How Japanese Railway Users Achieve Efficient Centimeter-Level Station Surveying with the MVP S1. A Practical Transition from Discrete RTK Point Collection to Continuous Spatial Modeling in Complex Railway Environments.
How Japanese Railway Users Achieve Efficient Centimeter-Level Station Surveying with the MVP S1Peter Yang, Tersus GNSS 24 July, 2026
A Practical Transition from Discrete RTK Point Collection to Continuous Spatial Modeling in Complex Railway EnvironmentsIntroduction: Railway Surveying鈥擳he Dual Demand for Efficiency and CompletenessIn surveying projects related to railway infrastructure, the operational targets often possess three distinct characteristics: spatial continuity, structural complexity, and limited operational windows.
A railway surveying service provider in Japan, in its routine station renovation and facility maintenance projects, had long relied on a combination of traditional RTK GNSS and Total Stations to complete measurement tasks. Although this mode performed stably in terms of point accuracy, its efficiency and the completeness of the results gradually became constrained when facing scenes with highly dense platforms, tracks, and auxiliary facilities.
Against this background, the client introduced the MVP S1 Handheld Mobile SLAM 3D Laser Scanning System into their actual projects, forming a new surveying workflow within the railway station environment.
01 | Project Background: Typical Surveying Requirements for Japanese Railway StationsThe project is located in a typical operating railway station area in Japan. The surveying scope covers:
Platform edges and structures adjacent to tracks.Station-front roads and pedestrian areas.Multiple existing control elements such as boundary markers and inspection manholes.
Project Characteristics:Continuous Station Operation: Limited working time windows.Occlusion: Partial areas feature rain canopies and building occlusion.Dynamic Interference: Frequent pedestrian and vehicle traffic causes significant dynamic interference.The client's core requirement was not just to acquire coordinates for a few control points, but to obtain complete spatial data in a single field operation that could be used for design, verification, and subsequent analysis.
02 | Practical Issues Faced by the Existing WorkflowBefore introducing the MVP S1, the client mainly adopted the following methods:
Point-by-point RTK GNSS collection.Supplemented by Total Stations in occluded areas.During actual project execution, the following problems gradually emerged:
Restricted Field Efficiency:
Each target point requires centering and confirmation of a fixed solution. The sheer number of points directly prolongs operation time.
Discrete Result Information:The final deliverables consist mainly of point coordinates, lacking an expression of the overall relationship between platform structures, road undulations, and surrounding facilities.
Insufficient Environmental Adaptability:Under platform eaves or near building edges, GNSS signal stability degrades, increasing the probability of needing multi-device coordination and return visits to the site.
03 | Solution: A Mobile Surveying Approach Centered on RTK-SLAMIn this project, the client adopted the MVP S1 as the primary field acquisition device and used its RTK-SLAM operating mode to complete the surveying task.Changes in Operational Method:
Surveyors hold the device and complete the scan along the station and surrounding areas at a normal walking speed.
There is no need to stop at target points like manholes or boundary markers.
The system continuously captures LiDAR, IMU, and positioning data while walking.
Technical Implementation Logic:
In areas with good GNSS conditions, RTK provides an absolute coordinate reference.In partially occluded areas, the SLAM algorithm maintains trajectory continuity.Multi-sensor data is fused and calculated through high-precision time synchronization.The final result is a set of continuous, high-density 3D point cloud data with a true coordinate reference, covering the entire station and its auxiliary areas.04 | Data Quality: Consistency with Existing Control Results"Can mobile scanning accuracy truly replace RTK at this level?" This is the primary concern for all professional surveyors. To verify this, we conducted a rigorous comparison between the MVP S1 point cloud data and Ground Control Points (GCPs) measured by high-precision RTK GNSS receivers, focusing on the spatial consistency of key features.
Results Show:Overall Accuracy Performance:Compared with ground truth values, the standard deviation of absolute coordinate error for the MVP S1 in RTK-SLAM mode is only 3 cm. This means that in the vast majority of engineering applications, it is fully capable of replacing traditional RTK point collection.
The absolute planar accuracy standard deviation is approximately 3 cm.Most key points show planar deviations concentrated in the 2鈥? cm range.The maximum deviation is controlled within 10 cm.The point errors show no obvious directional bias or systematic accumulation.Detailed Error Analysis (Sampled Real-World Data):We selected specific feature points in the point cloud to compare with the truth values:
Manhole 01: North deviation dN = -0.014m, East deviation dE = -0.001m. This means the deviation in the horizontal direction is almost negligible.Boundary Marker 04: North deviation dN = 0.001m, East deviation dE = 0.002m. The error is merely millimeter-level.Boundary Marker 02: Deviation is controlled at around 2 cm 锛坉N = -0.022m, dE = 0.020m锛?Statistically, the average deviation (Ave) of all checkpoints is extremely low, with dN at only -0.004m and dE at 0.006m. This proves that the MVP S1's trajectory calculation possesses extremely high robustness and is free from systematic drift.
This result satisfies the accuracy requirements for engineering applications such as railway station status surveying, renovation design, and facility management.
05 | For the Customer, the Change Goes Beyond AccuracyFrom "Point Collection" to "Recording the Space Itself"Previously, only limited coordinate point results were retained after the project ended. With the MVP S1, the client obtains a complete spatial data asset that can be repeatedly utilized. If supplementary measurements or detailed verification are needed later, there is no need to re-enter the site.
Previously, surveyors could only bring back dozens of coordinate points; now, using the MVP S1 to walk a lap brings back a digital twin model of the entire railway station. Missed a street lamp? No need to return to the site; simply measure it directly in the point cloud.Field Operation Organization Significantly Simplified
Single-person operation completes measurement tasks that originally required multi-person collaboration.No need to frequently switch devices or change operating modes.Field time is significantly shortened, making project scheduling more controllable.
Enhanced Tolerance for Complex EnvironmentsEven in areas with tree coverage or building dead zones, the RTK-SLAM algorithm can maintain stable loop closure, eliminating anxiety about "signal dead zones." This makes surveying work closer to real-world operational scenarios.Conclusion: A Surveying Method More Aligned with Railway Engineering RealityFor this Japanese railway user, introducing the MVP S1 was not merely replacing a device, but an adjustment of the operational mode.When mobile scanning can stably provide centimeter-level absolute accuracy in actual projects while simultaneously outputting complete and continuous spatial results, the value boundary of surveying work is significantly expanded.In the field of railway infrastructure鈥攚here requirements for efficiency, accuracy, and safety are extremely high鈥攖his surveying method is becoming a realistic, feasible, and worthy new choice for sustained investment.
About Tersus GNSS Inc. Tersus GNSS is a leading Global Navigation Satellite System (GNSS) solution provider. Our offerings and services aim to make centimeter-precision positioning affordable for large-scale deployment.
Founded in 2014, we have been pioneers in design and development GNSS RTK products to better cater to the industry鈥檚 needs. Our portfolios cover GNSS RTK & PPK OEM boards, David GNSS Receiver, Oscar GNSS Receiver, MatrixRTK [GNSS CORS Systems] and inertial navigation systems.
Designed for ease of use, our solutions support multi-GNSS and provide flexible interfaces for a variety of applications, such as UAVs, surveying, mapping, precision agriculture, lane-level navigation, construction engineering, and deformation monitoring.
Sales inquiry: sales@tersus-gnss.comTechnical support: support@tersus-gnss.com
