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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Spatial Density Distribution

Quality control and quality assurance checks for LIDAR data continue to evolve as the industry identifies new ways to help ensure that data collections meet desired usage requirements. The U.S. Geological Survey (USGS) LIDAR Base Specification introduced a definition for spatial density distribution and regularity within LIDAR data. The requirement is that the spatial distribution…

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Breaklines, Part 2 – Contours

In the previous issue of LP360 News, I introduced the use of Triangulated Irregular Networks (TIN) for modeling point derived elevation data as well as the basic concepts of “soft” breaklines. I realized when writing that first article that it is probably a useful exercise to review contours. Thus this part II article will be…

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Pierce County WA LIDAR Acquisition and Quality Control Procedures using LP360

Pierce County, Washington has used LIDAR data since 2004 as a mission critical component of the County’s Geographic Information System (GIS). The data, collected from 2000 to 2004, has been used for a variety of purposes, including economic development, environmental planning, construction and transportation projects, and emergency management. However, this data was collected with older…

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