Setting the USGS Overage Flags in TerraScan

Introduction For many years users have been working with the concept of ‘cutting overlap’ in LIDAR data production. With the onset of LAS v1.4 and the USGS LIDAR Base Specification, the way in which this concept is implemented has significantly changed.  Specifically, USGS standards require a change in the way overlap points are managed and…

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Using Classification Flags in TerraScan

The classification of a LIDAR data point consists of both a classification and a classification flag. The classification flag allows for a point to be simultaneously flagged for particular uses while maintaining the classification of the point. For example, a model key-point can be flagged as such while maintaining the ground classification. Classification flags are…

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Analyze Relative accuracy between flight lines with the Seamline Analysis tool

The recently published United States Geological Survey National Geospatial Program’s LIDAR Base Specification Version 1.01 specifies that the “requirements for relative accuracy within overlap between adjacent swaths of data should be less than or equal to 10 cm RMSEz”. In version 2011.1, LP360 introduced a new tool which allows for the ability to check the…

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