PCMaster Tutorial: Create the Point Cloud

The PCMaster Pre-Processing Software generates a calibrated point cloud.

PCMaster Pre-Processing Software Workflow

  1. Complete a flight with the R2A.
  2. Transfer the R2A data from the USB drive to your processing computer.
  3. Transfer the RINEX data from the RS2 to your processing computer.

R2A Project Folder and Files Contents

The files located in the project folder transferred from your USB data will contain the following:

  • data  folder - contains all the raw LiDAR data and photos
  • ppk PCMaster file - project file to start PCMaster 
  • ppk PCPainter file - project file to start PCPainter
  • service log - contains system log information

Base Station Files Contents

Copy the RINEX data folder from the RS2 into the same project folder.

  • NAV
  • OBS
  • Any RINEX format: .22o, .22n, .22g, .22l

Creating Your Point Cloud

1. Start PCMaster

  • Double click ppk PCMaster Project file
PCMaster will open a New Project and create several folders in the project folder:
  • camera - raw photos
  • ins - inertial and navigation data
  • lidar - point cloud data

2. Select Base Station file

A prompt "Base measurements file was not found" will appear.  Enter the base station file: 

  • Select the RINEX observation file (.22o)
  • PCMaster will now convert the raw RINEX data

3. Base Station Coordinate Reference System

Next, a prompt will appear for the base station coordinate

  • Latitude, Longitude - enter WGS84
  • Ellipsoid Height - Enter the height of the tripod plus the phase center offset

If you don't have the precise point of the base station, see Using OPUS to compute a precise point with the EMLID Reach RS2 for PCMaster

4. Click OK to Begin Processing GNSS Trajectory

You will see the following graphs while the GNSS Trajectory is processing. This information helps determine your final point cloud. See below for the information contained in each graph. 

Position Quality

  • The GNSS Position Quality graph above plots the East, North, and Vertical separation of the forward and reverse trajectories
  • It's normal to see a spike in separation during the takeoff and landing, everything will become fixed during the flight.

    Calculate Lever Arm

     

    • The IMU Antenna Lever Arm Refinement graph will run several times and it will appear thinner after each iteration, indicating an accurate level arm.

    Attitude Separation

    Processing tightly coupled UAV trajectory

    • The Forward/Reverse Attitude Separation graph  calculates the attitude separation for heading, pitch, and roll.

    5.  Point Cloud Creation

    • PCMaster will automatically begin to load the trajectory and lidar files and will populate the visualizer with the point cloud.

    To navigate the point cloud:

    • CTRL + Click and Drag - translate the point cloud
    • SHIFT  + Click and Drag - rotate the point cloud
    • CTRL + SHIFT + Click and Drag - raise or lower the point cloud

     

    6. Remove Flight Paths

    • Click Paths tab and then click Remove

     

    7. Select Flight Paths

    • Right-click at the blue end of the trajectory (after your flight calibration procedure) and select Start selection here

    Start Trajectory Selection

    • Right-click at the red end of the trajectory (at the end of your planned mission) and select Finish selection here

    End Trajectory Selection

    Your first selection will now look like this:

    First segment

    If you performed a battery swap during your mission, then you will need to select multiple start/stop points.

    Here is a selection demonstrating battery swapping mid-mission:

    All selected



    8. Create Your Final Point Cloud 

    • Click Produce LAS and save the project when asked.
    • PCMaster will create a clouds folders and save the point cloud.

    DO NOT rename the PointCloud after saving or it will not work with PCPainter.


    Select Produce LAS

     

    Step 9: Colorize your Point Cloud

    Use the navigation menu below to continue the tutorial.