Thanks for making a DatuBIM trial. In this short guide, we share some best practices that will help you make a 3D model of your construction site, earthmoving environment, or inspection area. Let’s get started!
STEP 1: Before the Flight - Drone Equipment & Flight Settings
Recommended drone types are Phantom 4 RTK or Phantom 4 Pro V2
Overlap: 80% front overlap and 70% side overlap are recommended.
Height of flight: 200 feet (60 meters)
above ground. Maintain the same distance from the ground as much as possible
throughout the flight
Max velocity: 6 m/s (19 feet/s), recommended velocity: 4.5 m/s (15 feet/s).
STEP 2: In the Field - Ground Control Points (GCPs)
Measure the GCPs using professional surveying equipment in two sessions. Then use the average measurement for geo-referencing the model.
Spread GCP’s as evenly as possible in the site area
GPC Density: Place GCPS at every 400
feet (120 meters). If you use an RTK drone, have a GCP every 1000 feet (300
Make a drawing with GCP’s locations and names
Mark GCPs correctly on the ground and include the name of the GCP
The images below show the faulty and correct marking of a GCP
STEP 3: In the Office
3.1 Flight Info & Preferences in DatuBIM
If you used an RTK drone, please turn on “Images with RTK Data”.
Rolling shutter: This option appears only if the drone uses a rolling shutter camera (versus global). When the option is available, turn it on if you are not sure if the images were taken in motion or not.
4. The Geoid height on result
page gives you the undulation delta H value to enter into DatuBIM.
5. If the units of your site in DatuBIM
are in feet, you will need to convert the meters.
6. If you received a negative value in the
Geoid height, make sure to enter the value including the minus.
values mean that DatuBIM will elevate the site to the correct elevation.
values mean that DatuBIM will lower the site to the correct elevation.
3.2 GCPs Upload
Enter the GCPs to an Excel file in the format shown below. Note that other cells must be empty. Do not use any commas in the n, e, h cells – only values:
Make sure Northing (n) and Easting (e) values are correct and not flipped.
Save as a CSV file. Upload the CSV file to DatuBIM.
3.3 GCPs Marking and Model Generation
Follow the instructions of marking the GCPs in the images and check accuracy.
Once you are satisfied with the model’s accuracy, you can generate the model.
We hope you found this information helpful. For detailed instructions, please visit:
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