Geosun GS 200G Lightweight RTK SLAM LiDAR Scanner

Lightweight handheld SLAM LiDAR for professional 3D mapping

The Geosun GS-200G is a compact mobile LiDAR scanner developed for surveyors, construction professionals, engineers, BIM teams, GIS users and 3D-mapping specialists who need to capture complete environments quickly. Instead of measuring individual points or repeatedly repositioning a static laser scanner, the operator can walk through the project while the GS-200G continuously records surrounding geometry and builds a three-dimensional point cloud.

At only 1.0 kg, the GS-200G is designed to be easy to carry during longer surveys. LiDAR, GNSS, inertial positioning, cameras and SLAM processing are integrated into one unit, so there is no need to carry a separate computer or large external sensor pack during normal field collection.

Livox Mid-360 LiDAR scanner

The GS-200G uses the Livox Mid-360 laser scanner. It provides full 360° horizontal coverage with a vertical field of view from approximately -7° to 52°, allowing the system to capture floors, walls, façades, ceilings, terrain and surrounding objects while the operator moves through the site.

The LiDAR measures up to approximately 40 m on surfaces with 10% reflectivity, while Geosun specifies around 70 m on higher-reflectivity targets. This makes the GS-200G practical for rooms, buildings, streets, industrial areas, tunnels and other environments where most surfaces are within tens of metres of the operator.

200,000 points per second

The scanner records up to 200,000 points per second using a non-repetitive scanning pattern. As the operator walks, the LiDAR continuously fills in the surrounding geometry and produces a dense spatial record of the site.

For practical fieldwork, point density depends on walking speed, distance to objects and how much time the scanner has to observe each part of the scene. Moving more slowly around important details or revisiting areas can provide denser coverage where required.

SLAM for GNSS-denied environments

The GS-200G uses SLAM technology to estimate its position by comparing surrounding geometry while simultaneously creating the map. This allows the scanner to continue working inside buildings, underground spaces, parking garages, tunnels and other places where GNSS signals cannot be maintained.

For surveyors and construction teams, this means a complete interior can be mapped by walking through it instead of setting up at many individual instrument positions. It is particularly useful for projects that move between outdoor and indoor environments.

SLAM RTK-SLAM and PPK-SLAM workflows

The GS-200G supports SLAM, RTK-SLAM and PPK-SLAM. Standard SLAM can be used where satellite positioning is unavailable. RTK-SLAM allows real-time GNSS corrections to be used outdoors where suitable correction data is available, while PPK-SLAM allows GNSS positioning information to be processed after the survey.

This gives users flexibility on mixed projects. A survey can start outside with GNSS positioning, continue inside a building using SLAM and return outdoors without changing to a completely different scanning platform.

Integrated gSpin 210 GNSS and INS

The GS-200G includes Geosun’s gSpin 210 GNSS/INS positioning unit with a 200 Hz update frequency. The system supports GPS, GLONASS, Galileo and BeiDou signals and provides the positioning and attitude information needed to connect the local SLAM point cloud to real-world coordinates.

The published GNSS positioning specification is approximately 2 cm horizontally and 3 cm vertically under suitable conditions. Pitch and roll accuracy are specified at 0.015°, while heading accuracy is 0.040°.

Up to 1 cm relative point-cloud accuracy

Geosun specifies the GS-200G with relative point-cloud accuracy of ≤1 cm and absolute accuracy of ≤5 cm. Relative accuracy is particularly relevant when measuring geometry within the same scan, while absolute accuracy describes how closely the overall point cloud is positioned within its coordinate system.

Actual project accuracy still depends on the survey route, environment, GNSS conditions, loop closures, control points and processing workflow. For engineering projects with strict tolerances, independent control and verification should be used where required.

Dual 20 MP cameras for coloured point clouds

The GS-200G includes two 20 MP cameras with approximately 200° horizontal and vertical image coverage. The cameras are time-synchronised with the scanning system and provide RGB information that can be used alongside the LiDAR geometry.

Colourised point clouds are easier to interpret when users need to identify construction materials, pipes, doors, road markings, façade details or other features that may appear similar when viewed only as geometric points.

Construction surveys and BIM documentation

The GS-200G is well suited to construction and building documentation. An operator can walk through unfinished or completed buildings while recording walls, floors, ceilings, openings and structural elements in three dimensions.

The resulting point cloud can support renovation planning, existing-condition surveys, design coordination, BIM development and digital-twin workflows. Because the complete environment is captured rather than only selected survey points, users can often return to the dataset later to inspect or measure features that were not the original focus of the site visit.

Indoor and underground mapping

GNSS-denied areas are one of the main applications for the GS-200G. Buildings, basements, underground parking facilities, tunnels and mine environments can be mapped without continuous satellite reception.

The wide 360° scanning coverage is useful in these environments because the operator can capture surrounding surfaces while walking naturally through corridors, rooms and larger underground spaces.

Mining and tunnel surveying

For mining and tunnel projects, the GS-200G provides a portable way to capture passage geometry, tunnel profiles, excavated areas and surrounding infrastructure. SLAM maintains the local trajectory while the operator moves through areas where a conventional GNSS rover cannot function.

The resulting point clouds can be used in compatible software for documentation, spatial analysis, profile checks, volume work and comparison between different survey dates.

Façade and infrastructure surveys

The GS-200G can also be used to capture buildings, façades and infrastructure from ground level. Its 360° LiDAR coverage allows walls, street furniture, poles and other objects around the operator to be recorded during the same walking survey.

This makes the system useful for urban mapping, asset documentation, infrastructure inspection and digital-twin projects where both geometry and visual context are required.

Topographic and outdoor mapping

Although designed primarily as a handheld SLAM scanner, the GS-200G also integrates GNSS and can be used for outdoor topographic and infrastructure work. This is particularly useful in environments where GNSS availability changes repeatedly, such as streets between tall buildings, areas beneath vegetation or locations where the operator moves between open and covered spaces.

The system can therefore bridge the gap between conventional outdoor GNSS surveying and fully indoor SLAM scanning.

Forestry and power-line applications

Geosun also lists low-canopy forestry and power-line patrol among the GS-200G applications. The mobile LiDAR workflow can record vegetation, poles, surrounding terrain and other infrastructure without measuring every feature individually.

Actual performance in vegetation depends on canopy density, working distance and whether the LiDAR has clear paths through the vegetation to the required surfaces.

Portable design for fieldwork

The GS-200G measures approximately 16.5 × 12.0 × 32.4 cm and weighs only 1.0 kg. Its low weight reduces fatigue during longer walking surveys and makes it practical for sites with stairs, narrow passages or difficult access.

The system uses a 128 GB microSD card for storage and operates from a 12–20 V supply with less than 25 W power consumption. Geosun specifies operation over a temperature range from approximately -20°C to +55°C.

Point-cloud processing workflow

After field collection, the LiDAR, GNSS, INS and image information can be processed into a usable point cloud. Geosun provides software for SLAM point-cloud processing and further point-cloud analysis, while the resulting datasets can be brought into compatible surveying, CAD, BIM, GIS and engineering applications depending on the required deliverables.

Good survey practice remains important with any SLAM system. Walking closed loops where practical, maintaining overlap between scanned areas and avoiding unnecessarily fast movement can improve trajectory consistency and the completeness of the final point cloud.

Who is the Geosun GS-200G for?

The GS-200G is particularly suitable for surveyors, construction companies, BIM specialists, civil engineers, GIS professionals, mine operators, heritage specialists and reality-capture teams that need a lightweight scanner for indoor and outdoor mapping. Its strongest advantages are its 1 kg weight, integrated RTK-capable GNSS/INS, SLAM workflow and simple handheld operation.

Buying the Geosun GS-200G from Global GPS Systems

Selecting a SLAM LiDAR scanner should be based on required accuracy, working range, project size, GNSS availability and final deliverables. Global GPS Systems can help determine whether the Geosun GS-200G fits your surveying or reality-capture workflow and advise on GNSS corrections, field collection and point-cloud processing for your application.