Hello everyone,
I am trying to understand the different  altitude-measurements/calculations from the flight record, does anybody  know the differences? I found 5 columns which have something to do with  height:

IMU_ATTI(0):press: D
IMU_ATTI(0):alti: D
IMUCalcs(0):height:C
GPS:heightMSL
osd_data:relativeHeight

When I plot them there are visibible differences (look attachment if this is too small).

        
     

What I know:
  IMU_ATTI(0):press: D   → the height derived from barometric pressure
  GPS:heightMSL            → the height above mean sea level.


I'm not sure how the other altitudes are being calculated and how exact  they are, respectively. if anybody knows, please let me know!


Greetings

Captn_Kex

Hello everyone,
I am trying to understand the different  altitude-measurements/calculations from the flight record, does anybody  know the differences? I found 5 columns which have something to do with  height:

IMU_ATTI(0):press: D
IMU_ATTI(0):alti: D
IMUCalcs(0):height:C
GPS:heightMSL
osd_data:relativeHeight

When I plot them there are visibible differences (look attachment if this is too small).

        
     

What I know:
  IMU_ATTI(0):press: D   → the height derived from barometric pressure
  GPS:heightMSL            → the height above mean sea level.


I'm not sure how the other altitudes are being calculated and how exact  they are, respectively. if anybody knows, please let me know!


Greetings

Captn_Kex