True View Data in TerraScan

Processing in True View EVO is purposely designed to create LAS and trajectory files formatted to easily setup a TerraScan project for further processing using Terrasolid products, such as TerraScan for above ground feature classification and analysis, reporting of trees, TerraMatch workflows, etc. Follow this quick guide for a suggested workflow on how to setup your True View data in TerraScan.

Create a CAD File

The initial user operation for setting up a TerraScan project is creating a CAD (Spatix or DGN) file. To start, open MicroStation or Spatix software and choose to create a new file. The user can reference templates in \terra64\seed or use their desired seed file from a different location. Name and create the CAD file in the desired location.

Create a TerraScan project from True View data

Select Define Project and choose “New Project” in the “File” dropdown:

TerraScan – Creating new project

Choose the description of the project and set the storage format to LAS v1.4. Select the attributes that correspond with the data generated by EVO. This should always include Color and the Timestamp format as “GPS Standard time”. If the LAS data is from a TV600 series, also select Amplitude, Reflectance, and Deviation. If the LAS data is a photogrammetric point cloud, aka Dense Image Matching (DIM), produced by MfE, then select Reliability. Select OK and save the project.

TerraScan – Define project

Add Files to the TerraScan project for all cycles flown using Block -> Add using files….., then save the project (File -> Save project). The default True View LAS file location is Project\Area_\CycleYYMMDD__HHMMSS_XXXXX\Flight_YYMMDD_HHMMSS\LAS for each Cycle in the project. You may also right-click on your LAS layer in EVO and export a copy of the LAS data to your desired location for your Terrasolid processing.

Create your TerraScan project by using the Add using files option and browsing to your True View EVO generated LAS files.
TerraScan – Block – Add using files…

If desired, draw the boundaries into the CAD file (Block -> Draw boundaries…) and center your project on the extents.

TerraScan – Project dialog – Draw boundaries into design function

Adding Trajectories

Select Manage Trajectories and set the directory (Manage Trajectories -> File -> Set directory). If using multiple cycles, make sure to manually combine the trajectories for all Cycles by copying them into a single folder. The True View Trajectories are located in the Project\Area_\CycleYYMMDD__HHMMSS_XXXXX\Flight_YYMMDD_HHMMSS\Trajectories folder for each Cycle in your project.

A couple of things to keep in mind:

  • Ensure the Point Source ID was set to unique values for each flight line in True View Evo processing so that the trajectories value is unique and matching for each one. This is reviewed in the Creating Flight Lines and True View Trajectories section of the True View Evo Users Guide, where it is suggested to use a nomenclature, such as CCCFF, where CCC is the Cycle number, 1-645, and FF is the flight line per Cycle, 1-99, to keep the point source IDs unique within the project.
  • Ensure your TerraScan scanner systems configuration file contains the proper values for your True View 3DIS data.
Set the directory in Manage Trajectories to read the True View generated TerraScan trajectories.
TerraScan – Manage trajectories dialog

To visualize that the trajectories match up with project boundaries and LAS data, draw them into the CAD file (Tools -> Draw into design…), then use open a block of data (TScan -> File -> Open Block), and color by Flightline (TScan -> View -> Display Mode) to verify.

TerraScan – Manage Trajectories dialog – Draw into design function
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