|Ground LIDAR Survey|
The OxTS systems for mobile mapping seamlessly integrate GNSS with inertial measurements to generate accurate and consistent position, orientation, and heading. The sensor fusion and tight-coupling allow data to be collected even in poor GNSS environments such as in forests or urban canyons. Trajectory is recorded at up to 250 Hz and synchronised with LiDAR and other external imaging sensors. Once installed, the systems can be left to operate without needing repeat configuration or maintenance.
Georeferencing Point Clouds
While LiDAR generates 3D maps and digital twins of surrounding environments; it can’t tell you where in the world the data relates to.
Assigning a geographic coordinate to a LiDAR data point requires knowledge of where and when the LiDAR sensor is – so time, position and orientation are needed at all times.
Based upon these measurements, when the pulse leaves the device and returns, and the orientation of the LiDAR unit, a real-world geographic coordinate is calculated and dynamically assigned. (A process known as direct georeferencing).
Using an INS with a LiDAR, particularly using a UAV/UAS, also offers plenty of other benefits for surveyors including:
- Reduced lower fields costs with fewer Ground Control Points
- Automation to mapping procedures
- Increase consistency of data collection
OxTS xNAV and Survey+ inertial navigation systems provide the ability to directly georeference your point cloud data in every environment.
Automatic Boresight Feature
Works with OxTS GeoCloud georeferencing software
Produce stunning point clouds (PCD / LAS format) from a Velodyne LiDAR scanner using an xNAV and the OxTS GeoCloud georeferencing suite.
Aligning LiDAR and INS for maximum point cloud accuracy
GeoCloud includes a boresight alignment tool to achieve more accurate point clouds. This tool automatically aligns the LiDAR and INS reference frames using a proprietary algorithm analysing returns from two planar targets to find the precise alignment.
Save time, improve accuracy and reduce work-load
As well as saving time and reducing user work-load, the target-based system has been designed from the outset to be portable and simple to use in real-world applications. Two retro-reflective targets are arbitrarily placed on the ground (with no surveying required) and the vehicle is driven around these, during which time all the data required for boresight alignment is captured.