Take-off point altitude
Take-off altitude is the altitude above mean sea level that used by autopilot to calculate altitude. For Ardupilot it sets automatically after Home Point selection. For others it sets to altitude below Home Point when mission uploads to disarmed vehicle. In other cases, it can be set manually.
Note: it is highly recommended to always check altitude values. Altitude drift problems cannot be solved by software only and require operator attention. Always check, after power cycling a vehicle or mission upload, whether the altitude is reported correctly. UgCS tries to detect such conditions and issues a warning “It looks as if you have to power on/off your drone in order to reset barometer...” if RAW altitude reported by the vehicle is very different from 0 at the time of mission upload.
After setting the take-off altitude it is displayed in the vehicle card.