Understanding Elevation Data
Elevation maps within DroneDeploy are created using standard geo-referenced information embedded in your drone imagery. The elevation data displayed is the absolute elevation in WGS 84.
However, the elevation data from the drone can have some errors due to the error in the drone's GPS and variations in barometric pressure, which DJI also uses to assess altitude. To correct this error or to view your elevation data in a different ellipsoid, you can use Elevation Calibration to enter the known elevation at a point to correct the elevations within your map. Continue reading this doc to learn how.
Calibrate Elevation Data within DroneDeploy
In this tutorial, we'll be looking at the Example Data from the How to Process Datasets documentation.
- To start, click on the Map Details button on the side panel.
- Then, select
Calibrateunder the Map Tools section.
- Drag the calibration icon to a point on the map where you know the elevation. This could be a GCP marker, take-off point, or another recognizable point/feature on the map for which you know the elevation.
- Finally, enter the known elevation of the point in the
custom elevationbar, and click Calibrate.
You'll see a confirmation message at the bottom of the screen confirming that the elevation map has been updated.
All elevation data associated with the map will be adjusted using the difference between the default elevation and the entered calibration elevation of that specific point. The results would be reflected in the elevation histograms, elevation visualizations, measurements, and exports.
Remove the Calibration
To remove the calibration and return to the default elevation values relative to the drone's takeoff point, click on the trashcan icon next.
A confirmation message will show up confirming that your elevation calibration has been removed.
Enjoy your calibrated elevation map!