179 articles Terrasolid Tools, Tips and Workflows

Photogrammetric Point Cloud Processing

Point Clouds generated through photogrammetric methods (such as Dense Image Mapping) have different characteristics than traditional airborne laser scanner systems or “normal” LIDAR point clouds.  Specifically, the data is very dense, which can negativity impact processing time, and the data is also very noisy, which can cause the normal classification routines to err. The echo…

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New lines in .prj file

TerraScan project files (.prj) store information pertaining to the data, organization, and use of point cloud data to allow for the efficient management of projects. This can include information such as: types of scanner, point format, time-stamp format, block size. Beginning with TerraScan for CE v017, some new types of information can be stored in…

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Group Classification Tools Enable New Analysis Methods in TerraScan

Beginning in 2017, additional grouping tools were introduced to enable new methods of conducting above ground classifications, beyond the usual classification routines.  These tools rely on group logic – grouping above ground points with probable relationships with the goal of designating a single group of points per physical object. In short, the usual classification routines…

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Synchronize Views: Camera Options

TerraScan provides from the ability to synchronize MicroStation views by making one view dependent on a master view.  The dependent view then updates when the master view changes.  One advantage of this tool is that it allows the visualization of the same location using different attributes simultaneously, which can be extremely useful for quality assurance/quality…

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Classifying by Groups in TerraScan

Beginning in 2014, some grouping tools were introduced to TerraScan.  Those tools applied to mobile LIDAR applications as they were aimed at classifying moving cars and trees. In late 2016, additional grouping tools were introduced to enable a new method of conducting above ground classifications in airborne LIDAR datasets beyond the standard classification routines.  Prior…

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Edit Several Blocks

It is possible to edit the definition of multiple blocks in a project simultaneously. In the Project Window, simply select multiple blocks and selected ‘Edit definition’ for the ‘Block’ drop down menu. When more than one block is selected then the ‘Edit definition’ tool becomes an ‘Edit several blocks’ tool that can be used to change…

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Terrasolid Design Library

The Terrasolid design library is provided as an example of some of the customization that can be done in MicroStation CONNECT edition to make working with the Terrasolid products easier and more efficient, particularly for new users. We recommend the provided Terrasolid.DGNLIB remains as provided so that you can easily download the latest from this…

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Loss of VLR information by TerraScan

With the release of TerraScan v017.001 for CE, TerraScan should now be preserving the projection VLR information in the LAS header. However, when processing with TerraScan, either directly or indirectly through GeoCue, there are some scenarios in which VLRs can be stripped from your data, or at least appear to be removed. Scenario 1: Reading…

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Tie Line Statistics in TerraMatch

Terrasolid products provide statistical information about the fit of LIDAR and imagery data. This article is the second in a series that provides meaning to this type of information. We will conduct a brief review of the relevant statistics and discuss how these principles are applied to the use of tie lines for laser calibration.…

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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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