1. GUIDELINES FOR ACCURATE DATA ACQUISITION

Follow these guidelines to obtain a good 3D reconstruction:

• Perform a figure-8 movement as shown in chapter 5.

• Once acquisition starts, wait for a good GPS signal as shown in chapter 5. The GPS symbol should be at least green.
  To assist GPS fixing, with the application camera active, frame surrounding roads or buildings in the survey area.

• Start recording at least 5 meters before the beginning of the survey object/trench.

• Recordings must be taken with the phone held horizontally (landscape); its inclination must never be parallel to the ground.

  

  Incorrect acquisition: phone pointed directly at the ground

  

  Incorrect acquisition: phone pointed directly at the ground

• Throughout the entire acquisition process, frame both the survey object and the surrounding areas, holding the phone at a vertical tilt of approx. 30° and trying to stay centered relative to the trench to fully capture the side walls.

  

  Correct acquisition

  

  Correct acquisition

  

  Correct phone position

  Example of correct acquisition

• Maintain a constant, medium-slow walking pace during the entire acquisition phase.

• Keep the phone at the same angle, direction, and height throughout the entire acquisition process.

• Avoid sudden movements and try to maintain a straight path.

  If possible, using a gimbal is recommended to help stabilize the operator's movement.

• Avoid scanning moving people or objects. Ensure the scene is static before starting data acquisition.

• Do not backtrack; follow straight and linear paths.

• Avoid acquiring data under insufficient lighting conditions, such as:

  - Times of day with low light

  - Adverse weather conditions

  - Sudden light changes within the same recording

• Avoid framing your own shadow during acquisition.

  

• Never perform fan-shaped recordings (panning by spinning in place while holding the phone still), as shown in the image below:

  

• Always point the phone in the same direction.

• End the acquisition at least 5 meters past the end of the survey object/trench.

• Example of trajectories to follow:

  

2. INSTALLATION

• 3D4U-E APP INSTALLATION

  Install the application via the provided APK file or through another method specified by your IT systems administrator.

• PERMISSIONS

  Enable Location and Camera permissions upon the first launch of the 3D4U-E application.

  

• REMOVING AND UPDATING GOOGLE PLAY SERVICES FOR AR

  WARNING: Perform this procedure ONLY in case of application malfunctions. For example:
  - Consistently poor GPS signal
  - Application crashes
  - Camera freezing
  - Other abnormal behaviors

  • Uninstalling GOOGLE PLAY SERVICES FOR AR Updates

    If already installed on the mobile device, uninstall updates for "Google Play Services for AR" as shown in the video. They will be reinstalled during the first launch of the 3D4U-E application.

    • Open Settings

    • Apps

    • Search for "Google Play Services for AR"

    • Tap the three dots in the top right corner

    • Uninstall updates

  • Updating "GOOGLE PLAY SERVICES FOR AR"

    On the first launch of the 3D4U-E application, you will be prompted to update "Google Play Services for AR". Proceed with the update.

• SCREEN RESOLUTION

  Set the device screen resolution to FHD+ (2316x1080) [S22 ULTRA only].

  

3. LOGIN

• ACCESS

  Access to the application is performed via direct login within the app using the provided credentials.

  

  Following the first login, you will be required to set a new personal password.

  

  The password must satisfy the following criteria:

  • Contain at least 14 characters
  • Contain 3 character types among: uppercase letters, lowercase letters, numbers, special characters
  • NOT contain more than 2 consecutive identical characters
  • NOT contain references to your first or last name
  • Be different from any of the last 3 passwords used
  

  The password must be changed every 90 days. After this period, the password change procedure will automatically be prompted again.

  If an incorrect password is entered 4 times, the user account will be locked and login will not be possible until unlocked.

  

• ACCESS WITHOUT DATA CONNECTION

  The first login of the workday must be performed under mobile data/internet coverage.
  If after the first login you enter areas with weak or no internet connection, access will remain granted until the end of the day.

5. STARTING DATA ACQUISITION

• Wait a few seconds for the GPS indicator signal to turn Green or White.

  > > >
  

  While waiting, to facilitate GPS position fix:
  - Walk near the trench framing surrounding structures, buildings, and roads with the camera;
  - Perform a figure-8 motion as shown in the video below.

  Position the phone horizontally to start acquisition.

• The total number of acquired images is shown at the top. The counter increasing indicates active recording.

  

6. QUALITY CONTROL

Upon completing data acquisition, quality checks are performed on the newly completed survey.

The user is prompted to review the captured point cloud.

Using pinch-to-zoom (2 fingers) and panning, verify that the point cloud covers the entire area of interest.

Using the button, you can inspect the photo gallery of captured images.

Perform the following checks on the images:

• - Ensure proper lighting conditions
• - Ensure photos are not pointing directly at the ground
• - Ensure no obstructive elements were blocking the lens when shot

Tap the Back button to return to the point cloud view.

After performing these manual checks, tap Next to view the automated Quality Check results generated by the application:

Approve the Quality Check to save the project/LCL session and return to Main View, or Reject to discard the recording and repeat it.

7. SERVER UPLOAD

AUTOMATIC UPLOAD

The application checks for new surveys to send to the server across 3 daily time windows:

- 06:00 / 08:00

- 12:00 / 14:00

- 17:00 / 19:00

If pending surveys are found, and the user has sufficient network coverage and adequate remaining battery level, the app will execute an automatic upload.

MANUAL UPLOAD

From the Main View, tap the button to view the list of acquisitions stored on the device for the selected project.

Tapping the three dots button ( ) next to a session name opens the context menu:

Tap Upload to upload the survey data to the server.

Once completed, the icon confirms successful upload.

Tap Photos to access the image gallery for that survey session.

The last image in the gallery contains a screenshot of the Quality Check approved during acquisition, allowing consultation at any time.

If attempting to upload a survey that failed Quality Check, a confirmation dialog will be displayed to the user.

Uploads can also be initiated from the project list filtered by "PROJECTS WITH DATA TO UPLOAD" as shown in chapter 3.

WARNING:

Before uploading, ensure you have a stable Wi-Fi or mobile data connection.

CHANGE STATUS

For line surveys, tap Change status to modify the survey status.

You will be presented with input fields and options relevant to the newly selected status.

As an example, changing line status from "open trench with piping" to "open trench" is shown below: