Is a Pro model really necessary? The reality of LRTK surveying

Table of contents

• Differences between Pro models and standard models

• Cases where Pro models shine

• Reasons you can be fine without a Pro model

• Built-in smartphone LiDAR and the current state of surveying

• What is LRTK surveying?

• Benefits brought by LRTK surveying

• Simple surveying with LRTK

• FAQ

Introduction

Smartphone Pro models pack many advanced features, from cameras to displays. However, they also come with higher prices, so many people wonder whether buying a Pro model is really necessary. This article explains the situations where Pro models demonstrate their true value and the cases where standard models suffice. We focus particularly on the increasingly popular field of surveying with smartphones (accurate measurement of position and distance), examining the real-world use and limitations of Pro-model built-in LiDAR sensors and the new LRTK surveying technology that overcomes those limits. Let’s look together at how far you can go with a smartphone even without a Pro device, and at the latest high-precision positioning technologies.

Differences between Pro models and standard models

First, let’s summarize the main differences between Pro models and standard models (base models) in smartphones. Generally, Pro models have enhancements in the following areas.

• Advanced camera functions: Pro models offer stronger camera performance compared to standard models. For example, they may include multiple lenses (wide, ultra-wide, telephoto) for flexible shooting, larger sensor sizes for improved low-light performance, RAW shooting support, and other features that meet professional photo and video needs.

• LiDAR scanner: Recent iPhone Pro series (from iPhone 12 Pro onward, etc.) include a LiDAR sensor. LiDAR measures distance to objects quickly using infrared lasers, helping AR apps instantly 3D-scan the surrounding space or measure subject depth. Standard models lack this LiDAR, so the same AR apps may show differences in plane detection speed and low-light measurement ability.

• Display and body specifications: Pro models often have higher-resolution, higher-refresh-rate displays (e.g., 120Hz ProMotion), improving smoothness and display quality. Body materials (stainless steel or aluminum), finish, storage options, and memory capacity may also be more generous on Pro models.

• Processor performance: Depending on the model and generation, Pro models sometimes use the latest high-performance chips or have better GPU performance than same-generation standard models. However, recently standard models also adopt sufficiently fast processors, so the perceived difference in everyday use is often small.

As above, Pro models mainly have advantages in camera/sensor performance and display quality. So in what situations are these enhancements necessary?

Cases where Pro models shine

Pro models are most beneficial for users who fully utilize advanced features or for specialized use cases. Specific examples include:

• Serious photo and video production: For professional or advanced amateur photographers and video creators, Pro models with higher-performance camera systems and image processing are attractive. Telephoto zoom, RAW shooting, and low-light performance enable Pro models to capture high-quality results in scenes that are difficult for standard models.

• AR and 3D scanning use: In construction or civil engineering sites using AR surveying apps, or for interior designers performing room 3D scans, the LiDAR sensor on Pro models is powerful. LiDAR can quickly capture point-cloud data of spaces, yielding more accurate AR experiences and scan results than standard models.

• Heavy use and high-load tasks: If you edit video on your phone, play 3D games at top settings, or run multiple advanced apps for business, a Pro model’s faster chip and larger memory contribute to stable operation. Differences in thermal design and battery life under prolonged use also matter for heavy users.

In short, Pro models demonstrate real value when you assume “professional-level usage.” But for general users who are not that specialized, how often is a Pro model truly necessary?

Reasons you can be fine without a Pro model

In conclusion, for many general users, standard models provide sufficient functions and performance for daily use. There are certainly things only Pro can do, but it’s important to calmly consider whether those match your usage. For the following reasons, many people can decide that they don’t need a Pro.

• Standard models are already high-performance: Current standard smartphones comfortably handle SNS, web browsing, video streaming, and light photography. Even models from a few years ago perform adequately for everyday use. High-performance Pro chips are often underutilized in typical scenarios.

• You may not fully use Pro features: Pro-exclusive features like LiDAR-based full space scanning or RAW shooting can go unused unless you employ them professionally. For example, standard models take perfectly nice travel photos, and everyday AR app use is practically fine on standard models. Don’t choose an expensive Pro solely for “might use it” features.

• Cost and priorities: Pro models are expensive, and adding storage or accessories increases the cost. With a limited budget, investing in other gadgets (e.g., a camera gimbal, external lens, or other productivity tools) may yield higher overall satisfaction. It’s wise to resist the impulse to buy the top model and instead determine which features you truly need.

From these points, it’s clear that for many people, a standard model suffices. If top-tier features are rarely used, there may be alternative ways to achieve the same goals without buying an expensive Pro. One notable example is the increasingly popular case of surveying with a smartphone.

Built-in smartphone LiDAR and the current state of surveying

The LiDAR sensor included in smartphones—particularly in the iPhone Pro series—is a revolutionary tool that can instantly 3D-scan the surrounding environment. For example, the iPhone’s “Measure” app makes it easy to measure room dimensions or furniture size. The LiDAR scanner on Pro models can detect planes quickly and measure distances even in low light, making it powerful for AR measurements and simple indoor scans.

However, this standalone smartphone LiDAR measurement currently has several limitations. In particular, for full-scale outdoor surveying (mapping or precision position measurement for civil engineering), the following issues are pointed out.

• Position information is coarse: The smartphone’s built-in GPS (satellite positioning) alone can have errors on the order of a few meters (a few ft). Even if LiDAR captures detailed point-cloud data, if the associated position coordinates are off by a few meters (a few ft), the data cannot be used as accurate maps or drawings.

• Error accumulation during wide-area scans: Smartphone AR tech estimates its position using the camera and gyro while scanning. That’s fine in tight indoor spaces, but when walking around and scanning a wide area, the position estimate can gradually drift and distort the point cloud. For example, when scanning all around a building by walking a loop, the start and end point clouds may not perfectly align. This error arises because the smartphone alone cannot determine its absolute position with high accuracy.

• LiDAR effective range and environment: Smartphone LiDAR generally has an effective range limited to about a radius of 5 m (16.4 ft). Distant objects may not be captured as points or may have coarse resolution. Under strong outdoor sunlight, LiDAR’s infrared can suffer noise and reduced measurement accuracy. In other words, smartphone-only LiDAR may not cover vast sites or outdoor surveying well.

Thus, smartphone-based measurements trade convenience for limitations in position accuracy and coverage range. On the other hand, technologies that overcome these limitations and enable near-professional surveying accuracy with a smartphone are emerging. The key is the high-precision positioning technique called RTK.

RTK (Real Time Kinematic) is a method that dramatically improves GPS positioning accuracy using correction information. A high-precision receiver installed at a known base station gathers satellite signals and provides real-time corrections to the mobile unit’s GPS, reducing position errors from several meters (several ft) to several centimeters (several in). Previously, using RTK on site required setting up your own base station or using expensive dedicated equipment. Recently, however, “network RTK” services that provide correction information over the Internet have become widespread, making RTK relatively easy for individuals to use.

So what happens if you combine RTK with a smartphone? The answer is that the smartphone becomes a high-precision surveying device. If a smartphone’s GPS is corrected by RTK to keep position error within a few centimeters (several in), you can tag LiDAR or camera-acquired data with accurate coordinates. This could allow you to obtain 3D data with accuracy comparable to professional surveying instruments simply by walking and scanning with a smartphone.

What is LRTK surveying?

This is where the new smartphone + RTK surveying solution called LRTK appears. LRTK, a name that implies “LiDAR + RTK,” involves attaching a compact RTK-GNSS receiver (high-precision GPS receiver) to a smartphone to enable centimeter-level positioning (cm level accuracy (half-inch accuracy)). As a concrete product example, a pocket-sized device called the LRTK Phone has been developed; attaching it to an iPhone or iPad enables high-precision position information on the spot. It weighs about 125 g and has a thickness of about 1.3 cm (0.5 in), and can be attached with a dedicated phone case for one-touch mounting. Because it integrates with your smartphone and is portable, it’s convenient to carry and use whenever needed.

By attaching LRTK to a smartphone and using a dedicated app, anyone can easily perform high-precision positioning and surveying. For example, you can point an LRTK-equipped smartphone at the location you want to measure and tap a button to record that point’s latitude, longitude, and elevation with centimeter accuracy (cm level accuracy (half-inch accuracy)). The recorded coordinates are instantly plotted on a map and can be uploaded to the cloud for sharing. Furthermore, if the smartphone has LiDAR, you can scan the surroundings to obtain a 3D point cloud while assigning accurate coordinates to each point. In short, LRTK surveying aims to enable what previously required skilled surveyors with expensive equipment—precise position measurements and 3D measurement—using just a smartphone.

Benefits brought by LRTK surveying

Smartphone surveying with LRTK is spreading in construction sites and other fields. Technicians who have used it on site express surprise at its convenience and power. The main benefits of LRTK surveying are summarized below.

• Dramatic improvement in survey accuracy: Position errors that were several meters (several ft) with a standalone smartphone can shrink to several centimeters (several in) with LRTK. This lets you obtain 3D data and measurement coordinates accurate enough for drawing plans and construction management. When collecting data over multiple days, records are kept in a consistent coordinate system so data from different days align perfectly. No longer must you compromise with “smartphone-level” accuracy.

• Improved safety and reduced labor: LRTK surveying enables non-contact, rapid measurements, greatly reducing risk in hazardous locations. For example, road measurements that previously required workers to enter a traffic lane can be done from the shoulder by scanning with an LRTK-equipped smartphone. For bridge inspections at height, instead of erecting scaffolding or using aerial work platforms, you can photograph the underside of a bridge from the ground and create a 3D model, improving safety and reducing effort. Because one person can measure quickly, LRTK contributes to shorter work times and reduced staffing.

• Revolution in efficiency and data volume: A smartphone + LRTK can cover large areas quickly by a single person. For example, a survey of a plaza that used to take multiple people half a day can be completed in tens of minutes by one person walking around with an LRTK-equipped smartphone. Point-cloud scanning automatically acquires countless measurement points, allowing cross-sections or distance measurements to be made later anywhere. The need to return to the site because “we forgot to measure that part” is reduced. Data can be shared to the cloud immediately, minimizing downtime where work stops until drawings are created back at the office, dramatically boosting overall productivity.

• Cost reduction and ease of use: Compared to specialized surveying instruments or laser scanners, smartphone-based LRTK surveying reduces initial investment and operating costs. Reducing the need to rent or purchase expensive equipment or outsource to surveying companies leads to significant cost savings. Because the platform is a smartphone that everyone is familiar with, learning to operate the equipment is easy. Site staff can handle it with short training, so operation does not require a licensed surveyor. In other words, the barrier to surveying is lowered, enabling a “one person, one device” approach so measurements can be taken whenever needed.

• Immediate use of data: Positioning and point-cloud data collected with LRTK are stored digitally and can be used immediately. For example, you can verify data on a tablet or PC right after measurement, calculate critical dimensions, or compare with existing design drawings and color-code deviations. Uploading to the cloud allows instant sharing with remote offices, smoothing collaboration between field and office. Compared to traditional methods relying on paper drawings and handwritten notes, digital data flows directly into subsequent processes, improving efficiency and sophistication across operations.

In this way, LRTK surveying makes the reality of “anyone can perform precise surveying anytime” increasingly plausible. With just a smartphone you can measure and use data as soon as the idea occurs, accelerating on-site decision-making. Technology is indeed making surveying more accessible.

Simple surveying with LRTK

Finally, here’s a summary of simple surveying using LRTK. High-precision surveying used to be the exclusive domain of experts, but now even non-specialists can perform many measurements with a smartphone and an LRTK device. For example, if you want to measure your property accurately, you previously had to hire a surveyor. With LRTK, you can walk the boundary yourself while the device records boundary points on a map and automatically calculates area. LRTK smartphone surveying is also useful for DIY projects to check land elevation changes or for measuring agricultural plots.

As shown, you can do a lot with a smartphone and some ingenuity even without a Pro model. That does not mean Pro models are unnecessary, but it is useful to know that there are alternatives depending on your goals. Especially in precision-required fields like surveying, it is remarkable that LRTK enables easy challenges. If you had given up thinking “I need a high-end device,” consider taking a look at smartphone surveying—you may find unexpected solutions or new applications.

FAQ

• Q: Who needs a Pro model? A: Pro models are suitable for heavy users who fully exploit their phones, such as those in photography/video production or advanced AR use. Pro models are particularly valuable for people who use camera performance or LiDAR in their work or specialized fields. For general everyday use, standard models are sufficiently comfortable.

• Q: What is LRTK? A: LRTK is the name for a surveying solution that uses a small high-precision positioning device attached to a smartphone. It corrects the smartphone’s position using the Real Time Kinematic (RTK) method, enabling positioning to the centimeter level (cm level accuracy (half-inch accuracy)). In short, it’s technology that transforms a smartphone into a high-performance surveying instrument.

• Q: Can LRTK be used with any smartphone? Do I need a Pro model? A: Basically, if your device (such as an iPhone or iPad) is supported, you can use LRTK even if it’s not a Pro model. LRTK itself provides the high-precision positioning, so it does not depend on the phone’s GPS performance. However, if you want to perform point-cloud scanning using LiDAR, LiDAR-equipped Pro models or an iPad Pro will be more effective. For positioning alone, non‑Pro smartphones can still achieve centimeter-class accuracy.

• Q: Can people without specialist knowledge perform surveying? A: Yes. With LRTK, people without specialist knowledge can perform measurements relatively easily. Dedicated apps guide users with intuitive UIs, so you can record coordinates by pressing a button at each point. Obtained data are automatically plotted on maps and displayed numerically, so difficult calculations or drawing skills are unnecessary. With minimal operation knowledge, anyone can perform basic surveying tasks.

• Q: How reliable is smartphone surveying accuracy? A: When using LRTK, theoretically you can expect high accuracy—horizontal positions within several centimeters (several in) and vertical within several tens of centimeters (several tens of in). In practice, examples report being able to determine positions with errors under 5 cm (less than 2.0 in) in open areas. This is a dramatic improvement over conventional smartphone GPS errors (several meters (several ft)). However, accuracy can vary with surroundings and satellite reception conditions, so best-case results are not guaranteed every time. Still, for most practical uses, the accuracy is sufficiently reliable.