Since these operations can all be done by one person, with thoughtful movement and measurement planning a single operator can efficiently perform the workload of two people.

This Network RTK one-person workflow delivers many on-site benefits. Boundary and as-built measurements proceed without the stress of coordinating with another person. In staking tasks, immediate position verification and stake installation from the operator’s own actions removes wait times and miscommunication. Overall, enabling one-person surveying not only helps address labor shortages but also improves responsiveness on site.

Balancing Accuracy Control and Work Safety

Even when surveying alone, ensuring measurement accuracy and maintaining safety are more important than ever. For accuracy control, trust Network RTK’s high precision but do not skip on-site verification. For example, measure known control points or existing boundary markers before or during work to validate the instrument’s performance. Always monitor on the controller whether the RTK receiver maintains a FIX; if satellite reception deteriorates and accuracy becomes unstable, stop work rather than force continuation. Also maintain basic accuracy practices tailored to solo work: verify pole verticality with the bubble level, take multiple observations at each point and average them, etc. Because Network RTK correction data depend on communications, check mobile coverage in advance for mountainous or remote sites and consider alternatives—such as using a rover with radio communications or leveraging the Quasi-Zenith Satellite System Michibiki’s augmentation signal (CLAS)—to ensure reliability.

For safety, working alone requires cautious, safety-first behavior because there may be no one nearby to share situational awareness. Before starting, identify hazards and define work boundaries, notifying stakeholders of the work area as needed. During operations, continuously watch the surroundings; when heavy machinery or vehicles are nearby, make your presence known since a partner would otherwise provide that additional vigilance. For measurements on unstable terrain such as fallen trees, cliffs, high places, or on-road locations, do not attempt solo work if it is unsafe—call for assistance. Even with advanced Network RTK equipment, the fundamentals of surveying and safety awareness remain unchanged and must be upheld.

Streamlining Recording, Sharing, and Report Output through Digitization

One-person surveying with Network RTK has also transformed how survey data are recorded and used. In the past, data were recorded by hand in a field notebook and later transcribed to drawings or spreadsheets back at the office. Today’s digital surveying lets you save coordinate data electronically on site and share it immediately, enabling seamless report generation. Key efficiency improvements include:

• Automatic electronic recording: Data observed by the GNSS receiver and controller are saved as electronic files in real time. While surveying alone, if you enter point names and attributes on site you avoid deciphering handwritten notes later. This prevents transcription and handwriting errors and supports better data quality management.

• Cloud or intranet sharing: Uploading field data to the cloud or a shared server via mobile communication lets colleagues or clients remotely access information instantly. For example, boundary survey coordinates can be sent immediately to design staff for confirmation, allowing on-site adjustments based on their instructions. Centralized data management smooths coordination between field and office and improves overall workflow efficiency.

• Faster report and form generation: Digital data can be quickly converted into drawings and forms using dedicated software or apps. Reflecting survey results in CAD drawings or 3D models finishes faster with tools that automate coordinate system conversions. Photo logs and survey reports for as-built management can also be auto-generated by linking measurement data with photos and comments. This greatly reduces reporting time and frees personnel to focus on higher-value tasks.

With Network RTK at the core, surveying digitization connects measurements in the field to office deliverables in a continuous data flow. Coupled with the ability to complete surveys solo, the total process—from field measurement to reporting—becomes dramatically more efficient.

The Rise of Smartphone RTK Surveying and Future Prospects for Further Labor Reduction

Thanks to advances in Network RTK, we are entering an era where smartphones can serve as surveying instruments. A notable example is a solution called LRTK. LRTK consists of a compact RTK-GNSS receiver device that attaches to a smartphone or tablet and a dedicated app, enabling centimeter-class positioning comparable to expensive traditional survey instruments when the pocket-sized device is mounted on a phone. This makes it feasible for site supervisors and construction managers to perform surveying and layout tasks easily using one smartphone per person.

The strength of smartphone RTK lies in its portability and versatility. For example, if a site supervisor needs to check a small dimension in the field, instead of dispatching a survey crew to re-measure with a total station, they can attach an RTK device to their phone and obtain results immediately. Systems like LRTK also allow high-precision positions to be combined with photos and notes and saved to the cloud on the spot. For instance, when inspecting cracks in a structure, taking a photo with a smartphone can automatically record the position and orientation, removing the divide between surveying and documentation. If such "anyone, anywhere can measure" capabilities become common, non-specialists on site will be able to perform necessary measurements without relying on dedicated survey technicians, enabling further labor reductions and faster workflows.

As smartphone RTK spreads, surveying will become increasingly democratized. When high-precision positioning is no longer limited to specialists but available to various on-site roles, overall productivity on construction sites will improve. Combined with automated surveying by drones and integration with machine guidance for construction equipment, more work could be done without human presence, expanding the scope of unmanned construction. Network RTK is the foundational technology supporting these next-generation construction DX initiatives, and the emergence of smartphone RTK (LRTK) is a decisive tool for labor and effort reduction. By equipping each technician with up-to-date surveying skills and tools, we can update the long-standing "two-person" surveying norm and establish efficient, safe surveying practices suited to the needs of the future.