problems with Terrain Follow (AGL) missions (outdated model, small deviation and constant altitude above Take-Off Level)
We flew about one hundred Terrain Follow (AGL) missions spread across a single site.
13% missions lead to unusable results.
For some I found the pilot did not stick to the designated restricted take-off zones.
Does that directly lead to constant altitude above take-off level?
For other flight plans, the drone was following the terrain per se, but with a slight deviation of the set altitude above ground from what we expected. It was like the flight plan was shifted compared to the DEM, and therefore instead of 23 m above ground level we were between 20 and 26 m. Is this a common issue? I hear ESRI updates their model 3x a year. But there is no way to import an up-to-date model in dronelink, correct?
Comments
2 comments
No, it causes all the altitudes to be measured relative to the elevation of the takeoff point, which is why the mission planner prompts you to add a restricted takeoff zone to prevent this.
The barometric altimeters on DJI's drones are known to drift over time as much as +/- 4m.
Correct
thank you for the swift response. Very much appreciated.
Human factor created the struggle by not adhering to TOZ restriction... ;)
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