Geosun GS 100G 120m Handheld SLAM LiDAR Scanner

Portable SLAM LiDAR for indoor and outdoor 3D mapping

The Geosun GS-100G is a handheld mobile LiDAR scanning system developed for surveyors, construction professionals, engineers, GIS teams, mine operators and other users who need to capture detailed 3D information quickly while moving through a site. Instead of measuring individual points from a tripod, the operator can walk through the survey area while the GS-100G continuously records the surrounding geometry and builds a point cloud.

The system combines LiDAR, GNSS, inertial positioning and SLAM algorithms in one portable unit. This allows it to work both outdoors where satellite positioning is available and indoors, underground or around structures where GNSS signals can become unreliable or disappear completely.

120 metre LiDAR range

The GS-100G provides a maximum measuring range of approximately 120 m, with the manufacturer specifying around 80 m range at 10% target reflectivity. This makes the scanner suitable for rooms and buildings as well as larger industrial spaces, tunnels, underground workings, stockpiles and outdoor terrain.

A longer working range is useful when surveying large structures or open spaces because the operator can capture surfaces from farther away instead of having to walk close to every object. Actual usable range depends on surface reflectivity, lighting, geometry and environmental conditions.

Up to 640,000 points per second

The 16-channel LiDAR sensor can record up to 640,000 points per second in dual-echo operation. This high acquisition rate allows the GS-100G to build dense three-dimensional representations of walls, floors, terrain, machinery, stockpiles and other objects while the operator is moving.

In practical surveying work, denser point clouds provide more geometric information for modelling and measurement. The required level of detail still depends on walking speed, distance from the object and the way the survey route is planned.

SLAM mapping without permanent GNSS reception

One of the main advantages of the GS-100G is its use of SLAM technology. SLAM stands for Simultaneous Localization and Mapping. As the scanner moves, the system compares surrounding geometry between successive scans to estimate its movement while simultaneously building the map.

This means the scanner can continue operating inside buildings, tunnels, underground garages and mines where a conventional GNSS rover cannot maintain a satellite position. For construction and engineering teams, this provides a practical way to capture complete interiors and enclosed environments without setting up a scanner at many individual tripod positions.

SLAM RTK-SLAM and PPK-SLAM workflows

The GS-100G supports SLAM, RTK-SLAM and PPK-SLAM mapping methods. Pure SLAM is useful for enclosed environments where satellite signals are unavailable. RTK-SLAM can use real-time GNSS positioning where correction data is available, while PPK-SLAM allows GNSS trajectory information to be processed after data collection.

For mixed indoor and outdoor projects, this flexibility is especially useful. A surveyor can move from an open environment into a building or tunnel while using the positioning method appropriate to each part of the project.

Integrated GNSS and inertial positioning

The GS-100G integrates GNSS and inertial positioning alongside its SLAM engine. The published configuration uses Geosun’s gSpin positioning technology with a 200 Hz update rate and support for GPS, GLONASS, BeiDou and Galileo satellite signals.

The inertial sensors measure the movement and orientation of the scanner between GNSS updates. Together with SLAM, this helps maintain a continuous trajectory as the operator walks through the survey environment.

Wide field of view for complete surroundings

The LiDAR scanner provides approximately 360° horizontal and 270° vertical coverage. This wide field of view allows the GS-100G to capture surfaces around, above and below the operator while moving through the site.

For indoor surveys this helps record walls, ceilings, floors, structural elements and installations in a single walking workflow. In tunnels and underground environments it allows the scanner to capture most of the surrounding profile without continuously aiming the instrument manually.

Integrated cameras for colour and visual context

The current GS-100G configuration includes three integrated 5 MP cameras. The images provide visual information that can be combined with the geometric LiDAR data to make the resulting point cloud easier to interpret.

Colour information can be particularly useful when inspecting buildings, utilities or industrial environments because it helps users recognise materials, markings and physical features that may be difficult to distinguish from geometry alone.

Useful for construction and building surveys

On construction sites, the GS-100G can be used to document existing conditions, capture building interiors and record completed work. Because scanning takes place while walking, large areas can be documented quickly compared with workflows that require many separate static scanner positions.

The resulting point cloud can provide a spatial record for engineering, renovation, BIM-related workflows, dimensional checks and progress documentation. The suitability of the data for any particular tolerance should always be checked against the accuracy requirements of the project.

Underground mines tunnels and GNSS-denied environments

The GS-100G is particularly well suited to environments where satellite positioning cannot be relied on. Geosun has used the system for underground mine development, tunnel scanning and indoor coal-stockpile surveys.

In these environments, operators can walk through passages and enclosed spaces while SLAM maintains the scanner trajectory. This reduces the dependence on permanent GNSS reception and can make data collection considerably more practical in narrow or difficult-to-access locations.

Stockpile and volume measurement

LiDAR point clouds can also be used to model stockpiles, excavations and bulk materials. Once the surfaces are captured and processed, compatible software can be used to calculate volumes or compare surveys from different dates.

This is useful for mining, quarrying, earthworks, recycling facilities and construction projects where regular volume measurements are required and walking around the site with conventional survey equipment would take considerably longer.

Topographic and infrastructure mapping

Although the GS-100G is primarily designed as a handheld scanner, its integrated GNSS and SLAM capabilities also make it useful for outdoor mapping. Typical applications include topographic surveys, infrastructure documentation, power-line environments and general spatial data acquisition.

For outdoor work, GNSS information can provide a geographic reference while SLAM maintains detailed local mapping. The combination is especially useful when the survey route repeatedly moves between open areas and locations partly obstructed by buildings, vegetation or infrastructure.

Portable design for fieldwork

The GS-100G is designed to be carried by one operator and can also be used in backpack-style configurations. Current Geosun technical information lists the complete system at approximately 2.2 kg, with around 2 hours of battery operation, 128 GB internal storage and an operating temperature range from approximately -20°C to +55°C.

This portability makes the system suitable for surveys where carrying a larger terrestrial laser scanner, tripod and multiple accessories would be inconvenient.

Point-cloud processing workflow

After scanning, the recorded trajectory, LiDAR measurements and image data are processed into a usable three-dimensional point cloud. Geosun provides Point Cloud Creater software for point-cloud preprocessing, while the resulting data can then be taken into compatible CAD, GIS, BIM, engineering, mining or specialist point-cloud software depending on the required deliverables.

Careful survey planning remains important with any SLAM system. Walking loops, maintaining sufficient overlap between scanned areas and revisiting previously mapped geometry can help the SLAM algorithm maintain a consistent trajectory, especially in long corridors or environments containing repetitive features.

Who is the Geosun GS-100G for?

The GS-100G is a practical option for surveyors, construction companies, BIM teams, engineers, mining professionals, GIS users and mobile-mapping specialists who need a faster way to document complex environments in three dimensions. It is particularly useful for projects that combine indoor and outdoor areas or where GNSS reception cannot be maintained throughout the complete survey.

Buying the Geosun GS-100G from Global GPS Systems

Selecting a SLAM scanner should be based on the required accuracy, site size, working environment, final deliverables and processing workflow. Global GPS Systems can help determine whether the Geosun GS-100G fits your project and advise on the appropriate surveying workflow, GNSS setup and point-cloud processing requirements for your application.