How Designers Use LRTK: Why Exterior Planning Is Changing

In exterior design, understanding site conditions and conducting accurate surveys determine whether a plan succeeds or fails. If you don’t correctly grasp site shape, elevation changes, boundary lines, and existing structures, a carefully drawn exterior plan can end up not fitting the actual site and require rework. As an exterior designer myself, I’ve long felt the burden of traditional field surveys and the limitations of survey accuracy. But recently, the emergence of high-precision positioning systems for smartphones—LRTK—has begun to transform the exterior planning process. In this article I’ll explain those concrete changes and benefits from a designer’s perspective.

Field surveys are essential to exterior design

In exterior work (residential landscaping and yards), it’s crucial to start with on-site investigation and surveying to accurately understand the current conditions. Besides site dimensions and shape, there are many factors that affect design: boundary locations with neighboring properties, placement of buildings and walls, ground elevation changes and slopes, drainage, existing trees and retaining walls, and more. If these are not identified in advance and reflected on plans, issues can arise during construction such as “the fence extends into the neighbor’s lot” or “drainage fails because the slope was misread.” In particular, confirming site boundaries and measuring elevation differences are important to avoid neighbor disputes and to manage stormwater—small errors can cause major problems.

Therefore, precise surveying and thorough verification are indispensable in field surveys. You need to carefully collect the data that underpins the design drawings: locating boundary stakes, measuring setback distances from buildings, and leveling ground heights, among other things. For exterior designers, field surveying is unglamorous work, but neglecting it leads to corrections and rework later in the process and can undermine trust with clients. High-quality proposals are backed by accurate field surveys.

Traditional surveying methods and their challenges

However, the traditional surveying methods we designers have faced come with many challenges. Typical on-site exterior surveys are done manually using tape measures, laser distance meters, and levels, or by hiring a surveyor to use specialized equipment like a total station. In the former case, surveying a large site often requires at least two people, and the cycle of measure → mark → measure again consumes significant time. Tape sag or repeated remeasurements introduce small errors—human labor and mistakes are unavoidable. Even when hiring a professional surveyor, scheduling and outsourcing costs arise, and if anything is missed you must call them back, so the approach lacks mobility.

Traditional surveying also carries an ongoing risk of human error. For example, misreading handwritten notes or copying numbers incorrectly from a tape measure can easily create centimeter-level discrepancies. Even experienced craftsmen cannot completely eliminate errors inherent in manual work. In dense urban sites, physical constraints—such as buildings or fences preventing a straight run of the tape or blocking sightlines—further complicate measurement. As a result, some measurements were sometimes estimated or remeasured later, which was inefficient.

Against this backdrop of limitations, exterior designers commonly wished for “a more accurate, faster way to complete site surveys” or “to measure everything correctly once and for all.” Responding to that need are devices that leverage RTK (Real-Time Kinematic) positioning technology—the latest in surveying tech.

What is LRTK, high-precision surveying on a smartphone?

As RTK-GNSS satellite positioning corrections have become more accessible, small surveying devices usable with smartphones have recently appeared. The representative example is LRTK. LRTK is a positioning system that attaches an ultra-compact RTK-GNSS receiver—small enough to fit in your pocket—to a smartphone, enabling designers to perform centimeter-level surveying easily. A dedicated case-type device snaps onto a smartphone with one touch, eliminating messy wiring and letting you start quickly. It weighs only a few hundred grams, so it’s lightweight to carry. Because it’s so compact, it’s often called a “survey instrument that fits in your pocket,” and the idea of each designer carrying one in their pocket to the site has become realistic.

With the LRTK device and its dedicated app, a smartphone instantly becomes a high-precision surveying instrument. The RTK method uses real-time satellite correction information to reduce the meter-level errors of standalone smartphone GPS down to centimeters. For example, you can simply point your phone at a target point and tap a button to instantly obtain the latitude, longitude, and elevation of that location. Centimeter-level accuracy rivals that of experienced surveyors and is trustworthy as foundational data for design drawings. The app also displays satellite reception status and positioning accuracy, making it user-friendly so even beginners can reliably ensure precision.

How high-precision surveying and point-cloud scanning change the design process

The remarkable thing about LRTK is that it doesn’t just measure points’ coordinates; it can digitize the entire site. By integrating with a smartphone camera or LiDAR sensor (on supported models), you can record surrounding structures and terrain as 3D point-cloud data simply by walking the site. Point-cloud measurement, which previously required expensive 3D laser scanners, can now be achieved easily with an LRTK-smartphone combination. I actually scanned a residential exterior with LRTK and was amazed at how accurately features from gateposts and trees to ground undulations were reproduced in the data.

This point-cloud data is highly useful for later design work. For example, you can measure distances between any two points in the captured cloud or analyze elevation differences freely. That greatly reduces the chance of “we forgot to measure that area and need to revisit the site.” Once scanned, you can review the data back at the office and extract dimensions. Also, overlaying the point cloud with conventional CAD data makes it easy to verify whether a planned design fits the existing conditions. For instance, you can simulate on the point cloud whether the planned carport column positions suit the actual site and prevent mistakes in advance. LRTK’s combination of high-precision surveying and point-cloud scanning digitizes the site “as-is” and integrates it into design, dramatically improving planning accuracy and efficiency.

LRTK also streamlines the surveying process itself. What once required a surveying team and a half-day can now be completed quickly by a single designer. Even when thoroughly measuring a site, it often takes only tens of minutes to an hour; for simple terrain it may take just a few minutes to capture key points. There’s no need to lug a heavy tripod, and you can survey nimbly in narrow spaces or at height, enabling you to tackle detailed site measurements you might previously have avoided. The era when “surveying had to be left to specialists” is giving way to an era where “you can quickly measure it yourself when needed,” and the design process itself is beginning to change.

Better proposals through cloud use and AR sharing

Another advantage of LRTK is that the data you capture can be uploaded to the cloud immediately. With a single tap in the smartphone LRTK app, you can save and share survey results, point clouds, and site photos to your company cloud—eliminating the need to return to the office and transfer data via USB. Coordinates measured on site are plotted on a cloud map in real time, allowing all team members to view them right away. In my office, for example, the designer who surveys with LRTK in the morning can have another staff member start creating CAD drawings from the cloud data in the afternoon—enabling swift collaboration. Connecting field and office in real time has significantly increased overall project speed.

Accumulating data in the cloud also makes it easy to manage survey histories. If you later want to recheck data from a previously measured site, you can log in to the cloud and retrieve point clouds and measured points saved by date and location. There’s no hunting for paper field notebooks and no worry about data loss. For designers, having the site data they worked on preserved as an asset is reassuring, and it contributes to knowledge accumulation by allowing past data to be referenced for similar projects.

LRTK combined with AR (augmented reality) revolutionizes exterior presentations. You can overlay 3D models of the designed exterior onto live images of the actual site in a smartphone or tablet view. While perspective drawings and CG renderings have long been used to convey images, AR lets you project the plan directly onto the site, drastically improving client understanding. For example, you can show a client a future terrace or garden as a “completed view” through a tablet while standing on the site. Thanks to LRTK’s centimeter accuracy, AR-displayed designs align precisely with reality without positional drift, producing a realism as if the work were already built. This often leads clients to say, “That’s exactly what I imagined—let’s go with this plan,” and consensus-building proceeds much more smoothly.

As an AR application example, you can also visualize buried utilities. Exterior work sometimes encounters underground pipes and cables; by surveying their positions with LRTK beforehand and displaying them on the ground via AR, constructors and designers can intuitively share information such as “the sewer runs from here to here.” Such uses improve the quality of proposals and meetings and smooth communication among designers, clients, and contractors.

Planning that accounts for retaining walls, steps, and slopes

Exterior planning must consider elevation differences and the relationship between structures. For example, if there is a retaining wall near the boundary with a neighboring lot, misjudging its height or position can affect fence placement and how soil is mounded. Where steps or level changes occur within a site, you must consider circulation and accessibility, and the overall slope determines whether drainage routes need careful design. When earthworks (cutting or filling) are involved, you need accurate calculations of how much soil to move.

Detailed site data from LRTK is extremely helpful when evaluating these elements. You can extract the exact top-of-wall elevation and location of a retaining wall from point-cloud data and adjust new fence or garage floor heights to the millimeter. Ground slope can be calculated from point-specific elevation data, letting you make quantitative judgments such as “this area has a 2% slope so drainage is acceptable.” Step heights are immediately obvious, enabling you to include slope or ramp measures as needed.

Particularly useful are earthwork volume calculations and cut-and-fill analysis. Creating a ground elevation model from captured point clouds lets you automatically compute the volume of soil to be moved by comparing it to planned design elevations. Where earthwork was once estimated roughly by rule of thumb or manual calculation, LRTK data now yields high-precision quantities, leading to well-balanced plans. As a result, omissions in considering retaining walls or slopes have decreased and the accuracy of planning at the design stage has improved markedly. I used to be willing to compromise with “we’ll fine-tune heights once construction starts,” but now I can simulate in advance and find optimal solutions. Because LRTK captures the site comprehensively, designers can concentrate on planning with confidence.

Case studies: LRTK shines on narrow lots and sloped sites

From my experience using LRTK, its strength is its flexibility on any site. On a narrow urban lot where previously I would have needed another person to measure every corner or struggled to fit into gaps by neighboring houses, LRTK allowed me to handle everything alone. With a phone in hand, I walked the site and recorded measurement points even in tight passages and right up against buildings, obtaining accurate site plans and terrain data in a short time. Because nothing was left unmeasured, I had all the information in one pass, avoiding later additional surveys or client queries and meeting tight schedules for plan submission.

On sloped sites, LRTK’s true value was especially clear. Traditionally, leveling many points to produce contour lines was laborious, but by scanning the entire terrain with LRTK point clouds I could immediately grasp slope gradients and the shape of valleys and embankments. Using that data, I planned stair placements and retaining wall additions to eliminate level changes and validated them with three-dimensional models from the planning stage, significantly strengthening the persuasiveness of proposals. 3D model-based reviews also help client explanations; visually showing, for example, “we’ll cut the slope this much to make it flat,” eases client concerns. Exterior work on slopes used to be high-risk and approached cautiously, but LRTK enabled confident proposals in such cases.

LRTK is also useful for typical residential exterior renovations. For a garden renewal project, I recorded the positions of existing stones and plantings as a point cloud to evaluate how much to relocate or remove them. Overlaying old and new plans on the point cloud allowed quick interference checks with existing elements, enabling rational planning that avoided unnecessary work. From narrow lots to sloped sites to renovation sites, LRTK has become a powerful ally for exterior designers in many scenarios.

The usefulness and future of LRTK from a designer’s viewpoint

From an exterior designer’s perspective, LRTK’s immediate responsiveness and versatility stand out. The reassurance of being able to measure it yourself when needed, and the convenience of data flowing seamlessly from surveying to design, construction, and presentation, make it indispensable once experienced. The app is intuitive even without specialized knowledge; complex coordinate transformations and surveying calculations are automated. Young staff and those new to surveying can master it quickly, so the organizational barrier to adoption is low. In fact, I often hear from colleagues, “I was skeptical at first, but after trying it, everyone in the firm can survey now and our efficiency has improved.”

Across the industry, simple high-precision surveying tools like LRTK are likely to become standard. As construction industry DX (digital transformation) advances—promoted by initiatives such as the Ministry of Land, Infrastructure, Transport and Tourism’s i-Construction—an environment where anyone can perform accurate surveying is essential. While exterior surveying used to rely on experienced craftsmen, the future will let newcomers achieve results comparable to veterans in a short time by using digital tools. LRTK’s simplified surveying is emblematic of this shift.

In exterior planning, LRTK supports the entire workflow from site investigation to design, presentation, and construction follow-up. Once you experience its benefits, it becomes an indispensable partner for designers. Since I started using LRTK, I feel lighter going to sites and more confident in proposals. I encourage you to adopt this easy-to-use surveying tool and experience improved efficiency and quality across your work. You’ll be surprised by its ease and accuracy, and it will likely change how you approach exterior design. The wave of simplified surveying with LRTK is steadily spreading, and I strongly feel it may become the standard style in the exterior industry in the near future.

Detailed product information and case studies are available on the [LRTK official site](https://www.lrtk.lefixea.com). If you’re interested, please check it out. Why not bring LRTK’s new approach to planning into your design site?