Create Editable Model

The Create Editable Model tool in TerraScan creates a surface model from loaded points, and uses TerraModeler to visualize it. The purpose of this tool is to assist in the quality checking and editing the classification of points that it represents (i.e. ground points). This shaded surface allows the easy visualization of the surface and…

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Generating Low Confidence Polygons

In the new ASPRS Positional Accuracy Standards for Digital Geospatial Data, low confidence areas within LIDAR data are defined to be where the bare earth model might not meet the overall data accuracy requirements. Generally speaking with LIDAR data this can occur where there is heavy vegetation that causes poor penetration of the pulses. If…

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Breaklines should Undergo QA/QC

As with any data, breaklines should undergo a QA/QC process. For breaklines this should entail a check for potential topology errors as well as incorrect elevation values. Since breaklines are used to define and control surface behavior in terms of smoothness and continuity they may have a significant effect when incorporated in a surface model.

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Control Point Comparison QA-QC Analysis

An important evaluation to make when performing a QAQC analysis of a LIDAR data set is a control point comparison. When discussing control points and LIDAR data, there are typically two types of points that need to be considered independently. Control Points: The monuments or markers used to control the LIDAR collection or validation point…

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