Question Regarding Altitud for Thermal Mapping Job

[fotonews]

Technical question...

So, I have the following info for a thermal mapping solar farm mission:
Ground Sample Distance (GSD): 5.5 cm per pixel panel level.
Front Overlap: 80%.
Side Overlap: 80%.
Image Resolution: 640x512 pixels.

I have input the following info into propelleraero.com:
Image Width px 640
Image Height px 512
Sensor Width mm 169.3
Sensor Height mm 135.5
Focal Length mm 40

Calculation result is to fly at 27.3 ft above ground to achieve 5.5 cm per pixel pane level.

Can someone be kind and confirm if right?

Thanks

 

[jaja6009]

Input the flight into DJI Pilot 2 and compare.