Altitude Above Mean Sea Level
Hi there,
I'm new to Dronelink. I'm attempting to create mission for a Mavic 3E RTK consisting of a series of waypoints where we need to shoot 180 panoramas at defined bearings. The customer has supplied specific coordinates (WGS84 in decimal degrees) and altitudes above sea level where the panoramas are to be taken. Is manually factoring the elevation at the take off location the only way to set the correct altitudes above sea level? Prior to take off get the elevation of takeoff location, subtract that from the customer provided altitudes and use those as ATL-relative altitudes?
Thank you!
Best,
Sal
Comments
4 comments
Yes, you need to subtract the MSL altitude of the takeoff location.
Thanks again Jim McAndrew.
In this specific application most of the potential take off locations are within a 126-131 ft range above MSL. Is it reasonable to set the Checkpoint altitudes relative to a 126ft ALT and then use Drone Offsets to dial-in the exact takeoff location elevation once on site?
You can use the altitude offset to make in-field adjustments, but you have to realize that the underlying sensor (barometric altimeter) can be off by as much as 4-5m during a flight so if you are looking for super high accuracy, this won’t be a good solution for you.
How does the fact we'd be flying an RTK drone with NTRIP corrections being applied play into all of this? Does Dronelink read the barometric altimeter exclusively? or does it read the RTK "Z" positioning?
DJI forum posts indicate that with RTK turned on, the drone uses WGS84 ellipsoid height and the DJI Pilot 2 app displays ASL altitude by doing a conversion to EGM96. How does Dronelink treat altitudes when RTK is on?
For additional context, our use case is for a luxury real estate development. The developer has contracted the services of an agency that will create 3D visualizations of the residences in the 15-story building. We’ve been tasked to take 180-panorama photos at specific coordinates and altitudes above mean sea level with specific bearings. The agency will use the panoramas in their 3D visualizations to offer potential customers the opportunity to explore the views from the different rooms in the residences. There are over 30 panoramas, we were hoping to automate the mission with a Mavic 3E RTK in order to get the precision the client is requesting.
Please sign in to leave a comment.