Five Key Points: Streamlining the Creation of Architectural and Civil Engineering Plan Views with Smartphone Surveying

In architectural and civil engineering sites, accurate plan views and as-built drawings are required for a variety of tasks such as pre-construction surveys and boundary confirmations, post-construction as-built management, submission of inspection documents, and recording damage after disasters. Conventionally, creating these drawings required specialized surveying work and time-consuming drafting. However in recent years a new surveying method using smartphones—often called smartphone surveying—has emerged, promising to improve drawing creation efficiency. As the industry-wide push for ICT and DX in construction led by initiatives like the Ministry of Land, Infrastructure, Transport and Tourism’s i-Construction advances, smartphone surveying is attracting attention as a technology that concretely realizes that trend. By using familiar smartphones and dedicated apps, anyone can easily acquire coordinate data on site and directly convert and share those data as drawings.

For example, imagine a municipal staff member who must urgently produce an as-built map of a site damaged by heavy rain. Traditionally they might have had to contract a specialized surveying company and wait several days, but with smartphone surveying the staff member could personally acquire on-site coordinate data in half a day and compile the drawing the same day. In situations that demand rapid on-site responsiveness, smartphone surveying can be a powerful asset. If an as-built map can be created in a short time, subsequent recovery planning and information sharing with stakeholders can also proceed quickly.

This article explains, focusing on five key points, how smartphone surveying can streamline the creation of plan views in the architectural and civil engineering fields. We will review the differences from traditional methods and the benefits of adoption in order.

Point 1: Greatly Reduced Adoption Barrier Thanks to Ease of Use for Anyone

One of the biggest benefits of smartphone surveying is its low barrier to adoption. Traditionally, surveying for plan creation required expensive equipment such as total stations and GPS surveying instruments and specialized knowledge, making it necessary to rely on experienced personnel such as surveyors. On-site work was typically done in teams of two, incurring personnel and training costs. In contrast, surveying using a smartphone only requires on-site staff to operate an app on a device they are familiar with, so even beginners can start without resistance. Intuitive operations like tapping the screen enable measurements without long training times for equipment handling. Heavy tripods and complex equipment setups are unnecessary—measurements can be taken simply by walking around with the device in hand. Because special qualifications or advanced skills are not required, tasks that were previously outsourced can be brought in-house more easily. This also helps address the serious shortage of surveying personnel and the aging of skilled technicians in the construction industry. With smartphone surveying, each on-site staff member can participate in surveying, allowing limited personnel to respond efficiently.

Another attractive point is the lower initial cost compared to equipping specialized instruments. By combining a smartphone and an app with small measurement devices as needed, surveying work that once required capital investments of several million yen can be started on a modest budget. This makes adoption easier for small and medium-sized construction firms and municipal sites that could not afford expensive equipment, and broad on-site utilization can be expected.

Point 2: Major Efficiency Gains and Speed-up of On-site Work

Smartphone surveying dramatically improves on-site work efficiency. Traditionally, instruments had to be set up for each control point and distance and elevation carefully measured and recorded point by point, but with a smartphone a single person can proceed to take measurements one after another. For example, on a dedicated app you can move to a desired point and simply tap the screen to instantly record latitude, longitude, and elevation coordinates. By walking around and continuously acquiring multiple points, you can gather data for an entire site in a short time. Furthermore, with LiDAR-equipped smartphones or photogrammetry functions, you can scan the surroundings just by walking around and acquire terrain and structures as point cloud data (3D data composed of many points) all at once. A single scan can record millions of measurement points, enabling comprehensive data capture even for complex terrain. It also becomes possible to measure distances, areas, and volumes directly on the acquired point cloud on site, reducing the need for quantity calculations back at the office. By acquiring data comprehensively in this way, measurements that previously relied on a limited set of representative points and caused rework can be performed from the start with fewer omissions.

The introduction of these methods has actually led to dramatically shorter surveying times in reported cases. Tasks that used to take two days for as-built measurement and drawing creation have in some cases been completed in roughly half a day with smartphone surveying, contributing to shorter construction schedules and reduced overtime. This reduces the burden on site supervisors who would otherwise be occupied with surveying and drawing tasks, allowing them to concentrate on core construction management duties. Also, because the data acquired on site are already digital, the office-side work of producing drawings from returned records is simplified. The need to handwrite notes in paper field books and later transcribe them disappears, making it possible to complete drawings and reports the same day. By using smartphone surveying, the entire process from on-site data collection to deliverable creation moves more swiftly. Quicker submission of surveying results gives downstream tasks and inspection scheduling greater leeway. For instance, it helps prevent situations where delays in preparing as-built inspection documents cause inspections to be postponed, positively impacting overall schedule management. Shortening the time required for surveying and drawing creation can thus improve productivity across the site. In addition, because tasks such as verifying boundary stakes or measuring elevations can yield numbers on the spot, attendance and inspection confirmation work proceeds smoothly.

Point 3: Ensuring Quality through Improved Accuracy and Reliability

You might wonder, “Is surveying with a smartphone really accurate?” It is true that the typical smartphone’s built-in GPS alone can sometimes produce errors of several meters (several ft). However, we live in an era where high-precision GNSS (satellite positioning) correction techniques (RTK) can be used with smartphones. By attaching a dedicated small antenna to a smartphone and receiving correction signals from satellites, positioning errors can be drastically reduced to the order of several centimeters (several in). In Japan, the Quasi-Zenith Satellite System “Michibiki” provides RTK correction signals (CLAS), and by simply connecting a dedicated receiver to a smartphone you can conveniently use these high-precision positioning services. For example, combining an RTK-capable antenna with your smartphone allows you to position yourself with 2-3 cm (0.8-1.2 in) accuracy, and the coordinates of points acquired in that state are guaranteed to be highly accurate. This makes it possible to collect data for plan views with accuracy that is practically sufficient even when using smartphone surveying.

Being a digital measurement method itself also contributes to improved reliability. In traditional methods where humans measure with tapes and then transcribe values, there was always the risk of human error such as copy mistakes or calculation errors. With smartphone surveying, measured values are automatically recorded electronically, reducing the likelihood of recording errors. Moreover, the ability to check acquired data on site helps improve quality. Using AR (augmented reality) functions, you can overlay the measured point cloud data of the actual site with the design model on site. You can even color-code discrepancies from the intended state right there, enabling immediate detection of issues that previously would only have been discovered back at the office—such as insufficient concrete thickness or incorrect slopes. Noticing an error immediately after construction allows remedial work before concrete sets, preventing later rework or overlooked quality defects. In one actual case, a site discovered areas of insufficient concrete thickness immediately after casting using an AR heatmap display and performed additional casting on the spot, avoiding later rework. In this way, the introduction of smartphone surveying improves both data accuracy and reliability, ensuring the quality of drawings and inspection reports. The ability to achieve quality assurance and work efficiency simultaneously is another major strength of smartphone surveying.

Point 4: Improved Safety and Data Acquisition Even in Difficult Locations

Smartphone surveying also contributes to improving on-site safety. In traditional surveying, measuring in hazardous or hard-to-access places—such as high slopes, under bridges, or inside narrow tunnels—was difficult. Attempting to measure these areas by force involves the risk of placing workers at heights or in confined spaces, so such areas were often left unmeasured when unavoidable. With smartphone-based methods, measuring these difficult areas becomes much easier. LiDAR or photogrammetric scanning enables safe remote recording of shapes, and creative approaches such as mounting a smartphone on a monopod to obtain coordinates of previously unreachable spots are possible. For example, by photographing a steep slope from above and converting it to a point cloud, you can acquire terrain data without workers having to descend the slope. Furthermore, in situations such as immediately after a disaster where deploying large-scale equipment is not feasible, being able to measure and record the situation with just a smartphone is a major advantage. Small devices can be brought into confined spaces, and shorter measurement times reduce traffic risks when surveying on roads.

Another advantage of smartphone surveying is that it makes it easier to comprehensively digitize the entire site. Because a single measurement can cover a wide area, you can record the current state including spots that were previously missed. The risk of later realizing “I forgot to measure that point” is reduced, and the number of return visits for re-measurement can be minimized. As a result, while maintaining safety as the top priority, you can acquire sufficient data and gather all the information needed to create plan views. By using smartphone surveying in this way, you can both reduce on-site risks and improve the accuracy of collected data.

Point 5: Real-time Data Sharing and Smooth Drawing Creation

The high shareability of data is another major advantage of smartphone surveying. Measurement data and captured photos can be synchronized to the cloud from the smartphone immediately. Even if there is no internet connection on site, data can be stored on the device and uploaded once a signal is available. Once data are in the cloud, the latest information can be viewed immediately from office PCs. Supervisors or clients located away from the site can understand progress in real time without visiting the site. For example, office personnel can immediately start creating plan views or calculating quantities from point cloud data acquired on site. The time lag between site and office is greatly reduced, and tasks based on surveying results can proceed quickly. In addition, photos taken with the smartphone are automatically geotagged, making it easy later to link photos to drawings.

Sharing data via the cloud also smooths reporting and discussions. Where progress reporting used to involve mailing or emailing paper drawings and spreadsheet reports, now you can simply circulate shared links to data on the cloud. This enables significant paperless operation. Because all stakeholders can reference the same latest data, communication errors and discrepancies such as “I don’t have the latest version” can be avoided. Also, because data are fully digitized and organized, importing into CAD software and the drawing process are more efficient. Connecting surveying through to drawing creation and reporting digitally enables outputs that are far faster and more accurate than before. Additionally, once accumulated, 3D data are safely stored in the cloud, making it easy to refer to past site conditions for future maintenance or renovation planning—enabling secondary use as a digital archive. Leaving on-site information as a digital archive further expands the possibilities for information sharing and utilization. Reducing paper materials substantially also cuts costs, and automatic cloud backups provide the added benefit of reducing the risk of data loss.

Summary

Above, we introduced five points on how smartphone surveying can streamline plan view creation.

In summary, the main advantages of smartphone surveying are:

• Low adoption barrier and easy operation for anyone

• Efficient on-site measurement with small teams and short timeframes

• Ensuring accuracy and quality using GNSS and AR

• Expanding safe data acquisition to include hazardous locations

• Rapid information sharing and drawing creation via the cloud

These advantages should make clear how much time and effort can be reduced in on-site plan view creation. If you aim to reduce the labor of surveying and drawing production, leveraging smartphone surveying is unavoidable. The flow of surveying using smartphones and digital technology will increasingly penetrate job sites, contributing to improved operational efficiency and workstyle reform. Smartphone surveying truly can be described as a trump card for promoting on-site DX (digital transformation).

When actually introducing smartphone surveying, you can more smoothly digitize on-site operations by using the simple surveying functions of LRTK. LRTK’s simple surveying features include useful tools such as photo positioning, coordinate recording, cloud synchronization, and monopod measurement, enabling surveying through drawing and sharing with just a smartphone. LRTK solutions have seen expanded use in recent years across civil engineering, construction, and infrastructure management sites—for example in assessing damage from earthquakes. They also comply with the Ministry of Land, Infrastructure, Transport and Tourism’s 3D as-built management guidelines, so data obtained on site can be submitted as official deliverables (with compatibility for CAD software and BIM/CIM models). By combining a dedicated small device and an app, even those without specialist knowledge can quickly begin simple yet high-precision surveying with a smartphone. Take advantage of practical LRTK solutions with low adoption barriers to experience the efficiency gains in plan view creation and as-built management. The future in which surveying is transformed by a single smartphone has already begun.