Companion Camera(s) EO File Generation

Some TrueView 3DIS systems accommodate a companion camera that is separate from the TrueView system but connected by an interface cable to facilitate capturing events from the companion camera. The workflow for processing the Exterior Orientation (EO) for processing the orthomosaic in LP360’s Ortho Mapping , or Agisoft Ortho Mapping tools, or a third party photogrammetric processing suite differs from the internal cameras of a TrueView or other system.

1. If utilizing one or more companion cameras, the images must be added to the cycle folder prior to starting the import process. For each companion camera and dataset, retrieve the photos from the flight and place them into the raw TrueView Cycle folder under Cycle_\Flight_\Camera11\, Cycle_\Flight_\Camera12\, and Cycle_\Flight_\Camera13\ for companion camera one, two and three, respectively.
2. Import the TrueView Cycle into LP360 using the normal workflow.
3. After the Create TV Trajectories step is complete make a copy of the EO file from the LP360 project path to a new location and open this file in a spreadsheet application for editing Project\Area_\Cycle_\Flight_\System\Companion_EO.csv

Note: The Project\Area_\Cycle_\Flight_\System\Companion_Timing.csv contains information about the event in UTC that may be useful for helping to align the correct photo to the correct event.

4. In the Companion_EO.csv note the first column for image name does not match the companion camera image names and will need to be updated. These events are tagged with the camera#_, i.e. 11_P, 12_N, and 13_S, when there is more than one companion camera. Also, note the sequential numbering of the photos does not start at one. Every image preceding the first image number will be disregarded as those images are not part of the trajectory solution and have no positional data. The first image number minus one will be the number of images from the image file list that need to be disregarded. Also, note the total number of rows in the file minus one (subtracting the column header) for your total EO file image count.
5. To correct the image file names, locate the folder of the companion camera images. Open a command prompt in that location by right-clicking an empty area and selecting Open in Terminal. Type the command below to generate a file list. dir /B > companion_images.txt Another method is to create a batch file. Save the above command to a text file named companion_image_list.bat, this file can be placed in the image folder and executed by double-clicking.
6. Open the companion_images.txt file, select the image names by excluding the number of photos to be disregarded from step 2, and ending with the last image of the file list. The total count of images file names should also match the total number EO file image count determined in step 2. Copy this selection.
7. Go back to the Companion_EO.csv file in Excel and paste the file list selection from the companion_images.txt into the %image column to replace with the proper image file names.
8. Now that the EO file has been updated, the original images can now be imported into LP360 using the Add Photo Layer tool on the Wingtra Tab or the Add Files -> Photo tab tool on the Project Tab, and the EO file used to Assign True Pose Tags. Once imported, the user can utilize the Ortho Mapping  or Agisoft Ortho Mapping tools within LP360. The EO file can also be used in third party photogrammetry software, if desired.