Modularity is a key feature of the RANGER-FLEX laser mapping product line.

These systems can be quickly reconfigured, with sensors added and/or removed, to allow for optimized utilization on a variety of vehicle types. Modularity also presents a challenge: How can a system calibration, which is a cornerstone of data accuracy, be preserved if laser scanners and cameras are routinely separated from each other and from the navigation system? The RANGER-FLEX has been engineered to specifically address this, and a series of datasets were collected to test the stability of its calibration.

Phoenix LiDAR’s SpatialExplorer’s LiDARSnap strip alignment tool was tested using a challenging mobile LiDAR dataset collected along a rural state road, Natchez Trace Parkway, near Mathiston, Mississippi. Approximately 17.5 km of the parkway was mapped using the RANGER Flex dual-head mobile LiDAR mapping system.

Of the total mapped area, nearly 85% was covered by a dense tree canopy, which posed a significant accuracy challenge due to the limited availability of GNSS signals. LiDARSnap was utilized not only to calibrate the relative accuracy of the two passes but also to georeference the scan in relation to leveled control.

This paper discusses the processing workflow, results, and capabilities of LiDARSnap in challenging, GNSS-denied environments.

Speed: 20-30 mph
Point density: >2000 points/m²
AGL: Ground level
Acquisition time: 1.5 hrs

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