The DroneDeploy Map Engine uses a computer vision system to align new maps with previously processed maps of the same location. This system facilitates easy comparison, change detection, project overlays and volumetric measurements.
Overview
DroneDeploy compares features of a new map with features from a previous map. If the maps are similar—meaning most of the scene remains unchanged—the system computes a transformation to align the new map with the previous one. This ensures your maps align with each other even without the use of Ground Control Points (GCPs).
If you use GCPs, RTK or PPK on one map, future maps of the same site gain the benefits of that ground control automatically. This process saves time by reducing the need to manage ground control on every flight.
Availability: Who has access?
Automatic map alignment is a standard feature of the DroneDeploy Map Engine. It applies to all account types processing standard drone map data.
How map alignment works
Map alignment is necessary because standard GPS data may be inaccurate by several meters. Maps of the same location captured on different days might not perfectly align in 3D space without this technology.
The system routinely attempts to align each map provided a map of that location exists in the project. The engine searches for the most recent map with sufficient overlap, reviewing up to 5 previous maps.
Checking alignment status
To see which map your latest data aligned to, follow these steps:
Open your project in DroneDeploy.
Click the > button next to Map.
Read the date listed beneath Aligned with map from.
Best practices
To ensure successful alignment when flying a single site repeatedly, follow these guidelines:
Use the same flight plan for each mapping session.
Maintain consistent overlap, altitude and waypoints.
Calibrate the drone IMU and compass regularly.
Use the same drone when uploading multiple image sets for a single map to avoid discrepancies.
Accuracy considerations
While map alignment offers benefits similar to GCPs and RTK, do not rely on it solely for high-accuracy measurements. The only way to confirm map accuracy is by using Checkpoints.
General Use: Use map alignment to keep orthomosaics and elevation models aligned over time for identifying changes.
High Accuracy: Use GCPs or RTK alongside Checkpoints when significant financial decisions depend on the data. Consult a surveyor to ensure measurements meet ASPRS 2015 standards.
Limitations
The system does not apply map alignment in the following scenarios:
Live Maps
Maps with minimal overlap
Maps using controlled data such as GCP, PPK or RTK
Thermal maps
Maps flown at significantly different altitudes
Opt-out process
If you prefer not to use map alignment technology, contact the Support team at support@dronedeploy.com.
FAQs
Q: My alignment looks close, but not exact. What is wrong?
A: Check that the camera is set to Orthographic and the view is perfectly top-down with the View Cube reading “Top”.
Q: My alignment drifts after I press the Home button. How do I fix this?
A: Switch the camera back to Orthographic and re-enter a true top-down view before placing your points.
v2.2